INTERNATIONAL JOURNAL OF BIOLOGICAL MACROMOLECULES
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2016
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IF 3.138
Li Zhang,Hanjin Luo,Peipei Liu,Wei Fang,Junjie Geng
A novel adsorbent for removal of hexavalent chromium (Cr(VI)) from aqueous solutions has been successfully prepared by modifying graphene oxide/chitosan composite with disodium ethylenediaminetetraacetate (EDTA-2Na) (GEC). This modified composite was characterized by various technologies; including scanning electron microscopy (SEM), Transmission Electron Microscopy (TEM), X-ray diffraction (XRD) and Fourier transform infrared spectroscopy (FT-IR). Batch adsorption experiments were carried out to evaluate the adsorption of Cr(VI) by GEC under different conditions. The results indicate that the adsorption of Cr(VI) on GEC was highly pH-dependent, with the highest adsorption capacity (86.17 mg/g) occurring at pH 2. The kinetics of adsorption exhibited pseudo-second-order behavior. The adsorption data were well described by the Freundlich isotherm model. The adsorption capacity increased with increasing temperature. The calculated thermodynamic parameters indicate that the adsorption is a spontaneous, endothermic and feasible process. The further regeneration experiments showed the adsorption capacity of GEC for Cr(VI) decreased 5% after 7 times reuse, indicating the potential of the as-prepared material for practical application.
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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吸附技术
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ChemPlusChem
·
2026
·Vol. 91
·期 8
·e70223
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IF 3.1
Huan V Doan,Huong T T Tran,Duyen T Le,Xuan N Pham
In this study, a novel Ni–MoO 3 @MIL‐101(Cr) composite catalyst was synthesized via a one‐step hydrothermal method for the oxidative desulfurization (ODS) of dibenzothiophene (DBT). The catalyst combines the high specific surface area of MIL‐101(Cr) with the redox properties of Ni–MoO 3 , providing an effective synergy between adsorption and catalytic oxidation. The incorporation of Ni as a promoter significantly enhances catalytic activity, enabling complete sulfur removal (∼100%) under mild conditions (50 °C) within 60 min. Structural characterizations (scanning electron microscopy, X‐ray diffraction, and SAED) reveal that the catalyst retains its nanosheet–nanorod morphology and crystalline MoO 3 phase after repeated use, with only a slight decrease in the crystallinity of the MIL‐101(Cr) framework. Mechanistic analyses using X‐ray photoelectron spectroscopy, Raman, and temperature‐programmed reduction demonstrate that surface oxygen vacancies and Lewis acid sites promote ODS activity, while highly dispersed Ni–MoO 3 species facilitate H 2 O 2 activation and Mo 6+ /Mo 5+ redox cycling, leading to efficient generation of reactive oxygen species. The catalyst also exhibits excellent stability, maintaining 98.7% DBT conversion after five cycles. These results demonstrate that the strong Ni–Mo synergistic effect and efficient oxygen activation make Ni–MoO 3 @MIL‐101(Cr) a robust and highly efficient catalyst for deep fuel desulfurization. This study presents a significant advancement in the field of oxidative desulfurization by developing a synergistic Ni–MoO 3 redox catalytic system confined within the porous MIL‐101(Cr) framework. Unlike conventional catalysts, the designed material effectively enhances H 2 O 2 activation through cooperative interactions between Ni and Mo species, enabling rapid and ultra‐deep removal of refractory sulfur compounds under mild conditions. The integration of redox‐active sites with a high‐surface‐area MOF support not only improves catalytic efficiency but also ensures excellent stability and recyclability. This work provides new insights into the rational design of bimetallic catalysts for green fuel purification and offers a promising strategy for achieving sustainable and energy‐efficient desulfurization processes.
