JOURNAL OF HAZARDOUS MATERIALS
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2019
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IF 7.65
Xiaoshu Lv,Xiaofeng Qin,Kaifeng Wang,Yiyin Peng,Peng Wang,Guangming Jiang
The scaled application of nanoscale zero-valent iron nanoparticles (nZVI or Fe° NPs) in environmental remediation is challenged by easy surface passivation and particle aggregation. To improve this situation and enhance their performance in Cr(VI) removal from water phase, we present one novel strategy to hybridize nZVI with layered double hydroxide (LDH) decorated reduced graphene oxide (rGO). The as-prepared ternary (Fe@LDH/rGO) composites possess better dispersibility, improved hydrophilicity and more positive surfaces that allows higher removal efficiency and capacity for Cr(VI) oxyanions. Composition proportion are optimized and influences of surroundings (solution pH, Cr(VI) concentration and temperature) are evaluated. Also, we demonstrate that Fe@LDH/rGO can be reused with suitable post-treatments, which combines alkaline solution desorption and NaBH 4 revivification possess. Cr desorption and Fe leaching ratio during regeneration should be critical indicators that determine the recovery efficiency. Synergistic effect within this ternary system not only contributes to its superiorities in stability, but also continuous iron corrosion via the formation of micro Fe-C batteries, where rGO acts as cathode and alternative electron conductor. The present work suggests great potentials of Fe@LDH/rGO composites in groundwater remediation.
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DOI
高影响因子
APPLIED SURFACE SCIENCE
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2018
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IF 4.439
Chongfei Yu,Pengyan Yang,Luna Tie,Siyu Yang,Shuying Dong,Jingyu Sun,Jianhui Sun
Herein, we demonstrate the design and fabrication of β-Bi 2 O 3 @ Bi 2 S 3 hollow microspheres with sheet-like hierarchical nanostructures targeting an advanced visible-light-responsive photocatalytic system. In comparison with pure Bi 2 S 3 and β-Bi 2 O 3 , the as-obtained β-Bi 2 O 3 @Bi 2 S 3 heterojunction photocatalyst exhibits a markedly enhanced sunlight photocatalytic activity towards the photo-degradation of rhodamine B. Following, the property of the β-Bi 2 O 3 @Bi 2 S 3 on the Cr 6+ photocatalytic reduction was then evaluated. Operating conditions such as β-Bi 2 O 3 @Bi 2 S 3 mass, tartaric acid concentration, and initial Cr 6+ concentration were analyzed. The results showed that a suitable reduction condition was selected as, β-Bi 2 O 3 @Bi 2 S 3 dosage 25 mg, initial concentration 20 mg·L −1 and molar ratio of Cr 6+ /tartaric acid 1:20. The outstanding photocatalytic performances of the hybrid photocatalyst are mainly attributed to the reduced recombination rates of photo-generated electrons/holes, enhanced light harvesting, increased active sites as well as the improved photo/chemical stability. Moreover, the photocatalytic mechanism of β-Bi 2 O 3 @Bi 2 S 3 for oxidation of RhB and reduction of Cr 6+ was investigated in detail. The enhanced photocatalytic activity and excellent chemical stability render the thus-fabricated heterostructure a promising candidate to remediate aquatic contaminants and meet the demands of future photocatalytic materials.
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DOI
高影响因子
MICROCHEMICAL JOURNAL
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2024
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IF 4.9
Jianmei Li,Qi Sun,Tuyatsetseg Jambal,Dulguun Dorjgotov,Na Su,Qiuju Wu,Jirimutu
To identify adulterated camel meat in emerging markets, there is an urgent need for sensitive, rapid, and convenient detection methods. In this study, a novel fluorescent sensing platform was developed to effectively identify pork components adulterated in camel meat by regulating the surface charge properties of MIL-101(Cr). Our data demonstrated that the modification of polyethylenimine (PEI) had minimal impact on the crystal structure of MIL-101(Cr). However, it significantly affected the adsorption behavior of MIL-101(Cr) towards 6-carboxyfluorescein (FAM) labelled DNA, thereby influencing the response of fluorescence quenching-recovery. Under optimal conditions, the proposed turn-on fluorescent biosensor, based on PEI-MIL-101(Cr) exhibited high sensitivity with a detection limit of 42 pM. It also demonstrated excellent selectivity for specific target DNA, successfully detecting a pork fraction of 0.45 % (w/w) in camel meat. This study was aimed to provide a fresh perspective on the potential application of functional materials derived from metal-organic frameworks in detecting food adulteration .
