CHEMICAL ENGINEERING JOURNAL
·
2025
·
IF 13.2
Yifei Yin,Wenjun Zhou,Ming Zhang
A microscale zero-valent iron (mZVI) composite integrating surface phosphate (P) modification and lattice nitrogen (N) doping (NP-mZVI) was successfully fabricated by one-step mechanochemical method in aim to establish synergistic adsorption-reduction pathways for enhanced Cr(VI) removal. NP-mZVI demonstrated superior reactivity for Cr(VI) removal with 100% of both removal efficiency and conversion rate, which significantly outperform the pristine ball-milled mZVI bm and P-modified mZVI bm . Furthermore, NP-mZVI also exhibited excellent removal performance for a range of heavy metals (e.g., Ni(II), Pb(II), Cu(II), and Cd(II)), and was also demonstrated to be pH-universal, long-term stability, and environmental applicability. The strategic integration of lattice N doping and surface P coordination in NP-mZVI establishes a dual-path optimization mechanism for enhanced Cr(VI) removal. Surface P groups enable bidentate Cr(VI) complexation through ligand-specific recognition, reducing adsorption energy barriers while creating Fe-O-P mediate directional charge transfer. Concurrently, interstitial N doping induces lattice tensile strain via Fe Fe bond elongation, weakening metallic bonding networks to amplify electron liberation from the Fe 0 core. N facilitates electron release through strain engineering while P directs interfacial electron utilization. This synergistic coupling of core activation and surface mediation resolves the kinetic mismatch between electron supply and interfacial demand, achieving superior Cr(VI) removal efficiency through adsorption-reduction pathway integration. This study highlighting the synergistic effects of surface P modification and lattice N doping for mZVI in enhancing the reduction and removal of Cr(VI), and provides a new insight into rational design of modified mZVI with high reactivity.
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高影响因子
CARBOHYDRATE POLYMERS
·
2026
·
IF 13.2
Xiaohan Zhao,Yubin Huang,Zhenhong Huang,Hongzhi Liu
The hazards of aqueous Cr (VI) are severe, necessitating adsorbents with high capacity, applicability, and recyclability. In this study, a novel water-soluble cationic quaternary ammonium silsesquioxane (SQ-N) was synthesized and subsequently reacted with chitosan (CS), polyethylene glycol diacrylate (PEGDA), and pentaerythritol tetrakis (3-mercaptopropionate) (PETMP) to fabricate a flexible chitosan hybrid cryogel (PPSC-x (x = 1, 2, 3)) through UV cross-linking followed by freeze-drying. The resulting cryogel was comprehensively characterized using FTIR, XRD, TGA, SEM, EDS, and XPS analyses. The PPSC-x (x = 1, 2, 3) cryogel possessed abundant active sites and superior mechanical properties, rendering them suitable for the efficient removal of Cr (VI) from wastewater. The adsorption process was spontaneous and endothermic, achieving a maximum equilibrium adsorption capacity of 274 mg g −1 at 328 K. The adsorption of Cr (VI) followed a pseudo-second-order kinetic model and conformed to the Langmuir isotherm. PPSC-3 maintained >90% removal efficiency over five cycles and demonstrated notable antibacterial activity against Escherichia coli and Staphylococcus aureus . A prototype device further validated its practical potential for wastewater treatment.
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PubMed
高影响因子
WATER AIR AND SOIL POLLUTION
·
2023
·Vol. 234
·期 2
·1-13
·
IF 2.9
Wei Yaru,Zhang Kaili,Cheng Tiexin,Zhou Guangdong
In this paper, FeS m /BC composites were prepared using coconut shell biochar (BC) as the carrier. FeS m on FeS m /BC is preferentially oriented along the (001) crystal plane and exhibits a uniform honeycomb morphology. It has a high specific surface area and a small pore size distribution, which is more suitable as a heavy metal ion removal material. The results show that Cr(VI) can be almost completely removed within 120 min under acidic conditions with an initial concentration of 10 mg/L of Cr(VI), a temperature of 20 °C, and a dosage of 0.6 g/L of adsorbent. Where pH was the main factor influencing the removal of Cr(VI):pH affects Cr(VI) removal by changing the form of Cr(VI) in the solution, adsorption free energy, redox potential, charged species on FeS m /BC surface, and the reduction properties of Fe 2+ and S 2− , low pH value is more favorable for Cr(VI) removal. Coexisting anions in solution inhibit Cr(VI) removal due to competitive adsorption, but coexisting cations have no effect. The adsorption process of Cr(VI) by FeS m /BC follows the pseudo-second-order kinetics and Langmuir adsorption isotherm model, indicating that the adsorption process is a monolayer surface adsorption controlled by the chemical adsorption mechanism and involves electron sharing or exchange between adsorbent and adsorbate. Thermodynamic study shows that the adsorption process is a spontaneous entropy-increasing process, and raise the temperature is beneficial to the adsorption. The removal of Cr(VI) by FeS m /BC is the synergistic effect of adsorption, reduction, and co-precipitation.
