SCIENCE OF THE TOTAL ENVIRONMENT
·
2020
·
IF 6.551
Jingling Huang,Weizhao Yin,Ping Li,Huaitian Bu,Sihao Lv,Zhanqiang Fang,Mingjia Yan,Jinhua Wu
In this study, nitrate mediated biotic zero-valent iron (Fe 0 ) corrosion was employed to enhance cadmium (Cd) removal from groundwater . In comparison with a 17.5% Cd(II) removal treated with abiotic Fe 0 , a 3.9 times higher Cd(II) removal of 86.2% was recorded in the nitrate-mediated biotic Fe 0 system. Solids phase characterization confirmed that biogenic minerals such as green rust and iron sulfide could be formed in the nitrate-amended biotic Fe 0 system, offering large amount of adsorption sites for Cd(II) removal. The decrease of nitrate concentration and the competition with cathodic hydrogen for biological nitrate reduction by extra organic substance such as sodium acetate both showed significant inhibition on Cd(II) removal, further proving that hydrogenotrophic denitrification was the main mechanism for enhanced Cd(II) removal. Besides, a relatively high Cd(II) removal efficiency was observed over a pH range of 5–8, and it increased with declining pH values. These results demonstrated that the bio-amended iron corrosion technology coupled Fe 0 -assisted H 2 production with hydrogenotrophic denitrification exhibited excellent Cd(II) removal capacity, which enabled this technology a promising potential for Cd(II)-contaminated groundwater treatment and an alternative strategy for Cd(II) and nitrate co-contaminated groundwater remediation .
研究领域:
环境科学
·
环境工程
·
微生物学
·
水污染治理
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生物地球化学
✓ 已验证
DOI
高影响因子
Desalination and Water Treatment
·
2024
·
IF 1
Wei-fang Chen,Weipeng Lu,Sijia Zhang,Xiaobing Xie,Fei-fei He,Zai Chen
Starting with sucrose and ferrous chloride, nanoparticles of iron encapsulated in carbon structure were synthesized using a carbothermal method. The effects of carbothermal temperature, treatment time, Fe:sucrose mass ratio on the properties of the nanoscale zero-valent iron supported activated carbon were investigated. Temperatures ranged from 500°C to 1,100°C and treatment time used was 0.5, 1 and 3 h. Mass ratios of Fe and sucrose were 1:2, 1:4 and 1:8, respectively. Materials thus obtained were mostly powdered. X-ray diffraction patterns indicate that zero-valent iron was successfully produced from reduction of iron oxides. Iron was incorporated into the carbon structure. Hexachlorobenzene was employed as the target substance to test the material’s application. The optimum synthesis condition which resulted in a more than 95% HCB removal was carbothermal temperature of 700°C, treatment time of 1 h and mass ratio of Fe:sucrose of 1:4.
研究领域:
环境化学
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材料科学
·
环境污染治理
·
纳米材料
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环境工程
✓ 已验证
DOI
高影响因子
Journal of the Taiwan Institute of Chemical Engineers
·
2014
·
IF 2.637
Fenglian Fu,Min Hu,Bing Tang,Weijiang Han,Zihang Cheng
Chromium is a contaminant commonly found in water and soil because of its widespread use in various industries. Hexavalent chromium (Cr(VI)) is known to be highly toxic and carcinogenic, and the removal of Cr(VI) has attracted much scientific attention. In this paper, with the aid of polyoxometalate (POM), Cr(VI) removal increased significantly by acid-washed zero-valent iron (ZVI) under acid conditions in air. POM can mediate the electron transfer from ZVI surface to O 2 with enhancing the generation of H 2 O 2 , which is favorable for the removal of Cr(VI). The effects of iron loadings, POM concentrations, and initial pH values on the removal of Cr(VI) in ZVI/POM/air system were investigated and reaction mechanism was studied. Results indicated that POM is an efficient catalyst for Cr(VI) removal by acid-washed ZVI.
研究领域:
环境科学
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水处理技术
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污染控制化学
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环境工程
·
无机化学
✓ 已验证
DOI
高影响因子
RSC Advances
·
2019
·Vol. 9
·期 59
·34658-34670
·
IF 3.049
Xiangyu Wang,Yu Xie,Jun Ma,Ping Ning
The two-stage removal process of tetracycline (TC) in aqueous solutions using a novel photocatalyst based on nano-zero-valent iron (NZVI), g-C3N4 and expanded graphite by carbon layer (EGC) is reported for the first time. The composite (NZVI/g-C3N4@EGC) exhibits remarkable adsorption, reduction ability and visible light activity over the reaction course. Compared with pristine g-C3N4 (25.9%) and pure NZVI (45.9%), NZVI/g-C3N4@EGC achieves high degradation efficiency of TC (98.5%) due to the formation of a heterogeneous photo-Fenton system. This study shows that synergistic effects are achieved in the reaction system, including maintaining the reduction ability of NZVI and enhancing the photocatalytic activity of g-C3N4 by facilitating the separation of photogenerated electrons (e−) and holes (h+). TC removal involved a two-stage process of adsorption–reduction and photo-degradation. The quencher experiments determined that holes (h+) and superoxide radicals (˙O2−) are the major reactive species in the degradation of TC. The degradation pathways of TC were proposed based on the analysis of the intermediates. In addition, NZVI/g-C3N4@EGC revealed a high stability in a five-cycle test and good magnetic properties for facile separation from aqueous solutions. From an application viewpoint, NZVI/g-C3N4@EGC has favorable prospects in the direction of the photocatalytic degradation of antibiotic wastewater.