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DOI
高影响因子
CHEMICAL ENGINEERING JOURNAL
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2022
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IF 16.744
Yanfang Li,Kang Xu,Huilin Hu,Lixia Jia,Yizhong Zhang,Ciren Zhuoga,Pengli Yang,Xin Tan,Wanqian Guo,Weichang Hao,Tao Yu,Jinhua Ye
Constructing atomic-level cation vacancies is an effective strategy to modulate the electronic properties of host materials, thus promoting charge transfer and redox reaction kinetics. Herein, ultrathin Bi 24 O 31 Br 10 nanosheets with cationic vacancy was synthesized via an inventive precipitation strategy by adding appropriate arginine. The difunctional arginine can changes the pH of the synthetic system and selectively deprive Bi atoms on the surface to form Bi vacancies through strong affinity between functional groups and cations. The abundant Bi vacancy decrease the Gibbs free energy change and provide channels to promote bulk adsorption of Cr(VI), thus effectively reduces the carrier migration distance during in situ bulk photocatalytic reduction of Cr(VI) and induces the formation of new impurity states to improve the utilization of visible light. Bi vacancy mitigates strong excitonic effects confined by significantly reducing exciton binding energies, thus effectively promote the separation of photo-generated charges and suppress reorganization of photon-generated carrier. Benefiting from these merits, these exclusive V Bi -Bi 24 O 31 Br 10 ultra-thin nanosheets exhibit superior reduction performance for Cr(VI), and the removal rate was more than 90% at universal pH (2–10). This work provides a new idea for the construction of cation vacancies and a feasible method for the removal of Cr(VI) under alkaline conditions.
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DOI
高影响因子
JOURNAL OF PHOTOCHEMISTRY AND PHOTOBIOLOGY A-CHEMISTRY
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2019
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IF 3.261
Zhengquan Liu,Lan Yang,Min Chen,Quansheng Chen
In this work, a label-free fluorimetric method for sensitive and selective detection of Cr(III) was developed by utilizing NaY/GdF 4 :Yb,Er upconversion nanoparticles (UCNPs) and citrate-modified silver nanoparticles (Cit-AgNPs) mixed system. The photophysical and morphological properties of the prepared UCNPs were characterized by various spectroscopic and microscopic techniques. The fluorescence of amino-modified UCNPs can be quenched due to the Cr(III) induced aggregation of Cit-AgNPs by means of inner filter effect. The observed quenching in the fluorescence intensity of the UCNPs is found to be dependent on the concentration of Cr(III). The fluorescence decreases linearly within the investigated concentration of 0.5–40 μM Cr(III) with a limit of detection 34 nM. The practical applicability of the present sensing method is ascertained by detecting Cr(III) in spiked tap water and instant tea samples.
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高影响因子
JOURNAL OF COLLOID AND INTERFACE SCIENCE
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2021
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IF 8.128
Hua-Rong Yang,Shan-Shan Li,Chen Yang,Qing-Da An,Shang-Ru Zhai,Zuo-Yi Xiao
Here, we have developed a novel bilayer hollow amphiphilic biosorbent (BHAB-3) with large adsorption capacity, rapid adsorption kinetics, and cost-effective for the removal of Cr(VI) and Cu(II) from aqueous solutions. The synthesis was based on the clever use of freeze-drying to fix the structure, secondary modification of the carboxymethyl cellulose microspheres with polyethyleneimine and cross-linking by glutaraldehyde. The consequences of pH, initial concentration, contact time and temperature on adsorption were investigated. The Langmuir model fits showed that the maximum adsorption capacities of the two target heavy metal ions reached 835.91 and 294.79 mg/g, respectively. Moreover, BHAB-3 was characterized by SEM, FT-IR, TGA, and XPS synergistically, showing that it exhibits a strong complexation ability for Cu(II) and a strong electrostatic effect for Cr(VI). Adsorption and desorption experiments showed only a slight decrease in the adsorption capacity of the BHAB-3 for Cr(VI) and Cu(II) ions after 5 and 26 cycles, respectively. Given the excellent properties of this adsorbent, it is a promising candidate for heavy metal ion removal.
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高影响因子
SENSORS AND ACTUATORS B-CHEMICAL
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2015
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IF 4.097
Dongfang Wang,Yingchang Ke,Di Guo,Hongxu Guo,Jianhua Chen,Wen Weng
A metal-organic frameworks (MOFs), cauliflower-like MIL-100(Cr), has been facilely prepared through simple reflux method for the first time and characterized by XRD, FT-IR, SEM and XPS. The MOFs was found to be useful for the simultaneous and selective electrochemical detection of microgram Cd(II), Pb(II), Cu(II), and Hg(II) in aqueous solution. The detection was performed by the square wave anodic stripping voltammetry (SWASV). The MIL-100(Cr) modified electrode showed an excellent selectivity and stability for Cd 2+ , Pb 2+ , Cu 2+ , Hg 2+ determinations. The electrochemical properties and applications of the modified electrode were studied. Operational parameters such as pH, deposition potential and deposition time were optimized for the purpose of determination of traces of metal ions .
