数字农科院2.0

Effect of H3PO4-modified biochar on the fate of atrazine and remediation of bacterial community in atrazine-contaminated soil

文献类型： 外文期刊

作者： Pingping Wang; Junli Cao; Liangang Mao; Lizhen Zhu; Yanning Zhang; Lan Zhang; Hongyun Jiang; Yongquan Zheng; Xingang Liu

作者机构：

关键词： Atrazine;Biochar;Phosphoric acid;Soil bacteria;Sorption

期刊名称： Science of the Total Environment

ISSN： 0048-9697

年卷期： 2022 年 851.0 卷

页码：

收录情况： SCIE（2022版） ; EI（2022版）

摘要： The application of chemically modified biochar is a promising strategy for the remediation of contaminated (e.g., pesticides) soil. In this study, H3PO4 was used to modify peanut shell to improve the remediation performance of biochar. Surface area (980.19 m2/g), pore volume (0.12 cm3/g), and the functional groups ([sbnd]OH, C[dbnd]O, and phosphorus-containing groups) on the biochar were increased by H3PO4 treatment. The sorption experimental data were well fitted by Freundlich model, while the sorption affinity (Kf) of H3PO4 modified biochar (PBC) for atrazine was 128 times greater than that of the untreated biochar (BC) in the aquatic systems. The Kf values of PBC-amended soil to atrazine were increased by 13.57 times than that of single soil. The strong sorption of PBC on atrazine delayed the degradation of atrazine in soil, and the residual percentage of atrazine in soil and soil-PBC mixture were 4.90% and 71.44% at the end of 60-day incubation, with the degradation half-life increased from 13.3 to 121.6 d. The analysis of high-throughput sequencing results showed that atrazine reduced the diversity of soil microbial community, but the abundance of microorganisms with degradation function increased and became dominant species. The addition of PBC in soil accelerated the microbial remediation of atrazine stress, which may promote the soil nitrogen cycle. Therefore, amendment of atrazine contaminated soil with PBC can reduce the environmental risk of atrazine and benefit the soil microbial ecology. © 2022

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