Frontiers of Chemical Science and Engineering
·
2020
·Vol. 15
·期 3
·538-551
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IF 3.552
Deng Xiaoyan,Wang Luxing,Xiu Qihui,Wang Ying,Han Hong,Dai Dongmei,Xu Yongji,Gao Hongtao,Liu Xien
In this work, an adsorbent, which we call MnPT, was prepared by combining MnO 2 , polyethylenimine and tannic acid, and exhibited efficient performance for Cu(II) and Cr(VI) removal from aqueous solution. The oxygen/nitrogen-containing functional groups on the surface of MnPT might increase the enrichment of metal ions by complexation. The maximum adsorption capacities of MnPT for Cu(II) and Cr(VI) were 121.5 and 790.2 mg·g −1 , respectively. The surface complexation formation model was used to elucidate the physicochemical interplay in the process of Cu(II) and Cr(VI) co-adsorption on MnPT. Electrostatic force, solvation action, adsorbate-adsorbate lateral interaction, and complexation were involved in the spontaneous adsorption process. Physical electrostatic action was dominant in the initial stage, whereas chemical action was the driving force leading to adsorption equilibrium. It should be noted that after adsorption on the surface of MnPT, Cr(VI) reacted with some reducing functional groups (hydroxylamine-NH 2 ) and was converted into Cr(III). The adsorption capacity declined by 12% after recycling five times. Understanding the adsorption mechanism might provide a technical basis for the procedural design of heavy metal adsorbents. This MnPT nanocomposite has been proven to be a low-cost, efficient, and promising adsorbent for removing heavy metal ions from wastewater.
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高影响因子
CHEMICAL ENGINEERING JOURNAL
·
2025
·
IF 13.2
Li Song,Chunping Su,Hui Li,Huiping Zhao,Rong Chen
To achieve an effective and straightforward method for Cr(VI) removal from industrial wastewater, a composite Bi 2 S 3 /PDA/PEI material (BSPP) was successfully prepared through in-situ polymerization of polydopamine (PDA) followed by chemical grafting with polyethylenimine (PEI) on the surface of Bi 2 S 3 materials for round-the-clock highly efficient Cr(VI) removal from actual industrial electroplating wastewater. Under dark conditions, the maximum adsorption capacity of Cr(VI) by BSPP reaches 780.75 mg/g. Interestingly, when exposed to light, the maximum Cr(VI) removal capacity was further increased to 1333.21 mg/g. X-ray photoelectron spectroscopy (XPS) and inductively coupled plasma optical emission spectrometry (ICP-OES) analyses indicate that BSPP not only reduces Cr(VI) to Cr(III) under light condition, but also facilitates the significant decrease of total chromium content. Notably, under natural sunlight exposure outdoors, BSPP is capable of completely eliminating Cr(VI) from both plating cleaning solutions and waste plating solutions. More importantly, BSPP maintains its original Cr(VI) removal efficiency after nine cycles within plating cleaning solutions and six cycles within waste plating solutions. Large-scale testing results indicate that BSPP can effectively treat substantial volumes of electroplating wastewater to comply with national Cr(VI) discharge standards. These findings suggest that BSPP represents a promising material for continuous 24-hour Cr(VI) treatment in industrial electroplating wastewater.
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CHEMICAL ENGINEERING JOURNAL
·
2025
·
IF 13.2
Shuyu He,Shaohua Chen,Liwen Zhang,Shanyi Tan,Huizi Wen,Luyao Xi,Xiangru Zuo,Dongyun Du
Dissimilatory iron-reducing bacteria (DIRB) offer an eco-friendly approach to address nanoscale zero-valent iron (nZVI) surface passivation problem, yet their efficacy is limited by the slow direct extracellular electron transfer (EET) between DIRB and Fe(III) oxide passivation layers (Fe( III )OPL). This study demonstrates that natural dissolved humic substances (DHS)-mediated electron shuttling unlocking nZVI reactivity in Shewanella oneidensis MR-1 (MR-1) system for enhance Cr(VI) removal. Seven DHSs from diverse sources were evaluated, revealing that Cr(VI) removal rate constants ( k obs ) correlate strongly with DHS's quinone content (C=O) and electron transfer capacity (ETC), quantified as k obs = 1.66 C C = O − 9.39 ( P < 0.0007) and k obs = 19.37 ETC + 0.74 ( P < 0.0005). DHS-mediated systems achieve 2.0–12.1-fold higher k obs than nZVI/MR-1 alone. The enhancement mechanism of DHS-mediated Cr(VI) removal by nZVI/MR-1 is that DHS effectively facilitates Fe( III )OPL dissolution on the nZVI surface via electron shuttling, maintaining nZVI reactivity and amplifying Fe(II) generation by 1.65-fold. Moreover, DHS stimulates MR-1 to secrete more extracellular polymeric substances (EPS), enhancing Cr(VI) adsorption and reduction. This work elucidates DHS's dual role in maintaining nZVI activity and amplifying Cr(VI) removal by nZVI/MR-1, while establishing a predictive framework linking DHS molecular traits parameters to Cr(VI) removal kinetic, offering sustainable strategies for heavy metal-contaminated water bodies remediation by integrating biogeochemical and material engineering principles.
