JOURNAL OF PHOTOCHEMISTRY AND PHOTOBIOLOGY A-CHEMISTRY
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2026
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IF 4.4
Guanghui Chen,Bolin Li,Zhiguang Xue,Hong Liu,Jiayao Chen,Lei Zhang,Xinguo Xi,Lanqin Tang,Yong Zhou
Constructing well-defined MOF/COF heterostructures that integrate pollutant enrichment with efficient interfacial charge separation remains challenging, as intimate interfacial contact may compromise framework integrity. Herein, an ultrathin TPA-COF/UiO-66-NH₂ heterostructure is fabricated via interfacial self-assembly of exfoliated TPA-COF nanosheets, forming a conformal COF coating while preserving the crystallinity and microporosity of UiO-66-NH₂. Microscopic, thermogravimetric, and nitrogen sorption analyses reveal a continuous ultrathin COF layer with a low yet quantifiable loading (~1.5 wt%) and a BET surface area comparable to that of the pristine MOF. Compared with the individual components and their physical mixture, the assembled heterostructure exhibits markedly enhanced photocatalytic Cr(VI) reduction, highlighting the importance of controlled interfacial integration. Comparative adsorption studies, kinetic modeling, and pH-dependent experiments indicate that Cr(VI) enrichment is closely associated with surface-charge-mediated interactions of the amine-functionalized framework. Suppressed photoluminescence, enhanced photocurrent response, and radical scavenging experiments are consistent with improved interfacial charge separation, with photogenerated electrons serving as the dominant reductive species. Band-edge analysis further suggests a staggered energy alignment that is energetically favorable for interfacial carrier transfer. These findings illustrate how combining functional-group-mediated enrichment with controlled interfacial assembly can cooperatively influence adsorption and charge-transfer processes in MOF/COF heterostructures.
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JOURNAL OF HAZARDOUS MATERIALS
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2026
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IF 10.6
Haoran Hu,Guoyan Dang,Jiahe Shi,Junhao Cui,Shu Zhou,Yanrong Zhang
The reaction between hexavalent chromium (Cr(VI)) and sulfite (S(IV)) holds promise for water decontamination but intrinsically favors a non-radical pathway, leading to toxic Cr(V) accumulation and inefficient radical yields. Herein, we constructed a heterogeneous carbon/Cr(VI)/S(IV) advanced oxidation system using carboxyl-rich carbon materials (CP-T and MWCNTs-COOH) to steer the reaction toward a radical-dominated pathway. Combined experimental and theoretical analyses unravel a surface-mediated ligand-exchange activation mechanism. Surface carboxyl groups function as specific anchoring sites, undergoing ligand exchange with Cr(VI) species to form a reactive Carbon-COO-Cr(VI) intermediate. Concurrently, the highly conductive carbon framework serves as an efficient electron conduit, facilitating rapid interfacial electron transfer from S(IV) to the anchored Cr centers. A dual-descriptor kinetic model was established, quantitatively demonstrating that the catalytic turnover is governed by a symmetric co-limitation regime; the intrinsic catalytic activity of the carboxyl sites is non-linearly amplified by the enhanced electron transport capability of the carbon network. This synergistic interplay simultaneously achieves complete Cr(VI)-to-Cr(III) detoxification and efficient sulfate radical (SO 4 •− ) generation. Furthermore, density functional theory (DFT) calculations elucidated the SO 4 •− -initiated degradation pathways for diclofenac (DCF). Operating efficiently in authentic water matrices under near-neutral conditions, this work provides a scalable and sustainable strategy for the synergistic remediation of complex metal-organic co-contamination.
