Scientific Reports
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2025
·Vol. 15
·期 1
·1-16
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IF 3.9
Zhang Fengrong,Liu Luxing,Zhang Cuilan,Shang Dawei,Wu Lishun
A novel adsorbent ZnAl–LDHs/SiO 2 (ZA/SiO 2 ) was prepared by blending urea mixture of ZnSO 4 and Al 2 (SO 4 ) 3 while using SiO 2 as a support form. The adsorption properties of ZA/SiO 2 for the removal of toxic metal ions (Cu(II) and Cr(VI)) from water were evaluated. By batch experiment method to investigate the ZA/SiO 2 adsorption of Cu(II) and Cr(VI) solution treatment effect. The sorption kinetics curves of Cu(II) and Cr(VI) on ZA/SiO 2 were L-shaped. What’s more, the solid concentration effect was found in the process of sorption kinetics. Langmuir and Freundlich sorption isotherm models were used to analyze the adsorption data. The results showed that the adsorption conforms to Langmuir and Freundlich adsorption isotherm models. However, the adsorption capacity of ZA/SiO 2 compounds for Cu(II) and Cr(VI) is greatly improved. The adsorption capacity of Cu(II) is 158 mg·g −1 and of Cr(VI) is 176 mg·g −1 , which were 3.6 and 1.8 times of ZnAl-LDHs (ZA), respectively. Density functional theory (DFT) was utilized for the analysis of intrinsic mechanism and specific pathways. The primary mechanism for removing Cr(VI) from water mainly included the intercalation of Cr 2 O 7 2− and exchange between Cr 2 O 7 2− and OH − , excluding Cr(OH) 3 precipitation. Regarding the primary mechanism for eliminating Cu(II) from water, it involves isomorphic substitution as the predominant process, except for the formation of Cu(OH) 2 precipitates.
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高影响因子
APPLIED SURFACE SCIENCE
·
2024
·
IF 6.3
Yan Zheng,Jinshu Lu,Xuan Wang,Tianbo Jia,Jinyi Cai,Dingkai Zhou,Yuexin Qian,Yamin Fu,Chunyang Zhai,Hengcong Tao,Yingtang Zhou,Shunli Li
Seawater splitting to produce hydrogen holds promise for renewable energy but faces challenges from chloride ions, causing electrode corrosion and competition between chlorine oxidation reaction (ClOR) and oxygen evolution reaction (OER). Therefore, it is crucial to develop highly efficient and stable electrocatalysts for seawater splitting. Here, we employ a dual-doping strategy of Mo/Cr cations and a sulfuration approach to fabricate the S-MoCr-NiFe@NF bifunctional catalyst with a 3D nano-flower structure. The S-MoCr-NiFe@NF catalyst exhibits remarkable catalytic performance for the oxygen evolution reaction (OER) in 1.0 M KOH + 0.5 M NaCl and 1.0 M KOH + Seawater, achieving current densities of 10 mA cm −2 at low overpotentials of 116 and 141 mV, respectively. Furthermore, it was demonstrated that the S-MoCr-NiFe@NF catalyst exhibited remarkable performance in alkaline overall seawater splitting, requiring only 1.48 and 1.57 V to achieve current densities of 10 mA cm −2 in 1.0 M KOH + 0.5 M NaCl and 1.0 M KOH + Seawater, respectively. The in-situ Raman and DFT calculations confirm Ni as the primary active sites, reducing the energy barrier of the rate-determining step and enhancing OER performance. This study will offer a viable approach to developing and creating highly effective bifunctional catalysts for seawater splitting.
