Dye Solution Research Articles

ADSORPTIVE REMOVAL OF CRYSTAL VIOLET AND SUNSET YELLOW FROM WATER USING LABLAB PURPUREAUS HUSK- COST-EFFECTIVE DE-DYING APPROACH

A novel citric acid-activated Lablab purpureus husk is proposed to remove crystal violet (CV) and sunset yellow (SY) by column chromatographic elution in a cost-effective way. The adsorbent was characterized by Scanning Electron Microscopy (SEM) and the images supported the adsorptive nature of the material. The experiments were carried out on a chromatographic column by homogenously packing the pre-wetted adsorbent into the column and eluting the dye solution through it. The effects of initial dye concentration, adsorbent dose, pH, contact time, and flow rate were optimized. The efficient removal of up to 300 and 4400 µg/mL of CV and SY, respectively, was observed. The pH range of 4-5 for CV and >4 for SY were found effective. The flow rate was optimized at 1 ml/min. The contact time was found less than 10 minutes. The adsorbent was successfully removed 96.62% and 99.62% of CV and SY, respectively. The Freundlich and Langmuir adsorption isotherm studies were carried out to interpret the interaction between the adsorbate and adsorbent. These models are instrumental in optimizing and scaling up the adsorption process for practical and industrial applications. The experimental data for the adsorption of CV and SY fitted well with the Freundlich isotherm, and the kinetic study of both CV and SY fitted well with the pseudo-second-order reaction.

Moringa oleifera leaves extract-mediated synthesis of ZnO nanostructures for the enhanced photocatalytic oxidation of erythrosine.

This study was focused on the development of ZnO nanostructures for the efficient oxidation of erythrosine dye and for studying the antibacterial activity of ZnO. It was observed that the phytochemicals from Moringa oleifera leaves modified the size, shape, crystalline properties and surface chemical composition of the ZnO nanostructures. ZnO nanostructures synthesized with 15 mL Moringa oleifera leaves extract (S-15) demonstrated highly efficient oxidation of erythrosine dye under the illumination of natural sunlight. Various photocatalyst evaluation parameters, such as initial dye concentration, pH of the dye solution, catalyst dose and cycling stability, were studied. The S-15 sample of ZnO exhibited almost 100% dye removal in an alkaline pH of 12 and a low concentration of 4.54 × 10-5 M. Furthermore, improved antibacterial activity was also observed against E. coli and Bacillus subtilis bacteria strains. The use of Moringa oleifera leaves extract could be considered a low-cost, facile and ecofriendly green synthesis protocol for replacing the use of toxic chemicals and for eliminating the risk of releasing of toxic chemicals into the environment during the synthesis of high-performance nanostructured materials.

Exploring Pristine Tucumã (Astrocaryum aculeatum) Waste as a Sustainable Adsorbent for Textile Dye Removal

ABSTRACTTextile dyes are one of the main industrial contaminants, and their removal from wastewater using environmentally friendly alternatives has been a challenge for decades. In this context, this study aimed to analyze the use of tucumã (Astrocaryum aculeatum) seed residue as a novel and low‐cost adsorbent material for the decolorization of a textile dye solution. The seed shell was disinfected, dried, ground, and sieved. Its physical and chemical characteristics were analyzed by scanning electron microscopy (SEM), Fourier transform infrared spectroscopy (FTIR), and point of zero charge (pHPZC). The influence of initial pH (4.2–9.8) and dye concentration (95–745 mg/L) in the color removal was analyzed through a central composite rotatable design (CCRD) using 10 g/L of tucumã seed shell at 150 rpm for 4 h. Both pH and dye concentration linearly influenced color removal. Lower pH values and higher dye concentrations resulted in color removals above 40%. When pH 5 and 700 mg/L of dye were used, the adsorption capacity was higher than 50 mg/g. The adsorption isotherm that best fitted the data was Freundlich isotherm, indicating that the adsorbent has a heterogeneous surface and that multilayer adsorption occurs in the tucumã residue. These results indicate that pristine A. aculeatum seed residue can potentially be used as an adsorbent in the textile industry with no chemical or thermal activation.