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CHEMICAL ENGINEERING JOURNAL
·
2026
·
IF 12.5
Luzi Yuan,Qingliang Zhao,Ruiyuan Xue,Liangliang Wei,Guangzhi Wang,Jing Ding,Junqiu Jiang,Kun Wang
Groundwater contaminated with toxic metals and petroleum hydrocarbons presents long-term risks due to the different transport and removal mechanisms of these contaminants. Co-occurrence of hexavalent chromium (Cr(VI)) and benzene (C 6 H 6 ) is particularly challenging, requiring combined redox transformation and hydrophobic adsorption for effective remediation. In this study, a porous and mechanically robust permeable reactive barrier (PRB) material, composed of sodium alginate, nanoscale zero-valent iron, and activated carbon (SA–nZVI–AC) was synthesized using a combined sol–gel and freeze-drying method. Unlike conventional nZVI systems that primarily focus on metal reduction, this composite integrates polymer stabilization, carbon adsorption, and iron-mediated redox for simultaneous removal of mixed metal–organic pollutants. Freeze-drying proved to be a key processing step, improving structural integrity, anti-clogging capacity, and thus long-term applicability of nZVI-based PRBs. Material characterization revealed a mesoporous framework, stabilized iron phases, and abundant oxygen-containing functional groups. Batch experiments demonstrated efficient simultaneous removal of Cr(VI) and C 6 H 6 , with adsorption kinetics following pseudo-second-order models ( k 2 values for total Cr and C 6 H 6 were 0.50 and 0.06 g mg −1 min −1 , respectively) and isotherms fitting the Langmuir model. Removal efficiencies exceeded 95.28% for Cr(VI) and 85.11% for C 6 H 6 at pH 7–9 and remained high (>78.15% and > 91.31%, respectively) under interfering ions. Column experiments confirmed sustained contaminant attenuation with breakthrough delayed to approximately 60 days. Cr(VI) was immobilized within the barrier through coupled adsorption and reduction, while C 6 H 6 was effectively retained via physical adsorption within the PRB matrix. Post-column microbial analyses suggested secondary biochemical interactions within the PRB. These results demonstrate that freeze-dried SA–nZVI–AC functions as a coupled adsorption–reduction–immobilization system, showing strong potential for long-term PRB applications in remediating groundwater co-contaminated with metals and organic compounds.
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APPLIED SURFACE SCIENCE
·
2026
·
IF 6.6
Ruijie Che,Yubo Pan,Yining Zhu,Xiaojing Long,Jining Li
Visible-light purification of contaminated waters is often constrained by rapid charge recombination and strong matrix interference, especially in complex real wastewaters. Here, we upcycled rice-noodle waste into carbon quantum dots (CQDs), and integrated them with ZnIn 2 S 4 to construct three-dimensional CQDs/ZnIn 2 S 4 nanoflowers. Optimising the CQDs loading at 3 wt% enabled the composite to remove 50 mg L −1 of pollutants within 120 min under visible irradiation, achieving 99.3% Cr(VI) reduction and complete methylene blue (MB) degradation with apparent first-order rate constants of 0.0192 min −1 (Cr(VI)) and 0.0223 min −1 (MB). The photocatalyst resisted matrix inhibition, with removals reaching 93.1% (Cr(VI)) and 91.6% (MB) in wastewaters, and above 95% in tap, lake and river waters; catalytic activity was retained above 95% after five reuse cycles. Valence-band X-ray photoelectron spectroscopy (VB-XPS) and density functional theory (DFT) band alignment analysis, together with transient photocurrent response, electrochemical impedance spectroscopy (EIS), photoluminescence (PL)and electron paramagnetic resonance (EPR) and radical-trapping experiments collectively verified an S-scheme CQDs/ZnIn 2 S 4 heterojunction with an interfacial built-in electric field that drives vectorial charge separation and preserves highly reductive electrons and oxidative holes at spatially distinct sites. This waste-to-resource strategy couples low-cost carbon precursors with interfacial band engineering to deliver a scalable, visible-light-driven platform for simultaneous detoxification of inorganic (Cr(VI)) and organic dye pollutants in realistic treatment scenarios.