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SEPARATION AND PURIFICATION TECHNOLOGY
·
2024
·
IF 8.1
Hiba Shaghaleh,Yousef Alhaj Hamoud,Qin Sun,Mohamed S. Sheteiwy,Hamada AbdElgawad
Soil flushing and adsorption-based soil remediation are promising options for removing heavy metals in agricultural soil. However, they encounter limitations in low removal efficiency, secondary pollution potential, or the need for a purification/recovery process. Optimizing flushing solutions or the functional properties of adsorbents could fundamentally eliminate the drawbacks of these methods. Yet, their practical application remains a formidable challenge. Herein, a new combined remediation strategy of multiple-pulse water soil flushing (MF) with novel aminated cellulose nanofibers (A-NFCs)/AEM/AM@MIL-100(Fe) nanocomposite hydrogel adsorbent (ANCMH) was adopted to remove Cr(VI) from agricultural soil. The characteristic analyses approved Cr(VI) adsorption-coupled reduction/swelling-based mechanisms on ANCMH with the maximum theoretical adsorption capacity of 338.24 mg g −1 at pH 6.8 governed by pseudo-second-order and Freundlich models. Instead of conventional MF application using environmentally problematic extractant fluids, a 5-day soil column simulation trial of MF coupled with ANCMH adsorbent layers (MF@ANCMH) was applied in medium-to-highly Cr(VI)-contaminated soil followed by easy ANCMHs separation, preventing secondary pollution. Innovatively, the water flushing-stop flux events favorably decreased the pH of neutral soil by 0.83 folds and allowed Cr(VI) release from the soil matrix to be adsorbed by ANCMHs, achieving a high Cr(VI) removal efficiency of 98.9 %. Compared to the soil treated with ANCMH individually and soil flushed with water or Na 2 EDTA, the MF@ANCMH-treated soil reached the corresponding regulation of permissible levels for Cr(VI) residential scenarios in agricultural soil of 5.6 ppm with 3-cycles of ANCMH reuse. The residual Cr in MF@ANCMH-remediated soil displayed minimal bioavailability at root-zoon soil of ≤4.2 ppm and a 97.66 % reduction in its exchangeable-carbonate fraction compared to untreated soil, corresponding to a risk assessment code score below 1 %. Also, the application of MF@ANCMH resulted in Cr bioaccumulation below 0.1 ppm in cultivated wheat plants, prevented the physiological phytotoxicity symptoms, and elevated their antioxidant enzyme activity, photosynthesis, growth, and yielding indicators compared to that grown in untreated soil. Furthermore, it improved soil organic matter, microbial community, diversity, and microecological functions. This study provides a promising alternative remediation strategy for neutral soil that can maintain soil/crop quality and soil health with high chemical/environmental stability of pollutants after remediation, demonstrating its sustainability and feasibility in agricultural soil.
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JOURNAL OF ALLOYS AND COMPOUNDS
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2025
·
IF 6.3
Xin Tang,Ruipeng Mao,Fan Zhang,Yongzhong Jin,Wei Su,Wu Jiang,Junhao Wang
Cemented carbides play a pivotal role in diverse industrial sectors, and controlling abnormal grain growth and regulating the homogeneity of the Co binder phase are the key challenges to improve their properties. In this study, WC-10Co alloy was prepared for the first time by low-pressure sintering technique using (Ti, Cr, V, Nb, Mo)(C, N) high entropy powder as an inhibitor, focusing on the effect of trace additions of (Ti, Cr, V, Nb, Mo)(C, N) on the microstructure and mechanical properties of the alloy as well as friction and wear properties. The results show that under the conditions of sintering at 1420 ℃, a pressure of 3 MPa, and a holding time of 1 hour, the alloy with 0.2 wt.% high-entropy inhibitor exhibited the best comprehensive properties, with a flexural strength of 3752 MPa, a Vickers hardness of 1679 HV 30 , and a fracture toughness of 13.07 MPa·m 1/2 . During the stable stage of tribological testing, the average friction coefficient reached 0.6195, and the wear rate was as low as 1.34×10 -7 mm 3 /(N·m). The toughening and strengthening mechanism of the (Ti, Cr, V, Nb, Mo)(C, N) - modified alloy is mainly attributed to the significant refinement of WC grains, WC lattice contraction, and the formation of Co-based solid solutions by the high-entropy inhibitor. However, excessive addition deteriorates the overall performance. This study provides experimental data and technical insights for the development of a new generation of cemented carbides with high strength, high toughness, and excellent wear resistance.