THE INFLUENCE OF BETA-CAROTENE AND CHLOROPHYL CONCENTRATION ON THE OXIDATION RATE OF THEIR OIL SOLUTIONS

The object of the study is the induction period of accelerated oxidation of oil solutions of fat-soluble dyes chlorophyll and beta-carotene. The effect of the content of fat-soluble dyes on the induction period of accelerated oxidation of their solutions in sunflower oil was studied. The peculiarity of the work consists in establishing the approximation graphical and mathematical dependencies of the induction period of accelerated oxidation of refined sunflower oil on the combined content of chlorophyll and beta-carotene. This is of interest for predicting the shelf life of oil solutions of the specified fat-soluble dyes. It was determined that chlorophyll A has virtually no prooxidant effect provided that its content in the oil solution is up to 0.05 g/l. The content of chlorophyll A at the level of 0.10 g/l leads to a decrease in the induction period by 14 %; 0.20 g/l – by 36 %; 0.30 g/l – by 48 %. The content of beta-carotene at the level of 0.10 g/l leads to an increase in the induction period by 35 %; 0.20 g/l – by 47 %; 0.30 g/l – by 54 %. The content of 0.10 g/l beta-carotene and 0.05 g/l chlorophyll A in the fat system leads to a decrease in the induction period of accelerated oxidation by 8.4 % compared to an oil solution of 0.10 g/l beta-carotene without chlorophyll A. The obtained data are explained by the fact that there is a compensating effect of the antioxidant beta-carotene on the prooxidant action of chlorophyll A in the oil solution. A special feature of the obtained results is the possibility of predicting the shelf life of oil solutions of fat-soluble dyes. From a practical point of view, the results of the studies allow us to substantiate the composition of fat systems taking into account the joint features of the reactivity to oxidative destruction of chlorophyll and beta-carotene. The applied aspect of using the scientific result is the possibility of expanding the range of fat products of increased nutritional value with different contents of chlorophyll and beta-carotene.

Alcian Blue 8GX Remediation by Fe2+/Persulfate And Heat/Persulfate

In this work, decolorization of reactive Alcain Blue 8GX dye solution were investigated by persulfate oxidation activated by ferrous ion and heat. Three different temperature (40 °C, 60 °C and 80 °C) were tested during heat activated persulfate and ferrous ion activated persulfate were tested under various molar ratios of dye:Fe2+:persulfate ratio (1:1:1, 1:2:1, 1:1:0.5, 1:4:1). In addition, pH effect has been tested at ambient conditions (5.23) and pH of 3. The results showed that increasing the temperature and persulfate concentration was favorable to the degradation of the dye with decolorization efficiency as high as 91 % observed at 80 ℃ after 90 minutes of reaction at pH 3. The ratio 1:1:1 decolorized AB 8GX 73 % at pH of 3 and 72 % at pH 5.7 after 90 minutes.

Acid Blue 113 Degradation and Mineralization by UV/Persulfate Process

In this work, decolorization of reactive Alcain Blue 8GX dye solution were investigated by persulfate oxidation activated by ferrous ion and heat. Three different temperature (40 °C, 60 °C and 80 °C) were tested during heat activated persulfate and ferrous ion activated persulfate were tested under various molar ratios of dye:Fe2+:persulfate ratio (1:1:1, 1:2:1, 1:1:0.5, 1:4:1). In addition, pH effect has been tested at ambient conditions (5.23) and pH of 3. The results showed that increasing the temperature and persulfate concentration was favorable to the degradation of the dye with decolorization efficiency as high as 91 % observed at 80 ℃ after 90 minutes of reaction at pH 3. The ratio 1:1:1 decolorized AB 8GX 73 % at pH of 3 and 72 % at pH 5.7 after 90 minutes.

Two-photon pumped forward, backward and random lasing in a stilbazolium dye nanocomposite solution containing LAPONITE® as a scattering center.

Multiphoton upconversion lasing in scattering gain media has attracted considerable attention in recent years. LAPONITE® is a scattering medium consisting of 2-D nano-discs that can be dispersed as a transparent solution in aqueous media and forms a gel at high concentration. In this paper, we demonstrate two-photon pumped upconversion regular lasing along forward and backward directions as well as random lasing along all other directions. The gain medium was a mixture of PRL-L5 dye solution in DMF with a water solution of LAPONITE® in which LAPONITE® nano-discs of 25-30 nm diameter may form large-size particles of several hundred nanometers due to electrostatic binding between the dye molecules and the LAPONITE® nano-discs, and therefore can produce more efficient scattering feedback for random lasing generation. Using 795 nm and 100 fs laser pulses as two-photon pump sources, we observed random lasing at around 500 nm, characterized by both spectral and temporal narrowing in all directions apart from the traditional (colinear forward/backward) lasing directions. The peak spectral intensity of random lasing is ∼3.4 times higher than the normal fluorescence emission, but 105-106 times lower than the traditional forward lasing. This study shows the feasibility of generating both traditional forward/backward and random lasing in a moderately scattering gain medium for applications in diverse fields such as remote sensing, optical communications, and upconversion imaging.

