Environmental Pollution Cleanup Research Articles

Transformation of waste into valuable materials: Utilizing waste printer powder to remove hazardous organic dye and pharmaceutical pollutants from wastewater

A global concern of considerable significance revolves around electronic waste and the contamination of water due to antibiotics and persistent organic dyes, leading to the emergence of antibiotic resistance and an alarming increase in environmental pollution. The substantial accumulation of waste printer powder generated by printers is undeniably an unwanted and valueless byproduct, as both its substantial production and recycling would result in significant financial burdens and environmental pollution challenges. Polypyrrole-grafted waste printer powder, (Ppy@wp), constitutes a viable solution due to its established reputation as a capable adsorbent. To maximize the reutilization of this waste powder, we have investigated a straightforward and practical approach for repurposing waste printer powder (wp) to craft a super magnetic Ppy@wp nanocomposite. This composite is put forth as a highly effective material for the elimination of methylene blue (MB) dye and tetracycline (TC) from solutions. The wp was mixed with pyrrole, followed by polymerization and carbonization to synthesize the final composite. The pollutant removal capacity of the as-prepared Ppy@wp nanocomposite has been evaluated by removing MB and TC. The Ppy@wp nanomaterial was found to be highly effective in removing 50 ppm of MB and TC with a removal rate of around 95.36% and 90.23%, respectively, within just 50 min. The Ppy@wp nanomaterial was evaluated for regeneration and desorption and it was shown to be effective for up to six cycles, with removal efficiency of TC being 79.23% and MB being 86.56%. This is a cost-effective, innovative, and highly efficient adsorbent process with a great perspective on environmental pollution clean-up. The result demonstrated that the synthesized material was magnetically separated from the solution within 2 min after adsorption. Therefore, this research has provided value-added significance for developing inexpensive composites from waste material to remove toxic chemicals from the waste stream.

Polyoxometalate-encapsulated metal-organic frameworks for photocatalytic uranium isolation.

Recycling uranium (U) via adsorption and controlled conversion is crucial for the sustainable development of nuclear energy, in which photocatalytic reduction of U(vi) from aqueous solutions is considered one of the most effective strategies. The primary challenge in the photocatalytic elimination of U(vi) resides in the demand for photocatalysts with exceptional properties for effective U(vi) adsorption and charge separation. Herein, we developed the hybrids of polyoxometalate@Cu-metal-organic frameworks (POM@Cu-MOFs) through a self-assembly strategy and demonstrated the efficient removal of U(vi) via synergistic adsorption and photocatalysis. The abundant oxygen-rich groups in POM served as the adsorption sites, endowing POM@Cu-MOFs with a remarkable removal capacity (1987.4 mg g-1 under light irradiation) to remove 99.4% of UO2 2+. The attraction of electrons from Cu atoms within Cu-MOFs effectively accelerated the carrier dynamics due to their pronounced electronegativity. A mechanism associated with the synergetic effects of adsorption and photocatalytic reduction of U(vi) was proposed. This work provides a feasible approach for efficiently eliminating U(vi) from aqueous solutions in environmental pollution cleanup using the POM@Cu-MOF photocatalyst.

Engineering a biofilters microbiome with activated carbon and bioaugmentation to improve stormwater micropollutant removal

Harnessing prokaryotes’ metabolic capacity and adaptive potential is of interest for environmental bioremediation and biological treatment of domestic and industrial waste. Bioaugmentation is commonly implicated in the cleanup of high-dosed environmental pollution. In this study, Arthrobacter aurescens TC1 was used to augment biofiltration systems for bioremediation of stormwater micropollutant. Bioaugmentation was tested on non-vegetated and vegetated system designs, with or without an adsorbent biocarrier [granulated activated carbon (GAC)]. This study investigated how system design affects microbial function and structure. It focused on long-term metabolic responses of the biofilter’s microbiome to low chronic exposure to the herbicide atrazine and fluctuations in atrazine load. Shotgun metagenomics analyses demonstrated that the major contributor to microbiome structure was the supplementation of GAC. Vegetation affected microbiome structure mainly in sand biofilter-media. GAC showed a significant shift in atrazine-degrading genes over time compared to sand. Diversity and richness increased with time in all system designs, regardless of atrazine load fluctuations. To conclude, incorporating GAC in stormwater-biofiltration systems effectively enhances the micropollutant-biodegradation capacity in stormwater with negligible effects on the biofilter’s microbiome diversity and function.

