Adsorption Of Hexavalent Chromium Research Articles

Effect of pyrolysis temperature on physicochemical properties and hexavalent chromium adsorption of the corncob biochars

Effect of pyrolysis temperature on physicochemical properties and hexavalent chromium adsorption of the corncob biochars

Adsorption of hexavalent chromium using Water Hyacinth Leaf Protein Concentrate/Graphene Oxide hydrogel.

Water Hyacinth Leaf Protein Concentrate/Graphene Oxide (WHLPC/GO) hydrogel was synthesized for the removal of Cr(VI) from wastewater. About 90% of the prepared hydrogel constitutes WHLPC. The prepared material was characterized by FT-IR and XRD. The process variables such as pH, contact time, adsorbentdosage, initial Cr(VI) concentration, and temperature were optimized using a batch mode experiment. Kinetic studies were alsoconducted and it was observed that the chemosorptive pseudo-second-order best described the adsorption system with a correlation coefficient(R2) of 0.984. The highest adsorption capacity of 322.00 mg/g was achieved at pH 1.0, and equilibrium was achieved within 420 min. Various isotherm models were analyzed using non-linear fitting. It was found that the Sips model provides the best fit, indicating heterogeneous and uniform active site surface adsorption of Cr(VI) on the WHLPC/GO. The reuse efficiency of the synthesized material was also found to be greater than 84% for five consecutive cycles. Thermodynamic studies were conducted and results revealed that the adsorption was spontaneous and endothermic.

Construction of an OCP-ATR-FTIR Spectroscopy Device to In Situ Monitor the Interfacial Reaction of Contaminants: Competitive Adsorption of Cr(VI) and Oxalate on Hematite.

The comprehensive understanding of contaminant interfacial behavior strongly depends on the in situ characterization technique, which is still a great challenge. In this study, we constructed a device integrated with open-circuit potentialand attenuated total reflectance Fourier transform infrared (OCP-ATR-FTIR) spectroscopy to simultaneously monitor the electrochemical and infrared spectral information on the interfacial reaction for the process analysis, taking the competitive adsorption of hexavalent chromium (Cr(VI)) and oxalate on hematite nanocubes (HNC) as an example. The synchronous OCP and infrared results revealed that Cr(VI) interacted with HNC via bidentate binuclear inner-sphere coordination, accompanied by electron transfer from HNC to Cr(VI), while oxalate was adsorbed on HNC through bidentate mononuclear side-on inner-sphere coordination with electron transfer from HNC to oxalate, and also outer-sphere coordination with negative charge accumulation. When oxalate was added to HNC with preadsorbed Cr(VI), oxalate would occupy the inner-sphere adsorption sites and thus cause the detaching of preadsorbed Cr(VI) from HNC. This study provides a promising in situ characterization technique for real-time interfacial reaction monitoring and also sheds light on the competitive adsorption mechanism of oxalate and Cr(VI) on the mineral surface.

Ferrous disulfide and iron nitride sites on hydrochar to enhance synergistic adsorption and reduction of hexavalent chromium

In this study, a novel hydrochar containing ferrous disulfide (FeS2) and iron nitride (FeN) was prepared via a one-pot hydrothermal method to enhance the synergistic adsorption and reduction of hexavalent chromium (Cr(VI)). This material (Fe3-SNHC) exhibited a Cr(VI) removal capacity of 431.3 mg·g−1 and high tolerance to coexisting anions at pH 2. Adsorption occurred via monolayer chemisorption. Variation in material structure and density functional theory calculations proved that multiple active sites formed by interactions between heteroatoms improved the chemical inertness of hydrochar. FeN and FeS2 with two electron-donating groups had strong reducing ability to facilitate the conversion of Cr(VI) to trivalent chromium. It was concluded that next to electrostatic adsorption and complexation, synergistic reduction among multiple active sites were the dominant mechanisms involved in the removal Cr(VI). This study shows that Fe3-SNHC is a promising and environment-friendly material for Cr(VI) to remove it from wastewater.

