1. Mechanisms of biochar assisted immobilization of Pb2+ by bioapatite in aqueous solution.
- Author
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Shen, Zhengtao, Tian, Da, Zhang, Xinyu, Tang, Lingyi, Su, Mu, Zhang, Li, Li, Zhen, Hu, Shuijin, and Hou, Deyi
- Subjects
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LEAD , *BIOCHAR , *WHEAT straw , *ADSORPTION capacity , *SOIL pollution - Abstract
Bioapatite (BAp) is regarded as an effective material to immobilize lead (Pb 2+ ) via the formation of stable pyromorphite. However, when applied in contaminated soil, due to its low surface area and low adsorption capacity, BAp might not sufficiently contact and react with Pb 2+ . Biochar, a carbon storage material, typically has high surface area and high adsorption capacity. This study investigated the feasibility of using biochar as a reaction platform to enhance BAp immobilization of Pb 2+ . An alkaline biochar produced from wheat straw pellets (WSP) and a slightly acidic biochar produced from hardwood (SB) were selected. The results of aqueous adsorption showed the combination of biochar (WSP or SB) and BAp effectively removed Pb 2+ from the aqueous solution containing 1000 ppm Pb 2+ . XRD, ATR-IR, and SEM/EDX results revealed the formation of hydroxypyromorphite on both biochars’ surfaces. This study demonstrates that biochars could act as an efficient reaction platform for BAp and Pb 2+ in aqueous solution due to their high surface area, porous structure, and high adsorption capacity. Therefore, it is mechanistically feasible to apply biochar to enhance BAp immobilization of Pb 2+ in contaminated soil. [ABSTRACT FROM AUTHOR]
- Published
- 2018
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