JOURNAL OF ENVIRONMENTAL MANAGEMENT
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2025
·
IF 8.4
Yuliang Tu,Jianle Wang,Yanfeng Huang,Hong Deng,Xueming Liu,Jiaxin Lv
Hexavalent chromium [Cr(VI)] presents substantial environmental and health hazards due to its pronounced toxicity and mobility in soils. Traditional chemical reduction methods for Cr(VI) are often inadequate for treating chromium-contaminated soils, as they may fail to fully reduce Cr(VI), leading to incomplete remediation. Consequently, there is a critical need to develop more efficient and environmentally sustainable methods for the treatment of hexavalent chromium. This study explores an innovative approach using microwave-enhanced reduction of soil iron minerals facilitated by tea polyphenols to achieve transformational fixation of Cr(VI). The microwave-assisted treatment (0.5 wt% TP combined with MW at 700 W for 10 min) significantly reduced Cr(VI) concentrations in iron-rich soil from 363.4 mg kg −1 to 0.3 mg kg −1 , achieving a removal rate of 99.9%, compared to TP treatment alone (0.5 wt%). Transmission electron microscopy (TEM), scanning electron microscopy with energy-dispersive X-ray spectroscopy (SEM-EDS), X-ray diffraction (XRD), Fourier-transform infrared spectroscopy (FTIR), and X-ray photoelectron spectroscopy (XPS) analyses revealed that the enhanced removal efficiency of Cr(VI) by microwave-assisted tea polyphenols is attributable to the accelerated reduction of soil iron minerals by the polyphenols. Furthermore, microwave enhancement facilitated the transformation of Cr into more stable forms, such as Cr 2 O 3 and FeCr 2 O 4 . Additionally, the Cr(VI) content in the treated soil remained below 3 mg kg −1 after 360 days of atmospheric exposure, indicating sustained immobilization. This study demonstrates that the integration of tea polyphenols with microwave irradiation constitutes a promising strategy for the remediation of Cr(VI)-contaminated soils.
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高影响因子
WATER AIR AND SOIL POLLUTION
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2025
·Vol. 237
·期 6
·331
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IF 3
Chen Xinyu,Shen Xudong,Hua Yu,Lian Jianjun,Kong Qiaoping,Ye Tianran,Chen Bo,Wang Xinyang
The lignocellulosic biorefinery sector holds significant potential to play a pivotal role in advancing global carbon neutrality goals. However, the efficient utilization of waste lignin remains a critical bottleneck, severely impeding the sustainable development of this industry. This study used a two-step method to prepare zinc and nitrogen activated lignin (Zn/N-lignin), and investigated its removal performance, influencing factors, and potential mechanisms for hexavalent chromium Cr(VI) in water. Results indicated that Cr(VI) removal process conformed to the Langmuir adsorption isotherm model and pseudo-second-order kinetic model. At an initial Cr(VI) concentration of 10 mg·L −1 and an adsorbent dosage of 400 mg·L −1 , the maximum adsorption capacity at 298 K was 284.61 mg·g −1 . Low concentrations (less than 0.1 mmol·L −1 ) of cations Ca 2+ and Mg 2+ , as well as competitive anions H 2 PO 4 − and NO 3 − , have little effect on the removal of Cr(VI). Zn/N-Lignin possessed a good regeneration performance, and the removal efficiency still reached more than 80% after five adsorption and desorption times. Spectral analysis and density functional theory calculations indicated that the main mechanisms of Zn/N-Lignin for removing Cr(VI) from water were electrostatic adsorption, hydrogen bonding and chemical reduction. In order to investigate the environmental impact of the preparation process of Zn/N-Lignin, a life cycle assessment (LCA) was conducted and the contribution of each component to the production of Zn/N-Lignin was analyzed. These results show that Zn/N-Lignin is not only an effective pathway for lignin resource utilization, but also an economically efficient adsorbent for Cr(VI) removal. Graphical
