SURFACE & COATINGS TECHNOLOGY
·
2025
·
IF 6.1
Sitian Zhu,Zhigang Xu,Qiang Shen,Chuanbin Wang,Lianmeng Zhang
In this study, Cr-ZrC composite coatings were fabricated for the first time via trivalent chromium (Cr(III)) electrodeposition, and the influence of current density on the microstructural evolution, microhardness, and tribological behaviors of the as-prepared coatings was systematically investigated. The results show that the composite coatings presented an amorphous matrix with uniformly dispersed ZrC particles, and an amorphous interface was observed between the Cr matrix and ZrC particles, which ensures robust interfacial bonding. The thickness of Cr-ZrC composite coatings and the content of ZrC particles both increase as current density rises. When the current density reached 20 A/dm 2 , the ZrC content attained a maximum of 15.55 vol% along with a coating thickness of 9.81 μm, and the coating prepared under this current density exhibited the highest microhardness of 1239.8 ± 20.7 HV, which was approximately 66.4 % higher than that of the pure Cr(III) coating (without ZrC incorporation). Tribological tests indicated that the Cr-ZrC composite coatings achieved optimal wear resistance at a current density of 16 A/dm 2 , with a friction coefficient of 0.43 and a wear rate of 9.75 × 10 −6 mm 3 ·N −1 ·m −1 under this condition. Collectively, these findings provide a critical theoretical and experimental basis for optimizing Cr-ZrC composite coatings and clarify the key regulatory mechanism of current density on their structure-property correlation.
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CHEMICAL ENGINEERING JOURNAL
·
2026
·
IF 13.2
Wensheng Lei,Minglin Sun,Wenliang Zhang,Liuan Liang,Zhezheng Ding,Xiao Tang,Haonan Dai,Xiaomin Liu,Pengfei Qi,Yan Wang
The efficient and sustainable removal of hexavalent chromium (Cr(VI)) from wastewater is a critical challenge in environmental engineering. Herein, an ultra-stable and recyclable cellulose nanofiber-based composite membrane (CNF@MN@MX) was fabricated via vacuum-assisted filtration by integrating cellulose nanofibers (CNFs), indium-based metal-organic frameworks (MIL-68(In)-NH₂, MN), and Ti₃C₂Tₓ MXene (MX). The CNFs provide a robust structural scaffold, MN imparts visible-light photoactivity, and MX establishes a highly conductive network that facilitates charge separation and transport. Comprehensive structural and photoelectrochemical characterizations confirmed strong interfacial coupling among the three components, leading to enhanced electron mobility and light-harvesting capacity. The optimized CNF@MN@MX membrane (mass ratio CNF:MN:MX = 1:1:1) exhibited a specific surface area of 22.65 m 2 /g, a maximum Cr(VI) adsorption capacity of 17.79 mg/g, and nearly complete Cr(VI) reduction under visible-light irradiation. Notably, the membrane retained over 70% removal efficiency after 20 regeneration cycles and maintained excellent performance in the presence of common anions. Density functional theory (DFT) calculations revealed that MX incorporation lowered the Gibbs free energy of Cr(VI) reduction from −1.19 to −1.72 eV, confirming the thermodynamic advantage of MX-facilitated electron transfer. Furthermore, the CNF@MN@MX membrane efficiently purified simulated industrial effluents, yielding residual Cr(VI) concentrations below the regulatory limit. This work provides a robust design strategy for constructing conductive, photoactive, and recyclable membrane systems for advanced heavy-metal wastewater treatment.
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POWDER TECHNOLOGY
·
2020
·
IF 4.142
Mengmeng Tian,Aijun Han,Songhua Ma,Xufei Zhu,Mingquan Ye,Xin Chen
BaCr x Ti 1- x O 3 ( x = 0.05, 0.07, 0.12, 0.15) pigment powders were synthesized by acrylamide modified sol-gel technique. The characterization results suggest the average particle size of the synthetic samples distributes from 64.5 nm to 85.6 nm and the color turns from yellow to yellow-green. The charge transfer of Ti 3d ↔ O 2p and the Ti 3d ↔ Cr 3d are majorly responsible for the color change. The NIR solar reflectance of the BaCr 0.07 Ti 0.93 O 3 pigment is up to 82.46%. The application experiment shows that comparing to the pure ASA (acrylonitrile-styrene-acrylate), the NIR solar reflectance of the modified ASA sample is improved by 52%, the inner surface temperature and heat absorption of the modified ASA sample are reduced by 5.5 °C and 26.8% respectively, and the aging resistance performance is improved by 4 times. In conclusion, the Cr-bearing BaTiO 3 pigments unfold potential to improve the aging resistance of ASA plastics.