Impact of rotational speed and pH on tribocatalytic dye degradation activity of 0.5Ba(Zr0.2Ti0.8)O3‒0.5(Ba0.7Sr0.3)TiO3

AbstractThe degradation of methylene blue dye via tribocatalysis using 0.5Ba(Zr0.2Ti0.8)O3‒0.5(Ba0.7Sr0.3)TiO3 (BST‒BZT) ceramic powders was investigated under various conditions. The tribocatalytic process was initiated using magnetic stirring with a polytetrafluoroethylene‐coated magnetic bar in a glass beaker setup. The degradation efficiency was evaluated at different stirring speeds of 300, 500, and 700 rpm. The results showed significant variation in degradation rates, with the highest degradation efficiency of ∼73% achieved within 12 h at a rotational speed of 700 rpm. Additionally, the impact of pH on the degradation process was examined by adjusting the dye solution to pH levels of 3, 6, and 9. The degradation efficiency increased with higher pH levels, with the maximum degradation occurring in the basic medium (pH 9). Kinetic analysis revealed that the degradation process adhered to pseudo‐first‐order kinetics, with rate constants of 0.023, 0.035, and 0.104 min⁻1 at different stirring speeds of 300, 500, and 700 rpm, respectively. This study showcases the potential of BST‒BZT ceramics as efficient tribocatalysts for degrading organic pollutants in wastewater, emphasizing the impact of stirring speed and pH on degradation efficiency.

Effect of Cloisite 15A Clay Dispersion on the Structural Characteristics of PVDF Nanocomposite Membrane

Recent interest in nanoparticles-reinforced polymer matrices has surged due to their superior properties over virgin polymers. Nevertheless, there remains a gap in research regarding the impact of clay dispersion on polymeric membranes employed in membrane distillation (MD). This study aims to investigate how the dispersion of Cloisite 15A (C15A) clay influences the structure of polyvinylidene fluoride (PVDF) membranes and improves dye removal efficiency. A nanocomposite membrane consisting of polyvinylidene fluoride-Cloisite 15A clay (PVDF-C15A) was prepared using a phase-inversion process. Additionally, a PVDF membrane without clay was prepared as a control. The influence of clay on the crystalline structure of the PVDF membrane was examined by analyzing morphology, porosity, wetting pressure, contact angle, surface roughness, mechanical strength, and thermal stability. X-ray diffraction spectroscopy and transmission electron microscopy were employed to assess the dispersion state of the clay. The fabricated membranes were evaluated in direct contact membrane distillation for treating dyeing solution. To understand the interaction between dye particles and the membranes, zeta potentials of both the control and nanocomposite membranes were measured. The study revealed that the nanocomposite membrane exhibited higher permeate flux compared to the control membrane. This improvement was primarily attributed to the well-dispersed layered silicate within the nanocomposite membrane, which enhanced its structural properties significantly.

Optimization of Palm Shell Drying to Enhance Adsorption Performance: A Kinetic Study and Exponential Model

Palm shell has great potential as an adsorbent material due to its porosity and thermal stability, but its high moisture content can affect its surface area and absorption capacity. This study aims to optimize the drying process of palm shells to enhance their adsorption performance by applying an exponential model. The drying process was carried out at a temperature of 80°C with time variations ranging from 1 to 6 hours. Parameters measured included wet and dry moisture content, Moisture Ratio (MR), and drying rate. The results showed that drying the palm shell for 4 hours yielded the best results, with a reduction in wet moisture content by 19-21% and dry moisture content by 23-28%. The exponential model analysis provided drying rate constants for the three samples of 0.0443, 0.0238, and 0.0159, respectively. The measured MR graph compared with the model predictions showed a very good fit, with an R² value close to 1, meaning the exponential model is effective in predicting the drying rate. Adsorption performance was tested using a Dylon dye solution with a concentration of 25 ppm, where the palm shell was able to adsorb up to 85% of the dye within 180 minutes.