Adsorption of hexavalent chromium by Simarouba glauca in a fixed-bed column: a full-factorial design and mathematical modelling

ABSTRACT Due to its high toxicity and mobility, hexavalent chromium must be adequately eliminated from effluent or wastewater. For Cr(VI) adsorption, it is increasingly becoming customary to use inexpensive, readily accessible plant-based materials. It has been discovered that the popular medicinal herb Simarouba glauca is quite effective at removing Cr(VI) from aqueous media. The first stage of this study examines Cr(VI) adsorption onto S. glauca using the 25 Full Factorial Design technique. It was possible to determine the major effects of S. glauca dosage and how they interacted with pH, temperature, the initial Cr(VI) concentration, and time. The adsorption was predicted adequately with the aid of ANOVA, t-test, Pareto charts, main effect, and interaction plots. The second section of the study focuses on the potential for continuous adsorption of S. glauca in a fixed-bed column. The Cr(VI) inlet concentration (50, 100 and 150 mg/L), flow rate (13 and 21 mL/min), and S. glauca bed height (30, 36, 40 and 45 cm) all had an impact on the breakthrough qualities of the adsorption system. The fixed-bed adsorption models of Thomas, Yoon–Nelson, and Adams-Bohart were used to fit the adsorption data. The Thomas model, with a flow rate of 13 mL/min, a bed height of 45 cm and an inlet concentration of 100 mg/L of Cr(VI), calculated the adsorption capacity to be 611.6 mg/g with a coefficient of 0.99. The findings are consistent with the hypotheses advanced by Thomas and Yoon–Nelson. This study suggests that this technique could be used to treat chromium-contaminated water in industrial settings.

Enhanced Adsorption of Hexavalent Chromium from Aqueous Solutions by Iron- manganese Modified Cedarwood Biochar: Synthesis, Performance, Mechanism, and Variables.

Three modified biochar (Cunninghamia lanceolata) with iron and manganese elementals (FMBCs) were successfully prepared and used to remove hexavalent chromium (Cr(VI)) from aqueous solutions. The biochar before and after decoration were characterized by advanced instruments. The adsorption capacities of modified biochar in different Cr(VI) (20mg·L- 1, 1mg·L- 1) solutions were 4868.28mg·kg- 1 and 300mg·kg- 1. The Cr(VI) removal was highest at pH 2. The possible adsorption was considered to be ion exchange adsorption, chemisorption, and electrostatic attraction. Meanwhile, interfering ions are conducive to increasing the adsorption content. FMBCs prepared at different temperatures showed different characteristics, single-use and cycle-use performance, and high and low concentration removal superiority. The result indicated that FMBCs had a promising potential as an adsorbent to remove toxic and harmful Cr(VI) from aqueous solutions.

High-capacity adsorption of hexavalent chromium by a polyaniline-Ni(0) nanocomposite adsorbent: Expanding the Langmuir-Hinshelwood kinetic model

A nanocomposite of 2-napthalenesulfonic acid doped-polyaniline decorated with zero valent nickel nanoparticles (PANI-NSA@Ni0), was considered for the removal of hexavalent chromium from synthetic effluent. Adsorption conditions (pH, dose) were optimised, and parameters necessary for the design of PANI-NSA@Ni0-based adsorption equipment (adsorbent capacity, kinetic constants, etc.) were estimated from batch adsorption experiments. PANI-NSA@Ni0 successfully achieves total hexavalent chromium removal at a dose of 0.6 g/L, corresponding to a Cr(VI) loading of 333.3 mg/g, and when 2 < pH < 3. The combined monolayer capacity of the adsorbent was found to be 820.5 mg/g, with equilibrium adsorption behaviour adequately described by a modified dual-site Langmuir isotherm model. The adsorption of Cr(VI) by PANI-NSA@Ni0 was found to be largely unaffected by the presence of competing ions. Following adsorption, successful recovery of 95.5% of adsorbed chromium was achieved by employing HNO3 followed by NaOH as desorption agents, however this resulted in ≈ 88% loss in adsorption capacity for the subsequent cycle. After redeposition of Ni0 on the desorbed material, the adsorbent’s capacity was restored to 92% of the original capacity. An adsorption-coupled reduction mechanism, followed by the precipitation of Cr(OH)3, is believed to be the major mechanistic process responsible for Cr(VI) removal. Based on the proposed mechanism, a modified Langmuir-Hinshelwood adsorption-coupled reduction kinetic model was used to successfully describe the adsorption kinetics. The modified Langmuir-Hinshelwood adsorption-coupled reduction kinetic model produces rate constants which are independent of operating conditions such as initial pollutant concentration and adsorbent dose, and adequately describes the system’s equilibrium using the same rate constants. Thermodynamic parameters calculated using the best fitting isotherm model and novel kinetic model were both in agreement, and revealed that the adsorption process proceeds spontaneously and endothermically, with an increase in randomness at the solid–liquid interface and potential changes in the structure of the adsorbent/adsorbate.