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Surfaces and Interfaces
·
2022
·
IF 6.137
Yanfeng Huang,Yuliang Tu,Jinxiong Wu,Xiangjing Liang,Dongye Zhao,Patrycja Boguta,Xintai Su
Cr-contaminated soil is a serious threat to the ecological environment and human health because of its high toxicity of Cr(VI), and it needs to be treated properly. In this study, commercial humic acid (HA) was used as an extractant to treat high concentration of Cr contaminated soil (amorphous phase bound state), and the Cr(VI) removal rate was 90.55% under the optimal conditions (pH = 12, concentration 1 g/L, extraction time 24 h, liquid-solid ratio = 20:1). In this process, the remaining Cr species in the HA-treated soil was the most stable and the least mobile, with the highest retained native soil organic matter (SOM) compared to ethylenediaminetetraacetic acid (EDTA) and citric acid (CA). In addition, the economic cost advantage of HA was outstanding at only $55.3 per ton of soil contaminated with high concentrations of Cr(VI). Studies have shown that HA can be a "green" and more cost effective alternative to the traditional extractants EDTA and CA when targeting extraction treatments for high concentration Cr-contaminated soils and other Cr-containing wastes.
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高影响因子
Journal of Cleaner Production
·
2022
·
IF 11.072
Lu Zhang,Jianhao Qiu,Dingliang Dai,Yichen Zhou,Xi Liu,Jianfeng Yao
MIL-101(Cr)@ZnIn 2 S 4 hierarchical heterojunction was delicately designed and fabricated through the in-situ growth of ZnIn 2 S 4 on MIL-101 and electrostatic self-assembly. It is affirmed that the Cr–S interface bonding between MIL-101 and ZnIn 2 S 4 in their composite was established based on the characterization results of X-ray photoelectron spectroscopy, Raman and zeta potential . Thus, a high-speed channel for charges transfer is offered due to the Cr–S bond, intimate interface contact and hierarchical structure of MIL-101@ZnIn 2 S 4 , which largely inhibits the recombination of photo-induced charge carriers and promises a remarkable photocatalytic activity . Choosing visible-light-driven reduction of Cr(VI) as a model, the optimal MIL-101@ZnIn 2 S 4 sample can reduce 95% of Cr(VI) within 30 min, corresponding to a rate constant of 0.107 min −1 , which is 2.9-fold compared with blank ZnIn 2 S 4 counterpart (MIL-101 has a negligible performance). Additionally, a conspicuous apparent quantum yield of 9.7% can be achieved at a wavelength of 420 nm. Eventually, to reinforce the practicability of MIL-101@ZnIn 2 S 4 , the composite powders were manufactured as aerogels utilizing bacterial cellulose as a substrate. The MIL-101@ZnIn 2 S 4 aerogel still exerts an enviable performance for photocatalytic reduction of Cr(VI) and stability. This work could inspire the material design and environmental remediation based on MOFs.
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高影响因子
ENVIRONMENTAL RESEARCH
·
2022
·
IF 8.431
Shuoqi Ren,Yuchen Wang,Zijian Han,Qiwei Zhang,Chongwei Cui
A highly efficient absorbent was developed in this study by modifying polydopamine film on Mg–Al layered double hydroxide (PDA/MgAl-LDH) to remove Cr(VI) from wastewater. The characterization results showed that the polydopamine film was successfully coated on the MgAl-LDH surface. The preparation ratio, pH, and adsorbent dosage influencing absorption by PDA/MgAl-LDH were systematically investigated. The absorption capacity of Cr(VI) by PDA/MgAl-LDH was 87 mg/g. The equilibrium adsorption isotherm of PDA/MgAl-LDH was in good agreement with that of the Langmuir model. Therefore, the pseudo-second-order kinetic model is suitable for describing adsorption kinetics. The interaction between PDA and Cr(VI) and Cr(III) was investigated using density generalized function theory (DFT), which demonstrated that the PDA amino group could provide electrons for Cr(VI) reduction. Hydrogen and covalent bonding were dominant during the chemisorption process of PDA absorbing Cr(VI), the nitrogen of 5,6-dihydroxyindole was the primary active site for absorbing Cr(III), and electrostatic attraction was mainly responsible for Cr(III) absorption. Therefore, PDA/MgAl-LDH has the potential to adsorb and remove Cr(VI) from wastewater.
