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Effects of pH and gallic acid on the adsorption of two ionizable organic contaminants to rice straw-derived biochar-amended soils

文献类型： 外文期刊

作者： He, Ying 1 ; Yao, Ting 1 ; Tan, Shuo 1 ; Yu, Bingqi 1 ; Liu, Kailin 1 ; Hu, Lifeng 1 ; Luo, Kun 1 ; Liu, Min 1 ; Liu, Xiangy 1 ;

作者机构： 1.Hunan Agr Univ, Coll Plant Protect, Changsha 410128, Hunan, Peoples R China

2.Hunan Acad Agr Sci, Hunan Agr Biotechnol Res Inst, Changsha 410125, Hunan, Peoples R China

3.Collaborat Innovat Ctr Farmland Weeds Control, Changsha, Hunan, Peoples R China

关键词： Biochar; Ionizable organic contaminant; Adsorption; pH; Gallic acid

期刊名称：ECOTOXICOLOGY AND ENVIRONMENTAL SAFETY （ 影响因子：6.291； 五年影响因子：6.393 ）

ISSN： 0147-6513

年卷期： 2019 年 184 卷

页码：

收录情况： SCI

摘要： The existing form of ionizable organic contaminants (IOCs) could affect their adsorption characteristics to soil and biochar. In this study, 2 IOCs, namely, sulfadiazine and imazalil, were selected to study their adsorption by rice straw-derived biochar-amended soils, as well as the effect of pH and gallic acid on their adsorption. The results showed that the soil adsorption isotherms of the two ionizable organic contaminants could be fitted well by a linear equation and the Freundlich equation, and r(2) was more than 0.80. The adsorption coefficient (Kd) in the three kinds of soil ranged from 0.262 to 4.07 L kg(-1) for sulfadiazine and from 3.11 to 96.5 L kg(-1) for imazalil. After the addition of biochar, the adsorption of sulfadiazine and imazalil in the soil increased. The adsorption of sulfadiazine by biochar gradually decreased with the increase in pH; the adsorption of imazalil increased when the pH increased from 2 to 5 and then gradually decreased with increasing pH. Gallic acid enhanced the adsorption of the two IOCs to pure soil and biochar-amended soil.

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