Reduction and Adsorption of Hexavalent Chromium by Iron Sulfide Loaded Biochar: Isotherms, Kinetics and Thermodynamics

AbstractThe removal of noxious Cr(VI) from water has gained worldwide attention. In this study, biochar derived from macadamia nut shells (MHP) was embedded with iron sulfide (FeS) nanoparticles produced through a solid‐phase reduction of pyrite. The MHP‐FeS composite was evaluated for the adsorption of Cr(VI) and its subsequent reduction to Cr(III). The scanning electron microscope images revealed that the particles were of irregular shape, while the energy dispersive spectroscopy results showed the existence of Fe, S, O, and C atoms. X‐ray diffraction peaks at 2=29.8°, 33.7°, 43.7°, and 53.1° were characteristic of the formation of FeS nanoparticles. A maximum Cr(VI) adsorption capacity of 4.95 mg/g was obtained at pH 3, 60 min, and 25 °C. The higher correlation coefficient (R2&gt;0.873) and lower residual standard error (RSE=1.43) values pointed to the adsorption process favoring Langmuir and pseudo‐second‐order models. As per thermodynamic reaction calculations, the remediation process was spontaneous and endothermic. With further optimization, this material could be a potential adsorbent and reductant for Cr(VI) in water.

Adsorption of hexavalent chromium, Rhodamine B and Congo red simultaneously in aquatic by zeolitic imidazolate framework coupling carbon nanotubes.

Zeolitic imidazolate framework/carbon nanotube (ZIF-67/CNTs) was prepared by precipitation method. ZIF-67/CNTs maintained the characteristics of large specific surface area and high porosity of ZIFs, showing stable cubic structure. The adsorption capacities of ZIF-67/CNTs for Cong red (CR), Rhodamine B (RhB) and Cr(VI) were 36.82 mg/g, 1421.29 mg/g and 716.67 mg/g under the conditions of 2:1, 3:1 and 1:3 masses of ZIF-67 and CNTs, respectively. The optimum adsorption temperature of CR, RhB and Cr(VI) were 30 °C, and the removal rates at the adsorption equilibrium were 81.22%, 72.87% and 48.35%. The adsorption kinetic model of the three adsorbents on ZIF-67/CNTs was consistent with the quasi-second order reaction model, and the adsorption isotherms were more consistent with adsorption law of Langmuir. The adsorption mechanism for Cr(VI) was mainly electrostatic interaction, and the adsorption mechanism for azo dyes was the combination of physical and chemical adsorption. This study would provide theoretical basis for further developing metal organic framework (MOF) materials for environmental applications.

Coal Fly Ash Decorated with Graphene and Polyaniline Nanocomposites for Effective Adsorption of Hexavalent Chromium and Its Reuse for Photocatalysis.

Coal fly ash was functionalized and modified with graphene oxide and polyaniline (CFA/GO/PANI nanocomposite) through hydrothermal synthesis, which was used for remediation of hexavalent chromium (Cr(VI)) ions. Batch adsorption experiments were carried out to investigate the effects of adsorbent dosage, pH, and contact time on the removal of Cr(VI). The ideal pH for this work was 2, and it was used for all other studies. The Cr(VI)-loaded spent adsorbent CFA/GO/PANI + Cr(VI) was reused as a photocatalyst for the degradation of bisphenol A (BPA). The CFA/GO/PANI nanocomposite removed Cr(VI) ions rapidly. The adsorption process was best described by pseudo-second-order kinetics and the Freundlich isotherm model. The CFA/GO/PANI nanocomposite demonstrated a high adsorption capacity of 124.72 mg/g for Cr(VI) removal. In addition, the Cr(VI)-loaded spent adsorbent played a significant role in the photocatalytic degradation of BPA with 86% degradation. The reuse of the Cr(VI)-loaded spent adsorbent as a photocatalyst presents a new solution for the reduction of secondary waste from the adsorption process.

