INORGANIC CHEMISTRY COMMUNICATIONS
·
2024
·
IF 4.4
Fuhua Wei,Fang Lan,Qinhui Ren,Hongliang Chen,Yutao Zhang,Zhao Liang
The Y/Cr-MOFs were synthesized via solvothermal treatment using 1, 3, 5-benzoic acid as the organic ligand and yttrium acetate hydrate and chromium acetate as the metal ions. The structures of the prepared Y/Cr-MOFs were characterized using FT-IR, XRD, TG, and SEM techniques. These characterized Y/Cr-MOFs were employed to investigate the adsorption efficiency of minocycline. Experimental findings indicate that minocycline adsorption by Y/Cr-MOFs follows both the second-order kinetic model and Freundlich isotherm. Within a span of 5 h, up to 90.4 % of minocycline can be adsorbed by Y/Cr-MOFs at pH 6. Moreover, a maximum removal capacity of minocycline reaching 506 mg/g was achieved with Y/Cr-MOFs. These results demonstrate the practical application potential of utilizing Y/Cr-MOFs for efficient minocycline adsorption.
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Desalination and Water Treatment
·
2024
·
IF 1
Fengli Shao,Shaoyu Zhou,Jiaxin Xu,Qiong Du,Jianqiu Chen,Jingge Shang
Nanoscale zero-valent iron (nZVI) has been proven to be more effective for the treatment of hexavalent chromium(Cr(VI)) when modified with the transition metal Cu. In this study, biochar-supported Cu/Fe bimetallic nanoparticles (Cu-nZVI/BC) were prepared and used for Cr(VI) removal from aqueous solution. The effects of the pH value, the initial concentration of Cr(VI), coexisting ions and humic acids (HA) were investigated. The compositional structures of Cu-nZVI/BC were analyzed by transmission electron microscopy, scanning electron microscopy, X-ray diffraction and X-ray photoelectron spectroscopy. The maximum removal efficiency of Cr(VI) was 50.57% (126.41 ± 3.75 mg g –1 ) for Cu-nZVI/BC at pH 2. The adsorption kinetic data were in agreement with the pseudo-second- order model, which confirmed that the adsorption step was a chemical adsorption and reduction process. The presence of Ca 2+ and NO 3 – had an inhibitory effect on Cr(VI) removal, while dHA increased the removal efficiency at high concentrations. This study proves that Cu-nZVI/BC removal of solution Cr(VI) is feasible and shows significant potential in practical applications.
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INDUSTRIAL & ENGINEERING CHEMISTRY RESEARCH
·
2015
·
IF 2.587
Meng Chen,Jiaqi Yan,Ying Tan,Yongfei Li,Zhimin Wu,Langsheng Pan,Yuejin Liu
Hydroxyalkylation of phenol with formaldehyde to bisphenol F was investigated over the metal–organic frameworks of MIL-100(Fe or Cr) and MIL-101(Fe or Cr) encapsulated with Keggin phosphotungstic acid (PTA). PTA@MIL-100(Fe or Cr)(β) and PTA@MIL-101(Fe or Cr)(β) with different β values (the molar ratio of W/M, where M = Fe or Cr) were prepared and characterized by XRD, BET, FT-IR, TG, SEM, TEM, and ICP. The research results showed that PTA@MIL-100(Fe or Cr)(β) had a higher catalytic activity than PTA@MIL-101(Fe or Cr)(β). PTA@MIL-100(Fe)(0.4) was the most effective among the studied catalysts and had excellent reusability. A 92.12% product yield and 93.01% selectivity for bisphenol F could be obtained over the PTA@MIL-100(Fe)(0.40) catalyst. The effects of the reaction time, reaction temperature, catalyst concentration, and phenol/formaldehyde molar ratio on the reaction performance were also investigated. A plausible mechanism for hydroxyalkylation of phenol with formaldehyde to bisphenol F was proposed.
