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Effective removal of Cr(VI) by attapulgite-supported nanoscale zero-valent iron from aqueous solution: Enhanced adsorption and crystallization.
Chemosphere. 2019 Apr; 221:683-692.C

Abstract

The attapulgite supported nanoscale zero-valent iron composite (AT-nZVI) was synthesized and used for Cr(VI) removal. X-ray diffraction (XRD) and transmission electron microscope (TEM) indicated that nZVI particles were well distributed and immobilized on the attapulgite surface. Batch experiments of Cr(VI) removal were conducted at varying mass ratios, initial Cr(VI) concentrations and kinetics. The results indicated that the removal efficiency of Cr(VI) by AT-nZVI approaches 90.6%, being greater than that by non-supported nZVI (62.9%). The removal kinetics could be more accurately explained using pseudo second order kinetics model. The composite exhibited a synergistic interaction instead of simple mixture of AT and nZVI. Reduction was the dominant mechanism at low concentrations as opposed to adsorption at high concentrations. FeCr2O4 was the main reduction product by AT-nZVI, which was attributed to the reduction of Cr(VI) by nZVI and co-precipitation of CrFe oxides on the surface of AT. In the meantime, Fe(II) ion contributed to 64% for the Cr(VI) removal, which resulted from the dissolution of nZVI during the removal process. From the analysis of XRD and XPS results, the crystallization of FeCr2O4 is believed to be formed easily after the reaction of the AT-nZVI composite with Cr(VI) which is more stable and greatly reduce the risk of secondary pollution compared with nZVI. The introduction of AT enhanced adsorption of Cr(VI) and crystallization of the products. The above results suggested that AT-nZVI could be a promising remediation material for Cr(VI)-contaminated groundwater.

Authors+Show Affiliations

Key Laboratory of Soil Environment and Pollution Remediation, Institute of Soil Science, Chinese Academy of Sciences, Nanjing 210008, China; University of Chinese Academy of Sciences, Beijing 100049, China.Key Laboratory of Soil Environment and Pollution Remediation, Institute of Soil Science, Chinese Academy of Sciences, Nanjing 210008, China. Electronic address: lbqian@issas.ac.cn.Key Laboratory of Soil Environment and Pollution Remediation, Institute of Soil Science, Chinese Academy of Sciences, Nanjing 210008, China; University of Chinese Academy of Sciences, Beijing 100049, China.Key Laboratory of Soil Environment and Pollution Remediation, Institute of Soil Science, Chinese Academy of Sciences, Nanjing 210008, China; University of Chinese Academy of Sciences, Beijing 100049, China.Key Laboratory of Soil Environment and Pollution Remediation, Institute of Soil Science, Chinese Academy of Sciences, Nanjing 210008, China.Key Laboratory of Soil Environment and Pollution Remediation, Institute of Soil Science, Chinese Academy of Sciences, Nanjing 210008, China. Electronic address: mfchen@issas.ac.cn.

Pub Type(s)

Journal Article

Language

eng

PubMed ID

30669110

Citation

Zhang, Wenying, et al. "Effective Removal of Cr(VI) By Attapulgite-supported Nanoscale Zero-valent Iron From Aqueous Solution: Enhanced Adsorption and Crystallization." Chemosphere, vol. 221, 2019, pp. 683-692.
Zhang W, Qian L, Ouyang D, et al. Effective removal of Cr(VI) by attapulgite-supported nanoscale zero-valent iron from aqueous solution: Enhanced adsorption and crystallization. Chemosphere. 2019;221:683-692.
Zhang, W., Qian, L., Ouyang, D., Chen, Y., Han, L., & Chen, M. (2019). Effective removal of Cr(VI) by attapulgite-supported nanoscale zero-valent iron from aqueous solution: Enhanced adsorption and crystallization. Chemosphere, 221, 683-692. https://doi.org/10.1016/j.chemosphere.2019.01.070
Zhang W, et al. Effective Removal of Cr(VI) By Attapulgite-supported Nanoscale Zero-valent Iron From Aqueous Solution: Enhanced Adsorption and Crystallization. Chemosphere. 2019;221:683-692. PubMed PMID: 30669110.
* Article titles in AMA citation format should be in sentence-case
TY - JOUR T1 - Effective removal of Cr(VI) by attapulgite-supported nanoscale zero-valent iron from aqueous solution: Enhanced adsorption and crystallization. AU - Zhang,Wenying, AU - Qian,Linbo, AU - Ouyang,Da, AU - Chen,Yun, AU - Han,Lu, AU - Chen,Mengfang, Y1 - 2019/01/12/ PY - 2018/11/11/received PY - 2019/01/04/revised PY - 2019/01/09/accepted PY - 2019/1/23/pubmed PY - 2019/4/20/medline PY - 2019/1/23/entrez KW - Adsorption KW - Attapulgite KW - Crystallization KW - Hexavalent chromium KW - Nanoscale zero-valent iron SP - 683 EP - 692 JF - Chemosphere JO - Chemosphere VL - 221 N2 - The attapulgite supported nanoscale zero-valent iron composite (AT-nZVI) was synthesized and used for Cr(VI) removal. X-ray diffraction (XRD) and transmission electron microscope (TEM) indicated that nZVI particles were well distributed and immobilized on the attapulgite surface. Batch experiments of Cr(VI) removal were conducted at varying mass ratios, initial Cr(VI) concentrations and kinetics. The results indicated that the removal efficiency of Cr(VI) by AT-nZVI approaches 90.6%, being greater than that by non-supported nZVI (62.9%). The removal kinetics could be more accurately explained using pseudo second order kinetics model. The composite exhibited a synergistic interaction instead of simple mixture of AT and nZVI. Reduction was the dominant mechanism at low concentrations as opposed to adsorption at high concentrations. FeCr2O4 was the main reduction product by AT-nZVI, which was attributed to the reduction of Cr(VI) by nZVI and co-precipitation of CrFe oxides on the surface of AT. In the meantime, Fe(II) ion contributed to 64% for the Cr(VI) removal, which resulted from the dissolution of nZVI during the removal process. From the analysis of XRD and XPS results, the crystallization of FeCr2O4 is believed to be formed easily after the reaction of the AT-nZVI composite with Cr(VI) which is more stable and greatly reduce the risk of secondary pollution compared with nZVI. The introduction of AT enhanced adsorption of Cr(VI) and crystallization of the products. The above results suggested that AT-nZVI could be a promising remediation material for Cr(VI)-contaminated groundwater. SN - 1879-1298 UR - https://www.unboundmedicine.com/medline/citation/30669110/Effective_removal_of_Cr_VI__by_attapulgite_supported_nanoscale_zero_valent_iron_from_aqueous_solution:_Enhanced_adsorption_and_crystallization_ L2 - https://linkinghub.elsevier.com/retrieve/pii/S0045-6535(19)30070-0 DB - PRIME DP - Unbound Medicine ER -