Potassium Hydroxide Activation as an Adsorbent for Equilibrium Isotherms of Hexavalent Chromium Adsorptions onto &lt;i&gt;Garcinia mangosteen&lt;/i&gt; Shell

The equilibrium isotherms of hexavalent chromium adsorption from water on potassium hydroxide (KOH) activated for mangosteen shell as an adsorbent by carbonization at 400 °C for 2 hours has been researched. The effective specific surface area of a biochar adsorbent is 164 m2/g, and its hexavalent chromium adsorption capacity can be encountered to be replied to on the pH 2.0 with initial feed concentration and temperature. The equilibrium adsorption isotherm models based on the Freundlich, Langmuir, Temkin, Hurkins-Jura, Halsay, Dubinin-Radushkevich, and Jovanovic models have been accompanied to compare the sorbate-sorbent system. The Freundlich isotherm model indicated a good fit with the experimental data for the system studied.

Potassium Hydroxide Activation as an Adsorbent for Kinetic Models of Hexavalent Chromium Adsorptions onto &lt;i&gt;Garcinia mangosteen&lt;/i&gt; Shell

The utilized adsorption kinetic models, i.e., pseudo-zero order, pseudo-first-order, pseudo-second order, intraparticle diffusion, Bangham’s pore diffusion, liquid film diffusion, modified Freundlich and Elovich models have been cultivated the hexavalent chromium adsorption process. A high correlation coefficient (R2) and a small residual root mean square error (RMSE) and Chi-square (χ2) can be depicted in the pseudo-first order for the kinetic adsorption process of hexavalent chromium adsorption on the activated mangosteen shell with potassium hydroxide and carbonized at 400 °C for 2 h as a biochar adsorbent which has a specific surface area of 164 m2/g.

Fabrication of CMC-PVP based RGO modified magnetic hydrogel for the adsorption and photo-reduction of hexavalent chromium from simulated waste water

Chromium (VI) is considered as highly toxic among other heavy metal ions due to its carcinogenic activity. The present laboratory scale experiment depict the fabrication of CMC/PVP-RGO-NiFe2O4 (CPRN) based hydrogel. The CPRN was investigated for the adsorption and photo reduction removal of hexavalent chromium (Cr VI). Here Carboxymethyl cellulose (CMC) & Polyvinylpyrrolidone (PVP) taken as main backbone for the hydrogel fabrication. The reduced graphene oxide (RGO) was taken as surface modifier followed by nano NiFe2O4 as magnetic substrate. The fabricated magnetic hydrogel composite (CPRN) was characterized by using XRD, FTIR, FESEM, and HR-TEM. The adsorption results showed that about 92.2% of Cr (VI) has been adsorbed on CPRN over a time period of 2 h. On the other hand about 94.7% was photo-reduced over 1 h of solar illumination. The kinetics of overall adsorption and photo-reduction process are pseudo-second-order fits and follow the Langmuir models, which suggests the single layered adsorption mechanism. The maximum adsorption capacity of CPRN was estimated about 338.6 mg/g.

Enhanced Cr(VI) Adsorption from Water by Reactivation Treatment of Apricot Shell Activated Carbon

The pore structure of apricot shell activated carbon was changed by reactivation treatment. The influence of reactivation treatment of activated carbon on the adsorption of hexavalent chromium [Cr(VI)] from water was investigated under different conditions. The results show that the reactivation treatment enriches the pore structure of activated carbon and increases the pore size. When pH is under 4, the reactivation treatment of activated carbon does not cause a significant difference in the adsorption amount of Cr(VI) compared with untreated activated carbon. However, it is obviously contribute to Cr(VI) adsorption solution when pH is more than 4. In the same adsorption temperature, adsorption time, solution pH, and ratio of activated carbon to Cr(VI), reactivated activated carbon shows higher Cr(VI) adsorption capacity in aqueous solution than the untreated activated carbon, and maximum Cr(VI) removal rate of the reactivated activated carbon reaches 99.83%.