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SEPARATION AND PURIFICATION TECHNOLOGY
·
2025
·
IF 9
Haoruo Xu,Chenxi Huang,Weili Yu,Ningjie Fang,Yinghao Chu,Jinhui Li
The combined pollution toxicity of hexavalent chromium heavy metal (Cr(VI)) and antibiotics (such as ofloxacin, OFL) is much higher than that of a single pollutant, posing a serious challenge to the ecological environment. Photocatalytic technology can achieve the removal of both single pollutants and composite pollutants. It is urgent to develop catalysts with high carrier separation efficiency and photocatalytic degradation performance. In this work, we successfully prepared m-PDI/BiOI heterojunction catalysts (mPB-3) with tight contact interfaces using the continuous ion layer adsorption and reaction method, and applied them to the synergistic removal of OFL and Cr(VI). The results showed that mPB-3 exhibited a bidirectional enhancement effect. The degradation rate of OFL reached more than 99.5 % within 40 min, the corresponding reduction efficiency of Cr(Ⅵ) reached 63.7 % at pH = 9. Furthermore, the influence of different environmental factors on the degradation process have also been clarified, indicating that mPB-3 has good stability and adaptability. The system characterization results confirmed that a S-scheme heterojunction has been formed. This can accelerate the rapid migration of electrons from m-PDI to BiOI, achieving efficient charge separation, and ultimately enhancing the photocatalytic activity. Finally, the degradation intermediate products and degradation mechanism were analyzed. This study provides a feasible solution for the design of efficient photocatalytic materials and their application in the combined pollution treatment of OFL and Cr(VI). Environmental implication Cr(VI) and OFL coexisting in water bodies pose significant ecological risks due to their enhanced combined toxicity. Traditional treatment techniques often struggle to effectively address such complex pollution systems. This study demonstrates that the m-PDI/BiOI heterojunction photocatalyst can efficiently synergistically remove both contaminants under environmentally relevant conditions (e.g., pH = 9), providing a practical strategy to mitigate composite pollution challenges. The S-scheme charge separation mechanism offers insights for designing advanced catalysts to tackle emerging multi-pollutant threats in aquatic ecosystems, supporting sustainable water treatment solutions.
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WATER AIR AND SOIL POLLUTION
·
2025
·Vol. 236
·期 10
·1-20
·
IF 3
Hu Wei,Zhang Jun
This study investigated the adsorption characteristics of Cr(VI) and methyl orange (MO) onto polyethyleneimine (PEI) cryogels. The morphology and physicochemical properties of this prepared adsorbent were characterized with various techniques. Its adsorption behaviors towards MO and Cr(VI) were systematically investigated. In single-component systems, PEI cryogels exhibited significant adsorption capacities for Cr(VI) (875 mg/g) and MO (1777 mg/g), respectively. In binary systems, the cryogels demonstrated a stronger affinity for Cr(VI) than for MO. Column adsorption studies in single-component systems explored the effects of bed height, flow rate, and inlet concentration using breakthrough curves, with the modified dose–response model proving effective in describing these curves. Moreover, repeated dynamic adsorption experiments highlighted that the cryogels exhibited exceptional reusability. Results from column adsorption in binary systems indicated that the presence of MO did not significantly affect the adsorption of Cr(VI), while the presence of Cr(VI) enhanced the affinity of the cryogels for MO adsorption. The adsorption mechanism of PEI cryogels towards Cr(VI) primarily involved electrostatic attraction and reduction, whereas for MO, it predominantly entailed electrostatic attraction and hydrogen bonding. These findings collectively emphasize the significant potential of PEI cryogels for treating dyeing wastewater.