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WATER RESEARCH
·
2025
·
IF 12.4
Huajing Zhou,Kun Wang,Liang He,Zilian Liu,Dianchao Kong,Qiang Zhang,Song Jin,Ying Han,Qingqing Guan,Guoping Sheng
Groundwater remediation presents significant challenges, while microbial electrocatalytic remediation is promising but suffers from low efficiency due to low periplasmic electron transfer. Unlike traditional methods, which involve directly improving the conditions for electron transfer, herein, we first developed an electron-enhanced proton motive force (PMF) strategy for effective Cr(VI) removal. The proton is used as a new mutagenic source to mutate microorganisms by coupling with a micro-electric field. Interestingly, the dominant bacterial species of Rhizobium can directly capture protons (H + ) and electrons from the cathode as energy sources, resulting in greater than 97% reduction and immobilization of Cr(VI) in groundwater. Since the increase in the proton concentration gradient across the cytoplasmic membrane is due to the free diffusion of protons through new proton transfer channels, the extracellular electron transfer (EET) process is accelerated significantly, and Cr(VI) can also shuttle inside the cell to be reduced. 13 C isotope tracer technology and genetic volcano maps were used to further monitor the active transmembrane ETC transport pathway. The accumulated H + transfers electrons through reduced coenzymes, such as glycoside hydrolases (GH3, GH13-40, and GH5-15) and beta-galactosidase (CBM43), establishing a new transmembrane transfer pathway in the periplasmic space. In addition, unlike conventional bioremediation techniques, the proton gradient intensifies the motive force (PMF-H + ) to accelerate the synthesis of adenosine triphosphate, which provides energy for the bioremediation of Cr(VI), leading to a high bioelectrocatalytic rate. The new PMF-H + strategy successfully restored Cr(VI)-contaminated groundwater in situ to meet the water quality standard, indicating great potential for groundwater remediation.
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高影响因子
JOURNAL OF MATERIALS SCIENCE & TECHNOLOGY
·
2025
·
IF 14.3
Hongxiang Chen,Zhilong Zhang,Xiaochun Wen,Ze Zhang,Fa Chang,Jianeng Huang,Yunfeng Su,Hengzhong Fan,Bing Xiao,Yongsheng Zhang
The discovery of out-of-plane ordered (o-MAX) phases has been largely confined to Al-containing systems, leaving a critical gap in understanding chemical ordering mechanisms across other A-element families. Meanwhile, the 413-type Ge-based MAX phases in bulk form are still lacking. Here, we report the first synthesis of bulk Ge-based 413-type MAX phases: Cr 2 Ti 2 GeC 3 , (Cr 1/3 Ti 1/3 Mo 1/3 ) 4 GeC 3 , and (CrTiVMo)GeC 3 , thereby expanding both structural complexity and chemical ordering paradigms in nanolaminate ceramics, and introducing the second series of o-MAX phases. Through combined Rietveld refinement and atomic-resolution elemental mapping, we demonstrate robust Ti-Cr out-of-plane chemical ordering in these phases, with Ti preferentially occupying the inner metal layers adjacent to Ge atoms and Cr populating the outer layers. This chemical ordering pattern is preserved even in quaternary metal compositions. In contrast, the introduced Mo and V are distributed almost randomly at both sites. First-principles calculations demonstrated the thermodynamic stability and electronic structure, and quantified the mechanical properties of Ge-based 413 phases, revealing enhanced mechanical moduli and tunable ductility through V/Mo incorporation. This work expands the o-MAX family beyond Al-based systems, establishing Ge-containing high- n phases as a platform for designing chemically ordered nanolaminates with tailored stiffness-ductility balance.