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Nano Energy
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2026
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IF 16.7
Yan Zheng,Linjing Qiao,Zhongyang Wang,Hao Gong,Boyu Liu,Jiajun Wang,Liping Tong,Zhiyuan Zhao,Xiao Zhou,Tongxiang Fan
Chemical pressure engineering of Jahn-Teller distortion enables broadband high emissivity. • A quantitative Jahn-Teller distortion index ( Q OJT ) is established to correlate structure with emissivity. • Ca 2+ doping (Cu, Cr, Mn) 3 O 4 spinel achieves an emissivity of 0.947 across the 0.4–25 μm range. • Exceptional thermal stability is demonstrated with less than 1.4% degradation at 1673 K. • An 11% enhancement in heating rate is achieved in practical radiative heating tests. Infrared radiation materials with broadband emissivity and high thermal stability are highly desirable for energy saving and thermal management applications. However, achieving high emissivity across the visible to mid-infrared range (0.4–25.0 μm) remains challenging due to the discontinuous absorption mechanisms in ceramics. Herein, a strategy based on promoting Jahn-Teller (JT) distortion is proposed to enhance the broadband emissivity of (Cu, Cr, Mn) 3 O 4 spinel. Substituting Cu 2+ with alkaline-earth ions (Mg 2+ , Ca 2+ , Sr 2+ ) introduces tunable chemical pressure, which modifies the local electric field and valence state distribution, thereby regulating the JT structural evolution. An octahedral JT structural descriptor ( Q OJT ) is developed to quantitatively compare JT structural evolution among different compositions. The Q OJT values show a positive correlation with broadband emissivity. The optimized JT structural evolution simultaneously enhances electronic transition, carrier and lattice vibration absorption, enabling synergistic regulation of broadband emissivity across the entire 0.4–25.0 μm spectral range. Among the investigated compositions, Ca 2+ -doped (Cu, Cr, Mn) 3 O 4 exhibits a broadband emissivity of 0.947 and maintains excellent stability under a simulated hypersonic environment at 1673 K. In radiative heating test, it achieves a heating rate approximately 11% higher than that of Al 2 O 3 . These findings demonstrate that chemical pressure provides an effective strategy for regulating JT structural evolution and designing broadband thermal radiation ceramics for high temperature applications. Download: Download high-res image (225KB) Download: Download full-size image Chemical-pressure-tuned Jahn-Teller distortion in (Cu, Cr, Mn) 3 O 4 spinel enables broadband high emissivity (0.947, 0.4–25.0 μm) and exceptional thermal stability up to 1673 K. A quantitative octahedral Jahn-Teller distortion index ( Q OJT ) correlates directly with emissivity performance. The optimized material achieves a 11% acceleration in heating rate, demonstrating its potential for high-temperature radiative transfer and thermal management applications.
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APPLIED CATALYSIS A-GENERAL
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2026
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IF 4.8
Linke Zhao,Yang Li,Lili Li,Gongke Wang,Hairui Liu,Hongjing Li,Arif Nawaz,Haifa Zhai
A Z-scheme CIS/rGO/p-CN heterostructure was designed. • CIS/rGO/p-CN exhibits the highest visible-light activity for Cr(VI) photoreduction. • rGO serves as the solid-state electron mediator to switch the charge transfer mode. Hexavalent chromium (Cr (VI)), a highly toxic metal ion readily soluble in aqueous environments, poses significant threats to human health. Herein, a novel Z-scheme CuInS 2 /rGO/protonated g-C 3 N 4 heterostructure was designed with rGO serving as the solid-state electron mediator between CuInS 2 and protonated C 3 N 4 . The samples were systematically characterized using XRD, FTIR, SEM, TEM, XPS, PL, and UV–vis spectroscopy techniques. This flower-like hierarchical structure CuInS 2 /rGO/protonated g-C 3 N 4 exhibits enhanced visible-light photocatalytic activity for Cr (VI) photoreduction. Specifically, it demonstrates a 98% reductive efficiency for Cr (VI) within 20 min at pH= 4 and stable photocatalytic performance. The results indicate that the integration of rGO nanosheets significantly enhances the photocatalytic performance of the CuInS 2 /rGO/protonated g-C 3 N 4 heterostructure by weakening the built-in electric field between CuInS 2 and protonated C 3 N 4 and switching the charge transfer mode from a conventional p-n junction to a Z-scheme mechanism. Download: Download high-res image (103KB) Download: Download full-size image
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Journal of Water Process Engineering
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2026
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IF 6.6
Yixi Li,Zhuofan Sun,Xingcan Huang,Liulian Huang,Hui Wu,Lihui Chen,He Xiao
The formation of phytic acid decorated waste paper-derived hydrothermal carbon (WPC-P) were achieved. • The introduction of phytic acid enables to improve the oxygen-containing groups and specific surface area of WPC-P. • The phytic acid modified WPC-P exhibited upgraded adsorption activity of Cr(VI). • The mechanism of Cr(VI) removal was generated by electrostatic, chelation, and reduction interactions. Biomass-derived hydrothermal carbon has garnered considerable interest as a promising approach for heavy metal wastewater treatment. In this study, hydrothermal carbon derived from waste paper and coupled with phytic acid (WPC-P) was synthesized via a one-step hydrothermal process as an effective adsorbent for Cr(VI) removal. Characterization results indicated that P and O were dispersed uniformly on the surface of WPC-P. The introduction of phytic acid could greatly increase the specific surface area and number of active functional groups. The results of adsorption tests indicated that WPC-P exhibited highly efficient removal performance for Cr(VI) with maximum uptake of 174.05 mg·g −1 . The adsorption capacity of WPC-P was 10 times higher than that of WPC at 2 h. Analysis of the experimental data using adsorption kinetic and isotherm models revealed that the adsorption process of WPC-P fitted both the pseudo-second-order kinetic model and the Langmuir adsorption isotherm model well. After five consecutive adsorption-desorption cycles, the WPC-P retained about 87% of its initial capacity. The enhanced adsorption performance, ascribed to the introduction of phytic acid, could be attributed to the complexation, electrostatic interactions and reduction reactions induced by active functional groups on WPC-P. This work reported a simple method to prepare carbon adsorbents from biomass waste, which showed great potential for treating chromium-containing wastewater.