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高影响因子
CHEMICAL ENGINEERING JOURNAL
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2026
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IF 12.5
Ziming Xin,Chendao Ruan,Jing Wang,Yuejin Zhang,Jiyan Shi
Fe/Mg co-modified biochar enabled simultaneous PFAS adsorption and Cr(VI) reduction–immobilization. • Acid-washed Fe₄Mg₁-NBC showed enhanced removal, pore accessibility, and regenerability. • Experiments and DFT confirmed hierarchical pores, bimetallic sites, and interfacial synergy as key mechanisms. Simultaneous removal of per - and polyfluoroalkyl substances (PFAS) and hexavalent chromium (Cr(VI)) from water remains challenging because of their divergent adsorption, redox, and interfacial behaviors. Herein, Fe/Mg co-modified N-doped biochar (Fe₄Mg₁-NBC) was fabricated through a hydrothermal synthesis strategy followed by pyrolysis and acid washing for the synergistic remediation of PFAS/Cr(VI) co-contaminated water. The optimized Fe/Mg ratio regulated the pore architecture and surface chemistry, producing a hierarchically porous, partially graphitized carbon matrix enriched with oxygen-containing groups and highly dispersed Fe–O/Mg–O active sites. Fe₄Mg₁-NBC exhibited superior removal performance toward PFOA, PFOS, PFBA, PFBS, and Cr(VI) in both single-solute and binary systems, with favorable adsorption under weakly acidic conditions and moderate temperatures. Acid washing further improved performance by eliminating inactive residues, opening blocked pores, and exposing additional active sites, while more than 90% of the initial adsorption efficiency was retained after five regeneration cycles. XPS analysis revealed Fe 2+ /Fe 3+ transformation and Metal–F interactions, indicating that Cr(VI) removal proceeded through Fe-mediated reduction followed by Cr(III) immobilization, whereas PFAS uptake involved electrostatic attraction, coordination, hydrophobic interaction, and pore filling. DFT calculations further demonstrated that Fe/Mg co-doping markedly enhanced PFAS adsorption affinity, decreasing the adsorption energy from +0.43 eV on pristine biochar to −1.24 eV on Fe/Mg-NBC. Co-adsorption configurations also suggested that Fe and Mg sites provided complementary functions for Cr(VI) activation and PFAS stabilization in mixed systems. These findings establish Fe₄Mg₁-NBC as a reusable multifunctional adsorbent for efficient treatment of PFAS/Cr(VI)-contaminated water. Download: Download high-res image (167KB) Download: Download full-size image
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JOURNAL OF PHOTOCHEMISTRY AND PHOTOBIOLOGY A-CHEMISTRY
·
2026
·
IF 4.4
Bingkun Liu,Juncheng Guo,Ziyang Liang,Yuhan Yang,Beibei Liu,Bing Han,Yonghui Zhang
NH 2 -MIL-101(Fe)/few-layer Ti 3 C 2 Schottky heterojunctions are constructed. • NH 2 -MIL-101(Fe)/Ti 3 C 2 composite shows higher photocatalytic activity for Cr(VI) removal. • The Schottky heterojunctions boost the separation of photogenerated charges. • The photogenerated electrons and •O 2 − dominate the Cr(VI) reduction process. The limited charge transfer efficiency of single-component semiconductor photocatalysts remains a critical bottleneck restricting the photocatalytic elimination of harmful pollutants. Here, NH 2 -MIL-101(Fe) nanoparticles are anchored onto few-layer Ti 3 C 2 nanosheets via electrostatic self-assembly to construct NH₂-MIL-101(Fe)/Ti 3 C 2 heterostructure. The few-layered 2D Ti 3 C 2 supplies abundant adsorption and catalytic active sites. Furthermore, benefiting from the Schottky junction and the superior conductive feature of Ti 3 C 2 MXene, the separation and transport of photoinduced carriers are remarkably promoted in the NH 2 -MIL-101(Fe)/Ti 3 C 2 . Accordingly, the optimized NH 2 -MIL-101(Fe)/Ti 3 C 2 –10% sample can remove 95.7% of Cr(VI) after 150 min of visible-light irradiation and still exhibits favorable reusability after three cycles. The electrons and •O 2 − are confirmed as the primary active species driving Cr(VI) reduction. Combined with comprehensive characterizations, a plausible photocatalytic mechanism of Cr(VI) reduction is put forward. This work offers fundamental guidance for developing MXene-based Schottky heterostructures toward improved photocatalytic activity.
