Influence Of Operating Parameters Research Articles

Experimental study on heat transfer in a model of submerged combustion vaporizer

• Heat transfer experiment of submerged combustion vaporizer (SCV) model is conducted. • The shell-side, tube-side and overall heat transfer coefficients are obtained. • The average of shell-side heat transfer coefficient is about 300 W/(m 2 ·°C). • Two simple empirical correlations are developed for the overall tube-side heat transfer. The submerged combustion vaporizer (SCV) is widely used in the peak shaving of liquefied natural gas (LNG) supply. It is believed that SCV will have a great application prospect with the implementation of the peak-shaving policy of natural gas in China. SCV injects the flue gas after combustion directly into the water bath from its bottom, causing gas disturbance and two-phase flow in the water bath. The shell-side flow and heat transfer become unclear because of the gas disturbance. There is a lack of relevant theoretical basis in this regard. In order to master the operation mechanism of SCV, an experimental research is carried out on a SCV model which has the same structure and function as the actual small-size SCV. The shell-side, tube-side and overall heat transfer coefficients are obtained, and the influences of operation parameters on the heat transfer are investigated. The results indicate that in the range of the experimental parameters, the shell-side heat transfer coefficient is almost not affected by the frontal gas velocity and Reynolds number of the flue gas at orifices, and the average value is about 300 W/(m 2 ·°C). Meanwhile, the higher the flow rate and pressure of the tube-side medium, the greater the overall heat transfer coefficient. In addition, it is observed that if the gas disturbance stops, the heat transfer deterioration will occur. Finally, two simple empirical correlations are developed for the overall tube-side heat transfer. This study provides support for the design and application of SCV.

Design and Testing of a Commercial Prototype Press to Extract the Juice from Sweet Sorghum Biomass

HighlightsA commercial-scale prototype press to extract the juice from sweet sorghum biomass was designed, built, and tested.Extraction rates of up to 45% were obtained with this prototype.Abstract. With the rising concerns related to climate change issues, different alternatives have been explored to reduce the use of fossil fuels. Laws forcing the use of ethanol at gas pumps have been enforced across North America. While ethanol is a good alternative, it is mainly made from corn, which is a very demanding crop in terms of water, fertilizers, and climate conditions. The sweet sorghum has been proved to be a good alternative crop, but current pressing methods require transportation of the biomass to a plant, thus resulting in high transportation costs and emissions as well as depriving the soil from an important source of fertilization, which is the pressing residue. The objective of this research was to develop and test a commercial scale prototype press able to extract juice from the sweet sorghum directly in the field. A sequential two-chamber piston press able to apply up to 1.6 MPa of pressure on the biomass was developed and tested. The prototype press was used in extracting juice from sweet sorghum and the influence of operational parameters (pressure and extraction time) on the extraction rate and juice yield was evaluated. Sweet sorghum plants were first harvested and chopped with a forage harvester, then weighed and pressed. The pressing juice was collected and the residue (bagasse) was returned to the field as fertilizer. Obtained results from pressing tests carried out in 2014, 2015, and 2018 showed a juice extraction rate of up to 45% of the initial weight of the biomass. Keywords: Bioethanol, Biomass, Ethanol, Juice, Pressing, Sweet sorghum.

Efficient degradation of metronidazole with dual-cathode of acetylene black-PTFE/CoFe2O4-PTFE coupling persulfate

