Effect of Rape-Straw-Derived Biochar on the Adsorption Properties of Single and Complex Trace Elements
Effect of Rape-Straw-Derived Biochar on the Adsorption Properties of Single and Complex Trace Elements
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DOI：
10.3390/w15132471
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发表时间：
2023-07
期刊：
影响因子：
3.4
通讯作者：
Shuai Ma;Xinghua Huang;Liang Shen;C. Lv;Weiqin Yin;Donghao Liu;Hongjun Wu;Shengsen Wang;Qiao Xu;Xiaozhi Wang
中科院分区：
文献类型：
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作者：
Shuai Ma;Xinghua Huang;Liang Shen;C. Lv;Weiqin Yin;Donghao Liu;Hongjun Wu;Shengsen Wang;Qiao Xu;Xiaozhi Wang
以油菜秸秆为原料，在500 °C氧限制条件下制备共热解生物炭（RSBC），研究其对污染溶液中单一和复合微量元素（Fe 2+、Mn 2+、Cu 2+和Zn 2+）的吸附性能。通过扫描电子显微镜（SEM）、傅里叶变换红外光谱（FTIR）和批量吸附实验分别测定了RSBC的微观结构、官能团和吸附行为。单一/复合吸附结果表明，RSBC对Fe ~（2+）、Mn ~（2+）、Cu ~（2+）和Zn ~（2+）的吸附容量分别为32.21/23.78、8.95/3.41、28.12/7.19和13.77/4.92 mg/g。在混合吸附体系中，Langmuir等温吸附模型较Freundlich模型更适合，而在单一吸附体系中，准二级动力学模型最适合。热力学吸附分析表明，RSBC对4种离子的去除率分别为22.14%、8.95%、18.75%和13.77%。此外，由于芳香结构和极性基团的结合作用，吸附机理主要是化学吸附，包括离子交换、沉淀和络合。此外，多孔结构和高灰分含量的生物炭也为吸附这些离子提供了有利条件。通过这个简单的过程，这项工作提供了一个潜在的策略，以生产具有高吸附能力的生物炭修复污染溶液中的微量元素。
Copyrolysis biochar derived from rape straw (RSBC) was prepared through oxygen-limited pyrolysis at 500 °C and utilized to investigate its adsorption capability for single and complex trace elements (Fe2+, Mn2+, Cu2+, and Zn2+) in contaminated solutions. The microstructures, functional groups, and adsorption behaviors of RSBC were determined through scanning electron microscopy (SEM), Fourier transform infrared spectroscopy (FTIR), and batch adsorption experiments, respectively. From these, the single/complex adsorption results showed that the adsorption capacity of RSBC for Fe2+, Mn2+, Cu2+, and Zn2+ was 32.21/23.78, 8.95/3.41, 28.12/7.19, and 13.77/4.92 mg/g, respectively. The Langmuir isotherm model fit better than that of Freundlich in the mixed adsorption system, while the pseudo-second-order kinetic model was the most suitable for single adsorption. Thermodynamic adsorption analysis revealed that the removal rate of the four ions by RSBC was 22.14%, 8.95%, 18.75%, and 13.77%, respectively. Moreover, the adsorption mechanism was primarily chemical adsorption, including ion exchange, precipitation, and complexation, because of the binding effects of aromatic structures and polar groups. Additionally, biochar, with its porous structure and high ash content also provided favorable conditions for adsorption of those ions. Through this simple procedure, this work provides a potential strategy to produce biochar with a high adsorption capacity to remediate trace elements in contaminated solutions.