Fluorinated Poly(ionic liquid)s Coated Superhydrophobic Functional Materials with Efficient Oil/Water Separation Performance

There is an urgent need to develop new and improved oil-water separation materials with high stability and reusability for the cleanup of oily environmental pollutants. Here, fluorinated poly(ionic liquid)s were synthesized and their structure and property were characterized by nuclear magnetic resonance spectroscopy, Fourier transform infrared spectroscopy and thermogravimetric analysis. These fluorinated poly(ionic liquid)s were proposed as superhydrophobic coating on different metallic substrates through the combination of tethering fluorine groups in the PIL’s cation and anion exchange, and the superhydrophobic coating showed compactly stacked morphology under scanning electron microscope. The results of surface wettability experiments indicated that nearly all the fabricated materials showed a water contact angle larger than 150°, which is devoted to superhydrophobic nature. Moreover, for longer alkyl chain ILs and materials with smaller pore sizes, the water contact angle can be increased. At the same time, the fabricated superhydrophobic material exhibits a relatively high oil phase permeate flux, benefiting from the loose fibrous structure. Take the PIL@SSM300 for instance, the permeate fluxes were reached as high as 374,370 L·m−2·h−1, 337,200 L·m−2·h−1 and 302,013 L·m−2·h−1 for petroleum ether, hexane and cyclohexane, respectively. Instead, water is effectively repelled from the superhydrophobic surface. These virtues make the fabricated superhydrophobic material an effective membrane for oil/water separation under gravity. The separation efficiency and water contact angle are nearly unaffected after at least 20 cycles, confirming the excellent robustness of the coatings. These efficient poly(ionic liquid)s-based superhydrophobic materials possessed the potential to be used for oil/water separation.

Synthesis of porous carbon nanomaterials and their application in tetracycline removal from aqueous solutions

The low-cost and efficient elimination of tetracycline from wastewater and to decrease the concentration in soils, sediments, rivers, underground water, or lakes are crucial to human health. Herein, three-dimensional porous carbon nanomaterials were synthesized using glucose and NH4Cl by sugar-blowing process at 900 °C and then oxidized under air atmosphere for surface functional group modification. The prepared 3D porous carbon nanomaterials were applied for the removal of tetracycline from aqueous solutions. The sorption isotherms were well simulated by the Langmuir model, with the calculated sorption capacity of 2378 mg·g−1 for C-450 at pH = 6.5, which was the highest value of today’s reported materials. The porous carbon nanomaterials showed high stability at acidic conditions and selectivity in high salt concentrations. The good recycle ability and high removal efficiency of tetracycline from natural groundwater indicated the potential application of the porous carbon nanomaterials in natural environmental antibiotic pollution cleanup. The outstanding sorption properties were attributed to the structures, surface areas and functional groups, strong interactions such as H-bonding, π-π interaction, electrostatic attraction, etc. This paper highlighted the synthesis of porous carbon nanomaterials with high specific surfaces, high sorption capacities, stability, and reusability in organic chemicals’ pollution treatment.

Response surface optimization and modeling in heavy metal removal from wastewater-a critical review.

The existence of hazardous heavy metals in aquatic settings causes health risks to humans, prompting researchers to devise effective methods for removing these pollutants from drinking water and wastewater. To obtain optimum removal efficiencies and sorption capacities of the contaminants on the sorbent materials, it is normally necessary to optimize the purification technology to attain the optimum value of the independent process variables. This review discusses the most current advancements in using various adsorbents for heavy metal remediation, as well as the modeling and optimization of the adsorption process independent factors by response surface methodology. The remarkable efficiency of the response surface methodology for the extraction of the various heavy metal ions from aqueous systems by various types of adsorbents is confirmed in this critical review. For the first time, this review also identifies several gaps in the optimization of adsorption process factors that need to be addressed. The comprehensive analysis and conclusions in this review should also be useful to industry players, engineers, environmentalists, scientists, and other motivated researchers interested in the use of the various adsorbents and optimization methods or tools in environmental pollution cleanup.

