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The ratio of H/C is a useful parameter to predict adsorption of the herbicide metolachlor to biochars

文献类型： 外文期刊

作者： Wei, Lan 1 ; Huang, Yufen 1 ; Huang, Lianxi 1 ; Li, Yanliang 1 ; Huang, Qing 1 ; Xu, Guizhi 1 ; Muller, Karin 4 ; Wang, H 1 ;

作者机构： 1.Guangdong Acad Agr Sci, Inst Agr Resources & Environm, Key Lab Plant Nutr & Fertilizer South Reg, Minist Agr, Guangzhou 510640, Peoples R China

2.Guangdong Acad Agr Sci, Inst Agr Resources & Environm, Guangdong Key Lab Nutrient Cycling & Farmland Con, Guangzhou 510640, Peoples R China

3.GDEST, Guangdong Key Lab Integrated Agroenvironm Pollut, Guangzhou 510650, Peoples R China

4.New Zealand Inst Plant & Food Res Ltd, Ruakura Res Ctr, Private Bag 3123, Hamilton, New Zealand

5.Foshan Univ, Sch Environm & Chem Engn, Foshan 528000, Guangdong, Peoples R China

6.Zhejiang A&F Univ, Key Lab Soil Contaminat Bioremediat Zhejiang Prov, Hangzhou 311300, Zhejiang, Peoples R China

7.Korea Univ, Korea Biochar Res Ctr, Seoul, South Korea

8.Korea Univ, Div Environm Sci & Ecol Engn, Seoul, South Korea

关键词： Chinese medicinal herb residue; Adsorption mechanism; Functional groups; Pore-filling; H/C ratio

期刊名称：ENVIRONMENTAL RESEARCH （ 影响因子：6.498； 五年影响因子：6.824 ）

ISSN： 0013-9351

年卷期： 2020 年 184 卷

页码：

收录情况： SCI

摘要： Biochar adsorbent was produced by pyrolyzing traditional Chinese medicinal herb residue at 300, 500 and 750 degrees C (referred to as biochar-300, biochar-500 and biochar-750). Basic physical and chemical analyses, Fourier transform infrared spectroscopy (FT-IR), and thermodynamic analyses were performed to elucidate adsorption and properties of biochar. Biochar adsorption capacity of herbicide metolochlor, as measured by batch-type adsorption experiments by Freundlich constant K-f (mg(1-n) L-n kg(-1)), followed the order: biochar-750 > biochar300 > biochar-500. Thermodynamic analysis suggested that adsorption of metolachlor on biochar was a spontaneous process. The adsorption isotherm for the biochar produced at the highest pyrolysis temperature was characteristic for adsorption process driven by a high surface area of biochar (85.30 m(2) g(-1)), while the adsorption process for the biochar produced at the lowest temperature was controlled by its higher content of organic matter (39.06%) and abundant functional groups. The FT-IR spectra also showed that the biochar prepared at the lowest temperature had the highest number of surface groups. In general, pore-filling induced by the large surface area of the biochar was the dominant adsorption mechanism. When the H/C value was > 0.5, the adsorption mechanism of biochar was dominated by surface chemical bond, while pore-filling played a major role when the H/C value was < 0.5.

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