CUED Publications database

Mechanisms of biochar assisted immobilization of Pb<sup>2+</sup> by bioapatite in aqueous solution

Shen, Z and Tian, D and Zhang, X and Tang, L and Su, M and Zhang, L and Li, Z and Hu, S and Hou, D (2018) Mechanisms of biochar assisted immobilization of Pb<sup>2+</sup> by bioapatite in aqueous solution. Chemosphere, 190. pp. 260-266. ISSN 0045-6535

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Abstract

© 2017 Elsevier Ltd 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.

Item Type: Article
Uncontrolled Keywords: Bioapatite Biochar Immobilization Lead Pyromorphite Adsorption Carbon Charcoal Environmental Restoration and Remediation Lead Minerals Phosphates Soil Pollutants Triticum Water
Subjects: UNSPECIFIED
Divisions: Div D > Geotechnical and Environmental
Depositing User: Cron Job
Date Deposited: 14 Oct 2017 20:06
Last Modified: 27 Oct 2020 05:36
DOI: 10.1016/j.chemosphere.2017.09.140