Radiation-induced reduction of diuron by gamma-ray irradiation

文献类型： 外文期刊

第一作者： Zhang, Jibiao

作者： Zhang, Jibiao;Zheng, Zheng;Zhao, Tan;Zhao, Yongfu;Wang, Lianhong;Zhong, Yun;Xu, Yue;Zhao, Yongfu

作者机构：

关键词： degradation;diuron;gamma-ray irradiation;mechanism

期刊名称：JOURNAL OF HAZARDOUS MATERIALS （ 影响因子：10.588； 五年影响因子：10.129 ）

ISSN：

年卷期：

页码：

收录情况： SCI

摘要： Diuron degradation efficiencies and the proposed mechanism by gamma-ray irradiation were investigated. Several factors that might affect the degradation values were further examined. The UV absorbances at 200-400 nm and diuron concentration decreased with the increase of radiation dose. When diuron initial concentration was 18.5 mgL~(-1) and 1.0kGy was selected as the radiation dose, diuron removal value and loss of total organic carbon were 100 and 34.1%, respectively. However, the concentration of Cl~- ion increased with the increase of radiation dose. The process could be depicted by first order reaction kinetics and the reaction was mainly caused by the reaction of diuron with ~·OH and e_(aq)~-. The degradation efficiency decreased with the increase of initial concentration at the same radiation dose. H_2O_2, HCO_3~-, NO_3~-, NO_2~-, CH_3OH and humic acid as additives reduced the degradation efficiency. Furthermore, the increase of NO_3~-, NO_2~-, CH_3OH and humic acid would result in the decrease of the degradation values. The pH value could affect the removal efficiency and the degradation process was enhanced in acid condition. The pH value became lower with increasing radiation dose after gamma-ray irradiation.

分类号： TB1

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