Comparison of Photocatalytic Activity: Impact of Hydrophilic Properties on TiO2 and ZrO2 Thin Films

Thin films (TFs) of TiO2 and ZrO2 were prepared and characterized to evaluate their structural and optical (SO) properties and, later, to test their efficiency for the photocatalytic degradation (PD) of methylene blue (MB) in aqueous solution. The X-ray diffraction patterns showed that the TiO2 TFs had an anatase crystalline structure, unlike the ZrO2 TFs, which showed a tetragonal crystalline structure that was verified by Raman spectroscopy. The band gap (BG) energies, as calculated from UV-Vis spectroscopy and diffuse reflectance spectroscopy, corresponded to 3.2 and 3.7 eV for the TiO2 and ZrO2 TFs, respectively. SEM examination of the obtained materials was also carried out to assess the surface morphology and topography. The comparative study of the FTIR spectra of the TiO2 and ZrO2 TFs successfully confirmed the composition of the two-metal oxide TFs. The electrical properties of the films were studied by conductivity measurements. The two films also showed a similar thickness of about 200 nm and a substantially different photocatalytic performance for the discoloration of MB in aqueous solution. The corresponding rate constants, as obtained from a pseudo-first-order kinetic model, revealed that TiO2 films promote color removal of the model dye solution almost 20 times faster than the rate observed for ZrO2 modified glass substrates. We suggest that this difference may be related to the hydrophilic character of the two films under study, which may affect the charge carrier injection process and, therefore, the overall photocatalytic performance.

Anti‐fouling loose polyamide nanofiltration membrane preparation by biodegradable sophorolipids for precise separation of simulated dyeing wastewater

AbstractBackgroundStrengthening the recycling and utilization of resources is deeply significant in achieving carbon neutrality. The nanofiltration membranes possess separation ability within the nanoscale by utilizing special pore size ranges and surface charge properties, showing great application prospects in resource recycling. The commercial nanofiltration membranes are mainly prepared by interfacial polymerization with fast reaction speed and easy scaling‐up advantages. However, the obtained polyamide nanofiltration membranes possess dense selective layers with low permeance and separation efficiency to the molecules. Herein, the biodegradable surfactant sophorolipid was added to the aqueous solution to improve the performance of the polyamide nanofiltration membranes.ResultsCompared with the traditional nanofiltration membranes, the permeance of the sophorolipid‐modified nanofiltration membrane was improved from 3 to 18 L·m−2·h−1·bar−1. The modified membrane showed high rejection of the dyes with large molecular structures and low rejection of those with small molecular structures.ConclusionThe modified membrane may separate the mixed dye solution of congo red (molecular weight 696.66 g/mol) and indigo carmine (molecular weight 407.98 g/mol) and the mixed congo red/NaCl solution precisely. Besides, the modified membrane showed good anti‐fouling properties in the long‐term stability test. This study may offer research significance for the resource treatment of printing and dyeing wastewater. © 2024 Society of Chemical Industry (SCI).

Preparation and Piezocatalytic Performance of γ-AlON Particles for Dye-Pollutant Degradation Under Ultrasonic Vibration.

Piezocatalytic materials have attracted widespread attention in the fields of clean energy and water treatment because of their ability to convert mechanical energy directly into chemical energy. In this study, γ-AlON particles synthesised using carbothermal reduction and nitridation (CRN) were used for the first time as a novel piezocatalytic material to degrade dye solutions under ultrasonic vibration. The γ-AlON particles exhibited good performance as a piezocatalytic material for the degradation of organic pollutants. After 120 min under ultrasonic vibration, 40 mg portions of γ-AlON particles in 50 mL dye solutions (10 mg/L) achieved 78.06%, 67.74%, 74.29% and 64.62% decomposition rates for rhodamine B (RhB), methyl orange (MO), methylene blue (MB) and crystal violet (CV) solutions, respectively; the fitted k values were 13.35 × 10-3, 10.79 × 10-3, 12.09 × 10-3 and 8.00 × 10-3 min-1, respectively. The piezocatalytic mechanism of γ-AlON particles in the selective degradation of MO was further analysed in free-radical scavenging activity experiments. Hydroxyl radicals (•OH), superoxide radicals (•O2-), holes (h+) and electrons (e-) were found to be the main active substances in the degradation process. Therefore, γ-AlON particles are an efficient and promising piezocatalytic material for the treatment of dye pollutants.

Kinetic and Isothermal Analysis of the Adsorptive Elimination of Direct Yellow 26 Dye Utilizing Activated Bioadsorbent From Textile Effluent.