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FUEL
·
2026
·
IF 7.8
Yongyi Zhang,Yupeng Lu,Lu Wang,Jiaqian Sun,Jinping Wang,Rui Yang,Chunling Zuo,Xiaoshuang Chen
To tackle the conversion and storage of extra renewable electricity and satisfy the ceaselessly expanding worldwide energy need, the craft of affordable and steady bifunctional electrocatalysts stands as vital. In this work, a FeCr co-doped Co(PO 3 ) 2 /NiCoP (FC-CPO/NCP) heterojunction electrocatalyst with self-supported 3D fibrous root system-like structure is successfully fabricated on nickel foam via a classic two-step hydrothermal-phosphatization approach. This fibrous root system-like nanostructure offers abundant porous channels and exposed active sites, which efficiently accelerate the electrolyte transport and enable the smooth proceeding of electrocatalytic reactions. Meanwhile, benefiting from its intrinsic interfacial composition and synergistic effect of dual metal doping, the FC-CPO/NCP catalyst facilitates the rapid electron transfer, optimizes the electronic structure and elevates the catalytic activity. Electrochemical characterizations verify that the as-prepared catalyst delivers appropriate bifunctional activities, showing the overpotentials of 225 mV for OER and 55 mV for HER at 10 mA cm −2 in alkaline electrolyte. When assembled as both electrodes into an electrolyzer for overall water splitting, the system achieves a current density of 10mA cm −2 at the cell voltage of 1.50 V and maintains robust stability over 72 h of continuous operation. This work provides an efficient and economical strategy for the rational design of high-performance electrocatalysts, thereby advancing the progress of sustainable energy conversion devices.
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Journal of Environmental Chemical Engineering
·
2026
·Vol. 14
·期 2
·122126
·
IF 7.5
Xiaojie Zhang,Keyi Liu,Zihan Zhang,Hong Peng,Yuefa Gong
Efficient and simultaneous removal of chromium(VI) oxyanions and heavy metal cations from complex electroplating rinse wastewater remains a major challenge. In this study, polyethyleneimine-chitosan/imidazolium-polysulfone composite beads (denoted as CSPF) were fabricated by integrating polyethyleneimine-modified chitosan powder (CSPI) with imidazolium-functionalized polysulfone (IMPSF) via a phase inversion method. The resulting CSPF beads was applied to simultaneously remove Cr(VI) and Cu(II) from simulated electroplating rinse wastewater. In a single-metal system at pH 5, CSPF exhibited maximum adsorption capacities of 89.3 mg g −1 for Cu(II) and 251.4 mg g −1 for Cr(VI). In the Cr(VI)/Cu(II) binary system, a notable co-removal synergy was observed, with adsorption capacities of CSPF increasing by 193.3% for Cu(II) and 39.7% for Cr(VI) compared to the single-metal system. The presence of other coexisting inorganic anions further significantly enhanced the adsorption of Cu(II) by CSPF. The promotion effect of different anions on Cu(II) adsorption follow the order of HCrO 4 − > H 2 PO 4 − ≈ SO 4 2 − >> NO 3 − ≈ Cl − . This trend is consistent with the extent to which they elevate the final solution pH and Cu 2p 3/2 binding energy after adsorption, and is further confirmed by DFT calculations. These results indicate that a unique electrostatic shielding–proton transfer synergistic mechanism is the key factor responsible for the synergistic co-removal of Cu(II) and Cr(VI) from complexed wastewater. Column cycling experiments demonstrated that CSPF could continuously and efficiently remove both Cu(II) and Cr(VI) from the simulated electroplating rinse wastewater, along with good reusability.