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高影响因子
JOURNAL OF HAZARDOUS MATERIALS
·
2021
·
IF 10.588
Renji Zheng,Jing Li,Runliang Zhu,Ranhao Wang,Xuezhen Feng,Zhijie Chen,Wenfei Wei,Dazhong Yang,Hong Chen
Wastewater with complex compositions of both heavy metals and organic pollutants is of critical environmental and socioeconomic threat worldwide, which urgently requires feasible remediation technologies to target this challenge. In this study, natural chalcopyrite (CuFeS 2 , NCP), the most abundant copper-based mineral in the Earth's crust , has been discovered to be a heterogeneous catalyst that can activate peroxydisulfate (PDS) for the simultaneous degradation of organic pollutant Rhodamine B (RhB) and reduction of hexavalent chromium (Cr(VI)). Batch experimental results indicate that both RhB and Cr(VI) could be simultaneously removed under a near-neutral condition in NCP/PDS combined system. The radicals SO 4 •− and • OH generated from PDS activation are the main oxidative species detected by electron paramagnetic resonance (EPR) spectroscopy. SO 4 •− acted as a predominant role in RhB degradation, while Cr(VI) reduction is mainly attributed to the oxidization of S 2− and S 2 2− species on NCP surface, as well as the photoreduction performance of NCP, which could be enhanced by the intermediates generated from RhB degradation. Density functional theory (DFT) calculation results disclose that Fe is the critical catalytic site for PDS activation. This work demonstrates a user-friendly strategy for remediation of complex wastewater containing both heavy metal and organic pollutants by combining photoreduction and advanced oxidation processes (AOPs) with natural minerals. It paves a way for wastewater treatment by utilizing low-cost natural abundant minerals as catalysts.
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PubMed
高影响因子
CERAMICS INTERNATIONAL
·
2022
·
IF 5.532
Hongfei Yin,Chunyu Yuan,Huijun Lv,Kaiyue Zhang,Xue Chen,Yongzheng Zhang
Environmental crisis aroused from the Cr(VI)-containing wastewater has received much attention, due to the cancer-causing and mutagenic feature of Cr(VI). Photocatalytic technology has been considered to be a favorable contestant for coping with Cr(VI)-containing effluent. In this study, Ti 3 C 2 MXene/Zn 3 In 2 S 6 Schottky junctions with different content of Ti 3 C 2 MXene were prepared for Cr(VI) photoreduction. The inherent physical and photoelectrochemical characters of the obtained Ti 3 C 2 MXene/Zn 3 In 2 S 6 Schottky junctions were fully characterized. Compared with the pure Zn 3 In 2 S 6 , all the nanocomposites showed enhanced photocatalytic performance, the apparent kinetic constant of the optimized sample was 3.17 times the height of the Zn 3 In 2 S 6 . The improved photoreduction performance largely originated from the effectual separation and transfer of the photoexcited charge carriers. In the meantime, the deleterious role of superoxide radicals for Cr(VI) photoreduction was confirmed. It is anticipated this research can deliver a new-fangled vision for constructing efficient photocatalyst for Cr(VI) photoreduction.
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Water Science and Engineering
·
2021
·
IF 0
Li Yin,Na Mi,You-ru Yao,Jing Li,Yong Zhang,Shao-gui Yang,Huan He,Xin Hu,Shi-yin Li,Li-xiao Ni
Ferrous sulfide (FeS) nanoparticles constitute an effective hexavalent chromium (Cr(VI)) treatment reagent. However, FeS nanoparticles aggregate easily, significantly limiting their engineering applicability. To overcome this shortcoming and further improve Cr(VI) removal efficiency, this study used tannic acid (TA) to modify FeS nanoparticles. The results demonstrated that TA-modified FeS nanoparticles, TA-nano-FeS, had a significantly reduced tendency to agglomerate, and maintained particle diameters of 10–100 nm, which were much shorter than diameters of FeS nanoparticles. In addition, TA-nano-FeS could combine the surface-active functional groups of TA. The maximum removal capacity of TA-nano-FeS was 381.04 mg/g, which was 2.92 and 1.83 times higher than those of TA and nano-FeS, respectively. Furthermore, the acidic condition was more beneficial for Cr(VI) removal, and the coexisting cations (Ca 2+ and Mg 2+ ) slightly decreased the removal efficiency of Cr(VI). Adsorption, reduction, and co-precipitation were the removal mechanisms, and the reaction products included FeCr 2 O 4 , Cr 2 O 3 , Fe 2 O 3 , Cr(OH) 3 , and S 8 . The results provided valuable information for the practical application of TA-nano-FeS in Cr(VI) removal.