• The Electro-Fenton and persulfate were combined to degrade metronidazole. • The CoFe 2 O 4 -PTFE electrode was used in parallel with the acetylene black-PTFE electrode. • The removal rate of metronidazole reached 90.6% by ABP/CFOP/PS system after 120 min. • The catalyst exhibited good stability and recyclability for five consecutive cycles. • The intermediates and possible degradation pathways of metronidazole were provided. A composite electrochemical oxidation system combined with Electro-Fenton and persulfate (PS) was proposed to degrade metronidazole. The CoFe 2 O 4 -PTFE (CFOP) electrode was used in parallel with the acetylene black-PTFE electrode (ABP) as the dual-cathode of Electro-Fenton. Then the Electro-Fenton was coupled with PS to degrade metronidazole in wastewater synergistically. The self-produce of H 2 O 2 , in-situ circulation of Co(II)/ Co(III) and Fe(III)/ Fe(II), and activation of persulfate were simultaneously conducted. After 120 min, the removal rate of metronidazole reached 90.6% by ABP/CFOP/PS system. The influence of operation parameters (dosage of PS, initial pH, current density, temperature) on the removal of metronidazole was analyzed. The catalyst exhibited good stability and recyclability for five consecutive cycles. The radical quenching and EPR tests reveal that both OH and SO 4 − · are identified responsible for the degradation of metronidazole. The possible decomposition pathway of metronidazole was proposed by HPLC-MS analysis. The toxicity analysis indicates that heterogeneous Electro-Fenton could reduce the toxicity of metronidazole.

Evaluating the Influence of Operational Parameters of Pulsed Light on Wine Related Yeasts: Focus on Inter- and Intra-Specific Variability Sensitivity

Evaluating the Influence of Operational Parameters of Pulsed Light on Wine Related Yeasts: Focus on Inter- and Intra-Specific Variability Sensitivity

Multiple hydraulic fractures growth from a highly deviated well: A XFEM study

A fully coupled extended finite element (XFEM) model is presented to investigate the effect of different well types (highly deviated and horizontal wells) on simultaneous growth of multiple fractures. The importance of the use of deviated wells is briefly described and the governing equations for multi-cluster hydraulic fracturing in a saturated porous media are stated. The weak forms of both stress equilibrium and fluid mass continuity equations are turned into a system of linear equations through XFEM-type enrichments in space and Newmark scheme in time, which are solved by Newton-Raphson iteration method. In addition, the secant method is employed to impose the pressure continuity and mass conservation conditions at the fracture-well intersections. A numerical example with considering the simultaneous propagation of four hydraulic fractures is first adopted to validate the proposed numerical model. Several examples are then employed to investigate the influence of operational parameter, deviation angle, fracture spacing, placement and number on final fracture patterns. Numerical results show that coefficient of variation in multiple fracture heights for high-angle well is lower than that for horizontal well for all fracture placements. The opposite growth directions for two neighboring fractures, partially arising from the height difference at fracture-well intersection points, can reduce the stress shadow effect, thus promoting uniform growth of multiple fractures. Those results potentially unveil the causes for higher oil and gas production rates measured after multi-cluster hydraulic fracturing along highly deviated wells.

Influence of the Number of Dimensions in the Impedance Spectroscopy Simulation of a YSZ Electrolyte

The use of computer simulation to predict the behavior of devices and materials allows for the acceleration of system operation and reduces costs, as it eliminates the need to build prototypes for testing. This work proposes the construction of 3 models with different complexities to simulate the electrical behavior of a solid electrolyte fuel cell. Experimental data were compared with simulation data. The experimental data were obtained from the production of a solid YSZ by tape casting, sintered at 1550 °C. The material was characterized using impedance spectroscopy in atmospheric air. From the experimental data, a computer simulation was conducted by using commercial code (COMSOL Multiphysics v.5.4). The construction of the model was developed to 1D, 2D axisymmetric and 3D dimensions to simulate an electrolyte to use in cylindrical planar SOFC. Nyquist Impedance graphics were plotted for the three geometries in comparison with the experimental value. No variation was observed between the curves obtained by the different geometries for the same interface. In other words, the interface complexity did not interfere in the result obtained for the same experimental data. We concluded that the 1D model is ideal to predict the influence of operational parameters because it is simpler and saves analysis time, maintaining the reliability and accuracy of the results.

