Biochar characteristics produced from rice husks and their sorption properties for the acetanilide herbicide metolachlor

文献类型： 外文期刊

第一作者： Huang, Yufen

作者： Huang, Yufen;Li, Yanliang;Huang, Lianxi;Huang, Qing;Liu, Zhongzhen;Wei, Lan;Huang, Yufen;Li, Yanliang;Huang, Lianxi;Huang, Qing;Liu, Zhongzhen;Mar, Nyo Nyo

作者机构：

关键词： Rice husk;Biochar;Adsorption;Metolachlor;Pyrolysis temperature;Adsorptionmechanism

期刊名称：ENVIRONMENTAL SCIENCE AND POLLUTION RESEARCH （ 影响因子：4.223； 五年影响因子：4.306 ）

ISSN：

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收录情况： SCI

摘要： Rice husk biochar (RHBC) was prepared for use as adsorbents for the herbicide metolachlor. The characteristics and sorption properties of metolachlor adsorbed by the RHBC prepared at different pyrolysis temperatures were determined by analysis of physico-chemical characteristics, Fourier transform infrared spectroscopy (FTIR), Boehm titration, scanning electron microscopy (SEM), and thermodynamics and kinetics adsorption. With increasing pyrolysis temperature, the RHBC surface area greatly increased (from 2.57 to 53.08 m(2) g(-1)). RHBC produced at the highest temperature (750 degrees C) had the greatest surface area; SEM also showed the formation of a porous surface on RH-750 biochar. The sorption capacity of RHBC also increased significantly with increasing pyrolysis temperature and was characterized by the Freundlich constant K-f for the adsorption capacity increasing from 125.17-269.46 (pyrolysis at 300 degrees C) to 339.94-765.24 (pyrolysis at 750 degrees C). The results indicated that the surface area and pore diameter of RHBC produced with high pyrolysis temperature (i.e., 750 degrees C) had the greatest impact on the adsorption of metolachlor. The FTIR, Boehm titration, and SEM analysis showed that the greatest number of surface groups were on RHBC produced at the lowest temperature (300 degrees C). The biochars produced at different pyrolysis temperatures had different mechanisms of adsorbing metolachlor, which exhibited a transition from hydrogen bonds dominant at low pyrolytic temperature to pore-filling dominant at higher pyrolytic temperature.

分类号： X5`X

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