Journal
CHEMOSPHERE
Volume 190, Issue -, Pages 260-266Publisher
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.chemosphere.2017.09.140
Keywords
Bioapatite; Biochar; Lead; Immobilization; Pyromorphite
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Funding
- Natural Science Foundation of Jiangsu Province of China [BK20150683]
- Fundamental Research Funds for the Central Universities [KYZ201712]
- China Postdoctoral Science Foundation [2017M610330]
- Top-notch Academic Programs Project of Jiangsu Higher Education Institutions
- Killam Trusts from Canada
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Bioapatite (BAp) is regarded as an effective material to immobilize lead (Pb2+) 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 Pb2+. 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 Pb2+. 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 Pb2+ from the aqueous solution containing 1000 ppm Pb2+. 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 Pb2+ 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 Pb2+ in contaminated soil. (C) 2017 Elsevier Ltd. All rights reserved.
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