Materials
·
2025
·Vol. 18
·期 13
·2930
·
IF 3.2
Xinyu Yang,Yan Mu,Lina Zhang,Dan Sun,Tiantian Jian,Weiliang Tian
In order to develop an efficient, environmentally friendly heavy metal ions adsorbent, the amino-modified expanded vermiculite-supported nano zero-valent iron (nZVI@PEI/EVMT) was prepared by using polyethyleneimine (PEI) as the functional reagent and expanded vermiculite (EVMT) as the carrier. The characterization results of nZVI@PEI/EVMT confirm that the PEI modification did not destroy the crystal configuration of EVMT, and when nano zero-valent iron (nZVI) was successfully loaded onto the PEI/EVMT surface, the value of saturation magnetic field was 41.5 emu/g, which could be separated from solution with magnet. The performance of Cr(VI) adsorption onto nZVI@PEI/EVMT was studied, showing that the ideal mass ratio for nZVI@PEI/EVMT was 1:1, and the removal capacity was largest when solution pH was 2. After four adsorption–desorption cycles, the adsorption amounts remained 40.1 mg/g. The Cr(VI) adsorption onto nZVI@PEI/EVMT was more consistent with a pseudo-second-order kinetics equation. Isotherm adsorption data accord with the Langmuir model, which suggests that the adsorption was the monolayer, the maximum adsorption amount was 116.2 mg/g at 30 °C and pH 2, and the adsorption was spontaneous and endothermic. It was inferred that the adsorption mechanisms included electrostatic attraction, reduction, chemical complexation, and co-precipitation.
✓ 已验证
产品关联
DOI
PubMed
高影响因子
WATER RESEARCH
·
2025
·
IF 12.4
Jiaqi Bai,Lie Liu,Xiaoqiang An,Qingwen Tang,Huachun Lan,Huijuan Liu,Jiuhui Qu
Ionic contaminants, especially heavy metal ions, are a significant challenge for ensuring the safety and quality of drinking water. Electrosorption and membrane separation are effective technologies to remove ionic contaminants; however, the constant electricity demand and lack of selectivity limit their further application. In this study, a low-pressure membrane with an electrically tuning surface charge was developed for the selective and efficient removal of hexavalent chromium (Cr(VI)) from water. Poly(vinyl ferrocene) (PVF) was used to fabricate an electrically responsive interface, and an activated carbon felt (ACF) was applied as a conductive substrate. Fluorescence characterization was then used to further highlight its redox properties and the tunability of its surface charge. The activated PVF-based electro-responsive adsorptive membrane (PERAM) showed an excellent adsorption capacity and selectivity for Cr(VI) during single-pass filtration. Notably, regeneration was achieved by the application of a reversed electric potential without the need for additional chemical additives. The Cr(VI) effluent concentration was reduced to <0.05 mg/L at a high flux of 424 L/m 2 ·h, and it had a treatment capacity of greater than 5140 L/m 2 due to effective activation and regeneration. The electrostatic force changes between the PVF and Cr(VI) at different potentials was the key mechanism that allowed for the rapidly reversible adsorption-desorption of Cr(VI) according to the results of the density functional theory (DFT) calculations and molecular dynamics (MD) simulations.
✓ 已验证
产品关联
DOI
PubMed
高影响因子
Journal of Environmental Chemical Engineering
·
2025
·
IF 7.2
Zhenhua Xin,Renjie Chen,Chuanjin Lin,Bin Dong,Zuxin Xu
The aggregation and separation of magnetic biochar (MBC) are the bottlenecks in its application for the removal of hexavalent chromium (Cr(VI)) from aquatic media. To solve this problem, MBC and Fe(II)–sodium alginate (SA) hydrogel were combined to form SA–Fe(II)–MBC beads (SA–Fe–C), which were used for Cr(VI) removal and immobilization from aqueous solutions. SEM and XPS revealed that the 3D network structure of SA–Fe(II) hydrogel effectively prevented the aggregation of MBC. The experimental maximum Cr(VI) removal capacity of SA–Fe–C beads was 30.03 mg/g at pH 4. The spontaneous process of Cr(VI) removal by SA–Fe–C beads was best described by a pseudo-second-order model and dominated by chemical adsorption. Toxicity characteristic leaching procedure extraction showed that SA–Fe–C beads exhibited excellent immobilization capacity for Cr. The mechanism whereby SA–Fe–C beads removed and immobilized Cr(VI) from solution was found to involve: (1) adsorption, (2) reduction of Cr(VI) to trivalent chromium (Cr(III)) by Fe(II) and hydroxyl groups, and (3) co-precipitation of Cr(III) with Fe(II) to form chromite. In addition, the beads demonstrated excellent regeneration capability and reusability, showing promising potential for heavy metal removal from contaminated water.