Influence of Operating Parameters on Photocatalytic Oxidation of 2,4-Dichlorofenol in Aqueous Solution by TiO2/Stainless Steel Photocatalytic Membrane

The influence of some operating parameters of an UV photocatalytic reactor with TiO2/stainless steel photocatalytic membrane on the photocatalytic oxidation of 2,4-dichlorophenol from aqueous solutions was studied in this paper. It was shown that the pH of the working solution substantially influences the photocatalytic degradation of the organic substrate, with the degradation efficiency increasing with decreasing the pH of the working solution by a maximum corresponding to pH 3. The rate constant of the photocatalytic oxidation process is about twice as high at pH 3 comparative with pH 7 for the same initial concentration of the organic substrate. The molar ratio of hydrogen peroxide/organic substrate also influences the photocatalytic oxidation process of the organic substrate. The results obtained in this paper highlight the fact that a stoichiometric molar ratio is favorable for the photocatalytic degradation of 2,4-dichlorophenol. It has also been shown that the initial concentration of the organic substrate influences the rate of photocatalytic degradation. It appears that the rate of photocatalytic degradation decreases with the increasing of initial concentration of 2,4-dichlorophenol.

Computer-aided design of graphene and 2D materials synthesis via magnetic inductive heating of 11 transition metals

We performed numerical simulations to determine the effect of the most influential operating parameters on the performance of a radio frequency (RF) induction-heating system in which RF magnetic fields inductively heat metal foils to grow graphene. The thermal efficiency of the system depends on the geometry as well as on the materials’ electrical conductivity and skin depth. The process is simulated under specific graphene and two-dimensional (2D) materials growth conditions using finite elements software in order to predict the transient temperature and magnetic field distribution during standard graphene and 2D materials growth conditions. The proposed model considers different coil Helmholtz-like geometries and 11 metal foils, including Ag, Au, Cu, Ni, Co, Pd, Pt, Rh, Ir, Mo, and W. In each case, an optimal window of process variables ensuring a temperature range of 1035 °C–1084 °C or 700 °C–750 °C suitable for graphene and MoS2 growth, respectively, was found. Temperature gradients calculated from the simulated profiles between the edge and the center of the substrate showed a thermal uniformity of less than ∼2% for coinage metals like Au, Ag, and Cu and up to 7% for Pd. Model validation was performed for graphene growth on copper. Due to its limited heat conductivity, good heating uniformity was obtained. As a consequence, full coverage of monolayer graphene on copper with few defects and a grain domain size of ∼2 µm was obtained. The substrate temperature reached ∼1035 °C from ambient after only ∼90 s, in excellent agreement with model predictions. This allows for improved process efficiency in terms of fast, localized, homogeneous, and precise heating with energy saving. Due to these advantages, inductive heating has great potential for large-scale and rapid manufacturing of graphene and 2D materials.

Efficient photocatalytic degradation of metronidazole from aqueous solutions using Co/g-C3N4/Fe3O4 nanocomposite under visible light irradiation.

Herein, the efficient degradation of a highly consumed antibiotic known as metronidazole (MNZ) in aqueous solutions using Co/g-C3N4/Fe3O4 nanocomposite under visible light irradiation was accomplished. Initially, the photocatalyst (Co/g-C3N4/Fe3O4) was synthesized by a simple hydrothermal method and then characterized by several analytical techniques, namely EDS, SEM, XRD, UV-vis DRS, and FTIR. The efficiency of the synthesized photocatalyst with regard to the degradation of the studied antibiotic (MNZ) under visible light irradiation was fully evaluated. The influential operational parameters affecting the efficiency of the degradation process such as pH (2-10), nanocomposite dosage (0.2-1g/L), MNZ concentration (5-20mg/L), and irradiation time (0-80min) were optimized. The results revealed that the maximum degradation efficiency for MNZ was obtained under the following conditions: irradiation time of 60min, pH = 8, MNZ concentration of 5mg/L, and photocatalyst dosage of 0.7g/L. In addition, the degradation of MNZ followed the pseudo-first-order kinetic model. The best rate constant (k) value was determined to be 0.0102min-1 with the correlation coefficient (R2) of 0.992. According to the results of the quenching tests, it was found out that hydroxyl radicals (OH°) were the main species responsible for the MNZ degradation. Furthermore, the applied photocatalyst (Co/g-C3N4/Fe3O4) exhibited a high level of recovery and stability after five cycles of reuse. Co/g-C3N4/Fe3O4/Vis system exhibited an excellent performance in the treatment of wastewater and real water samples. Finally, it was concluded that the synthesized nanocomposite could be potentially used as a promising and suitable photocatalyst in the degradation of other antibiotics.