Due to their widespread usage in recent years, synthetic dyes may be difficult to remove and pose a health concern. Bioadsorbents proved a low-cost and sustainable method for dye removal. In this study, straight yellow 26 is extracted from textile effluent using sugarcane bagasse. Sugarcane bagasse was treated with propionic acid to enhance the adsorption capability and 0.25 mm particle size was used for further studies which was confirmed by BET analysis. Standard solutions of direct yellow 26 dye were prepared from 10 to 100 ppm concentrations and absorbance was recorded with the help of a UV visible spectrophotometer. After optimizing different parameters (concentration of dye and bioadsorbent dose, pH, time, and particle size), the studies explored that the maximum dye removal percentage was 89% obtained at pH 3, contact time 120 min, particle size 0.25 mm, high adsorbent, and low concentration of dye solution. The kinetic studies were also employed to comprehend the adsorption isotherm and Freundlich isotherm that revealed the pseudo-first-order adsorption process.

Fabrication of a Random Laser by Embedding Copper Oxide Nanoparticles in Nonmetallic Host Media.

In this work, a simple, low-cost method for fabricating random gain media from Rhodamine B dye solution containing highly-pure CuO nanoparticles in transparent resin hosts is proposed. The spectroscopic characteristics of the dye solution samples were investigated with varying dye concentrations, along with nanoparticles of different particle sizes and concentrations. The fabricated samples were excited using two laser sources (405 and 530 nm) to record the fluorescence spectra. Our findings indicate that nanoparticles ranging in size from 15 to 78 nm may not have a significant impact on the fluorescence intensity or the peak wavelength at which maximum fluorescence occurs. Additionally, the fluorescence peak width, centered around 595 nm showed minimal sensitivity to the variation in particle size. The optimal concentration of nanoparticles in the dye solution was determined based on the optimum values of scattering spectral width and anisotropy parameter. Subsequently, the gain coefficient was calculated and correlated with these two parameters. It was found that the samples with the highest fluorescence intensity can be achieved using dye dissolved in transparent resin at a molar concentration of 5 × 10-5 M, containing 0.03-0.04 mg of CuO nanoparticles with a particle size of 78 nm.

Enhanced Remediation of Textile Dyes via Nonmetal-Modified Layered Graphitic Carbon Nitride: Influence of Various Oxygen Precursors

Layered two-dimensional (2D) graphitic carbon nitride (gCN)) doped with nonmetals has been extensively utilized as a photo-electrocatalyst. Herein, gCN doped with Oxygen was synthesized through a thermal polymerization process. The effect of various oxygen forerunners, namely citric acid (CA), oxalic acid (OX), and lactic acid (LA) on the photocatalytic ability of the gCN was analyzed. The proposed O-doped gCN samples basic characteristics were characterized by different analytical analyses. Indeed, the O-gCN has formed a sheet-like nature with a nanometre range, so often called a nanosheet. Superior photocatalytic performance was measured when the gCN was prepared by the CA as the O-precursor; 95% malachite green (MG) removal was attained within a short treatment time of 40min by adding a 20mg photocatalyst. The influences of different parameters of catalyst concentration, different precursors, and initial pH of MG degradation were also studied. The generation of active radicals played a major part in the degradation of the MG dye solution. These findings offer fundamental insight into utilizing the O-gCN for the remediation of textile effluents in water resources. The preparation of enormous metal-free catalysts via non-metal doping toward the environmental clean-up.

Ultrasound-guided intercostal nerve injection in rabbit cadavers: Technique description and comparison with blind approach.

To develop an ultrasound-guided technique for intercostal nerve blocks in rabbit cadavers and to compare the success rate and potential complications of this technique to blind injection. Prospective, randomized, blinded, descriptive experimental cadaveric study. A group of nine adult domestic rabbit cadavers (body mass 1.8-2.4 kg). Anatomic landmarks were identified by dissection of one cadaver and used to develop the ultrasound-guided technique. Eight cadavers were administered blind injections on one hemithorax and ultrasound-guided injections on the opposite hemithorax. The side used for each treatment was randomly assigned. For both techniques, the third to ninth intercostal nerves were targeted and 0.1 mL of yellow dye solution was injected per site. Medial displacement of the parietal pleura was assessed during ultrasound-guided injections. Rabbits were dissected following injection, and injections were considered successful if the circumference of the intercostal nerve was stained with dye. Additionally, the internal aspect of the parietal pleura was assessed for the presence of free dye to determine whether perforation of the parietal pleura had occurred. The number of stained nerves and incidence of pleural perforations were compared between injection techniques using Fisher's exact test. Data were considered statistically different if p < 0.05. A total of 56 blind and 56 ultrasound-guided intercostal injections were performed. Success rates of the blind and ultrasound-guided techniques were 35.7% and 66.0%, respectively (p= 0.002). The internal aspect of the pleura was stained in 23.2% of blind and 21.4% of ultrasound-guided injections, with no significant difference between groups (p > 0.999). Ultrasound guidance improves the accuracy of intercostal nerve injections when compared with a blind technique; however, pleural puncture is a common complication when performing intercostal injections with both techniques studied.