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JOURNAL OF MOLECULAR STRUCTURE
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2025
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IF 4.7
Yonghang Li,Yuhong Ma,Difan Lin,Fuyan Su,Qingfeng Cai,Wei Wang,Hongyu Lu,Hua Zou
Near-infrared II (NIR-II, 1000–1700 nm) luminescent materials are essential for NIR spectroscopy applications, including biometrics, night vision imaging, and chemical composition analysis. However, achieving thermally stable and ultra-broadband emission under ultraviolet-to-visible (UV–Vis) excitation remains a significant challenge. In this work, a high-efficiency NIR-II phosphor was reported by codoping Cr³⁺ and Ni²⁺ ions into the LiGaSiO₄ lattice, where Cr³⁺ serves as a sensitizer and Ni²⁺ acts as the primary emitter. Owing to the strong absorption of Cr³⁺ in the violet region and its efficient energy transfer to Ni²⁺, the LiGaSiO₄:Cr³⁺/Ni²⁺ phosphor exhibits intense NIR-II emission under 419 nm excitation, with a peak centered at 1250 nm and a full width at half maximum (FWHM) of 227 nm. The material also demonstrates excellent thermal stability, retaining 73.3 % of its luminescence intensity at 393 K. Using a commercial 405 nm LED as the excitation source and a custom-engineered NIR-II spectroscopic detection platform, this phosphor enables functional group-specific differentiation of organic solvents and facilitates quantitative analysis of ethanol–water and NaCl–water binary systems across a broad concentration range. These findings highlight the potential of LiGaSiO₄:Cr 3+ /Ni 2+ as a robust NIR-II probe for next-generation portable sensing technologies, paving the way for the practical deployment of NIR-II photonics systems in industrial and biomedical applications.
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COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS
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2024
·
IF 4.9
Wenqiang Wang,Guanghui Zhang,Lihua Dong,Ping Gu,Shiyuan Ding,Lian Hou
Persistent toxic heavy metal Cr(Ⅵ) oxyanions is increasingly damaging to the environment and human life safety. In this study, a novel tertiary amine chloride type cationic covalent organic framework with high yield (>95%) was synthesized using a one-step Schiff base reaction by room temperature standing two functional monomers . The adsorbent was characterized by SEM, EDS , FTIR , NMR , PXRD , BET, TGA and pH PZC . And a series of adsorption experiments were conducted to verify the removal effect for Cr(Ⅵ). It exhibited excellent adsorption performance and the adsorption equilibrium time was within 10 min, superior to most adsorbents. The adsorption conformed to the pseudo-second-order kinetics and the Langmuir adsorption isothermal models based on the values of R 2 and RMSE in the corresponding four models. The impact of pH was significant, and the maximum adsorption capacity was 161.4 mg/g at a pH of 2. The adsorbent had good adsorption selectivity for Cr(Ⅵ) oxyanions in the presence of coexisting ions (Cl − , SO 4 2− , NO 3 − , and PO 43 − ), and good recyclability with only decrease of removal rate from 98.3% to 91.5% after five cycles. The mechanism for Cr(Ⅵ) adsorption was mainly attributed to ion exchange, and hydrogen bonding also played a subordinate role. In the Cr(Ⅵ)-MO binary system, the increase for Cr(VI) adsorption results from the new active sites in methyl orange. This work highlights the mild synthetic conditions, fast adsorption rate, and good adsorption of Cr(Ⅵ), which make it a promising prospect.
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APPLIED CATALYSIS B-ENVIRONMENTAL
·
2022
·
IF 24.319
Shihui Wang,Yuzhou Xia,Guiyang Yan,Meixia Chen,Xuxu Wang,Ling Wu,Ruowen Liang
Inspired by the concept of frustrated Lewis pairs (FLPs) from homogeneous catalysis, an organic supramolecular bridged metal-organic frameworks (MOFs) heterojunction, i.e., a perylene-3,4,9,10-tetracarboxylic diimide@MIL-125(Ti)-NH 2 (denoted PDI@MTi) composite is successfully fabricated via a two-step synthesis method. Experimental characterisations and theoretical calculations reveal that in the obtained “TiO 5−x -ligand-PDI” FLPs, the unsaturated Ti-O clusters function as a Lewis acid to accept photogenerated electrons, and the PDI sites act as a Lewis base to capture photogenerated holes. With the unique structure characteristics, the PDI@MTi shows excellent photocatalytic activity toward the disinfection of Staphylococcus aureus and Cr(VI) reduction, with 1.0- and 10.3-fold enhancements, respectively, compared with unadorned MTi. The synergic effects of the micro polarisation field, multiple active sites, and a C-N bonded interface contributed to photoactivity enhancement. This work demonstrates the potential of using MTi as a platform for constructing FLPs-containing heterogeneous photocatalysts and provides new strategies to control carrier separation.