Novel Liquid Chitosan-Based Biocoagulant for Treatment Optimization of Fish Processing Wastewater from a Moroccan Plant

A novel liquid chitosan-based biocoagulant for treating wastewater from a Moroccan fish processing plant was successfully prepared from shrimp shells (Parapenaeus longirostris), the most abundant fish by-products in the country. The shells were characterized using scanning electron microscopy, energy-dispersive X-ray spectroscopy, X-ray diffraction, and Fourier transforms infrared spectroscopy. Using chitosan without adding acetic acid helps to minimize its negative impact on the environment. At the same time, the recovery of marine shellfish represents a promising solution for the management of solid fish waste. In order to test the treatment efficiency of the biocoagulant developed, a qualitative characterization of these effluents was carried out beforehand. The optimization process was conducted in two steps: jar-test experiments and modeling of the experimental results. The first step covered the preliminary assessment to identify the most influential operational parameters (experimental conditions), whereas the second step concerned the study of the effects of three significant operational parameters and their interactions using a Box–Behnken experimental design. The variables involved were the concentration of coagulant (X1), the initial pH (X2), and the temperature (X3) of the wastewater samples, while the responses were the removal rates of turbidity (Y1) and BOD5 (Y2). The regression models and response surface contour plots revealed that chitosan as a liquid biocoagulant was effective in removing turbidity (98%) and BOD5 (53%) during the treatment. The optimal experimental conditions were found to be an alkaline media (pH = 10.5) and a biocoagulant dose of 5.5 mL in 0.5 L of fish processing wastewater maintained at 20 °C.

Numerical investigation on fatigue life of aluminum brazing structure with fin-plate-side bar under the low temperature thermal-structure cyclic stress

A stress analysis model was established to analyze the thermal and structural stress of aluminum brazing structure with fin-plate-side bar (ABS) in the LNG plate-fin heat exchanger. The fatigue life of ABS was evaluated based on the above stress analysis results by the different standard. The result shows that the thermal and structural stress concentration is generated at the brazed joint of ABS. Under the common action of thermal and structural stress, the equivalent stress is influenced mainly by the equivalent thermal stress. The equivalent alternating stress was calculated to be 153.5 MPa based on thermal and structural stress. The permissible cycle numbers at the brazed joint of ABS, which is calculated by the fatigue assessment procedure of ASME and JB4732, are 3311 and 2953, respectively. The fatigue assessment results based on the third strength theory is more conservative for the ABS. The influence of operation parameters is also analyzed for the fatigue life of ABS. The temperature difference between NG and MR, MR temperature and NG pressure will be the main factors to impact the fatigue life of that. And a method is proposed to predict the fatigue life of ABS according to the main factors. The error will be less than 10% between the prediction results and the simulation results.

Transition metals doped WO3 photocatalyst towards high efficiency decolourization of azo dye

Tungsten oxide semiconductor (WO3) modified using transition metals (Ni, Fe, and Zn) was synthesized via microwave-assisted solution combustion method. Ni, Fe, and Zn were doped in the WO3 structure to improve the photocatalytic efficiency. The prepared powders were characterized by X-ray diffraction, scanning electron microscopy, and energy-dispersive X-ray spectroscopy analysis to investigate products' structural and morphological properties and surface composition. The materials show a monoclinic structure of WO3 with small shifts in the peak position for each catalyst. Reactive blue 194 (RB 194) aquatic solution was used for photodegradation experiments under UV irradiation to evaluate the photocatalytic properties. The results showed an improvement in photocatalytic activity of host structure within doping the iron and nickel, whereas adding zinc made a decline in decolorization efficiency of WO3. The photocatalytic performance of samples is in the order of WO3:Ni > WO3:Fe > WO3 > WO3:Zn. The influences of operational parameters were evaluated for each catalyst to obtain the optimum conditions of the photocatalytic reaction.