Effects of Preparation Conditions on Performance of PES:PEG Flat Sheet Membrane for MG Dye Separation

This study deals with the morphology and performance properties of a novel thin flat sheet ultrafiltration membrane; Malachite Green (MG) dye filtration behavior was evaluated in the cross-flow filtration system. The prepared membranes included the incorporation of 16 wt. % of polyether sulfone (PES)/DMF and 5 wt.% of Polyethylene Glycol (PEG) via the phase inversion process. Adding PEG decreased the internal concentration polarization, improved the membrane hydrophilicity, changed pore morphologies, and enhanced membrane performance. The SEM and AFM tests were used to characterize the composition and structure of the membrane. With different casting conditions, the membrane shape changed. The effect of membrane thickness (100, 150, and 200) µm and coagulation bath properties temperature (15, 25, and 35) °C and composition DMF (10, 20, 30 %) in water on the fabricated membrane were investigated. To evaluate the membrane filtration performance, the fabricated membranes were applied in an ultrafiltration system to treat Malachite Green dye solution at a concentration of (10 ppm) as a model pollutant. Based on the obtained results, the ideal membrane parameters were150 µm in thickness, 35°C in temperature, and 10% in composition DMF; the removal efficiency was observed to be (94.5%, 93%, and 99.5%) while the permeate flux (45, 35 and 30) LMH, respectively.

Anatomical assessments of injectate spread stratified by the volume of the intertransverse process block at the T2 level

BackgroundThis cadaveric study aimed to analyze injectate spread to target nerves during a single-injection, ultrasound-guided intertransverse process block.MethodsAn ultrasound-guided intertransverse process block with three different injectate volumes was administered to...

Reduced graphene oxide – CeO2 nanocomposites for photocatalytic dye degradation

Over the past few decades, the widespread use of dyes has led to considerable environmental pollution, posing serious threats to human health and ecosystems. In this context, here focus on a tailored nanocomposite comprising reduced graphene oxide (rGO) and cerium oxide (CeO2) to eradicate methylene blue (MB) dye. The fabrication process involves a facile synthesis wherein CeO2 nanoparticles are anchored onto rGO sheets through co-precipitation treatment by mixing a precursor salt of cerium with graphene oxide (GO) in presence of reducing agent. The resulting nanocomposites were characterized using X-ray diffraction (XRD) analysis which confirms the crystallite size of CeO2 and rGO-CeO2 determined to be 21.61 nm and 10.74 nm respectively. Further FE-SEM analysis vividly illustrates the relatively spherical form of CeO2, which is dispersed on the rGO surface and energy dispersive X-ray spectroscopy (EDX) results provide clear evidence of the presence of carbon, cerium and oxygen in the composite. Additionally, Fourier-transform infrared spectroscopy (FTIR) confirms the composition of the rGO-CeO2 nanocomposites demonstrating the existence of various oxygen-containing groups, including O–H, C=O and Ce–O bonds. Thermogravimetric analysis (TGA) highlights that the rGO-CeO2 nanocomposites exhibits higher thermal stability with only 21.88 % weight loss up to 400 °C. Moreover, the photocatalytic activity of rGO-CeO2 nanocomposite exhibits a remarkable 94.92 % degradation of MB dye within 80 min under optimal conditions of UV light irradiation (λ = 254 nm), with a catalyst dosage of 7 mg in a 20 ppm of MB dye solution at pH 9. In contrast, pristine rGO and CeO2 achieved only 32.27 % and 38.48 % in 100 and 90 min respectively. The kinetics of photocatalysis process were meticulously studied and revealed that they followed pseudo-second order kinetic model suggesting chemisorption of MB dye onto nanocomposites prior to degradation. The stability of the nanocomposite was assessed under optimal conditions, demonstrating robust MB degradation (78 %) even up to the 4th cycle. Overall, the successful outcomes of this study show significant potential for degrading MB dye in wastewater by using the rGO-CeO2 nanocomposite.