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RESEARCH ON CHEMICAL INTERMEDIATES
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2026
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IF 3.3
Xiang Yulong,Ji Xinbin,Dong Xiaoli,Wang Yu,Zheng Nan,Luo Yang,Zhao Honglin,Yan Chumin
Charge separation, transfer, and recombination are crucial factors that influence the efficiency of photocatalytic Cr(VI) reduction. The construction of Schottky junctions can remarkably facilitate the spatial separation of charge carriers. To address the issue of heavy metal pollution in industrial wastewater, an Ag-DUT-67 Schottky junction photocatalyst was synthesized by depositing silver nanoparticles (Ag NPs) onto the DUT-67 surface through a photoreduction technique. The findings indicate that Ag NPs are evenly distributed and coordinated with the sulfur atoms in the DUT-67 ligands. This modification not only elevates the oxygen vacancy content but also broadens the light response range. A Schottky barrier is established at the Ag-DUT-67 interface, which effectively reduces carrier recombination. Notably, Ag-DUT-67–2 demonstrates a remarkable Cr(VI) reduction efficiency of 98% within 30 min, with a reaction rate that is 3.4 times as much as pristine DUT-67. Additionally, Ag-DUT-67–2 shows excellent stability in high-concentration Cr(VI) solutions and in the presence of interfering ions, coupled with good recyclability. This study offers a novel framework of interface engineering and performance enhancement of MOF-based photocatalysts for heavy metal reduction.
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Molecular Catalysis
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2026
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IF 4.3
Jiarui Li,Bolun Mei,Zhouxuan Zang,Yi Yu,Guoji Liu,Li Xu
A series of Cr-UiO-66 catalysts with ligand-vacancy defects was prepared for the oxidative dehydrogenation of biomass-derived 1,2-propanediol to hydroxyacetone. • A volcano-shaped trend between defect level and hydroxyacetone yield was established. • Moderate ligand vacancies balance H 2 O 2 conversion and the selective formation of hydroxyacetone. • •OH radicals were identified as key species for H 2 O 2 -driven ODH of 1,2-propanediol. The oxidative dehydrogenation (ODH) of biomass-derived 1,2-propanediol (1,2-PDO) to the high-value chemical hydroxyacetone (HA) is a meaningful route for upgrading renewable feedstocks into value-added multifunctional chemicals. In this study, Cr-UiO-66 catalysts with tunable content of ligand vacancies were synthesized for the conversion of 1,2-PDO to HA. Notably, a volcano-shaped relationship was observed between defect density and HA yield. The optimized 0.4Cr-UiO-66 catalyst achieved an HA yield approximately 3 times that of pristine UiO-66, reaching 12.9% at 45 °C after 2 h. Moreover, the catalyst sustained its ODH performance over five reaction runs. Regulating the content of ligand vacancies was shown to modulate the acidic properties of Cr-UiO-66 and H 2 O 2 activation to generate •OH radicals. A moderate level of ligand vacancies enabled a balance between H 2 O 2 activation and selective HA formation, resulting in improved performance. This study highlights ligand-vacancy engineering as an effective strategy for regulating H 2 O 2 activation over UiO-66-based catalysts. It provides meaningful insights for tailoring structural defects in UiO-66 for the ODH valorization of biomass derivatives. Download: Download high-res image (159KB) Download: Download full-size image
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CHEMICAL ENGINEERING JOURNAL
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2026
·
IF 12.5
Zhihui Wen,Erli Ding,Yongjie Bai,Xiaochan Liu,Yourong Wei,Ge Li,Benhua Xu,Bingxin Liu