Experimental and numerical evaluation of a two-stage indirect/thermoelectric assisted direct evaporative cooling system

The performance of a novel two-stage indirect/thermoelectric assisted direct evaporative cooling (i.e. IEC/TDEC) system is studied by using experimental and numerical simulation methods. In the IEC/TDEC system, the outdoor air is firstly pre-cooled in the first stage cross-flow regenerative IEC to make full use of the nature cooling source, and then further cools down in the second stage TDEC. An experimental set up is designed and built to investigate the influences of main operation parameters (i.e. operating current and number of TEC modules, inlet temperature, humidity and velocity of primary air, the mass flow rate ratio of regenerative air to primary air in the IEC, and also the mass flow rate of cooling water in the TDEC) on the system performance. It is found that the outlet air temperature and relative humidity could be conditioned to meet the comfort demand by adjusting the influential operating parameters. The dew point efficiency could be higher than unity, and the air moisture content increases or decreases dependent on given working conditions. The numerical model of the IEC/TDEC system is established, and validated by comparing with experimental results. The numerical results agree well with experimental results with relative errors within ±10%. Then, the working parameters of TEC modules and several mass flow rate allocation ratios of air are optimized theoretically by using the numerical model. Analytical results show that in the premise of a certain dew point efficiency, a maximum coefficient of performance can be obtained by adjusting the operating current and number of TEC modules. Moreover, the inlet velocity of primary air and two main mass flow rate allocation ratios of air can be optimized to achieve higher system performance.

Structured NSR-SCR hybrid catalytic technology: Influence of operational parameters on deNOx activity

An intermediate approximation using structured reactors between the study of deNOx catalysts at laboratory scale and in motor bench has been addressed. The hybrid NSR (NOx Storage and Reduction) and SCR (Selective Catalytic Reduction) technology has been analyzed for Pt-Ba-K/Al2O3 and Cu-SAPO-34 catalysts structured in monolithic form. In order to analyze the influence of the way of driving on deNOx efficiency, operational parameters such as NO inlet concentration, space velocity in terms of total flow rate, temperature, and the concentration of reductant agent, using H2 and C3H6, have been modified. The coupled NSR-SCR configuration is more efficient than the single NSR alternative, since the former used the ammonia produced in NSR monolith to reduce the non-adsorbed NOx through the SCR process over the system placed downstream. However, NH3 production depended on NO concentration, temperature, and reductant agent content in the process, limiting the promoting effect at high temperatures and NO concentrations, and low hydrogen concentration. N2 selectivity increased when temperature increased, and NO concentration and hydrogen content decreased. On the other hand, NOx to N2 reduction efficiency of the combined NSR-SCR system was not affected by variations in space velocity, with a maximum range studied up to 90,000 h−1. Based on these results, the location of the catalytic system should be adjusted in order to work in the 250–350 °C temperature range, where conversion and N2 selectivity values were around 70% and 95%, respectively. On the other hand, the hydrogen concentration of 2% and 3% can be suitable for the efficient operation of the system, since as reductant agent increased the ammonia formation and the surface regeneration also increased. The substitution of H2 by propylene as reducing agent caused a decrease in the amount of ammonia produced in the NSR configuration, which limits the improvement of deNOx activity of the double NSR-SCR configuration, and overproduces CO2, CO and N2O through parallel reactions as reverse water gas shift or C3H6 oxidation, which could poison the system and require emission control through other technologies.