Modeling and Optimization of Hexavalent Chromium Adsorption by Activated Eucalyptus Biochar Using Response Surface Methodology and Adaptive Neuro-Fuzzy Inference System

Due to its excellent textural features, non-toxicity, low cost and high uptake capacity, biochar has been synthesized from various biomasses and utilized as a biosorbent to remove hexavalent chromium (Cr6+) from contaminated water. Herein, activated eucalyptus biochar (AEB) was prepared via a pyrolysis-chemical activation process and then used as a less expensive biosorbent to adsorb Cr6+ ions from an aqueous solution. Proximate, ultimate, Fourier transform infrared (FTIR) spectroscopy, scanning electron microscopy (SEM), and Brunauer–Emmett–Teller (BET) analyses were employed in appraising the biosorbent characteristics. Furthermore, response surface methodology (RSM) and adaptive neuro-fuzzy inference system (ANFIS) were applied to establish the best operating conditions. Based on the results obtained, there was little discrepancy between the observed data and the data predicted by RSM and ANFIS approaches. In terms of prediction accuracy, ANFIS (MAE = 2.512 and R2=0.9200) was superior to RSM (MAE = 2.512 and R2=0.9002). Under best-optimized conditions (initial Cr6+ concentration = 38.14 mg/L, biosorbent dosage = 1.33 g/L and pH = 4.35), which were offered by the ANFIS–ACO technique, the maximum percentage removal of 99.92 ± 0.18% was achieved. The AEB performed exceptionally well due to its better textural characteristics, well-developed porous framework, and dominance of active surface functional groups, which were confirmed by BET, SEM, and FTIR analyses. The comparison of RSM, ACO and GA for process parameter optimization has not been reported in the open literature for Cr6+ adsorption by AEB and hence has been shown in this study.

Adsorption of hexavalent chromium from aqueous solution using cationic modified rice husk: Parametric optimization via Taguchi design approach

The current work study the adsorption capacity of modified rice husk for the removal of Cr(VI) from aqueous solution. The rice husk was prepared and modified cationicaly. The cationic modified risk husk (cRH) was characterized by scanning electron microscopy (SEM) and fourier transform infrared (FTIR) spectroscopy. Also, point-of-zero pH (pHzero), specific surface area (m2/g) and bulk density (g/cm3) of the cRH were determined. The adsorption process was optimized by considering four independent process parameter at three variation levels using Taguchi design approach. The results showed the bulk density (0.392 g/cm3) and surface area (192 m2/g) which revealed the presence of numerous sorption sites on the cRH. Also the SEM micrograph showed the pores of different sizes which favoured the adsorption of Cr(VI). Taguchi experimental design predicted initial Cr (VI) concentration of 25 mg/L, contact time of 90 min, 2 g cRH dosage and pH of 2 as the optimum conditions to achieve 91.48% removal efficiency. The optimized condition was verified and 91.13% removal efficiency was achieved. The experiment data fitted well to Langmuir model indicating anion species monolayer adsorption on the cRH homogeneous surface. Also, the process is in better agreement with pseudo-second-order kinetic model, indicating a chemisorption controlled process. Thus, the study revealed that cationic modified rice-husk is suitable for the removal of Cr(VI) from aqueous solution.

Graphene‐Oxide‐Coated, Polypyrrole‐Supported, Nano Zerovalent Iron Nanocomposites for Adsorption of Hexavalent Chromium from Wastewater

AbstractThe hexavalent chromium in water is extremely toxic to most living organisms and can cause many diseases. In this work, we developed Polypyrrole (PPy), Polypyrrole/graphene oxide (PPy/GO) nanocomposite, and Polypyrrole/graphene oxide/zerovalent iron nanoparticles (PPy/GO/n‐ZVI) nanocomposite for adsorption of Cr (VI) from water. PPy/GO nanocomposite showed the highest Cr (VI) removal capacity for 10 % (weight) loading of GO. PPy/GO/n‐ZVI nanocomposite showed the highest Cr (VI) adsorption capacity for 50 % iron nanoparticle loading. Chemical kinetics data showed that Cr (VI) adsorption occurred with pseudo‐second‐order. The maximum adsorption capacity (qmax) was found to be 64.29 mg/g, 129.09 mg/g, and 171.04 mg/g on PPy, PPy/GO nanocomposite, and PPy/GO/n‐ZVI nanocomposite respectively. The thermodynamic study showed a positive value of ΔS, and a negative value of ΔG indicated rise in the disorder at the adsorbate‐adsorbent interface and spontaneous nature of Cr (VI) adsorption. ΔH was close to 21 kJ/mole indicating adsorption process occurred via physisorption. The recycling of the adsorbent was carried out by washing with sodium hydroxide and Cr (VI) removal efficiency decreased by around twenty % in the fifth cycle. The present study suggests that the PPy/GO/n‐ZVI nanocomposite is an environment‐friendly magnetic material and provides a simple, low‐cost strategy for the adsorption of Cr (VI) from wastewater.