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POLYHEDRON
·
2026
·
IF 2.8
Meng Lan,Yubo Zhang,Xiaoli Dong,Nan Zheng
The development of flexible membrane-shaped photocatalysts with superior catalytic activity for the treatment of heavy metals in wastewater is of great significance, but it remains an extremely large challenge. In this work, atom co-sharing BiOBr/Bi 2 S 3 Z-scheme heterostructures were constructed in situ on flexible carbon fiber cloth substrate by combining solvothermal and ion exchange method. The prepared CFC/BiOBr/Bi 2 S 3 membrane-shaped photocatalyst exhibits good flexibility, water permeability and retrievability. After adsorption for 1 h and visible-light irradiation for 60 min, controllable and optimized synthesized CFC/BiOBr/Bi 2 S 3 –2 shows exceptional activity towards hexavalent chromium with the removal efficiency of 91%. The excellent reduction performance is attributed to the individual charge transport path of Z-scheme, which provides the driving force for photocarriers transport and excellent redox ability. In addition, the tight interfacial contact between BiOBr and Bi 2 S 3 by sharing bismuth atoms allows for rapid charge transfer and accelerates photogenerated carrier separation. This study provides some constructive insights for developing an immobilized membrane-shaped photocatalyst with excellent photocatalytic activity and easy recovery to treat chrome-containing wastewater, which has a promising application in the field of water remediation.
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MICROCHIMICA ACTA
·
2026
·Vol. 193
·期 6
·399
·
IF 5.4
Zhao Zewei,Huang Rui,Chen Yafei,Zhang Suni,Wei Xiaoping,Li Jianping,Wei XP,Li JP
A self-powered molecularly imprinted photoelectrochemical sensor was developed based on metal-complex imprinting for the determination of Cr 3+ in injection solutions. AgInS 2 /Ti 3 C 2 and CuInS 2 /Ti 3 C 2 Schottky heterojunction photoelectric materials were synthesized and used as the photoanode and photocathode, respectively. The complex formed by Cr 3+ and 8-hydroxyquinoline(Ox) (Cr-Ox) was used as a template molecule to prepare a molecularly imprinted polymer(MIP) film on the CuInS 2 /Ti 3 C 2 photocathode, constructing a dual-Schottky junction self-powered molecularly imprinted photoelectrochemical sensor for the first time. After being specifically recognized and adsorbed by the MIP, Cr-Ox exerts three synergistic effects. First, Cr-Ox acts as an electron trap, capturing photogenerated electrons and promoting charge carrier recombination, i.e. an electron trapping effect. Second, the cation exchange between Cr 3+ and Cu 2+ on the CuInS 2 photocathode surface generates photoinert Cu-Ox, leading to the cation exchange-induced passivation effect. Third, the physical blockage of incident light by Cr-Ox located within the imprinted cavities produces a light-blocking effect. The synergy of these three effects causes a sharp decrease in photocurrent. Taking advantage of this signal change, indirect determination of Cr 3+ was achieved with a detection limit of 7.64 × 10 –14 mol/L, demonstrating significantly higher sensitivity compared to other Cr 3+ detection methods. Furthermore, the selectivity of the sensor was improved by the MIP film, eliminating interference from common metal ions. The sensor has been applied to the determination of trace Cr 3+ in injection samples. Graphical The alternative text for this image may have been generated using AI.