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高影响因子
ENVIRONMENTAL RESEARCH
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2025
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IF 7.7
Yuxuan Zhao,Yueli Wen,Xiaonuo Xu,Maohong Fan,Shiyun Guo,Zhiju Chen,Xiaoxiao Zhao,Bin Wang,Wei Huang
The heavy metals discharged from electroplating wastewater, represented as copper and chromium ions, is harmful to aquatic lives and human beings, and will break the ecological balance. In this work, magnetic hybrid porous structure adsorbent of Fe 3 O 4 @SiO 2 -UiO-66-EDTA is prepared for recycling copper and chromium ions. The adsorbent exhibits a maximum adsorption capacity of 212.10 mg/g for Cu(II) and 118.10 mg/g for Cr(VI). Notably, it shows excellent regenerability of 87.12% after 5 cycles. The adsorption of Cu(II) and Cr(VI) on Fe 3 O 4 @SiO 2 -UiO-66-EDTA follows the pseudo-second-order model, where chemical adsorption is dominant and it occurs spontaneously and exothermally. Based on XRD, FTIR, XPS, and DFT calculations, the adsorption mechanisms are driven by electrostatic attraction, chelation, and redox reactions. This work provides a novel and promising strategy for designing highly efficient adsorbents, paving the way for more effective treatments of electroplating wastewater contaminated with Cu(II) and Cr(VI).
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产品关联
DOI
PubMed
高影响因子
Journal of Environmental Chemical Engineering
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2024
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IF 7.4
Chuanjin Lin,Qia Guo,Bin Dong,Zuxin Xu
Sludge hydrochar used for chromium-contaminated soil remediation is susceptible to natural aging with soil minerals, which may alter its electrochemical properties and affect its remediation performance. In this study, the effect of co-aging with soil minerals (soluble mineral salts [FeCl 3 , MnCl 2 , AlCl 3 , and CaCl 2 ] and clay minerals [kaolinite]) on the redox activity of sludge hydrochar for Cr(VI) reduction was investigated. The subsequent aging process revealed that Fe 3+ and Al 3+ ions oxidized the stabilized alkanes to functional groups with high electron-donating capacities, such as -OH and C-O, because of their oxidizing properties or electron-mediating facilitated by the formation of the crystal structure, while enhancing the electron-donating and electron-mediating capacities of the co-aging hydrochar. However, Mn 2+ was easily oxidized to Mn(III) and Mn(IV), which protected alkanes from oxidation. Simultaneously, Ca 2+ and kaolinite were encapsulated on the hydrochar surface, hindering electron-mediating during oxidation. None of the three substantially enhanced the electron-donating capacity of the hydrochar during the co-aging process. Because of the richness of soil minerals, it is vital to consider redox reactions as a critical factor when applying hydrochar for soil remediation.
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高影响因子
APPLIED SURFACE SCIENCE
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2025
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IF 6.9
Bifang Zheng,Yi He,Shuangqin Tian,Shujie Wang,Lihong Tang
The combination of bamboo fiber (BF) with chitosan (CS) in aerogels to capture heavy metals from contaminated water has not yet been previously reported. In this study, we used a straightforward sol–gel followed by freeze-drying method to fabricate a biomass composite aerogel using waste BF and CS (BF/CSA). This material is low-cost, eco-friendly, and recyclable. In particular, the BF/CSA-2 exhibited excellent mechanical strength and strong acid resistance. It effectively adsorbed Cr(VI) at pH=2 and Cu(II) at pH=5, achieving removal efficiencies of 94% and 85%, respectively. The corresponding maximum adsorption capacities were 162.10 and 138.97 mg/g. BF/CSA-2 exhibited a high removal efficiency (>70 %) after five consecutive reuse cycles. The chemisorption mechanism was confirmed through adsorption isotherms and kinetic analysis. In addition, density functional theory (DFT) calculations revealed adsorption energies of −196.473 and −121.964 kcal/mol for Cr(VI) and Cu(II), respectively, on BF/CSA-2. Based on experimental characterization and theoretical calculations, the removal mechanism involves complexation, electrostatic attraction, and reduction. This study presents a promising advancement toward the development of scalable and sustainable biomass-based aerogels for water purification.
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产品关联
DOI
高影响因子
INDUSTRIAL & ENGINEERING CHEMISTRY RESEARCH
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2019
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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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高影响因子
CHEMICAL ENGINEERING JOURNAL
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2014
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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
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