✓ 已验证
产品关联
DOI
高影响因子
Water
·
2025
·Vol. 17
·期 19
·2910
·
IF 3
Xinchi Zong,Tianliang Duan,Linyan Chen,Zhengwei Luo,Hui Jiang,Wenhua Geng
The escalating issue of water pollution driven by rapid industrialization necessitates the development of advanced remediation technologies. In this study, a novel method for producing chromium (Cr(VI)) ion-imprinted biochar (Cr(VI)-IIP-PEI@NBC) from wheat residue was proposed. After acid-oxidative modifications, polyethyleneimine (PEI) and glutaraldehyde (GA) were employed as the functional monomer and crosslinker, respectively, to enhance the biochar’s selectivity and adsorption capacity. Under optimized conditions (pH 2.0, 55 °C), the adsorbent achieved a maximum Cr(VI) uptake of 212.63 mg/g, which was 2.3 times higher than that of the non-imprinted biochar. The material exhibited exceptional specificity (99.64%) for Cr(VI) and maintained >80% adsorption efficiency after five regeneration cycles, demonstrating excellent reusability. Comprehensive structural characterization via Fourier transform infrared spectroscopy (FT-IR), thermal gravimetric analysis (TGA), Brunner–Emmet–Teller measurements (BET), and Scanning Electron Microscopy (SEM) confirmed successful Cr(VI) imprinting in the biochar and its high thermal stability and mesoporous architecture, elucidating the mechanisms behind its superior performance. This study presents a sustainable and high-performance adsorbent for the efficient treatment of chromium-contaminated wastewater, with significant potential for industrial applications.
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF ALLOYS AND COMPOUNDS
·
2025
·
IF 6.3
Tuowen Chen,Jingyi Tuo,Yihao Wu,Hui Wang,Yongduo Sun,Xuefei Huang
Fe-Cr alloys were fabricated using powder metallurgy (PM) with varying additions of ZrC (0–1.5 wt%) to investigate the influence on microstructure and mechanical properties. The resulting alloys exhibited a bimodal grain structure with dispersed nano-oxides (TaO, ZrO 2 ) and carbides (ZrC). The alloy containing 1.5 wt% ZrC demonstrated the most favourable combination of properties, achieving a yield strength of 1373 MPa and an elongation of 11.9 % at room temperature, which is attributed to synergistic dispersion strengthening. At 700°C, this alloy retained a yield strength of 470 MPa, surpassing that of many oxide dispersion-strengthened alloys. Incorporating ZrC refined the microstructure, promoted phase transformations, and inhibited the formation of coarse oxides, enhancing strength and ductility.
✓ 已验证
DOI
高影响因子
Reaction Kinetics Mechanisms and Catalysis
·
2026
·
IF 2.1
Hu Yanan,Yang Dawei,Li Qiaoling,Yu Chengcheng
Herein, a Cr-doped Ni-Cu/(NiOH) 2 coating supported on nickel foam (Ni-Cu-Cr/NF) was fabricated via a facile one-step electrodeposition strategy and employed as an efficient electrocatalyst for the hydrogen evolution reaction (HER) in alkaline media. In 1 M NaOH, Ni–Cu–Cr/NF requires an overpotential of 30 mV to reach a current density of − 10 mA cm⁻ 2 and exhibits a Tafel slope of 55 mV dec⁻ 1 . These electrochemical results are associated with the combined effects of the multicomponent composition and an increased electrochemically active surface area (ECSA). The ECSA of Ni–Cu–Cr/NF is approximately 23.6 times that of Ni–Cu/NF. In addition, the catalyst maintains stable operation for 60 h during continuous electrolysis. This work presents a simple preparation method for the novel Ni-Cu-Cr/NF catalyst and systematically investigates the impact of Cr doping on enhancing catalytic performance, providing an effective strategy for the development of nickel-based alloy electrocatalysts. Graphical
✓ 已验证
产品关联
DOI
高影响因子
Energies
·
2026
·Vol. 19
·期 11
·2528
·
IF 3.9
Lang Tang,Zhongwei Yue,Zihao Chen,Chu Chen,Haichao Yao,Bo Wang,Huihong Tang,Yi-Bing Cheng,Meiting Guo,San Ping Jiang