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TRIBOLOGY INTERNATIONAL
·
2026
·
IF 7.6
Jiqi Xing,Xinze Zhu,Yupu Cao,Elissaios Stavrou,Juan Liu,Cheng Zhu
Molybdenum disulfide (MoS 2 ), a graphite-like layered two-dimensional material with excellent inherent lubricating properties, is commonly employed in dry vacuum environments. However, its lubrication performance deteriorates significantly under non-vacuum and humid conditions, limiting its broader practical applications. Cr doping has been shown to enhance the intrinsic anti-wetting properties of MoS 2 , enabling it to maintain favorable lubrication performance even in humid environments. Nevertheless, existing explanations for the anti-wetting mechanism of Cr-doped MoS 2 remain inconsistent with computational findings, and a clear molecular-level understanding is still lacking. This study supplementary developed high-precision all-atom force field parameters for the Cr-doped MoS 2 , with deviations of less than 1% from experimental test results and DFT-derived reference values, ensuring high reliability of subsequent simulations. The research found that neither single substitutional nor interstitial doping can match the crystallographic characteristics of materials prepared by the hydrothermal method, thus a mixed doping mode was proposed. Results suggest that when the ratio of substitutional to interstitial chromium atoms is 1:3, the simulated crystal characteristics achieve optimal consistency with experimental results; under this mode, the significant increase in shear modulus leads to a decrease in lubrication performance, which is consistent with experimental results. This manuscript investigates the intrinsic causes of friction performance variations in MoS 2 -based lubricating materials at the molecular level. It develops an empirical model correlating simulated mechanical properties and experimental average coefficient of friction (COF), laying a solid theoretical foundation for the subsequent molecular-level design of lubricants.
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ChemistrySelect
·
2026
·Vol. 11
·期 29
·e73937
·
IF 2.3
Yingjian Liao,Wenqi Xu,Liang Zeng,Songyun Deng,Xiaomao Hu,Song Lei,Linping Chen,Li li Geng,Shu Chen
Hexavalent chromium (Cr(VI)) is a highly toxic heavy metal contaminant commonly used in industrial applications, posing significant risks to human health and environmental sustainability due to its persistence and difficulty in degradation. Transition metal carbide (MXene) is an emerging two-dimensional material that has gained considerable attention for its potential in water pollutant removal. However, poor MXene stability and limited functional groups restrict its specific adsorption of target metal ions such as Cr(VI). Herein, a novel functionalized three-dimensional MXene composite gel (M/D/P) was synthesized via a photo-induced thiol-ene click reaction using MXene as the framework material. The multithiol-functionalized framework introduces abundant thiol groups, which facilitate the reduction of Cr(VI) to less toxic Cr(III) and enable chelation of Cr(III) with the adsorbent, driven by proton depletion during reduction. The adsorption behavior follows pseudo-second-order kinetics and the Langmuir model, indicating a chemical adsorption process. The maximum removal capacity reaches 347.71 mg·g − 1 , and the gel maintains 80% of its initial adsorption capacity after five cycles. The synergistic adsorption-reduction mechanism, involving electrostatic attraction, reduction, covalent bonding, and chelation, highlights M/D/P as a promising MXene-based adsorbent for water treatment applications. Graphical A multithiol-functionalized MXene composite gel (M/D/P) is synthesized via photo-induced thiol-ene click reaction. The abundant thiol groups enable synergistic adsorption–reduction of Cr(VI) through electrostatic attraction, chemical reduction, and chelation. The material achieves 374.71 mg·g − 1 removal capacity with excellent reusability.
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INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
·
2026
·
IF 9.2
Yachao Huang,Hailong Zhong,Qihong Zhou,Wenqi Feng,Huan Li,Jinming Zeng,Chao Liu,Xiaopeng Qi
Developing a bifunctional catalyst that combines low cost and high performance for water electrolysis remains an unsolved challenge. In this study, a Cr-doped transition metal-based electrocatalytic material is synthesized on a stainless steel mesh substrate. The obtained Cr 0.2 -CoP/SS catalyst exhibits an overpotential of only 98 mV for the hydrogen evolution reaction (HER) at 10 mA cm −2 in alkaline electrolyte, and exhibits an overpotential of 254 mV for the oxygen evolution reaction (OER); in acidic electrolyte, the HER overpotential at 10 mA cm −2 is as low as 118 mV, and it demonstrates excellent stability. Furthermore, when Cr 0.2 -CoP/SS is used in traditional overall water splitting systems, the required voltage at 10 mA cm −2 is as low as 1.56 V. Theoretical studies show that Cr doping reduces the Gibbs free energy of hydrogen adsorption and narrows the bandgap to zero, which enhances catalytic activity and structural stability.