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高影响因子
SEPARATION AND PURIFICATION TECHNOLOGY
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2026
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IF 9.1
Umer Hayat,Shafuq Abbas,Qingcai Yu,Yifan Chai,Defeng Kong,Xinyang Huang,Xing Chen
Nowadays, heavy metals are a major issue worldwide, polluting natural resources. In the given study, a novel approach was developed; commercial coconut shell activated carbon was modified with Fe 3 O 4 and thiourea (CH 4 N 2 S) to adsorb Cr(VI) and Ni(II) from industrial wastewater under photochemical reaction on a signal platform. The Cr(VI) reduction-adsorption rate was approximately 95% (2.91 mg/L), which was investigated under acidic conditions (pH = 2) with a 40 mg dose of adsorbent. The same phenomenon was observed for Ni(II) adsorption, approximately 91% (3.98 mg/L) at pH = 6 for 60 min, using the same adsorbent dose. The increased removal efficiency is attributed to the synergetic behavior of Fe₃O₄ and thiourea, where the Fe₃O₄ endorsed the reduction-adsorption of Cr(VI) while thiourea functional groups ( NH₂ and C S) endorsed the adsorption of Ni(II) with strong coordination of active sites along with surface complexation and electrostatic interactions. Analysis indicated the breakage of the activated carbon structure after the Cr(VI) adsorption. To get insights into the adsorption mechanism, Density Functional Theory calculations were performed to optimize structure, showing the stability of metal and surface complexes. FMO analysis demonstrates a reduction in the HOMO-LUMO energy gap from 2.95 eV (CSAC) to 0.17 eV (CSAC@Fe₃O₄@TU & metal), indicating increased surface reactivity and charge transfer. While NCI and RDG calculations further confirm the electrostatic attraction and bonding of Cr(VI) and Ni(II). This study presents a novel approach to conducting comparative studies under photochemical reactions. The CSAC@Fe 3 O 4 @Tu is a low-cost, green catalyst that was used for the remediation of environmental pollutants.
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Science China-Technological Sciences
·
2025
·Vol. 68
·期 11
·1-10
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IF 4.9
Guo Jia,Xu Jiaqi,Zhang Xiangwei,Li Zhengmao,Liu Fuyang,He Lei,Long Mingce,Tong Meiping
The rapid aggregation and sedimentation, the high toxicity towards bacteria, and the passivation of surfaces hinder the application of zero-valent iron (ZVI) particles in groundwater remediation. To overcome the shortages, ZVI particles were modified using oxalic acid (an environmental-friendly low-molecular-weight organic acid) together with xanthan gum (a safe and cost-effective high-molecular-weight polymer). We found that ZVI modified with both oxalic acid and xanthan gum exhibited superior Cr(VI) removal performance than those modified solely with oxalic acid and unmodified ZVI. Due to the reduced Fe 2+ release, the toxicity towards Escherichia coli by oxalic acid-xanthan gum modified ZVI was greatly inhibited. Via enhancing electrostatic repulsion through increasing the negative zeta potentials, modification of ZVI by oxalic acid and xanthan gum improved the dispersion of ZVI and reduced their sedimentation in suspension. Moreover, the mobile performance of ZVI in porous media was greatly improved by the modification with oxalic acid and xanthan gum due to the enhanced electrostatic repulsive interaction between ZVI and quartz sand. The observations held true in actual groundwater samples without and with heavy metal contamination. Clearly, the modification of ZVI by using oxalic acid and xanthan gum could be a feasible approach to enhance the practical application potential for the in-situ decontamination of groundwater.