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ENVIRONMENTAL RESEARCH
·
2025
·
IF 7.7
Xiao-Qian Jin,Jia-Lei Li,Jun-Bin Xiong,Rui Zhang,Chen-Yuan Li,Xue-Ting Wang,Wei-Hong Guo,Da-Chuan Yin
In this work, cross-linked hemoglobin crystals (CLHCs) were synthesized using discarded cow blood as raw material, and palladium nano particles (Pd NPs) was synthesized in situ within its lattice to obtain CLHCs@Pd catalytic used for catalyzing the reduction of Cr(VI). In addition, we investigated the influence of synthesis process on the morphology, loading capacity, and size of Pd NPs, and the results showed that the minimum size of Pd NPs was distributed around 2 nm under any process conditions. The X-ray single crystal diffraction results indicate that the lattice of protein crystals may have a controlling effect on the size of Pd NPs. Subsequently, the mechanism of synthesizing Pd NPs by CLHCs was studied using techniques such as SEM, TEM, FTIR and XPS. Finally, the catalytic activity and cycling performance of Cr(VI) removal by CLHCs@Pd were evaluated. The results indicate that the CLHCs@Pd not only exhibit high catalytic activity for Cr(VI) removal, but also maintain consistent catalytic performance over 20 consecutive catalytic cycles. Overall, this work provides CLHCs@Pd catalysts have the following advantages: (1) small size and uniform dispersion of Pd NPs; (2) High cycling performance and high catalytic activity; (3) Low cost and environmentally friendly preparation process.
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高影响因子
CHEMOSPHERE
·
2018
·
IF 4.427
Wei Fang,Xianying Jiang,Hanjin Luo,Junjie Geng
A novel hybrid nanocomposite, polypyrrole nanoparticles (PPy) anchored on the graphene/silica nanosheets with the high specific surface area (polypyrrole-graphene/silica, GS-PPy), was synthesized by a facile in situ polymerization and shows great potential to remove hexavalent chromium [Cr(VI)] in aqueous solutions. Characterizations by XRD , TEM, SEM, BET, FT-IR and XPS, have confirmed that the PPy nanoparticles were well-distributed on the surface of GS nanosheets . The effects of pH, contact time, the concentration of Cr(VI), temperature, coexisting ions and the number of adsorption-desorption cycles were studied. The maximum adsorption capacity of the GS-PPy for Cr(VI) was 429.2 mg g −1 at 298 K at pH 2, which was much higher than PPy nanoparticles and other related materials. The adsorption data fitted to the pseudo-second-order model and Langmuir isotherm model. The removal mechanism involved in electrostatic attraction, ion exchange and reduction process that partial adsorbed Cr(VI) was reduced to Cr(III). And Cr(III) was still retained on the surface of GS-PPy. The GS-PPy nanocomposite will be a potential candidate for the removal of Cr(VI) from the industrial waste water.
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ENVIRONMENTAL TECHNOLOGY
·
2020
·
IF 2.213
Liang Xu,Fenglian Fu,Peijing Yu,Guangzhao Sun
To efficiently treat hexavalent chromium (Cr(VI)) wastewater, K2FeO4 was used to remove and reduce Cr(VI) in presence of Mn(II) in this paper. Batch removal experiments were carried out to study the effect of Fe/Mn molar ratios, initial pH, in-situ and ex-situ and co-existing ions on Cr(VI) removal. The results showed the removal efficiency of Cr(VI) was 97.7% for the initial Cr(VI) concentration of 10.0 mg/L at Fe/Mn molar ratio of 2:3 and initial pH 8.0. Meanwhile, the high removal efficiency of Cr(VI) had been maintained throughout the pH range of 3.0–8.0 in the experimental study. Moreover, the removal process was relatively stable regardless of in-situ and ex-situ, and co-existing ions such as Ca2+ and low concentration of HCO3− had no intense effect on Cr(VI) removal, while SO42− inhibited Cr(VI) removal in the reaction system. To investigate the removal mechanism of Cr(VI) by K2FeO4 in presence of Mn(II), the reaction products were characterized by the Fourier transformed infrared spectrometer, X-ray powder diffraction, Transmission electron microscopy and the high-resolution X-ray photoelectron spectroscopy. The results indicated the ferrate decomposition products of γ-FeOOH/γ-Fe2O3 had the ability to adsorb Cr(VI) and react with Mn(II) to form γ-Fe2O3-Mn(II) complex to adsorb and reduce Cr(VI).
