High adsorption capacity of Mg-Al-modified biochar for phosphate and its potential for phosphate interception in soil

文献类型： 外文期刊

第一作者： Zheng, Qin

作者： Zheng, Qin;Song, Dali;Zhang, Shuai;Wu, Hang;Li, Shutian;Wang, Xiubin;Zheng, Qin;Yang, Lanfang

作者机构：

关键词： Mg/al; Modified biochar; Phosphate; Adsorption; Interception

期刊名称：CHEMOSPHERE （ 影响因子：7.086； 五年影响因子：6.956 ）

ISSN： 0045-6535

年卷期： 2020 年 259 卷

页码：

收录情况： SCI

摘要： In this study, Mg and/or Al modified biochars (MABC(1), MBC2, ABC(3)) prepared by co-precipitation were to explore their phosphate adsorption capacity from aqueous solution and the potential for soil phosphate interception. The results revealed that MABC composites contained more functional groups than MBC and showed a higher surface area than ABC. The surface of MABC contained dispersed MgAl2O4, Mg(OH)(2), AlOOH and Al2O3 crystals that were associated with its enhanced maximum phosphate adsorption capacity (153.40 mg g(-1)). According to Langmuir model, the maximum adsorption capacity of MABC was 15.91, 1.85, and 93.54 times the capacity of MBC, ABC, and raw biochar (BC4), respectively. The addition of MABC in red soil could significantly slow down the release of soil phosphorus, and MABC also had a stronger phosphate interception capacity (59.89%) than other BCs. In summary, MABC exhibits superior phosphate adsorption and interception capacity, making it ideal for treatment and prevention of phosphorus-polluted water. (C) 2020 Elsevier Ltd. All rights reserved.

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