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Polymers
·
2021
·Vol. 13
·期 7
·1035
·
IF 4.329
Chengbing Yuan,Yan Zhang,Jinshui Yao,Qinze Liu,Fan-Gong Kong
Herein, a synthetic strategy for a rough microsphere Cr(VI)-adsorbent via the reaction of tannic acid (TA) and 1,6-hexanediamine (HA) and using polyethylene glycol (PEG) as surface modifier was presented. This adsorbent was characterized by a Fourier Transform Infrared spectrometer (FTIR), thermogravimetic analysis (TGA), X-ray photoelectron spectroscopy (XPS), etc. Certain factors, including contact time, PEG@poly(tannin-1,6-hexanediamine) (PEG@PTHA) dosage, initial concentration, and experimental temperature affecting the Cr(VI) adsorption performance of adsorbent were explored. PEG@PTHA can adsorb Cr and the Cr(VI) was reduced up to Cr(III) due to the existence of phenolic hydroxyl groups. Its adsorption capacity can reach up to 300 mg/g within 10 min and approximately 100% removal percentage below the initial concentration of 100 mg/L. Its behavior matched well with the Langmuir isotherm model and pseudo-second-order kinetic model. A PEG@PTHA adsorbent with maximum adsorption capacity (450 mg/g) has great prospects in Cr(VI)-sewage treatment.
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COLLOID AND POLYMER SCIENCE
·
2026
·
IF 2.9
Chen Sihao,Cao Wei,Li Hao,Han Meng,Shi Wenhai,Liao Xiaobin,Zhou Zhenming
The interaction between new pollutants microplastics(MPs) and toxic heavy metals in a coexisting environment could alter both their environmental behavior and effects. Polyamide (PA) MPs show affinity toward highly toxic Cr(VI), thus the interaction mechanism needs to be further understood. Herein, PA MPs aged with different methods such as ultraviolet irradiation in air/sea water and chemical chlorination, were used to explore their adsorption and reduction performance and mechanism toward Cr(VI) under different solution conditions. The research results show that after aging treatment, the content of amide bonds in PA MPs decreased, while the number of oxygen containing functional groups increased. Under the condition of pH 3.0, the adsorption capacity reaches its maximum value. Higher temperatures facilitate the adsorption process, whereas the presence of salinity and dissolved organic matter (DOM) considerably hampers adsorption. The behavior of PA MPs in adsorption aligns with the pseudo-second-order kinetic model as well as the Langmuir adsorption isotherm model. Further studies show that the binding of Cr(VI) to PA MPs is primarily achieved through electrostatic interactions, complexation, and hydrogen bonding. It is important to mention that PA MPs have the ability to convert Cr(VI) to Cr(III) in solution, even in conditions involving UV light, the presence of DOM, and environments lacking oxygen. UV aging enhanced the adsorption and reduction performance of PA MPs for Cr(VI). This research offers fresh scientific insights into the mechanisms of formation and the environmental interactions related to pollution caused by microplastic-heavy metal composites. Graphical abstract
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INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
·
2023
·
IF 7.2
Hongyi Li,Yanli Wang,Huijun Liu,Lingxu Yang,Zhengliang Liu,Chaoliu Zeng
Excellent Cr diffusion resistance and interface stability is essential for coatings applied on the surface of ferrite stainless steel interconnect for SOFCs. Four kinds of materials, the equimolar (MnFeCoNiCu) 3 O 4 (Eq), non-equimolar (Mn 0·272 Fe 0·272 Co 0·272 Ni 0·092 Cu 0.092 ) 3 O 4 (Non-Eq), MnCo 2 O 4 (MC) and the Quaternary (MnFeCoNi) 3 O 4 (Quaternary), are combined with chromium oxide to form diffusion couples in order to study the interfacial reaction mechanism. The constitutes and morphologies of the samples are tested. Two different composition reaction layers are found in equimolar/Cr 2 O 3 diffusion couple. A slight Cr inward diffusion is detected in Quaternary/Cr 2 O 3 diffusion couple.
