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Journal of Chemistry
Volume 2019, Article ID 9585140, 5 pages
https://doi.org/10.1155/2019/9585140
Research Article

Kinetic Study of Biodangerous Methylmercury Degradation under Various Light Conditions

1Engineering Technology Center of Control and Remediation of Soil Contamination of Provincial Science & Technology Bureau, Anshun University, Anshun, Guizhou 561000, China
2College of Resource and Environmental Engineering, Anshun University, Anshun, Guizhou 561000, China
3College of Elemental Education, Jining University, Jining, Shandong 273100, China
4Zoucheng Senior School of Vocational Technology, Jining, Shandong 273500, China

Correspondence should be addressed to Yutao Zhang; moc.621@6150tyz and Qiuyun Zhang; moc.621@gnahzyq_ics

Received 5 June 2019; Accepted 15 July 2019; Published 25 July 2019

Guest Editor: Hu Li

Copyright © 2019 Yutao Zhang et al. This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.

Abstract

Methylmercury (MeHg) has remarkable toxicological effects on humans, plants, and other lives in the environment, which may restrict the comprehensive utilization of biomass source in view of possibly forming biohazardous waste. In this study, a kinetic study of MeHg degradation under UVB, UVA, natural light, and dark was carried out. The result showed that light radiation enhanced MeHg degradation but had no significant influence on the final balance between MeHg and inorganic mercury (Hg2+) in pure water. The balance is of great importance and can be used as a key fundamental to estimate MeHg cycling in other complicated aquatic environments. MeHg degradation was identified to be second-order reaction using the fitting optimization level of the regression equation, and the second-order rate constants were 1.61, 0.82, and 0.91 L·ng−1·d−1, half-lives were calculated to be 0.62, 1.3, and 1.08 d for UVB, UVA, and natural light, respectively. A possible MeHg degradation mechanism was proposed, and it could perfectly explain the results obtained in this paper and some previous studies.