Three-Dimensional Nano Polyaniline Modification Graphite Fiber as High-Capacity Electrode Material for Uranium (VI) Electrosorption

To improve the adsorption performance of graphite felt, aniline was directly polymerized on the surface of graphite felt by electrochemical method. The material test results showed that the electropolymerized polyaniline presented a three-dimensional nanofiber structure and the specific surface area of the electrode increased from 24.23 to 42.17 m2 g−1 after modification. The electrochemistry test results showed that the electrode had a large specific capacitance 144.6 F g−1 in 1 M NaCl at a sweep speed of 5 mV s−1. When pH = 4 and E = −0.9 V (vs SCE), the adsorption capacity of the electrode can reach 187.8 mg g−1. 94.6% adsorbed uranium can be eluted by 0.1 M hydrochloric acid. After 7 cycles, the performance loss was only 25%, which indicated that the electrode had a good regeneration performance. The uranyl ions combined with the amino and imino groups of polyaniline on the electrode surface, and were partially reduced to U (V), which greatly improved the adsorption capacity of electrode. All the results show that the electrode had exceptional potential applications in the extraction of U(VI) from aqueous solution, and it provides a feasible method for U(VI) environmental pollution cleanup in uranium mining and fuel processing.

Near real-time detection of blockages in the proximity of combined sewer overflows using evolutionary ANNs and statistical process control

Abstract Blockages are a major issue for wastewater utilities around the world, causing loss of service, environmental pollution, and significant clean-up costs. Increasing telemetry in combined sewer overflows (CSOs) provides the opportunity for near real-time data-driven modelling of wastewater networks. This paper presents a novel methodology, designed to detect blockages and other unusual events in the proximity of CSO chambers in near real-time. The methodology utilises an evolutionary artificial neural network (EANN) model for short-term CSO level predictions and statistical process control (SPC) techniques to analyse unusual level behaviour. The methodology was evaluated on historic blockage events from several CSOs in the UK and was demonstrated to detect blockage events quickly and reliably, with a low number of false alarms.

Methylene Blue Dye Photodegradation during Synthesis and Characterization of WO3 Nanoparticles

Semiconductor-based photocatalytic systems have found widespread use in environmental pollution cleanup and renewable energy production. In this study, we synthesized WO3 as a catalyst for the degradation of methylene blue, a thiazine dye, which was used in the previous work. The hydrothermal process is used to create WO3 nanoparticles, which are made from sodium tungstate. When it comes to confirming the nanoparticles, many characterization techniques are employed, including X-ray diffraction (XRD), Fourier transform infrared (FTIR), UV-Vis diffuse reflectance spectrometer (DRS), X-ray photoelectron spectroscopy (XPS), and field emission–scanning electron microscope (FE-SEM). The existence of monoclinic crystalline structure is shown by XRD, with the average crystalline size being around 34 nm. FTIR confirms the presence of metal oxides. The pellucid absorption extremity in the UV-Vis region corresponds to the rudimentary absorption of the WO3 semiconductor. FE-SEM confirms square-shaped nanoplates with EDX address the occurrence of elemental tungsten. The photocatalytic activity of WO3 nanoparticles against methylene blue is taken for at different intervals of time that confirms MB’s degradation. Our present work suggests that prepared nanoparticles should be potential for photocatalysts using various industrial dyes.

Augmentation of an Engineered Bacterial Strain Potentially Improves the Cleanup of PCB Water Pollution.