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CHEMICAL ENGINEERING COMMUNICATIONS
·
2025
·
IF 2
Fan Pan,Lijiang Tian,Fulong Chen,Jie Zhang
The photocatalytic efficiency of titanium dioxide(TiO2) is easy to restrict by rapid recombination of carriers, narrow spectrum response range, and low specific surface area. Constructing heterojunctions has been widely acknowledged as a viable strategy to enhance the photocatalytic performance of TiO2. Here, TiO2@MIL-101(Cr) heterojunction was synthesized via the in-situ method and applied to adsorbing and photocatalytic degrading of gaseous benzene. The findings demonstrate 40TM exhibited the best adsorption(1157.03 μgC6H6/(g·h)) and photocatalytic(817.80 μgC6H6/(g·h)) performance, which were 2.05 and 5.21 times of TiO2, respectively. The enhancement of adsorption performance probably resulted from the higher specific surface area(637.33 m2/g) and the micro-mesoporous structure. The excellent photocatalytic performance might stem from the extended wavelength response range(400–700 nm) and the Z-scheme heterojunction formation. The possible mechanism is that electrons in MIL-101(Cr) and holes in TiO2 could participate in redox reactions to generate radicals, with superoxide radicals(∙O2−) and hydroxyl radicals(∙OH) being identified as the primary active species for benzene degradation. Overall, this investigation offers a valuable reference for the application of heterojunction catalysts in the field of adsorption-photocatalytic degradation of volatile organic compounds (VOCs).
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高影响因子
MICROPOROUS AND MESOPOROUS MATERIALS
·
2026
·
IF 4.5
Yan Jin,Hui Zhang,Tengfei Li,Shaojie Lei,Meier Jiaerheng,Dezhang Ren,Zhibao Huo
Biodiesel has emerged as a promising alternative to conventional diesel due to its renewability and environmental friendliness. In this study, a MIL-101(Cr) featuring synergistic acid sites was developed through a combined defect engineering and post-sulfonation strategy, enabling efficient esterification of oleic acid under mild conditions. Defects were introduced in the MIL-101(Cr) through a mixed-ligand approach. The existence of abundant oxygen vacancies in the defect-engineered MIL-101(Cr) was confirmed by electron paramagnetic resonance (EPR), which could provide adequate grafting sites for the subsequent sulfonation. The sulfonic acid-functionalized MIL-101(Cr) catalyst (MRBSX) was then synthesized by post-sulfonation with chlorosulfonic acid as the sulfonation agent. The chemical structure and sulfonic acid density of MRBSX were systematically investigated by X-ray diffraction (XRD), scanning electron microscope (SEM), brunauer-emmett-teller (BET), and Fourier-transform infrared spectra (FT-IR), and other characterization techniques. Acid-base titration combined with elemental analysis (EA) demonstrated the successful loading of sulfonic acid groups in MRBSX, highlighting the promotional role of oxygen vacancies in enhancing acid site density and catalytic efficiency. Under optimized reaction conditions (100 °C, 6 wt%, 3 h, and M/O = 8:1), the MRBSX with 10 mol% benzoic acid achieved a high oleic acid conversion of 96.7 % and a corresponding biodiesel yield of 91.5 %. Therefore, the proposed synergistic strategy of defect engineering and post-sulfonation is effective in constructing high-performance solid acid catalysts, demonstrating promising potential in green energy conversion applications.