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高影响因子
Journal of Environmental Chemical Engineering
·
2026
·Vol. 14
·期 2
·121761
·
IF 7.5
Bingkun Liu,Juncheng Guo,Siyuan Chen,Yinhan Yang,Beibei Liu,Hongda Huang,Jingtao Zhang,Yonghui Zhang
Highly efficient charge migration and separation are critical for the design of high-efficiency and stable photocatalysts. In our work, novel 2D/2D/2D g-C 3 N 4 /Ti 3 C 2 /SnS 2 heterojunctions were successfully prepared via a simple hydrothermal route combined with electrostatic self-assembly strategy. Compared to single-component (g-C 3 N 4 , SnS 2 ) and binary composite materials (g-C 3 N 4 /SnS 2 , g-C 3 N 4 /Ti 3 C 2 ), the optimized ternary g-C 3 N 4 /Ti 3 C 2 /SnS 2 composite displayed significantly enhanced photocatalytic efficiency and higher kinetic rate constants for the elimination of Cr(VI) and tetracycline (TC). More interestingly, further improved photocatalytic performance was achieved when the composite catalyst was applied to the mixed Cr(VI)/TC pollutant system, with the reaction rate constants being 1.46-fold and 1.06-fold higher than those of single Cr(VI) and single TC systems, respectively. Finally, a Z-scheme charge migration pathway was proposed in the 2D layered g-C 3 N 4 /Ti 3 C 2 /SnS 2 heterojunction, which enabled the expedited electron transfer between g-C 3 N 4 and SnS 2 with Ti 3 C 2 as an electron mediator and boosted the charge separation efficiency. The present work provides a viable way for constructing 2D/2D/2D Z-scheme heterojunction photocatalytic materials, offering great potential for the treatment of complex pollutants in wastewater.
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ENVIRONMENTAL POLLUTION
·
2023
·
IF 8.9
Dong Zhang,Danli Zhou,Li Lu,Ming Zhang,Ting Lü,Jingang Huang,Hongting Zhao,Jie Zhou,Jörg Rinklebe
Eradication of heavy metals and dyes simultaneously from wastewater is urgently needed to safeguard public and environmental health . In this study, magnetic porous biochar derived from wasted Myriophyllum aquaticum (MPMaB) was synthesized by KOH-activation and co–precipitation method to treat chromate and rhodamine B (RhB)-bearing wastewater. The KOH activation significantly improved the pore structure of biochar with a high specific surface area of 937.1 m 2 g −1 . The sorption performance of MPMaB for Cr(VI) and RhB in single and co-solutes conditions was evaluated. In single system, a pH-dependent sorption pattern for Cr(VI) by MPMaB was revealed and the estimated sorption capability reached 175.4 mg g −1 , whereas the Langmuir-based sorption capacity of RhB was 175.4 mg g −1 pH-independently. MPMaB partially transformed Cr(VI) to less toxic Cr(III) (approximately 59.3%). Synergistic sorption of Cr(VI) with the coexistence of RhB was observed, where synergistic effect ranged from 119% to 527% depending on pH. For example, the sorption capacity of Cr(VI) on MPMaB, at pH 2, augmented from 175.4 mg g −1 (single system) to 208.3 mg g −1 (binary system). Preferential sorption of Cr(VI) was found and was further confirmed by the post-sorption of Cr(VI) (or RhB) by MPMaB pre-sorbed with RhB (or chromate). Chromate sorption mechanisms mainly include electrostatic interactions and complexation, while the sorption of RhB is ascribed to π–π interactions, pore filling and hydrogen bonding. Additionally, MPMaB showed excellent reusability and maintained high removal efficiency after 5 cycles. In short, MPMaB can efficiently treat chromium and dyes–containing wastewater as sustainable and environmentally friendly adsorbent.
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高影响因子
Journal of Cleaner Production
·
2023
·
IF 11.1
Mingxin Li,Hongling Dai,Peng Zhan,Chaoqun Tan,Zhihui Ning,Fengping Hu,Xing Xu,Xiaoming Peng
Rapid reduction of aqueous Cr(VI) to Cr(III) with waste biomass N-doped lignin charcoals (PLCNx) as a catalyst via mediate oxalic acid (OA) for hexavalent chromium wastewater. The experiment results showed that the PLCN20 composite had the greatest capacity for removing Cr(VI), and the removal rate of Cr(VI) kept higher than 98% when the addition of 5 mM OA in the system. The bubble-shaped structures of PLCNx could act as an electron shuttle mediating the electron transfer and participate in the reduction of Cr(VI), and the N vacancies defects and graphitic N on its surface were a premise for initiating the Cr(VI) reduction process. More importantly, the formation of the Cr(VI)-OA complex facilitated electron transfer as well, which significantly enhanced Cr(VI) reduction. The combined effects of the electron-donating ability of OA and the catalysis of Cr(VI)-OA complex, lead to the enhancement of Cr(VI) reduction on the PLCNx. This work not only offers novel insights into the synthesis of a superior high-efficiency heterostructure for catalyst but also proposes one new mechanism of PLCNx activate OA enhanced catalysis capacity, which helps design and optimize the catalyst process.
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