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高影响因子
INDUSTRIAL & ENGINEERING CHEMISTRY RESEARCH
·
2019
·
IF 3.375
Changjun Liu,Yingming Zhu,Kequan Mu,Qiang Liu,Hairong Yue,Wei Jiang
This work presents a strategy to convert the Cr(VI) pollutant in wastewater into active Cr catalysts in one step by simultaneous photoreduction and deposition using ZrO2 nanoparticles as the photocatalyst and support. Both highly dispersed Cr(0) and Cr2O3 were found on the surface of the resultant Cr/ZrO2 catalyst after UV irradiation. After photoreduction treatment, no residual chromium was detected in post-treated water. The resultant Cr/ZrO2 was found to be an active catalyst for selective dehydrogenation of ethane. It is slightly more stable and active than that prepared by the impregnation method. The interconversion between the structures of Cr–O–Cr and Cr═O should be the active site for oxidative dehydrogenation of C2H6 with CO2. An ethylene yield as high as 17.0% was achieved at 650 °C. This work proved that producing supported metal catalysts from the corresponding metal contaminated wastewater via proper one-step procedure, such as photoreduction treatment, is a feasible strategy to meet the ever-increasing stringent environmental requirements with better economic efficiency.
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CHEMICAL ENGINEERING JOURNAL
·
2014
·
IF 4.058
Zhi-yun Kong,Jun-fu Wei,Yong-hua Li,Na-na Liu,Huan Zhang,Yue Zhang,Li Cui
The quaternary ammonium fibers which could remove Cr(VI) ions rapidly were prepared by radiation-induced grafting of 2-(dimethylamino)ethyl methacrylate (DMAEMA) onto polypropylene (PP) fibers (PP-g-DMAEMA) and modifying with 1-bromoalkanes. The FTIR, FESEM, XPS and TG-DTG spectra manifested that the quaternary ammonium group was introduced onto the surface of PP fibers. The main factors influencing the adsorption of Cr(VI) ions including contact time, pH of the aqueous solution and adsorption dosage were investigated. The removal rate could reach 97% within 4 min and the kinetics study indicated that adsorption process was surface reaction controlled. Maximum adsorption capacities of Cr(VI) ions at 25 °C were 105.8 mg/g based on the Langmuir isotherms. These results suggested that the quaternary ammonium fibers have potential application for the removal of hazardous metal pollutants from wastewater highly and rapidly.
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高影响因子
CHEMICAL ENGINEERING JOURNAL
·
2021
·
IF 13.273
Zhiliang Chen,Yaoyu Luo,Chuixiu Huang,Xiantao Shen
Designing a novel type of imprinted photocatalysts for selective photoreduction of highly toxic pollutants is extremely needed in semiconductor photocatalysis. In this work, imprinted photocatalysts (named ZnO/GO-MIPs) were synthesized via Pickering emulsion polymerization by in situ assembling ZnO/GO composites on the synthetic molecular receptors (MIPs). The experimental data showed that the ZnO/GO-MIPs owned specific affinity towards the target Cr(VI) in aqueous solution with an imprinting factor ( IF ) of 1.6. Under the illumination of visible light, the ZnO/GO composites could selectively photoreduce the Cr(VI) adsorbed by the MIPs. In comparison with the ZnO/GO catalysts under light illumination, the ZnO/GO-MIPs showed a 15 fold increase in photoreduction of Cr(VI). Mechanism study indicates the photoreduction of Cr(VI) by the ZnO/GO composites was occurred at the interface between the solid MIP core and the aqueous solution. Compared to the ZnO-MIPs and the GO-MIPs, the ZnO/GO-MIPs clearly showed interfacial synergistic catalysis effect. To the best of our knowledge, this is first time that selective photoreduction of highly toxic pollutants at the solid-water interface by the ZnO/GO-MIPs was achieved. We believe the ZnO/GO-MIP catalysts have great potential in interfacial synergistic catalysis in environment and catalysis fields.
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