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Journal of Environmental Chemical Engineering
·
2021
·
IF 5.909
Xian Zeng,Yuchen Wang,Xinyi He,Caocong Liu,Xi Wang,Xinpeng Wang
Being one of the most toxic pollutants commonly present in wastewater as soluble hexavalent chromium (Cr(VI)) specie, its concomitant adsorption and chemical reduction to relatively insoluble and less poisonous Cr(III) would be an effective strategy for remediation of Cr-polluted water. As such, a novel MXene-polyelectrolyte nanocomposite was typically synthesized for enhanced Cr(VI) removal. In detail, we applied polyethylenimine (PEI) to modify the Ti 3 C 2 T x surfaces and synthesized Ti 3 C 2 T x /PEI nanocomposites. The as-prepared composites were characterized by various methods such as SEM-EDX, N 2 sorption-desorption isotherm, XRD, FTIR, and XPS. Further, the Ti 3 C 2 T x /PEI was used to adsorb Cr(VI) for clarifying the kinetics, isotherms, and the effects of solution pH and coexisting ions on Cr(VI) removal by batch experiments. Our results show that coating of Ti 3 C 2 T x nanosheets with PEI regulates surface charge of the as-synthesized adsorbent and creates it with a three-dimensional network, allowing the fast electrostatic adsorption of Cr(VI) anions to positively charged surface over wide pH range of 1–10 and promoting to achieve improved removal capacity maximum up to 186.5 mg/g. The Cr(VI) adsorption data were well fitted by the pseudo-second-order kinetic and Langmuir isotherm models. In addition, Ti 3 C 2 T x /PEI also exhibits excellent selectivity for Cr(VI) anions over competing ones such as NO 3 − , Cl − , ClO 4 − , and SO 4 2− . Time-dependent reaction routes of Ti 3 C 2 T x /PEI nanocomposite toward Cr(VI) was studied by XPS, which confirmed the slow reduction of all sorbed Cr(VI) to Cr(III) in the dozens of hours and final in-situ Cr(III) immobilization, clarifying the sorption-reduction mechanism for Cr(VI) elimination. All these results suggest that Ti 3 C 2 T x /PEI nanocomposite prepared by reported surface-modification approach available for developing other functionalized adsorbents, may be a potential candidate for decontamination of Cr(VI)-polluted wastewater.
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SENSORS AND ACTUATORS B-CHEMICAL
·
2021
·
IF 7.46
Cuijuan Wang,Ming Shang,Haiyan Wei,Mengping Zhang,Wei Zou,Xiao Meng,Wenwen Chen,Hua Shao,Yongchao Lai
Hexavalent chromium (Cr(VI)), a highly toxic heavy metal ion , poses a serious threat to human health, and the demand of rapid detection still on-going. Herein, we propose a surface-enhanced Raman spectroscopy (SERS)-based method for rapid and cost-effective quantification of Cr(VI) in aqueous solutions with direct signal of Cr(VI) rather than indirect signals of Raman reporter molecules exploited in previous studies. This method demonstrates high sensitivity (the detection limit of 0.72 ppb), high reproducibility (the batch-to-batch variation was less than 10 %), and excellent selectivity. The results of this proposed method are fairly in good agreement (R 2 = 0.991) with those of the UV colorimetric method promulgated by the United States Environmental Protection Agency (USEPA). We demonstrated the potential of our novel method for practical application in determining Cr(VI) concentrations in drinking and environmental water samples, in which adequate recovery, and high interference resistance were observed. This method has the advantages of being faster and suitable for on-site inspection as no pretreatment process is required and the equipment is portable. The excellent performance promises a great prospective toward a rapid, reliable, and on-site detection for Cr(VI).
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JOURNAL OF APPLIED POLYMER SCIENCE
·
2021
·Vol. 138
·期 27
·50642
·
IF 3.125
Zhimei Wei,Shouyu Zhang,Xiaojun Wang,Shengru Long,Jie Yang
Cr (VI) is a highly toxic pollutant to humans, to achieve high adsorption capacity, easy recovery, and good reusability, polyethersulfone/polydopamine (PES/PDA) ultrafine fibers were prepared successfully. A series of preparing effect factors were investigated systematically and the optimum one is 8.5 pH value at room temperature and 2 g/L dopamine concentration. And then they were used as an adsorbent for the removal of Cr (VI) ions from wastewater. The effect factors pH, the adsorbent dosage, and time were discussed on Cr (VI) adsorption process and the Cr (VI) adsorption behavior was investigated. It is found that the maximum Cr (VI) adsorption capacity is 115.2 ± 4.8 mg/g at pH = 3 using 0.06 g PES/PDA with 80 mins. The Cr (VI) adsorption process followed the pseudo-second-order model (r 2 ≥ 0.99) and adsorption isotherms were fitted to the Langmuir model (R 2 ≥ 0.999). Furthermore, the Cr (VI) adsorption mechanism was supposed according to the X-ray photoelectron spectroscopic results. Finally, PES/PDA ultrafine fibers were considered to be a promising adsorbent with good stability (decomposing temperature, 356°C), high adsorption efficiency (112.1 ± 2.5 mg/g), and good reusability (three times) on the coexistence of anions and the actual industry wastewater environment.
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高影响因子
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