Effects of fly ash modification on phosphorus adsorption of sludge-based biochar from aqueous solution

文献类型： 外文期刊

第一作者： Zuo, Yanxin

作者： Zuo, Yanxin;Wan, Liguo;Zuo, Yanxin;Tian, Shuangchao;Xiao, Benyi;Li, Lin;Tian, Tian

作者机构：

关键词： Fly ash; Modification; Phosphorus adsorption; Sewage sludge; Sludge-based biochar

期刊名称：JOURNAL OF MATERIAL CYCLES AND WASTE MANAGEMENT （ 影响因子：3.0； 五年影响因子：3.2 ）

ISSN： 1438-4957

年卷期： 2024 年 26 卷 6 期

页码：

收录情况： SCI

摘要： Fly ash (FA) was used to modify sludge-based biochar (SBC) to improve its phosphorus (P) adsorption capacity, which was conducted by adding FA in the dried sewage sludge before 600 degrees C pyrolysis. FA modification increased the surface area of SBC, decreased its average pore diameter, increased its Al and Fe contents, improved its crystallinity, and enhanced its maximal P adsorption capacity from 12.37 mg adsorbed P/g SBC (mg/g) to 14.05 mg/g. The P adsorption process was well fitted by the pseudo-second-order kinetic and Langmuir isotherm models, indicating that P adsorption onto SBC was a single molecular layer adsorption dominated by chemical adsorption. The P adsorption onto SBCs was spontaneous and endothermic. FA modification improved the reusability of SBC by increasing the retention rate from 74.9 +/- 5.8% to 80.8 +/- 5.4% after four adsorption and desorption cycles. FA modification changed the P adsorption mechanism of SBC from ligand exchange, electrostatic attraction, and ion exchange to surface inner-sphere complex formation, electrostatic attraction, and ion exchange.

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