研究领域:
环境化学
·
材料科学
·
光催化
·
水污染治理
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纳米复合材料
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抗生素降解
✓ 已验证
DOI
高影响因子
WATER SCIENCE AND TECHNOLOGY
·
2016
·Vol. 73
·期 11
·2815-2823
·
IF 1.064
Zha Yiming,Zhou Ziqing,He Haibo,Wang Tianlin,Luo Liqiang
Nanoscale zero-valent iron (nZVI) incorporated with nanomagnetic diatomite (DE) composite material was prepared for catalytic degradation of methylene blue (MB) in heterogeneous Fenton system. The material was constructed by two facile steps: Fe 3 O 4 magnetic nanoparticles were supported on DE by chemical co-precipitation method, after which nZVI was incorporated into magnetic DE by liquid-phase chemical reduction strategy. The as-prepared catalyst was characterized by scanning electron microscopy, Fourier-transform infrared spectroscopy, X-ray diffraction, magnetic properties measurement and nitrogen adsorption–desorption isotherm measurement. The novel nZVI@Fe 3 O 4 -diatomite nanocomposites showed a distinct catalytic activity and a desirable effect for degradation of MB. MB could be completely decolorized within 8 min and the removal efficiency of total organic carbon could reach to 90% after reaction for 1 h.
研究领域:
环境化学
·
材料科学
·
催化化学
·
环境污染治理
·
纳米材料应用
✓ 已验证
DOI
高影响因子
WATER SCIENCE AND TECHNOLOGY
·
2015
·Vol. 73
·期 2
·329-336
·
IF 1.106
Zha Yiming,Wang Tianlin
In this work, boron nitride nanoplates (BNNPs) supported nanoscale zero-valent iron (nZVI) was prepared through facile liquid-phase chemical reduction of ferric ion by borohydride under ambient conditions in the presence of BNNPs. The nZVI@BNNPs hybrids were characterized by scanning electron microscopy, X-ray diffraction and magnetic properties measurement. The hybrid material was evaluated for decolorization of a common azo dye, methyl orange (MO), with the assistance of ultrasonic irradiation. Results exhibited that a complete decolorization of 100 mg/L MO was achieved within 6 min using nZVI@BNNPs as the active material. Compared with bare nZVI and BNNPs, nZVI@BNNPs provided a faster reaction process for MO decolorization. The kinetic rate constants of MO decolorization reached 0.8175 min −1 under ultrasound-assisted condition due to the synergistic effect of ultrasonic irradiation. Fluorescence spectrum experiment confirmed that hydroxyl radicals could be generated in the system combined nZVI with ultrasonic irradiation, and as a result, hydroxyl radicals would contribute to the decolorization process of MO.
研究领域:
环境化学
·
纳米材料科学
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水污染治理
·
声化学
·
环境功能材料
✓ 已验证
DOI
高影响因子
Polymer Chemistry
·
2015
·Vol. 6
·期 26
·4794-4800
·
IF 5.52
Hui Zhu,Gaojian Chen,Zhenbiao Zhang,Nianchen Zhou,Weidong Zhang,Xiulin Zhu
Fe(0) powder-catalyzed one-pot reaction was successfully employed to design linear and star polymers in a well-controlled manner by combining ambient temperature living radical polymerization and click chemistry. The polymerization behavior possessed the characteristics of “living”/controlled radical polymerization: the first-order kinetic plots, narrow molecular weight distribution (PDI < 1.4), the linear relationship between molecular weights and the monomer conversions and the successful chain-extension with a NIPAAM monomer. Furthermore, the NMR and MALDI-TOF-MS data indicated that the Fe(0)-catalyzed one-pot strategy is different from our reported Cu(0)-catalyzed one-pot strategies to make the targeted polymers.
研究领域:
高分子化学
·
材料科学
·
有机合成
·
纳米功能材料
·
药物递送系统
✓ 已验证
DOI
高影响因子
ADVANCED POWDER TECHNOLOGY
·
2022
·Vol. 33
·期 11
·103807
·
IF 4.969
Jingxi Zhang,Yifan Niu,Yu Zhou,Shaohua Ju,Yongwan Gu
In this study, green tea was used as a reducing agent to prepare GT-nZVI/Cu nano-zero-valent iron-copper bimetallic materials for nitrate degradation. Through single factor experiments, the process conditions for nitrate removal by GT-nZVI/Cu were optimized. By measuring the contents of nitrate, nitrite, and ammonia nitrogen in the reaction products, the reduction pathway of nitrate-nitrogen in GT-nZVI/Cu was studied. In addition, the removal mechanism of nitrate by GT-nZVI/Cu was also analyzed by scanning electron microscopy (SEM), energy dispersive spectroscopy (EDS), X-ray photoelectron spectroscopy (XPS), Fourier transform infrared spectroscopy (FTIR) and kinetic experiments. The results showed that the size of GT-nZVI/Cu particles is between 50 and 70 nm, and they are irregular spherical shapes. The polyphenol antioxidants in green tea make GT-nZVI/Cu have stronger antioxidant properties, and the denitration products are mostly nitrogen. The addition of copper ions accelerates the reaction time and reaction rate. The maximum removal rate of nitrate by GT-nZVI/Cu within 75 min can be up to 99 %. After three repeated experiments, the removal rate of GT-nZVI/Cu can still reach 70 %. The removal mechanism of GT-nZVI/Cu has enhanced nitrate removal through complexation, redox, and adsorption co-precipitation. This study provides a new route for the green preparation and efficient application of nZVI.
研究领域:
环境化学
·
纳米材料科学
·
水处理技术
·
环境功能材料
·
污染控制化学
·
应用催化
✓ 已验证
DOI
高影响因子
危险品化学品经营许可证（带存储）