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Optimizing the removal of nitrate from aqueous solutions via reduced graphite oxide-supported nZVI: synthesis, characterization, kinetics, and reduction mechanism.
Environ Sci Pollut Res Int. 2019 Feb; 26(4):3932-3945.ES

Abstract

Graphene has been considered an ideal absorbent and excellent carrier for nanoparticles. Reduced graphite oxide (rGO)-supported nanoscale zero-valent iron (nZVI@rGO) is an effective material for removing nitrate from water. nZVI@rGO nanocomposites were prepared by a liquid-phase reduction method and then applied for nitrate-nitrogen (NO3--N) removal in aqueous solution under anaerobic conditions. The experimental results showed that the stability and activity of the nZVI@rGO nanocomposites were enhanced compared with those of nZVI. The influence of the reaction conditions, including the initial concentration of NO3--N, coexisting anions, initial pH of the solution, and water temperature, on NO3--N removal was also investigated by batch experiments. In a neutral or slightly alkaline environment, 90% of NO3--N at a concentration less than 50 mg/L could be removed within 1 h, and nitrogen production was approximately 15%. The process of NO3--N removal by nZVI@rGO fits well with different reaction kinetics. In addition, magnetite was the main oxidation product. RGO-supported nZVI might become a promising filler in the permeable reactive barrier process for groundwater remediation.

Authors+Show Affiliations

State Key Laboratory of Geohazard Prevention and Geoenvironment Protection, Chengdu University of Technology, 1#, Dongsanlu, Erxianqiao, Chengdu, 610059, Sichuan, People's Republic of China. pushengyan@gmail.com. Department of Civil and Environment Engineering, The Hong Kong Polytechnic University, Hong Kong, People's Republic of China. pushengyan@gmail.com.State Key Laboratory of Geohazard Prevention and Geoenvironment Protection, Chengdu University of Technology, 1#, Dongsanlu, Erxianqiao, Chengdu, 610059, Sichuan, People's Republic of China.State Key Laboratory of Geohazard Prevention and Geoenvironment Protection, Chengdu University of Technology, 1#, Dongsanlu, Erxianqiao, Chengdu, 610059, Sichuan, People's Republic of China.State Key Laboratory of Geohazard Prevention and Geoenvironment Protection, Chengdu University of Technology, 1#, Dongsanlu, Erxianqiao, Chengdu, 610059, Sichuan, People's Republic of China.State Key Laboratory of Geohazard Prevention and Geoenvironment Protection, Chengdu University of Technology, 1#, Dongsanlu, Erxianqiao, Chengdu, 610059, Sichuan, People's Republic of China.State Key Laboratory of Geohazard Prevention and Geoenvironment Protection, Chengdu University of Technology, 1#, Dongsanlu, Erxianqiao, Chengdu, 610059, Sichuan, People's Republic of China.Department of Civil and Environment Engineering, The Hong Kong Polytechnic University, Hong Kong, People's Republic of China.

Pub Type(s)

Journal Article

Language

eng

PubMed ID

30547335

Citation

Pu, Shengyan, et al. "Optimizing the Removal of Nitrate From Aqueous Solutions Via Reduced Graphite Oxide-supported nZVI: Synthesis, Characterization, Kinetics, and Reduction Mechanism." Environmental Science and Pollution Research International, vol. 26, no. 4, 2019, pp. 3932-3945.
Pu S, Deng D, Wang K, et al. Optimizing the removal of nitrate from aqueous solutions via reduced graphite oxide-supported nZVI: synthesis, characterization, kinetics, and reduction mechanism. Environ Sci Pollut Res Int. 2019;26(4):3932-3945.
Pu, S., Deng, D., Wang, K., Wang, M., Zhang, Y., Shangguan, L., & Chu, W. (2019). Optimizing the removal of nitrate from aqueous solutions via reduced graphite oxide-supported nZVI: synthesis, characterization, kinetics, and reduction mechanism. Environmental Science and Pollution Research International, 26(4), 3932-3945. https://doi.org/10.1007/s11356-018-3813-1
Pu S, et al. Optimizing the Removal of Nitrate From Aqueous Solutions Via Reduced Graphite Oxide-supported nZVI: Synthesis, Characterization, Kinetics, and Reduction Mechanism. Environ Sci Pollut Res Int. 2019;26(4):3932-3945. PubMed PMID: 30547335.
* Article titles in AMA citation format should be in sentence-case
TY - JOUR T1 - Optimizing the removal of nitrate from aqueous solutions via reduced graphite oxide-supported nZVI: synthesis, characterization, kinetics, and reduction mechanism. AU - Pu,Shengyan, AU - Deng,Daili, AU - Wang,Kexin, AU - Wang,Miaoting, AU - Zhang,Ying, AU - Shangguan,Lixiang, AU - Chu,Wei, Y1 - 2018/12/13/ PY - 2018/06/18/received PY - 2018/11/20/accepted PY - 2018/12/14/pubmed PY - 2019/5/21/medline PY - 2018/12/15/entrez KW - Denitrification KW - Groundwater remediation KW - Nitrate KW - Reduced graphite oxide KW - nZVI@rGO SP - 3932 EP - 3945 JF - Environmental science and pollution research international JO - Environ Sci Pollut Res Int VL - 26 IS - 4 N2 - Graphene has been considered an ideal absorbent and excellent carrier for nanoparticles. Reduced graphite oxide (rGO)-supported nanoscale zero-valent iron (nZVI@rGO) is an effective material for removing nitrate from water. nZVI@rGO nanocomposites were prepared by a liquid-phase reduction method and then applied for nitrate-nitrogen (NO3--N) removal in aqueous solution under anaerobic conditions. The experimental results showed that the stability and activity of the nZVI@rGO nanocomposites were enhanced compared with those of nZVI. The influence of the reaction conditions, including the initial concentration of NO3--N, coexisting anions, initial pH of the solution, and water temperature, on NO3--N removal was also investigated by batch experiments. In a neutral or slightly alkaline environment, 90% of NO3--N at a concentration less than 50 mg/L could be removed within 1 h, and nitrogen production was approximately 15%. The process of NO3--N removal by nZVI@rGO fits well with different reaction kinetics. In addition, magnetite was the main oxidation product. RGO-supported nZVI might become a promising filler in the permeable reactive barrier process for groundwater remediation. SN - 1614-7499 UR - https://www.unboundmedicine.com/medline/citation/30547335/Optimizing_the_removal_of_nitrate_from_aqueous_solutions_via_reduced_graphite_oxide_supported_nZVI:_synthesis_characterization_kinetics_and_reduction_mechanism_ L2 - https://dx.doi.org/10.1007/s11356-018-3813-1 DB - PRIME DP - Unbound Medicine ER -