A novel ionic COF was synthesized firstly using betaine molecule as the quaternary ammonium source. • This iCOF enables facile synthesis and low cost ($88.31/kg), showing promising potential for practical applications. • Abundant binding sites and confined pores enable the material to achieve excellent Cr(VI) adsorption. • The iCOF achieves superior adsorption selectivity for Cr(VI) against competing anions ( Cl − , Br − , NO 3 − , SO 4 2 − , and CO 3 2 − ). Due to the high toxicity of Cr(VI), the development of adsorbents for effective elimination of Cr(VI) from wastewater is urgently required. Covalent organic frameworks(COFs) show great promise in heavy metal remediation. However, most COFs suffer from high costs and poor anti-interference performance, which severely restricts their practical applications. To address these limitations, natural betaine was firstly utilized as precursor to construct a novel quaternary ammonium-grafted COF structure (iCOF-BHC) via a bottom-up strategy. Grafted betaine introduces abundant quaternary ammonium sites and extra amide sites. Combined with the hydrazone groups and confined pore of the framework, these functional moieties exert multi-synergistic effects to construct precise host-guest interactions, thereby realizing superior selective adsorption toward Cr(VI). The equilibrium adsorption capacity of iCOF-BHC at 10 °C is 132.73 mg g −1 (under ambient winter conditions in Qinghai Province)，and further heating significantly improves adsorption rate and uptake capacity. iCOF-BHC exhibits outstanding selectivity for Cr(VI) in the presence of competing anions ( Cl − , Br − , NO 3 − , SO 4 2 − and CO 3 2 − ), as well as excellent recyclability, with negligible attenuation in adsorption capacity after six cycles. Furthermore, compared with the vast majority of existing COFs, it exhibits significant cost advantages and is more suitable for practical industrial applications. This work develops a facile, low-cost, and innovative strategy for the fabrication of cationic COFs, providing a viable strategy and experimental basis for the efficient adsorption of Cr(VI) from wastewater. Betaine-grafted cationic hydrazone iCOF for effective removal of Cr (VI) in wastewater. Download: Download high-res image (224KB) Download: Download full-size image
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APPLIED SURFACE SCIENCE
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2026
·
IF 6.6
Yulong Xiang,Xinbin Ji,Xiaoli Dong,Yu Wang,Nan Zheng,Jialin Niu,Pei Yu,Chumin Yan
As Cr(VI) pollution intensifies, the development of efficient, eco-friendly, and sustainable treatment technologies has become a vital focus in environmental science. Photocatalytic reduction is often seen as a promising approach for removing Cr(VI), thanks to its low energy requirements and minimal environmental impact. However, traditional photocatalytic materials face significant challenges, including narrow photoresponse range and high rate of electron-hole recombination, which impede their practical efficiency. In this study, we successfully synthesized Fe-DUT-67 photocatalysts by incorporating Fe single atoms into the zirconium-based metal–organic framework (DUT-67) through post-synthetic modification. A significant enhancement in both the visible-light absorption capacity and carrier separation efficiency of the as-prepared Fe-DUT-67 has been observed, attributed to the formation of Fe-O coordination bonds between the Fe atoms and Zr-O clusters. Fe-DUT-67-2 exhibited impressive Cr(VI) reduction activity under full-spectrum illumination, with a remarkable 90% reduction efficiency of Cr(VI) within 18 min. Density functional theory (DFT) calculations shed light on the crucial role of Fe sites in promoting photoelectron transport and facilitating Cr(VI) reduction. This work not only presents an efficient photocatalytic material for alleviating Cr(VI) pollution but also provides a theoretical foundation and design principles for the development of high-performance catalytic systems utilizing single-atom modified metal–organic frameworks.