ABSTRACTPolychlorinated biphenyls (PCBs) are recalcitrant organohalide pollutants, consisting of 209 congeners. PCB cleanup in natural landscapes is expected to be achieved by the metabolic activity of microorganisms, but aerobic PCB-degrading bacteria that inhabit sites polluted by PCBs cannot degrade all PCB congeners due to the specificity of their enzymes. In this study, we investigated the degradability of PCBs when a genetically modified PCB-degrading bacterium was compounded with wild-type PCB-degrading bacteria. We used two bacterial strains, Comamonas testosteroni YAZ2 isolated from a PCB-uncontaminated natural landscape and Escherichia coli BL21(DE3) transformed with a biphenyl dioxygenase (BphA) gene from a well-known PCB degrader, Burkholderia xenovorans LB400. The enzymatic specificities of BphA were 2,3-dioxygenation in the YAZ2 and 2,3- and 3,4-dioxygenations in the recombinant E. coli. For the PCB-degrading experiment, a dedicated bioreactor capable of generating oxygen microbubbles was prototyped and used. The combined cells of the recombinant and the wild-type strains with an appropriate composite ratio degraded 40 mg/L of Kaneclor KC-300 to 0.3 ± 0.1 mg/L within 24 h. All of the health-toxic coplanar PCB congeners in KC-300 were degraded. This study suggested that the augmentation of an engineered bacterial strain could improve the cleanup of PCB water pollution. It also revealed the importance of the ratio of the strains with different PCB-degrading profiles to efficient degradation and that the application of oxygen microbubbles could rapidly accelerate the cleanup.IMPORTANCE PCB cleanup technique in a natural environment relies on the use of enzymes from microorganisms, primarily biphenyl dioxygenase and dehalogenase. Herein, we focused on biphenyl dioxygenase and created a recombinant PCB-degrading E. coli strain. Despite the development of environments for the field use of transgenic microbial strains around the world, verification of the applicability of transgenic microbial strains for PCB cleanup in the field has not yet been reported. We tentatively verified the extent to which degradability could be obtained by an augmentation model of a transgenic strain, the enzyme expression of which is easily regulated in rivers and lakes with PCB pollution. Our experiments used a dedicated bioreactor to model the natural landscape and produced results superior to those of bioremediation or biostimulation methods. The application of micro-nano bubbles, which has recently been discussed, to the cleanup of environmental pollution was also found to be useful in this study.

The impact of pollutant as selection pressure on conjugative transfer of dioxin-catabolic plasmids harbored by Rhodococcus sp. strain p52.

Plasmid-mediated bioaugmentation has potential application in the cleanup of recalcitrant environmental pollutants. In this study, we examined the influence of various contaminants (in different categories or different amounts) as a selection pressure on the spread of catabolic plasmids within an activated sludge bacteria community bioaugmented with Rhodococcus sp. strain p52 harboring pDF01 and pDF02. The distinguishable genera of transconjugants were isolated under the stresses of phenanthrene, dibenzothiophene, and dibenzo-p-dioxin. The three contaminants exerted different degrees of influence on the activated sludge bacteria bearing the catabolic plasmids. The relatively high ratios of transconjugant-bearing catabolic plasmids were detected in the reactor fed with dibenzo-p-dioxin. As dibenzo-p-dioxin from 10 to 80 mg/L was fed into the reactors, the ratios of transconjugant-bearing catabolic plasmids increased. Additionally, levels of ROS and extracellular LDH of activated sludge bacteria in the contaminants-fed reactors increased, comparing with that in the control reactor, indicating that the contaminants exerted toxicity which promoted the cell membrane permeability of the activated sludge bacteria. Our study provides a characterization of the recalcitrant contaminants as a selection pressure that can modulate catabolic plasmid transfer during genetic bioaugmentation for the removal of contaminants.

Phase transformation and structural evolution in iron oxide nanostructures

Nanostructured iron oxide (Fe2O3) have attracted considerable attention due to their unique physical properties, which are size and shape-dependent. In this article, hydrothermal & sol-gel methods have been opted for the growth of different nanostructures. Based on the choice of synthesis route, rhombohedral (α-phase) and cubic (γ-phase) shape of Fe2O3 are originated as confirmed from XRD and Raman measurements. HRTEM revealed the formation of different nanostructure of Fe2O3. Due to structural similarities with Fe3O4, cubic phase and smallest size (~ 12.3 nm) among all the samples, sol–gel derived γ-Fe2O3 nanocubes display maximum magnetization along with superparamagnetic behavior. Further, photocatalytic activity of prepared samples was screened for degradation of RB dye under UV light. The higher efficiency of nanoflowers compared to other structures may be ascribed to defects present in the nanostructure of catalyst. The present research indicates that nanostructures of Fe2O3 are highly efficient catalysts for the cleanup of environmental pollution.

Porous chitosan/biocarbon composite membrane as the electrode material for the electrosorption of uranium from aqueous solution

