Comparison of adsorption behavior of Pb(II) by acid–alkali and chitosan modified biochar derived from kiwifruit branch

Human and Ecological Risk Assessment: An International Journal Pub Date : 2022-07-15 DOI:10.1080/10807039.2022.2098467

Ling Jiang, Xiu Yi, Kejian Yang, Mengfan Li, Huihui Rao, Xinxin Wu, Ya-xin Li, Chaoqun Gao

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引用次数: 2

Abstract

Abstract In this work, the kiwifruit branch, a kind of agricultural waste, was reused as a raw material to prepare biochar adsorbent for the removal of Pb(II) from aqueous solution. Then pristine biochar (BC) was further modified to form acid–alkali modified biochar (OBC) and chitosan modified biochar (CBC) to enhance adsorption efficiency toward Pb(II). Characterization experiments with SEM, FTIR and XRD suggested that surface functional groups and crystallization degree of OBC and CBC were all increased in comparison with BC. Batch sorption experiments showed that, compared with BC, the adsorption capacity of Pb(II) by OBC and CBC were improved by 19.57 and 8.37%, respectively. The pseudo-second-order model and the Freundlich model were better for describing the kinetics and isotherms for Pb(II) adsorption onto OBC and CBC, respectively. Accordingly, chemisorption on the heterogeneous adsorption surface played a dominant role in Pb(II) removal.

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酸碱改性和壳聚糖改性猕猴桃枝生物炭对铅(II)的吸附性能比较

摘要以农业废弃物猕猴桃枝为原料，制备生物炭吸附剂，用于去除水中的铅(II)。然后对原始生物炭(BC)进行进一步改性，形成酸碱改性生物炭(OBC)和壳聚糖改性生物炭(CBC)，以提高对Pb(II)的吸附效率。SEM、FTIR和XRD表征实验表明，与BC相比，OBC和CBC的表面官能团和结晶程度均有所提高。批量吸附实验表明，与BC相比，OBC和CBC对Pb(II)的吸附量分别提高了19.57%和8.37%。拟二阶模型和Freundlich模型分别较好地描述了铅(II)在OBC和CBC上的吸附动力学和等温线。因此，非均相吸附表面的化学吸附对Pb(II)的去除起主导作用。

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Human and Ecological Risk Assessment: An International Journal

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