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The mechanism of 2-chlorobiphenyl oxidative degradation by nanoscale zero-valent iron in the presence of dissolved oxygen.
Environ Sci Pollut Res Int. 2018 Jan; 25(3):2265-2272.ES

Abstract

It has recently been demonstrated that the addition of nanoscale zero-valent iron (nZVI) to oxygen-containing water or soil aquifers results in the oxidation of organic compounds. However, there has been little insight about the generation of the reactive oxygen species (ROS) that play a vital role in the transformation of contaminants in the presence of nZVI. This study investigated (i) the degradation of 2-chlorobiphenyl (2-CB) by nZVI; (ii) the generation and role of ROS in this process. Under anaerobic and aerobic conditions, the removal efficiency of 2-CB was 65.5 and 59.4%, respectively, after 4 h at a pH of 5.0. The results demonstrated that both the reductive and oxidative processes account for 2-CB degradation under aerobic conditions. Hydroxyl radicals (·OH) generated by nZVI at low pH could efficiently degrade 2-CB, the main reductive dechlorination product was biphenyl. Two other hydroxylation products (2-chlorophenol and 2-hydroxybiphenyl) were also examined. There was a higher degradation efficiency of 2-CB under acidic conditions than basic conditions because more ·OH was generated by nZVI. The presence of natural organic matters (NOMs), including humic acid (HA), salicylic acid (SA), galic acid (GA), and tannic acid (TA), increased the degradation efficiency of 2-CB (k values ranged from 0.0041 to 0.0042 min-1), because NOMs can mediate the electron transfer from the nZVI surface to O2, and facilitate the production of Fe2+ and H2O2 that subsequently form ·OH. The mechanisms of these processes have provided new insights into the role of nZVI in the transformation of organic compounds.

Authors+Show Affiliations

State Key Laboratory of Soil and Sustainable Agriculture, Institute of Soil Science, Chinese Academy of Sciences, Nanjing, 210008, China.State Key Laboratory of Soil and Sustainable Agriculture, 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. gdfang@issas.ac.cn.Nanjing Institute of Environmental Sciences, Ministry of Environmental Protection, Nanjing, 210042, China. pingfanshangren@126.com. Organic Food Development Center, Ministry of Environmental Protection, Nanjing, 210042, China. pingfanshangren@126.com.Department of Chemistry, Maseno University, Maseno, 40105, Kenya.Key Laboratory of Soil Environment and Pollution Remediation, Institute of Soil Science, Chinese Academy of Sciences, Nanjing, 210008, China.

Pub Type(s)

Journal Article

Language

eng

PubMed ID

29119491

Citation

Wang, Yu, et al. "The Mechanism of 2-chlorobiphenyl Oxidative Degradation By Nanoscale Zero-valent Iron in the Presence of Dissolved Oxygen." Environmental Science and Pollution Research International, vol. 25, no. 3, 2018, pp. 2265-2272.
Wang Y, Liu L, Fang G, et al. The mechanism of 2-chlorobiphenyl oxidative degradation by nanoscale zero-valent iron in the presence of dissolved oxygen. Environ Sci Pollut Res Int. 2018;25(3):2265-2272.
Wang, Y., Liu, L., Fang, G., Wang, L., Kengara, F. O., & Zhu, C. (2018). The mechanism of 2-chlorobiphenyl oxidative degradation by nanoscale zero-valent iron in the presence of dissolved oxygen. Environmental Science and Pollution Research International, 25(3), 2265-2272. https://doi.org/10.1007/s11356-017-0614-x
Wang Y, et al. The Mechanism of 2-chlorobiphenyl Oxidative Degradation By Nanoscale Zero-valent Iron in the Presence of Dissolved Oxygen. Environ Sci Pollut Res Int. 2018;25(3):2265-2272. PubMed PMID: 29119491.
* Article titles in AMA citation format should be in sentence-case
TY - JOUR T1 - The mechanism of 2-chlorobiphenyl oxidative degradation by nanoscale zero-valent iron in the presence of dissolved oxygen. AU - Wang,Yu, AU - Liu,Linhao, AU - Fang,Guodong, AU - Wang,Lei, AU - Kengara,Fredrick Orori, AU - Zhu,Changyin, Y1 - 2017/11/08/ PY - 2017/08/16/received PY - 2017/10/24/accepted PY - 2017/11/10/pubmed PY - 2018/11/8/medline PY - 2017/11/10/entrez KW - 2-chlorobiphenyl KW - Hydroxyl radicals KW - Nanoscale zero-valent iron KW - Oxidative degradation SP - 2265 EP - 2272 JF - Environmental science and pollution research international JO - Environ Sci Pollut Res Int VL - 25 IS - 3 N2 - It has recently been demonstrated that the addition of nanoscale zero-valent iron (nZVI) to oxygen-containing water or soil aquifers results in the oxidation of organic compounds. However, there has been little insight about the generation of the reactive oxygen species (ROS) that play a vital role in the transformation of contaminants in the presence of nZVI. This study investigated (i) the degradation of 2-chlorobiphenyl (2-CB) by nZVI; (ii) the generation and role of ROS in this process. Under anaerobic and aerobic conditions, the removal efficiency of 2-CB was 65.5 and 59.4%, respectively, after 4 h at a pH of 5.0. The results demonstrated that both the reductive and oxidative processes account for 2-CB degradation under aerobic conditions. Hydroxyl radicals (·OH) generated by nZVI at low pH could efficiently degrade 2-CB, the main reductive dechlorination product was biphenyl. Two other hydroxylation products (2-chlorophenol and 2-hydroxybiphenyl) were also examined. There was a higher degradation efficiency of 2-CB under acidic conditions than basic conditions because more ·OH was generated by nZVI. The presence of natural organic matters (NOMs), including humic acid (HA), salicylic acid (SA), galic acid (GA), and tannic acid (TA), increased the degradation efficiency of 2-CB (k values ranged from 0.0041 to 0.0042 min-1), because NOMs can mediate the electron transfer from the nZVI surface to O2, and facilitate the production of Fe2+ and H2O2 that subsequently form ·OH. The mechanisms of these processes have provided new insights into the role of nZVI in the transformation of organic compounds. SN - 1614-7499 UR - https://www.unboundmedicine.com/medline/citation/29119491/The_mechanism_of_2_chlorobiphenyl_oxidative_degradation_by_nanoscale_zero_valent_iron_in_the_presence_of_dissolved_oxygen_ L2 - https://dx.doi.org/10.1007/s11356-017-0614-x DB - PRIME DP - Unbound Medicine ER -