Enhancing sorption of layered double hydroxide-based magnetic biochar for arsenic and cadmium through optimized preparation protocols

文献类型： 外文期刊

第一作者： Lyu, Peng

作者： Lyu, Peng;Li, Lianfang;Zhu, Changxiong;Lyu, Peng;Li, Lianfang;Huang, Jinli;Ye, Jing;Zhu, Changxiong;Xie, Jinni;Wang, Zihan;Kang, Mengqi;Yan, Ao

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关键词： Modified biochar; Sorption; Preparation protocols; Performance-characterization relationship; As(III) and Cd(II)

期刊名称：BIORESOURCE TECHNOLOGY （ 影响因子：11.4； 五年影响因子：10.6 ）

ISSN： 0960-8524

年卷期： 2023 年 388 卷

页码：

收录情况： SCI

摘要： The impact of multiple preparation protocols on properties and performance of modified biochar remains unclear. This study prepared layered double hydroxide (LDH)-based magnetic biochars (LMBCs) with different LDH loading rates (LLR), pyrolysis temperatures, and biomass sources to explore their performance-characterization relationships toward As(III) and Cd(II). Higher LLR and pyrolysis temperature enhanced LMBCs' adsorption capacities by increasing specific surface area (SSA) and metal/O-containing groups. Hence, LMBC produced at 2:1 LLR (LDH: magnetic biochar) and 800 degrees C pyrolysis exhibited maximum adsorption over 2 times that of LMBC with 0.5:1 LLR and 400 degrees C pyrolysis. Bamboo-sourced LMBC demonstrated superior adsorption than sewage sludge and garlic-sourced LMBCs due to its increased SSA, enabling a higher loading of nano-LDH. Adsorption of As(III) and Cd(II) onto LMBCs was governed by metal-mineral and metal-containing group through coprecipitation and complexation. This study provides a reference for adjusting the preparation protocols to improve sorption performance of modified biochar toward multiple heavy metals.

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