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Petroleum Science
·
2026
·
IF 6.1
Mu-Fan Niu,Qi-Yu Sun,Yu-Hang Tan,Hai-Tao An,Han Yang,Ying Cui,Chun-Ming Xu,Bao-Jian Shen
In the field of ethane conversion, Cr/ZSM-5 catalysts have received considerable attention for application in direct dehydrogenation (DH) and CO 2 -assisted oxidative dehydrogenation (CO 2 -ODH) reactions, which can be attributed to their excellent catalytic performance. Nevertheless, the speciation of Cr on the catalyst surface within these two reaction systems, as well as the mechanisms accounting for the observed differences in catalytic performance between them, have been scarcely reported. Here, we present a comparative study on the catalytic performance and reaction mechanism of chromium oxide-loaded high-silica ZSM-5 catalysts in two ethane transformation systems: DH and CO 2 -ODH. DFT calculations reveal that the adsorption energy of ethane in the CO 2 -ODH system is lower than that in the DH system, indicating that the introduction of CO 2 can facilitate ethane adsorption on the catalyst surface. Experimental and computational results demonstrate that the catalysts exhibit high activity and stability in the CO 2 -ODH process, achieving an ethane conversion of 51.35 mol% and an ethylene yield of 44.05 mol%. No catalyst deactivation was observed over a 48-hour reaction period. Catalysts were characterized before and after the reaction using XRD, N 2 adsorption-desorption, SEM, H 2 -TPR, XPS, laser Raman, and UV-Vis. It is revealed that the superior catalytic performance of the catalysts in CO 2 -ODH compared to DH is primarily attributed to the introduction of CO 2 . Specifically, CO 2 promotes the redox cycle of Cr species during the catalytic reaction, maintains a higher proportion of Cr 6+ in the catalysts, and enhances the dispersion of Cr on the support surface. This work is expected to provide new insights into the effects of CO 2 on Cr species in CO 2 -ODH reaction system.
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ACS Sustainable Chemistry & Engineering
·
2017
·
IF 5.951
Peng Yu,Han-Qing Wang,Rui-Ying Bao,Zhengying Liu,Wei Yang,Bang-Hu Xie,Ming-Bo Yang
Sponge-like chitosan (CS)/reduced graphene oxide (rGO)/montmorillonite (MT) porous composite hydrogels were synthesized with a facile strategy of in situ reduction of graphene oxide (GO) without cross-linking of CS. Integral pore structure can be formed in the hydrogels when proper amount of MT was introduced. The composite hydrogel can restore to the original shape and dimension after compressive deformation like a sponge and show good stability in acid condition. Batch equilibrium measurements on the composite porous hydrogel were carried out to optimize the parameters for the removal of hexavalent chromium ions (Cr(VI)). The results reveal that the Cr(VI) ion sorption of the composite hydrogels is highly pH dependent and is the most effective at pH = 2. The sorption capacity increases with increasing temperature and the maximum Cr(VI) uptake of the composite hydrogel is 87.03 mg/g at 288 K. The sorption follows pseudo-second-order kinetic model and Langmuir isotherm. The composite porous hydrogels can be repeatedly used as adsorbent and a high sorption capacity after repeated usage can be maintained. Such an in situ GO reduction strategy can also be used to fabricate a variety of porous 3D polymer/rGO-based nanocomposites for biomaterials, energy storage materials, and adsorbent materials.
研究领域:
环境科学
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材料科学
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水处理
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纳米复合材料
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吸附技术
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JOURNAL OF CHROMATOGRAPHY A
·
2026
·
IF 4
Lin Lv,Hongmei Liu,Tao Song,Yan Zhao
Given the extensive use of amphenicol antibiotics and their potential adverse effects on human health, the development of simple and highly sensitive detection methods is essential to ensure food safety. In this work, a novel and highly efficient magnetic sorbent based on β-cyclodextrin-modified magnetic multi-walled carbon nanotubes functionalized with MIL-101(Cr) (Fe 3 O 4 @β-CD@MWCNTs@MIL-101(Cr)) was developed and combined with ultra-high-performance liquid chromatography-mass spectrometry (UHPLC-MS/MS) to achieve highly sensitive detection of three amphenicol antibiotics (chloramphenicol, thiamphenicol, and florfenicol) in honey samples. The key factors influencing extraction efficiency in the magnetic solid-phase extraction process were identified using the Plackett-Burman experimental design, whereas the optimal experimental conditions were determined through Box-Behnken design-based response surface methodology optimization. Under these optimized conditions, favorable linear relationships for amphenicol antibiotics were observed within the concentration range of 0.5–250 ng mL − 1 (R 2 ≥ 0.9951). The method exhibited detection limits of 0.04–0.07 μg kg − 1 . Recovery rates ranged from 83.2% to 97.9%, with intra-day and inter-day precisions both below 7.2%. This method provides an efficient tool for monitoring amphenicol antibiotics in complex matrices.
