The Effects of Three Bean Shell Biochars Under Different Pyrolysis Temperatures on the Adsorption of Cd and Pb in Aqueous Solutions

文献类型： 外文期刊

第一作者： Shen, Tao

作者： Shen, Tao;Xia, Hongyu;Zhang, Heyi;Guang, Song;Hu, Wenwen;Zhao, Wenrui;Zhao, Kuan;Xiao, Xin;Zhang, Shiwen;Xu, Aiai

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关键词： bean shell biochar; representation; heavy metals; adsorption

期刊名称：WATER （ 影响因子：3.0； 五年影响因子：3.3 ）

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年卷期： 2025 年 17 卷 7 期

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收录情况： SCI

摘要： Biochar is an eco-friendly material that influences heavy metals adsorption. Three kinds of bean shell biochar, namely, peanut, pea, and soybean biochar, were prepared at pyrolysis temperatures of 400 degrees C, 500 degrees C, and 600 degrees C. The characteristics of these biochars and the physicochemical properties of the biochars were analyzed. The capacities of the different biochars to adsorb Pb and Cd from aqueous solution were determined. With increasing pyrolysis temperature, the relative content of carbon in the biochar increased and that of hydrogen decreased, the porosity decreased, and the specific surface area increased; accordingly, the adsorption capacity of the biochar for Pb and Cd increased. The Pb adsorption capacity of the peanut shell biochar prepared at 400 degrees C was lower than that of the other shell biochars when the initial Pb concentration was at a low concentration. Three adsorption isotherm models were used to fit the adsorption processes of Pb or Cd on the three different biochars. The Freundlich curves better fit the adsorption capacity of biochar for Cd, and the Freundlich and Langmuir curves better fit the adsorption capacity of biochar for Pb. This work provides a scientific basis for the rational selection of bean shell biochar used in metal-contaminated water.

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