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JOURNAL OF MATERIALS SCIENCE
·
2026
·Vol. 61
·期 15
·10173-10191
·
IF 4.4
Liu Zeng,Wu Fang,Zheng Liwei,Sun Xu,Xia Chenghui,Song Hongbing,Zhang Shuai,Qu Xiaofei,Shi Liang
Core–shell Bi 4 NbO 8 Cl@C plate-like heterostrutured photocatalysts were successfully prepared by one-step hydrothermal process, during which glucose solution exhibited reducibility and created amounts of oxygen vacancies for Bi 4 NbO 8 Cl, while a carbon layer was in situ deposited on Bi 4 NbO 8 Cl by glucose decomposition. The structure of Bi 4 NbO 8 Cl was stabilized and armored by the thickness-tailored C layer, which provides a superior performance in the removal of acidic Cr(VI)-contained contaminant water, and the optimal Bi 4 NbO 8 Cl@C achieved 373 folds than pristine Bi 4 NbO 8 Cl in photocatalytic Cr(VI) removal. Experimental results and density functional theory (DFT) calculations show that C layer is tightly coated on the surface of BNC. Furthermore, C–O covalent bonds, which act as electron transfer channels, are formed at the interface of BNC and C layer. This study provides an important reference for the synthesis of core–shell structured photocatalysts and the efficient removal of Cr(VI) from industry wastewater. Graphical
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Journal of Materials Chemistry A
·
2026
·
IF 9.2
Qianshuo Wang,Yanhao Dong,Tu Lan,Junke Ma,Yongzhi Shi,Shu Chen,Zhenwei Zhu,WEN WAN
Transition metal dichalcogenide (TMDC) flakes doped with aliovalent d-electron species provide an ideal platform for studying lithium extraction and intercalation. Drawing on design strategies for TMDC electrodes in rechargeable batteries, this work investigates Cr-doped TaSe2 (Cr0.1Ta0.9Se2) as a lithium-ion battery anode. Cr doping preserves the layered structure while introducing a dual reaction mechanism: an irreversible conversion reaction during the first discharge (contributing to high primary capacity) and a reversible intercalation process in subsequent cycles. Electrochemical tests show a high initial discharge capacity of 970 mAh g-1 at 32 mA g-1 with distinct voltage plateaus, along with stable cycling performance (222.4 mAh g⁻¹ after 500 cycles). Ex-situ XRD and XPS confirm structural evolution and Cr participation in the conversion reaction, consistent with mechanistic insights for rechargeable primary lithium batteries. This work demonstrates that targeted doping can effectively tailor TMDC electrochemistry, offering a promising route to high-capacity electrode materials with hybrid energy-storage mechanisms.
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LANGMUIR
·
2026
·
IF 4.4
Jianguo Bai,Yanchen Zhu,Linli Qin,Hao Ren,Muhammad Wajid Ullah,Huamin Zhai
The pervasive toxicity of hexavalent chromium (Cr(VI)) to aquatic life and humans urgently demands integrated platforms capable of simultaneous detection and remediation. Herein, a bifunctional platform (CMC/PEI/MIL-53(Fe)/Nap/CP) capable of simultaneous fluorescence detection and photocatalytic removal of Cr(VI) was constructed by in situ growing MIL-53(Fe) on a carboxymethyl cellulose/polyethylenimine (CMC/PEI) matrix grafted with naphthalimide and combining it with cellulose paper (CP). In situ growth ensures the uniform dispersion of active sites, while the paper-based design enhances processability and recyclability. The protonated amino groups of PEI enrich Cr(VI) through electrostatic interactions, while MIL-53(Fe) provides photocatalytic active sites through the Fe3+/Fe2+ redox cycle. Due to the synergistic effect of adsorption and photocatalysis, the removal efficiency reached 99% within 5 h, with a reduction rate of 96%, following pseudo-first-order kinetics (k = 0.9119 h–1). Compared to other recent studies, it offers an excellent removal performance. At the same time, the enrichment effect of PEI enhanced the interaction between Cr(VI) and the naphthalimide fluorophore, achieving a detection limit of 0.34 μM and a KSV of 8.73 × 103 M–1. The good selectivity for Cr(VI) was theoretically verified through simulations by using Materials Studio software (MS). This platform provides a practical bifunctional platform for efficient fluorescence detection and removal of Cr(VI), with broad application prospects in the fields of environmental monitoring and water treatment.