Use of Discrete Element Modelling to Evaluate the Parameters of the Sampling Theory in the Feed Grade Sampler of a Sulphide Gold Plant

Cross-stream cutters are widely used in the mining and resources industry to obtain representative samples of particulate flows. Discrete element modelling (DEM) and analysis can be used to investigate influences of operational parameters, sampler design and material physical properties in the generation of the Increment Extraction Error (IEE), which when present, results in a frequently biased, non-representative sample. The study investigates the practicality of the rules and recommendations proposed by Dr. Pierre Gy that were developed and established as principles for the correct extraction of samples in industrial sampling equipment. Results validate Pierre Gy’s sampling theory using DEM in a cross-stream cutter of a sulphide gold plant. Importantly, the outcomes indicate that careful consideration must be given to physical ore properties and, consequently, that sampling systems should be developed specifically to each application.

Electrodeposited Co-P alloy and composite coatings: A review of progress towards replacement of conventional hard chromium deposits

Hard chromium coatings have attracted much attention due to their strong tribological and corrosion performance. There is a global need to replace such coatings in industrial applications owing to technical problems, environmental concerns and legislation. Co-P electrodeposits are a promising alternative to hard chromium in a variety of engineering applications due to their appreciable microhardness and high corrosion resistance . Attractive magnetic, tribomechanical and electrical properties are evident together with excellent thermal stability. Environmentally acceptable process conditions may be used which allow controlled deposition on diverse workpieces across a wide scale. This review provides an overview of the influence of operational parameters, including type of current control, electrolyte composition, pH, current density and electrolyte agitation on the physicochemical and mechanical characteristics of the deposits. The incorporation of ceramic particles into Co-P electrodeposits to produce tailored composite coatings is also considered. An insight is given into the development of next generation alloy and composite deposits to replace hard chromium deposits from acidic Cr(VI) baths. Diverse applications for Co-P electrodeposits are considered and topics deserving further R & D are highlighted. • A concise overview of Co-P alloy electrodeposits is provided. • The most common types of bath used for Co-P electrodeposition are considered. • The influence of operating conditions on properties of deposits is addressed. • Effects of included particles on deposit characteristics are comprehensively discussed. • Potential applications of Co-P films are highlighted.

Flow boiling heat transfer enhancement under ultrasound field in minichannel heat sinks

The enhancement of the heat transfer assisted by ultrasound is considered to be an interesting and highly efficient cooling technology, but the investigation and application of ultrasound in minichannel heat sinks to strengthen the flow boiling heat transfer are very limited. Herein, a novel installation of ultrasound transducers in the flow direction of a minichannel heat sink is designed to experimentally study the characteristics of heat transfer in flow boiling and the influence of operation parameters (e.g., heat flux, mass flux rate) and ultrasound parameters (e.g., frequency, power) on the flow boiling heat transfer in a minichannel heat sink with and without ultrasound field. Bubble motion and flow pattern in the minichannel are analyzed by high-speed flow visualization, revealing that the ultrasound field induces more bubbles at the same observation position and a forward shift of the onset of nucleation boiling along the flow direction, as ultrasonic cavitation produces a large number of bubbles. Moreover, bubbles hitting the channel wall on the left and right sides are found, and the motion speed of the bubbles is increased by 31.9% under the ultrasound field. Our results demonstrate that the heat transfer coefficient obtained under the ultrasound field is 53.9% higher than in the absence of the ultrasound field under the same conditions, and the enhancement ratio is decreased in the high heat flux region due to the change of the flow regime with increasing heat flux. This study provides a theoretical basis for the application of an ultrasound field in minichannel heat sinks for the enhancement of flow boiling heat transfer.