The radioactive pollution owing to the discharge of effluents containing radionuclides brings serious toxicological effects on the ecological environment. In this work, the chitosan (CS) and biomass-resourced porous activated carbons (BC) composite membranes (CS/BC) were used as the electrodes for the electrosorption of U(VI) from aqueous solutions. The capacitive characteristic and electrosorption performance of the composite electrodes was systematically investigated. The CV curves of the CS/BC membrane showed normal dependency of scan-rate and U(VI) concentration, reflecting good removal capacity and kinetic rate for U(VI) electrosorption. The CS: BC mass ratios had significant effects on U(VI) electrosorption performance, and the CS/BC-2 is the best among various CS/BC electrodes owing to its good match of functional groups and mesoporous structure. The CS/BC-2 presented high removal capability of for U(VI) electrosorption (207.6 mg/g at the voltage of 0.9 V and pH 4.0, based on Langmuir model). The electrosorption involves in electrical double-layer formation, ion-exchange, complexation and physisorption. The cyclic electrosorption-desorption results and the XPS characterization further clarified this mechanism. The CS/BC-2 could also selectively adsorbed U(VI) from other co-existed metal ions in electrosorption. The results revealed the potential application of electrosorption process by using CS/BC electrodes in U(VI) solution for the cleanup of environmental pollution.

Adsorption and reduction of Cr(VI) from aqueous solution using cost-effective caffeic acid functionalized corn starch

Herein, a potential bio-adsorbent (DACS-CA) was formed via immobilizing caffeic acid (CA) on dialdehyde corn starch (DACS) for Cr(VI) removal. The characterization techniques such as IR, Raman, XPS and 13C NMR were performed to analyze surface elements and functional groups on the as-prepared sorbents. Batch experiments revealed that the maximum Cr(VI) removal amount (96.45 mg/g) took place at a pH value of 3.0, adsorption temperatures of 333 K and solid-liquid ratio of 0.2. The isotherms studies found that the Cr(VI) removal of DACS-CA was monolayer adsorption, while the kinetics analysis revealed that chemisorption was the main power for removal process. Characterization analysis found that about Cr(VI) (53.02%) and Cr(III) (46.98%) species co-existed onto the surface of DACS-CA, which implied that a redox reaction may be occurred between Cr(VI) and the bio-adsorbent. Namely, Cr(VI) was first loaded on DACS-CA via electrostatic interaction, subsequently Cr(VI) was partially transformed into Cr(III) by reductive functional groups, meanwhile the resulting Cr(III) was immobilized by the carboxyl groups of DACS-CA. Thus, this bio-adsorbent could serve as an efficient sorbent for the removal of Cr(VI) from wastewater in environmental pollution cleanup.

Stable and highly efficient natural sunlight driven photo-degradation of organic pollutants using hierarchical porous flower-like spinel nickel cobaltite nanoflakes

Hierarchical porous flower-like spinel nickel cobaltite (NiCo2O4) nanoflakes was synthesized by using simple and economical chemical method. The structure, morphology and optical properties of synthesizes nanoflakes were analyzed by using XRD, FE-SEM and UV–visible. The NiCo2O4 nanoflakes showed 96% degradation of TBO in 50 min and after 10 cycles of operation, the photocatalytic activity was enough for the 89% degradation of TBO under natural sun light. When compared with other photocatalysts materials, porous NiCo2O4nanoflakes showed excellent thermal and chemical stability and offer exceptional electron transfer rate during photocatalytic reactions for real environmental pollution cleanup applications. The efficient photocatalytic efficiency and stability of NiCo2O4 nanoflakes is attributed to its inimitable structure with large surface area along with maximum active sites. This augments the efficiency of harvesting sun light, and spread active species over surface to decrease e-/h+ pair recombination. On the whole, this work demonstrates that the synthesis of nanoflower NiCo2O4 can be used as potential candidate to remove organic pollutant and infections from water under natural sun light irradiations for industrial applications.

Synthesis of a Novel Composite Hydrous Titanium Oxide- Hydroxyapatite for Adsorbing Uranium from Waste Effluents

In this paper; a novel composite (HAP@HTO)derived from hydrous titanium oxide (HTO) extracted from Rosetta ilmenite mineral and hydroxyapatite (HAP) was formed by co-precipitation method,specified and used for uranium preconcentration from its solutions. Batch tests were performed to investigate its selectivity towards uranium; maximum adsorption efficiency reached at pH 2.5, 120 minutes contact time, 900 mg L–1 uranium concentration and adsorbent ratio (0.1g/75 mL). The equilibrium data fitted well with Langmuir adsorption isotherm. From Kinetics and thermodynamics data; process was fast, fitted well with pseudo-second order, spontaneous and exothermic. The percentage desorption of uranium reached its maximal at 15 minutes equilibrium time using 1 mol L-1 H2SO4. Thereby, (HAP@HTO)composite has promising potential applications in extracting U (VI) from its aqueous solutions in nuclear fuel field and environmental pollution cleanup.