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PubMed
高影响因子
Journal of Environmental Chemical Engineering
·
2026
·Vol. 14
·期 6
·125013
·
IF 7.5
Wenjie Guo,Yinghua Lan,Wenbing Wu,Jien Niu,Yanmei Chen,Wenlong Xiang,Juan Xu,Yanhui Zhang
By combining the sol-gel method with the coprecipitation synthesis strategy, a series of cadmium sulfide-based catalysts (MTiO x -CdS, where M = Ce, Co, Cu, Zn) were successfully prepared. Under simulated sunlight irradiation, the material exhibited efficient and stable degradation performance for ciprofloxacin (CIP). Remarkably, by constructing a Cr(Ⅵ)-mediated redox system, a significant leap in degradation efficiency from nearly zero to 90% was achieved for bisphenol A (BPA) and ibuprofen (IBU). Studies reveal that Cr(Ⅵ) plays a dual role in this system, acting as both an "electron bridge" and an "adsorption anchor": on one hand, it serves as an electron acceptor to significantly inhibit charge carrier recombination; on the other hand, it enriches pollutants through coordination effects, thereby synergistically enhancing electron transfer and interfacial reactions. This work not only presents a cost-effective and efficient strategy for the synthesis of MTiO x -CdS photocatalysts but also offers valuable insights into the development of novel photocatalytic systems aimed at the remediation of complex water pollution and energy conversion applications.
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Journal of Materials Research and Technology-JMR&T
·
2026
·
IF 7.3
Ming Zhang,Zhanbo Li,Zihao Li,Jingjing Xie,Weimin Wang,Zhengyi Fu
B 4 C–TiB 2 composites with enhanced mechanical properties were fabricated by a hydrolysis-based coating process, followed by ball milling with stainless-steel media, and consolidated by reactive hot pressing. Milling with 9Cr18 stainless-steel balls introduced Fe–Cr debris, which generated a liquid phase during sintering, promoting the formation of coarse, plate-like (Ti,Cr)B 2 solid-solution grains and a newly formed FeB phase. The optimal flexural strength of 745.7 ± 37 MPa is achieved, attributed to solid-solution strengthening and improved microstructural homogeneity. Meanwhile, the highest fracture toughness and Vickers hardness of 5.40 ± 0.28 MPa m 1/2 and 37.4 ± 1.3 GPa are achieved when the milling time is prolonged to 3 h, representing a 27% and 9.67% improvement, respectively, compared to the composites without ball-milling treatment. These results demonstrate that controlled introduction of Fe–Cr debris by stainless-steel ball milling enables simultaneous enhancement of flexural strength, fracture toughness, and hardness in B 4 C–TiB 2 composites through liquid-phase sintering.
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PHYSICAL REVIEW B
·
2022
·Vol. 106
·期 23
·235151
·
IF 3.908
Gaofeng Ding,Hongliang Wo,Yiqing Gu,Yimeng Gu,Jun Zhao
The recently discovered kagome metal $A{\mathrm{V}}_{3}{\mathrm{Sb}}_{5}$ ($A=\mathrm{K}$, Rb, Cs) with intertwined superconductivity and charge density wave (CDW) order has attracted considerable interest. Here we investigate the evolution of CDW and superconductivity in $\mathrm{Cs}{({\mathrm{V}}_{1\ensuremath{-}x}{\mathrm{Cr}}_{x})}_{3}{\mathrm{Sb}}_{5}$, where chromium substitution for vanadium introduces extra electron carriers. Our experiments reveal that the CDW order is gradually suppressed under chromium doping, which can be understood from the band structure modifications induced by electron doping. This highlights the importance of the van Hove singularities near the $M$ and $L$ points for CDW instability. The anomalous Hall effect that is coupled with CDW in ${\mathrm{CsV}}_{3}{\mathrm{Sb}}_{5}$ only appears in lightly doped $\mathrm{Cs}{({\mathrm{V}}_{1\ensuremath{-}x}{\mathrm{Cr}}_{x})}_{3}{\mathrm{Sb}}_{5}$ and vanishes at $x\ensuremath{\ge}0.06$ when the CDW order remains relatively strong. Unlike hole- and isovalent-doped $A{\mathrm{V}}_{3}{\mathrm{Sb}}_{5}$, where superconductivity is enhanced upon suppression of CDW, superconductivity is rapidly suppressed under chromium doping, pointing to a conventional $s$-wave pairing.