Process optimization of a fixed bed reactor system for direct air capture

The extraction of CO2 directly from the atmosphere (Direct Air Capture) is commonly employed using supported-amine sorbents. This adsorption technology is under rapid development with novel sorbent materials emerging and with processes being demonstrated on increasingly larger scale. Optimization of such processes requires accurate knowledge on sorbent characteristics and knowledge on how operational variables affect process performance. This study primarily focuses on the latter, where we aim to quantify the influence of operational parameters on the energy duty and CO2 productivity. In addition, we examine the influence of weather conditions on the adsorption rate. For this, we develop a dynamic model of the complete temperature-vacuum swing adsorption cycle (TVSA). This model was validated by experimental results on a kg-scale direct air capture system. The impact of selected operational variables was assessed by two-dimensional sensitivity analyses. We show that desorption temperature is preferably high, limited by the chemical stability of the sorbent material in this particular case. In addition, the sorbent working capacity should be high when opting for an optimization towards energy duty, whereas it reaches a clear optimum in terms of CO2 productivity. Finally, we conclude that weather conditions and diurnal variations can significantly affect the performance of a direct air capture process and should certainly be considered during design and operation. With these insights and the developed model, this study provides a sound basis for further process development and optimization of direct air capture using fixed bed technology combined with solid amine sorbents.

A numerical investigation of the impact of shield machine’s operation parameters on the settlements above twin stacked tunnels - A case study of Ho Chi Minh urban railway Line 1

Three-dimensional finite difference calculations are proposed to investigate the influence of operation parameters of the shield machines during twin stacked tunnel excavation on the surface settlements. The numerical model is validated by experimental data obtained from Hochiminh’s metro line 1 project, used as a reference case in this study. The parametric study focuses on the influence of the face support pressure, the grouting pressure, and the shield’s length. The numerical results indicated that a decrease does not always follow an increase in surface settlements' face and grouting pressure. A shorter shield machine causes smaller surface settlements to develop over single lower and twin stacked tunnels.

Sustainable removal of Cr(VI) using graphene oxide-zinc oxide nanohybrid: Adsorption kinetics, isotherms and thermodynamics

Metal-based adsorbents are limited for hexavalent chromium [Cr(VI)] adsorption from aqueous solutions because of their low adsorption capacities and slow adsorption kinetics. In the present study, decorated zinc oxide (ZnO) nanoparticles (NPs) on graphene oxide (GO) nanoparticles were synthesized via the solvothermal process. The deposition of ZnO NPs on graphene oxide for the nanohybrid (ZnO-GO) improves Cr(VI) mobility in the nanocomposite or nanohybrid, thereby improving the Cr(VI) adsorption kinetics and removal capacity. Surface deposition of ZnO on graphene oxide was characterized through Fourie Transform Infra-red (FTIR), UV–Visible, X-ray Diffraction (XRD), Field Emission Scanning Electron Microscopy (FESEM), Energy Dispersive Spectroscopy (EDS), and Brunauer–Emmett–Teller (BET) techniques. These characterizations suggest the formation of ZnO-GO nanocomposite with a specific area of 32.95 m2/g and pore volume of 0.058 cm2/g. Batch adsorption analysis was carried to evaluate the influence of operational parameters, equilibrium isotherm, adsorption kinetics and thermodynamics. The removal efficiency of Cr(VI) increases with increasing time and adsorbent dosage. FTIR, FESEM and BET analysis before and after the adsorption studies suggest the obvious changes in the surface functionalization and morphology of the ZnO-GO nanocomposites. The removal efficiency increases from high-acidic to neutral pH and continues to decrease under alkaline conditions as well. Mathematical modeling validates that the adsorption follows Langmuir isotherm and fits well with the pseudo 2nd order kinetics (Type 5) model, indicating a homogeneous adsorption process. The thermodynamics study reveals that Cr(VI) adsorption on ZnO-GO is spontaneous, endothermic, and entropy-driven. A negative value of Gibb's Free Energy represents the thermodynamic spontaneity and feasibility of the sorption process. To the best of our knowledge, this is the first study of Cr(VI) removal from aqueous solution using this hybrid nanocomposite at near-neutral pH. The synthesized nanocomposites prove to be excellent candidates for Cr(VI) removal from water bodies and natural wastewater systems.