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BULLETIN OF ENVIRONMENTAL CONTAMINATION AND TOXICOLOGY
·
2022
·Vol. 110
·期 1
·1-7
·
IF 2.807
Gu Xinfeng,Mo Huijing,Wang Lei,Zhang Lianyi,Ding Zhuhong
Transport of Cr(VI) at the presence of bentonite colloid was carried out in saturated porous media of 16–18 mesh and 40–60 mesh sand columns. Effects of flow rate, pH, ion strength, humic acid and bentonite concentrations on Cr(VI) migration were investigated. The results show that the increase of flow rate accelerated the breakthrough of Cr(VI) and BP, but the transport mass of dissolved Cr(VI) decreased by ~ 15.0% when flow rate increased to 2.5 ml min −1 . Increasing IS to 10mM resulted in decrease of Cr(VI) transport mass by 6.86%–21.4%. Increase of pH and decrease of bentonite concentration favored the transport of dissolved Cr(VI). Humic acid had little effect on transport amount of Cr at pH7. Cr(VI) transport was dominated by the dissolved Cr(VI). The transport data of dissolved Cr(VI) were well described by the two-site model. The presence of BP reduced total Cr(VI) transport mass in co-transport.
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PubMed
高影响因子
E-POLYMERS
·
2022
·Vol. 22
·期 1
·938-948
·
IF 3.074
Xin Wang,Peng Li,Guifang Wang,Li Zhao,Huiling Cheng
The Cr( vi ) ion-imprinted composite membranes (Cr( vi )-IICMs) were prepared by using the surface imprinting method. The template ion was Cr( vi ), the functional monomer was 4-vinylpyridine (4-VP), and the nylon filter membrane (nylon-6) was the support membrane. Non-imprinted composite membranes (NICMs) were prepared under the same conditions as the corresponding Cr( vi )-IICM. The adsorption effect of the imprinted membrane can reach 2.4 times that of the corresponding non-imprinted membrane. Meanwhile, the adsorption quantity of Cr( vi )-IICM was 34.60 μmol·g −1 . The physical characteristics of membranes were confirmed by Brunauer–Emmett–Teller and scanning electron microscopy. Inductively coupled plasma emission spectrometry was used to analyze their adsorption properties and permeation selectivity. Cr( vi )-IICM and NICM were both mesoporous materials from the structural characterization and performance test results. Their adsorption behavior conformed to the Langmuir isotherm adsorption model. The permeation recognition mechanism of Cr( vi )-IICM was the Piletsky’s gate model. The IICM still has excellent permeability selectivity to Cr( vi ) in the presence of competitive ions. The results provided a reference for the isolation and enrichment of Cr( vi ).
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ENVIRONMENTAL RESEARCH
·
2023
·
IF 8.3
Junjun Ma,Tao E,Shuyi Yang,Liang Chen,Ying Cheng,Jia Yu,Yun Li
Stabilizing Cr(III) in tannery sludge (TS) via harmless method has always been the goal of environmental pollution treatment. In this study, a simple method to stabilize Cr(III) in TS is proposed via adding kaolin, based on the fact a large amount of organic matter contained in TS. Comprehensive characterizations confirm that kaolin can stabilize Cr(Ⅲ) via its abundant –OH and lamellar structure. Moreover, there are hydrogen bond interactions and ligand exchange-surface complexation between organic matter and kaolin, which is more conducive to form a stable ternary complex with Cr(III), in a state of organic matter-Cr(III)-kaolin. Simultaneously, the BCR sequential extraction experiment shows that the unstable water and acid soluble state of Cr(III) are reduced (from 0.61% to 0.35%), which further indicates that the stabilization of Cr(III) is successful.
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PubMed
高影响因子
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