Judicious fabrication of bifunctionalized graphene oxide/MnFe2O4 magnetic nanohybrids for enhanced removal of Pb(II) from water

Novel ternary nanohybrids, bifunctionalized graphene oxide/MnFe2O4 magnetic nanoparticles (PEHA-Phos-GO/MnFe2O4), were prepared by a facile method and applied for the removal of Pb(II) from aqueous solution. Attributing to the numerous amino and phosphate groups on the bifunctionalized GO nanosheets as well as the magnetic nanoparticles of MnFe2O4, PEHA-Phos-GO/MnFe2O4 demonstrated high removal efficiency of Pb(II) and rapid magnetic separation. The 366.4 mg/g maximum adsorption capacity of Pb(II) on PEHA-Phos-GO/MnFe2O4 was obtained at the optimal adsorption pH of 5.5, much higher than that on GO (212.1 mg/g). The kinetics and isotherm data indicated that the adsorption processes can be well described by the pseudo-second-order kinetics and the Langmuir model. For the adsorption of Pb(II) on PEHA-Phos-GO/MnFe2O4, thermodynamic studies revealed the endothermic nature of the spontaneous adsorption process. The exhibited adsorption capacity, easy magnetic separation and reusability make the PEHA-Phos-GO/MnFe2O4 nanohybrids very promising adsorbents for efficacious removal of heavy metals from aqueous solutions in environmental pollution cleanup.

Computational insights into the sorption mechanism of polycyclic aromatic hydrocarbons by carbon nanotube through density functional theory calculation and molecular dynamics simulation

Potential for increased toxicity known for polycyclic aromatic hydrocarbons (PAHs) is associated with adverse effects on growth, reproduction and mutagenicity. Carbon nanotube (CNT) could significantly enhance PAHs sorption in aqueous solutions, which offers a promising opportunity in water and air purification for the removal of environmental contaminants. Although the sorption of PAHs by carbon nanotube has been reported in many studies, the knowledge regarding their molecular mechanism at atomic level is still very limited. In this study, we integrate density functional theory (DFT) calculation, fully atomistic molecular dynamics (MD) simulation and binding free energy calculation to investigate the sorption mechanism of PAHs by carbon nanotube. The results would have important implications for the future application of carbon nanotube in the environmental pollution cleanup.

Phytoremeditation: A Potential Tool for Waste Water Recycling

Plants can be used in the cleanup and prevention of environmental pollution. This relatively new and green technology that uses natural processes to break down, stabilize, or accumulate pollutants. Phytoremediation-related processes might amend the situation or chemical makeup of contaminants. Multidisciplinary studies will help to develop a better understanding of the ecological interactions that contribute to phytoremediation, the effects of phytoremediation on ecological relationships, and the movement of pollutants through ecosystems. Phytoremediation, requires careful choice of plant species and management practices are key to promoting ecological restoration and preventing pollutant dispersal. Native/local plant species with effective remediation properties should be used that provide natural hydraulic control and soil stabilization should be selected.

Chitosan modified molybdenum disulfide composites as adsorbents for the simultaneous removal of U(VI), Eu(III), and Cr(VI) from aqueous solutions

The potential coexistence of radionuclides and toxic metal ions is threatening the ecological environment. In this study, the chitosan modified molybdenum disulfide (CS/MoS2) was prepared by hydrothermal method for the simultaneous removal of U(VI), Eu(III), and Cr(VI). The removal capacities of CS/MoS2 in the single system were 0.71 mmol/g for U(VI), 0.86 mmol/g for Eu(III), and 3.04 mmol/g for Cr(VI) at pH 5.0. The simultaneous adsorption results indicated that the existence of U(VI) or Eu(III) could effectively improve the removal efficiency of Cr(VI). The trapping of Eu(III) decreased obviously in the presence of U(VI) or Cr(VI). The presence of Cr(VI) was beneficial to the retention of U(VI), while the presence of Eu(III) led to the decrease adsorption of U(VI). Based on the XPS characterization results, the retention of U(VI), Eu(III), and Cr(VI) on CS/MoS2 was mainly ascribed to the electrostatic attraction along with the hydroxyl and amidogen groups. The results revealed that CS/MoS2 composites were versatile and highly efficient for multiple pollutants elimination, which can be used for environmental pollution cleanup.