期刊
JOURNAL OF HAZARDOUS MATERIALS
卷 194, 期 -, 页码 312-323出版社
ELSEVIER
DOI: 10.1016/j.jhazmat.2011.07.104
关键词
Passive treatment; Hydroxyapatite; Phosphate; Heavy metal; Immobilisation
资金
- Spanish Government [CTQ2008-06842-C02-01/PPQ, CTM-2007-66724-CO2/TECNO, CGL2010-21956-CO2-01]
- Catalan Government [20095GR905]
Apatite II (TM), a biogenic hydroxyapatite, was evaluated as a reactive material for heavy metal (Cd, Cu, Co, Ni and Hg) removal in passive treatments. Apatite II (TM) reacts with acid water by releasing phosphates that increase the pH up to 6.5-7.5, complexing and inducing metals to precipitate as metal phosphates. The evolution of the solution concentration of calcium, phosphate and metals together with SEM-EDS and XRD examinations were used to identify the retention mechanisms. SEM observation shows low-crystalline precipitate layers composed of P, O and M. Only in the case of Hg and Co were small amounts of crystalline phases detected. Solubility data values were used to predict the measured column experiment values and to support the removal process based on the dissolution of hydroxyapatite, the formation of metal-phosphate species in solution and the precipitation of metal phosphate. Cds(PO4)(3)OH(s), Cu-2(PO4)OH(s), Ni-3(PO4)(2)(s), Co-3(PO4)(2)8H(2)O(s) and Hg-3(PO4)(2)(s) are proposed as the possible mineral phases responsible for the removal processes. The results of the column experiments show that Apatite II (TM) is a suitable filling for permeable reactive barriers. (C) 2011 Elsevier BM. All rights reserved.
作者
我是这篇论文的作者
点击您的名字以认领此论文并将其添加到您的个人资料中。
推荐
暂无数据