Chromium-forming metallic interconnectors (ICs) are generally used to assemble protonic ceramic fuel cell stacks (PCFCs). Thus, Cr poisoning is a potential threat to the performance and stability of PCFCs. The effects of Cr deposit and poisoning on the performance and stability of a typical BaCo0.8(Zr0.8Y0.2)0.2O3-δ(BCZY) air electrode after polarization with a current density of 0.2 A cm−2for 50 h are investigated. It is found that the BCZY and Cr2O3powder are able to react even at 400 °C. In addition, Cr poisoning affects the chemical stability of BCZY. The humidification of air accelerates the Cr deposition and poisoning of BCZY by promoting the surface segregation of Ba and Cr evaporation from IC, and the main phase of the surface deposit is BaCrO4. When the air humidity increases from 3% to 50%, the deposit layer depth increases from 0.949 μm to 2.870 μm. For the fuel cell exposed to air with a relative humidity of 3% and 50%, the polarization resistance (Rp) increases by 19.9% and 53.3%, while the ohmic resistance (RΩ) increases by 3.5% and 17.1%, respectively. This study lays the foundation for further design of Cr-tolerant air electrodes and the selection of working conditions.
✓ 已验证
DOI
高影响因子
COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS
·
2026
·
IF 5.4
Yihan Li,Xuezhu Zhang,Xiaoxiao Wang,Fushuo Shen,Yan Zhang,Changxin Du,Peng Shun,Likai Wang,Xiaobin Wang,Qiang Liu,Qinze Liu
Hexavalent chromium (Cr(VI)) is a highly toxic pollutant with substantial risks to ecosystems, rendering its efficient removal from waters a critical challenge. This study fabricated a novel poly(pyrogallol-tetraethylenepentamine)/carbonizing corncob (PPTA/CC) composite for Cr(VI) decontamination by decorating mussel-inspired resin onto carbonized corncob (CC) via a facile modification strategy. The PPTA/CC hybrid synergistically integrated the hierarchical porosity of the CC support with the abundant phenolic hydroxyl and amino functional groups of PPTA polymer layer, thereby facilitating rapid adsorption-reduction of Cr(VI). The theoretical maximum adsorption capacity was determined to be 787 mg g −1 , with the process being spontaneous (as indicated by negative ΔG°) and endothermic, well-described by the Langmuir isotherm and pseudo-second-order kinetic models. PPTA/CC candidate also exhibited outstanding selectivity and stability toward Cr(VI) in the presence of common coexisting ions. These results highlight PPTA/CC as a promising composite material for the efficient remediation of Cr(VI) in wastewater treatment applications.
✓ 已验证
产品关联
DOI
高影响因子
PLASMA SCIENCE & TECHNOLOGY
·
2022
·Vol. 24
·期 12
·124017
·
IF 1.842
Xinluo TIAN,Heping LI,Liyu ZHENG,Fangjian LI,Zhongyang ZHENG,Shengming YIN,Xinyun WANG,Youwei YAN
In this study, a Cr2O3 nanosheet (Cr2O3 NS) inserted Cr-Zr-O coating was developed as a hydrogen isotope permeation barrier. The Cr2O3 NSs, fabricated by rapid heat treatment, were amorphous with a thickness of only several nanometers. These Cr2O3 NSs were then incorporated into a Cr-Zr-O multi-metal oxide composite coating via a dip-coating method to form a coating. The effect of the Cr2O3 NS concentration on the morphology, microstructure and deuterium permeation resistance of the coating was studied. With the addition of 1.0 g l−1 Cr2O3 NSs, compared with the Cr-Zr-O coating without NSs, the permeation reduction factor of the resultant coating was enhanced from 249 °C to 575 °C at 500 °C. The coating, with a thickness of nearly 193 nm, achieved a comparable deuterium resistance that was above two orders of magnitude higher than the steel substrate. The results show that ceramic NSs can serve as effective fillers for enhancing the coating performance when functioning as a hydrogen isotope barrier.