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高影响因子
Journal of Materials Chemistry A
·
2026
·
IF 9.5
liang wu,Na Wang,Yifeng Xiao,Qiankun Zhang,Guangyao Yang,Zhi He,Xiyue Kang,Yao Jiang,Yuehui He
Direct seawater electrolysis represents a pivotal technology for green hydrogen production. However, achieving efficient and stable cathodic heterostructures capable of maintaining long-term stability under industrial current densities remains a significant challenge. This work reports an in situ constructed Ni-Cr-Fe-Mo heterostructure derived from four transition metal powders, which feature multilevel catalytic heterointerfaces and abundant multifunctional active sites. The heterostructure demonstrates sustained hydrogen evolution for 50 hours at 2 A cm -2 in alkaline and neutral seawater electrolytes, while exhibiting exceptional performance under amperelevel current densities. Density functional theory (DFT) calculations reveal that two distinct active sites at the multiscale Ni-Cr-Fe-Mo heterointerfaces synergistically accelerate the hydrogen evolution reaction (HER) through a relay catalysis mechanism: one site facilitates H 2 O cleavage and the other promotes H 2 synthesis. This cooperative process not only optimizes reaction kinetics but also enhances corrosion resistance, enabling persistent high-efficiency seawater electrolysis. The study provides fundamental insights into the mechanisms driving long-term operational stability and offers a novel paradigm for developing durable heterostructures for industrial-scale seawater hydrogen production.
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Desalination and Water Treatment
·
2024
·
IF 1
Xuezhen Feng,Yakun Zhang,Chunyan Liang,Jingang Yu,Xinyu Jiang
A novel adsorbent, poly-(dimethyl diallyl ammonium chloride) (PDDA) functionalized graphene oxide (GO) further decorated with ferro ferric oxide (Fe 3 O 4 ) nanoparticles, has been developed and used for instantaneous Cr(VI) removal from aqueous solution, and a reliable direct filtration-adsorption was achieved. Fourier transform infrared (FTIR) spectroscopy, Raman spectra (Raman), zeta potential measurement, scanning electron microscopy (SEM), high-resolution transmission electron microscopy (HRTEM), X-ray photoelectron spectroscopy (XPS) and differential pulse voltammetry (DPV) were adopted to confirm and investigate the chemical compositions, surface properties, morphological and electrochemical performance of the as-prepared magnetic nanocomposite (denoted as GO/PDDA/Fe 3 O 4 ). The maximum adsorption capacity of GO/PDDA/Fe 3 O 4 for Cr(VI) was 141.68 mg/g at pH = 2, and the desorption-regeneration results exhibited GO/PDDA/Fe 3 O 4 could be a potential prospective nanocomposite used for instaneous filtration-adsorption of Cr(VI) from aqueous solution in real-life situations due to its fast, effective and stable properties.
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JOURNAL OF SUPERCRITICAL FLUIDS
·
2024
·
IF 3.4
Jianqiao Yang,Yining Ding,Fen Zhao,Shuzhong Wang,Yanhui Li,Donghai Xu
In this study, a Cr coating was fabricated on Ni-based alloys to prevent under-deposit corrosion. The effect of salt deposition on the structural integrity of the Cr coating in SCW environment with/without oxygen was investigated. Results show that the Cr coating kept its integrity after exposure in SCW environment, successfully avoided the metallic ions leaching from Ni-based alloys. The structure of the oxide layer after exposure is a thin Fe 2 O 3 or FeCr 2 O 4 layer and a Cr 2 O 3 layer. The oxidation rate of the Cr coating decreased to one third of the sample after exposure in the same environment without salt deposit layer, indicating that the inward mass-transfer of oxygen to the alloy surface was inhibited by the salt deposit layer. The volume expansion of the sample due to the growth of Cr oxide layer was restrained by the salt deposit layer, forming a growth stress in the coating.
研究领域:
材料科学
·
腐蚀科学
·
高温材料学
·
表面工程
·
能源材料
·
化学工程
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