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ChemistrySelect
·
2025
·Vol. 10
·期 24
·e00974
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IF 2
Lian Wang,Weiming Zhang,Chang Peng,Shu Chen
Graphical A multifunctional gel can achieve efficient remediation of Cr(VI)-contaminated water by reducing over 90% of Cr(VI) to Cr(III) after highly efficient adsorption of Cr(VI) through adsorption-assisted photocatalysis. This multifunctional gel holds significant application potential in wastewater treatment. The high-performance removal of highly toxic Cr(VI), along with its efficient conversion into less toxic Cr(III), will hold promise for water treatment. Herein, a novel transition metal carbide (MXene)-functionalized polyethyleneimine (PEI) gel has been designed for efficient Cr(VI) removal from water. The titanium dioxide (TiO 2 ) generated by self-oxidation of MXene acts as a photocatalytic species, while MXene serves as a medium for charge separation and transfer. The PEI networks provide numerous adsorption-active sites (i.e., amine groups), stabilize the photocatalytic species (i.e., TiO 2 ), and medium (i.e., MXene), thereby endowing the composite gel with both adsorption and photocatalysis ability. Its adsorption behavior conforms to pseudo-second-order kinetics and the Langmuir adsorption model, with a maximum adsorption capacity of up to ∼431 mg·g −1 . Importantly, this composite gel can convert about 90% of highly toxic Cr(VI) into less toxic Cr(III) through adsorption-assisted photocatalysis way. This work presents foundational findings for developing multi-functional gels aimed at wastewater treatment.
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PROCESS SAFETY AND ENVIRONMENTAL PROTECTION
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2025
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IF 7.8
Bohan Zhang,Chang Wen,Mingtao Xu,Zhaoxi Ye,Wenshang Chen,Ben Chen,Qingsong Hua,Ke Liu,Zhengkai Tu
Proton exchange membrane water electrolysis (PEMWE) is a promising technology for sustainable hydrogen production, nevertheless it faces challenges related to the high cost and scarcity of noble metal-based anodic catalysts. Herein, we report a low-cost, high-performance acidic oxygen evolution electrocatalyst, Cr 0.66 Ru 0.34 O 2 /TiO 2 , consisting of chromium-ruthenium mixed oxides supported on a TiO 2 substrate. The catalyst was synthesized through sol-gel and hydrothermal methods, enabling controlled crystallinity and uniform dispersion. By tuning the Cr/Ru ratio, we elucidated the synergistic interaction between Cr and Ru, which modulates the electronic structure and morphological characteristics of the catalyst, thereby promoting the lattice oxygen mechanism (LOM) and enhancing catalytic activity. TiO 2 was employed as a support due to its high specific surface area and excellent chemical stability under acidic conditions, which helps stabilize oxygen vacancies and facilitates the oxygen vacancy site mechanism (OVSM), ultimately improving the catalytic stability. The optimized Cr 0.66 Ru 0.34 O 2 /TiO 2 catalyst delivers a low overpotential of 179 mV at 10 mA cm −2 in 0.5 M H 2 SO 4 and demonstrates excellent stability under constant current operation. When applied in a PEM single-cell electrolyzer, the catalyst achieves a low cell voltage of 1.633 V at 1 A cm −2 and stable operation over 180 h at 60 °C, outperforming commercial IrO 2 . These results highlight the potential of Cr-doped Ru-based oxides supported on TiO 2 as efficient and durable anode catalysts for next-generation PEM water electrolyzers with reduced noble metal usage.
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JOURNAL OF HAZARDOUS MATERIALS
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2025
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IF 11.3
Jiajun Guo,Wen Dai,Xiaoyan Feng,Yuankun Zhou,Hengyi Xu
Nanoplastics (NPs) and chromium (Cr) are prevalent in environments, significantly polluting agricultural settings and food, thereby posing humans inevitably exposed to these toxic substances. As a biodegradable plastic, polylactic acid (PLA) is different from other petroleum-based nanoplastics and its toxicity remains unknown. This study investigated the toxicity of PLA NPs and Cr(VI), exploring the mechanisms underlying their synergistic cardiotoxicity. We indicated that co-exposure of mice to PLA NPs and Cr(VI) in drinking water for 30 days exhibited an intracellular redox imbalance, excessive production of mitochondrial reactive oxygen species (mtROS), iron overload, and the onset of ferritinophagy. By inhibiting ferroptosis and facilitating the clearance of mtROS, we observed a significant alleviation of cardiac injury. In summary, our study investigated the synergistic cardiotoxicity of PLA NPs and Cr(VI), aiming to provide new insights and references for the risk assessment of NPs and heavy metals.
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