✓ 已验证
DOI
高影响因子
Desalination and Water Treatment
·
2024
·
IF 1
Yuming Peng,Bin Sun,Zhengyuan Feng,Nan Chen,Jianguo Wang,Minghui Lv
An effective aluminum-dolomite composite, developed with a mixture of dolomite, bentonite, sawdust, and AlCl 3 , has been used for Cr(VI) removal from aqueous solution. Optimal mixture design method was used to determine the optimum mixture proportions by evaluating both chromium removal efficiency and mechanical strength. It was found that the optimum adsorption capacity and strength can be achieved with the proportion of 4.90 g dolomite, 3.12 g bentonite, 1.48 g sawdust, and 0.50 g AlCl 3 (10 g in total). Batch experiments were carried out using the composite revealed that 92% removal efficiency for Cr(VI) was occurred at pH 6 and room temperature (20°C). The adsorption kinetic and isotherm data well agreed with the pseudo-first-order kinetic and the Freundlich isotherm models, respectively. The co-existing anions (chloride, nitrate, and acetate) had slight negligible influence, and sulfate could significantly decrease the Cr(VI) adsorption efficiency. The aluminum- dolomite composite is a cost-effective adsorbent for Cr(VI) removal from aqueous solution, especially from low-level (<50 mg/L) sulfate solution, and no secondary pollution was observed after adsorption process.
研究领域:
环境科学
·
材料工程
·
水处理
·
吸附技术
✓ 已验证
DOI
高影响因子
JOURNAL OF POROUS MATERIALS
·
2022
·Vol. 30
·期 1
·311-325
·
IF 2.523
Li Zhengjie,Zhang Lu,Li Yunlong,Zhou Lilong,Han Jilong,Xu Hong,Yun Jimmy,Shen Shufeng,Liu Runjing
In the present work, functionalized MIL-101(Cr)-X (X = –Br, –CH 3 , –HSO 3 , –NO 2 ) materials with mesoporous pores were synthesized and used for tannic acid (TA) adsorption from aqueous solutions. In comparison with MIL-101(Cr), NO 2 -substituted MIL-101(Cr) was found to have positive surface charge and only slight reduction in its specific surface area, resulting in higher TA adsorption capacity than the parent MIL-101(Cr) and the others. Effect of operating parameters such as adsorption time, temperature, pH and ionic strength on the adsorption performance of MIL-101(Cr)-NO 2 was investigated. The TA adsorption capacity remarkably increases with increasing ionic strength adjusted by CaCl 2 . MIL-101(Cr)-NO 2 exhibits an adsorption capacity of 1619 mg/g, higher than that of the reported adsorbents, probably due to electrostatic interaction, π–π stacking interaction and Cr–O complexation interaction between MOF framework and TA. Adsorption isotherms and kinetic results are in accordance with Freundlich model and pseudo-second-order model, respectively. Moreover, the thermodynamics of TA adsorption on MIL-101(Cr)-NO 2 suggests an endothermic process.
✓ 已验证
DOI
高影响因子
ENVIRONMENTAL RESEARCH
·
2022
·
IF 8.431
Boyu Jia,Tianbao Liu,Juanjuan Wan,Andrei Ivanets,Yujia Xiang,Lijuan Zhang,Xintai Su
Microbial reduction of hexavalent chromium (Cr (VI)) shows better efficiency and cost-effectiveness. However, immobilization of Cr (III) remains a challenge as there is a limited supply of electron donors. A greener and cleaner option for donating external electrons was using bioelectrochemical systems to perform the microbial reduction of Cr(VI). In this system, we constructed a polydopamine (PDA) decorated Shewanella oneidensis MR-1 ( S. oneidensis MR-1) bioelectrode with bidirectional electron transport, abbreviated as PDA@ S. oneidensis MR-1. The conjugated PDA distributed on the intracellular and extracellular of individual S. oneidensis MR-1 has been shown to accelerate electron transfer by outer membrane C-type cytochromes and flavin-bound MtrC/OmcA pathway by various electrochemical analyses. As expected, the PDA@ S. oneidensis MR-1 biofilm achieved 88.1% Cr (VI) removal efficiency (RE) and 58.1% Cr (III) immobilization efficiency (IE) within 24 h under the autotrophic conditions at the optimal voltage (−150 mV) compared with the control potential (0 mV). The PDA@ S. oneidensis MR-1 biofilm showed increased RE activity was attributed to the shortening of the distance between individual bacteria by PDA. This research provides a viable strategy for in situ bioremediation of Cr(VI) polluted aquatic environment.
✓ 已验证
产品关联
DOI
PubMed
高影响因子
危险品化学品经营许可证（带存储）