Using NH2-MIL-125(Ti) for efficient removal of Cr(VI) and RhB from aqueous solutions: Competitive and cooperative behavior in the binary system

The coexistence of inorganic and organic contaminants is a challenge for real-life water treatment applications. Therefore, in this research, we used NH2-MIL-125(Ti) to evaluate the single adsorption of hexavalent chromium (Cr(VI)) or Rhodamine B (RhB) in an aqueous solution and further investigate simultaneous adsorption experiments to compare the adsorption behavior changes. The main influencing factors, for example, reaction time, initial concentration, reaction temperature, and pH were studied in detail. In all reaction systems, the pseudo-second-order kinetic and Langmuir isotherm models were well illuminated the adsorption progress of Cr(VI) and RhB. Thermodynamic studies showed that the adsorption process was spontaneous and endothermic. As compared to the single system, the adsorption capacity of Cr(VI) in the binary system gradually decreased as the additive amount of RhB increased, whereas the adsorption capacity of RhB in the binary system was expanded brilliantly. When the binary reaction system contained 100 mg/L Cr(VI), the removal rate of RhB increased to 97.58%. The formation of Cr(VI)-RhB and Cr(III)-RhB complexes was the cause that provided facilitation for the adsorption of RhB. These findings prove that the interactions during the water treatment process between contaminants may obtain additional benefits, contributing to a better adsorption capacity of co-existing contaminant.

Adsorption of hexavalent chromium from water using graphene oxide/zinc molybdate nanocomposite: Study of kinetics and adsorption isotherms

Hexavalent chromium is one of the most hazardous contaminants that threaten the environment. The present research work involves the synthesis of Graphene Oxide/Zinc molybdate (GO/ZM) nanocomposite by wet chemical route. The structure and morphology of the synthesized samples were analysed by various characterization techniques such as X-Ray Diffraction (XRD), Fourier Transform Infrared Spectroscopy (FTIR), UV-Vis Spectroscopy, and High-Resolution Transmission Electron Microscopy (HR-TEM), Brunauer-Emmett-Teller (BET) surface area analysis, Barrett-Joyner-Halenda (BJH) pore size analysis and Raman Spectroscopy. The efficiency of the prepared samples for removing hexavalent chromium from the water was investigated by performing batch adsorption studies. The maximum adsorption capacity was optimum at using 6 mg adsorbent, under conditions pH 2 with contact time for 120 min and temperature 283 K. Two isotherm models and two kinetic models were used to study the adsorption mechanism of Cr(VI) ions adsorption on the surface of GO/ZM nanocomposite. The results of isotherm and kinetic modelling shows that the adsorption of Cr(VI) using GO/ZM nanocomposite was well described by Freundlich Isotherm model with higher correlation coefficient (R2 = .985) and follows pseudo second order kinetic model.

Nanocellulose/carbon dots hydrogel as superior intensifier of ZnO/AgBr nanocomposite with adsorption and photocatalysis synergy for Cr(VI) removal

A novel nanocellulose/carbon dots hydrogel (NCH) was fabricated using cellulose nanofibrils (CN), carbon dots (CD) and zinc oxide (ZnO)/silver bromide (AgBr) nanocomposite, where CD enhanced amino group-induced adsorption of hexavalent chromium (Cr(VI)) and promoted the photocatalytic properties of ZnO/AgBr nanocomposite via the transfer of photogenerated electrons, resulting in enhanced efficiency in the removal of Cr(VI) from aqueous solution. The structure, morphology, and physicochemical properties of the prepared NCH were characterized, with the results of adsorption and photocatalysis experiments showing the maximum theoretical adsorption capacity of the NCH to be 315 mg/g, 219 times that of the ZnO/AgBr nanocomposite; the apparent removal rate constant of the NCH was 0.0319 min−1, 11.7 times that of the ZnO/AgBr nanocomposite. Furthermore, the removal performance of NCH was attributed to CD-enhanced synergistic adsorption and photocatalysis effects, supported by characterization and experimental results. This work provides insight into the design and fabrication of a novel adsorptive photocatalyst with CD-enhanced synergistic adsorption and photocatalysis effects for removing Cr(VI) from aqueous solution.