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CHEMICAL ENGINEERING JOURNAL
·
2023
·
IF 15.1
Yusof A.Y.A. Mohammed,A.M. Abdel-Mohsen,Qi-Jun Zhang,Mohammad Younas,Lu-Bin Zhong,Jia-Cheng E. Yang,Yu-Ming Zheng
Hexavalent chromium Cr(VI) is one of the most toxic heavy metal ions. Therefore, the removal of this contaminant from wastewater is of particular importance. Herein, a novel zeolitic imidazolate framework (ZIF-8) nanoparticles based electrospun polyacrylonitrile (PAN)/polyethylenimine (PEI) nanofibrous composite membranes (NCMs) were prepared and characterized by SEM, XRD, FTIR, TGA and other characterization techniques. The NCMs were tested for the adsorption of Cr(VI) from water. Results showed that the inclusion of PEI tailored the surface of the NCM to be superhydrophilic. The prepared electrospun NCM showed a high adsorption capacity for Cr(VI) (up to 403.5 mg·g −1 ) under ZIF-8 concentration of 5 wt%. More importantly, introducing ZIF-8 up to 5 % did not only increase the adsorption capacity but also enhanced the thermal stability, mechanical strength, and structure of the NCM. The experimental analysis of co-existing ions and the reusability of up to ten cycles showed that the optimized PAN/PEI@ZIF-8 NCM exhibited good selectivity and excellent stability for wastewater treatment. The adsorption kinetics followed the pseudo-second-order model and the adsorption isotherm could be fitted well by the Langmuir model. Thermodynamics revealed that the adsorption process was spontaneous and endothermic. The adsorption mechanism was found to be mainly electrostatic attraction and reduction. This study demonstrated the potential of ZIF-8-incorporated PAN/PEI NCMs for the removal of Cr(VI) from water.
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Journal of the Taiwan Institute of Chemical Engineers
·
2023
·
IF 5.7
Meng Chen,Huawei Fang,Chao Wang,Jixiang Xu,Lei Wang
Background Solar-driven water splitting is regarded as one promising green way to produce H 2 . Photo-reduction of hexavalent chromium (Cr(Ⅵ)) to hypotoxic Cr(III) can control the Cr(VI)-induced pollution. A key in these processes is to develop a photocatalyst with high specific surface area, good light absorption and efficient charge carrier separation. Methods A Co-encapsulated N-doped carbon (Co@NC) was prepared by pyrolysis ZIF-8@ZIF-67 precursor to modify CdSe quantum dots (QDs). The obtained catalyst was used to reduce Cr(Ⅵ) and split water under visible light irradiation. Significant findings Modification CdSe with Co@NC made obtained Co@NC/CdSe possessing enhanced visible-light absorption and photoexcited charge separation. The optimal 2%Co@NC/CdSe exhibited the excellent Cr(Ⅵ) reduction performance with a rate constant of 0.28 min –1 in the absence of sacrificial agent, as well as high H 2 evolution rate of 6.48 mmol g –1 h –1 in 10% lactic acid solution. The H 2 O 2 and electrons were the active species to reduce Cr(VI). This work gives a beneficial insight for improving the photocatalytic activity of QDs.
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CHEMICAL ENGINEERING JOURNAL
·
2022
·
IF 16.744
Fenglei Liu,Shanshan Wang,Baowei Hu
Herein, a MXenes decorated nanoscale FeS composites were developed via electrostatic self-assembly strategy to achieve efficient U(VI)/Cr(VI) adsorption-reduction. Different analytical techniques were applied to adequately characterize all as-prepared materials to determine the formation of species with the desired morphology and properties. Results revealed that the special chemical structure of MXenes could improve the dispersion of FeS nano-particles and suppress its aggregation. Meanwhile, the adsorption data closely well tailored with the Langmuir isotherm and Pseudo-second-order equation, and the maximum removal efficiencies were 88.5 and 107.2 mg/g for uranium(VI) and chromium(VI). It was also found that the presence of other cations and anions had no obvious influence on removal of U(VI)/Cr(VI), whereas the elimination process was a spontaneous endothermic reaction . More importantly, according to the spectroscopic analysis and DFT calculation , both FeS and surface functional groups on Ti 3 C 2 @FeS-PDA/PEI exhibited strong chemical affinities to the targeted pollutants, while FeS could effectively reduce Uranium(VI) to Uranium(IV) and Chromium(VI) to Chromium(III). This work facilitated the omnidirectional improvement of MXenes-based materials for the de-pollution of practical radionuclide or heavy metals wastewater.
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