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ENVIRONMENTAL RESEARCH
·
2026
·
IF 8.2
Yaru Li,Heming Wang,Rong Qiao,Dongxu Zhou,Fuyun Deng,Gaoyang Chen,Peixin Mao,Chaolin Yang,Xiaodong Zhang
The coexistence of antibiotics and hexavalent chromium (Cr(VI)) in aquatic environments complicates remediation due to their incompatible transformation pathways. Herein, a Co/N-doped carbon catalyst (CoNC) was prepared to activate peroxymonosulfate (PMS) for co-removal of norfloxacin (NOR) and Cr(VI), achieving 91.69% NOR degradation (k obs = 0.3135 min −1 ) within 60 min and near-complete Cr(VI) reduction (k obs = 0.5098 min −1 ) within 20 min. Mechanistic analysis revealed that NOR degradation was mainly governed by singlet oxygen ( 1 O 2 ) and electron transfer mediated non-radical pathways, while Cr(VI) reduction was facilitated through interfacial electron transfer. Electrons released during NOR oxidation enhanced Cr(VI) reduction and promoted the Co(II)/Co(III) cycle, maintaining PMS activation and 1 O 2 generation. Co–N coordination sites promoted 1 O 2 formation, and the N-doped carbon matrix mediates interfacial electron transfer. This work highlights the potential of CoNC/PMS system for efficient treatment of wastewater co-contaminated with antibiotics and Cr(VI), providing insights into coupled oxidative-reductive mechanisms.
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高影响因子
ACS Omega
·
2026
·
IF 5.2
Yulin Sun,Yiwei Zhang,Yong He,Wubin Weng,Yanqun Zhu,Peixi Liu,Zhihua Wang
Mn-based catalysts usually exhibit considerable potential for enhancing the catalytic ozonation of volatile organic compounds (VOCs) at a lower temperature. In this study, bimetallic oxides M-Mn (M = Cr, Cu, Co) were supported on HZSM-5 zeolites to degrade dimethyl carbonate (DMC, chemical formula C3H6O3), a typical VOC emitted during the productive process of lithium batteries, with Mn/ZSM-5 for comparison. The Cr-doped catalyst CrMn/ZSM-5 could achieve 92% DMC conversion with 91% CO2 selectivity (O3/DMC = 6, T = 120 °C), showing an excellent catalytic performance among the prepared catalysts. The exceptionally low-temperature activity of CrMn/ZSM-5 was attributed to the synergistic effect of its large surface area, sufficient oxygen vacancies, and suitable acidity and reducibility, which collectively enhanced the level of O3 activation and accelerated DMC degradation. Furthermore, the catalyst demonstrated desirable stability and resistance to varying concentrations of water vapor. To elucidate the reaction pathway, in situ DRIFTS was employed to track the evolution of intermediate species during the adsorption and catalytic ozonation of DMC. With a further study of DFT calculation, the reaction mechanism of DMC catalytic ozonation on CrMn/ZSM-5 catalysts was put forward.
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高影响因子
BIORESOURCE TECHNOLOGY
·
2018
·
IF 5.807
Meng Li,Shaoqi Zhou
Cu(II) ion was employed as an electron-shuttle mediator to enhance bioelectricity output and accelerate reduction rate of Cr(VI) in a dual-chamber microbial fuel cell (MFC). In the presence of Cu(II), power density and the Cr(VI) reduction rate were 1235.53 mW m −2 and 1.191 g m −3 h −1 , respectively, which were 1.44 times and 1.17 times than that of MFC in the absence of Cu(II). A series of electrochemical analysis confirmed the presence of Cu(II) can diminish overpotential and diffusional resistance of MFC, further accelerating electrochemical reduction process of Cr(VI) via an indirect mechanism. After reduction, Cr(VI) and Cu(II) in this work were mainly deposited on cathode electrodes in the form of Cr(OH) 3 and little Cu, thus wastewater containing Cr(VI) was successfully treated by bio-electrochemical technology. The aim of this work was to study the efficacy of Cu(II) as an electron-shuttle mediator for improved bioelectricity generation and Cr(VI) reduction in MFCs.
研究领域:
环境工程
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生物电化学
·
废水处理
·
能源回收
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危险品化学品经营许可证（带存储）