期刊
JOURNAL OF HAZARDOUS MATERIALS
卷 154, 期 1-3, 页码 623-632出版社
ELSEVIER
DOI: 10.1016/j.jhazmat.2007.10.101
关键词
leaching; lead; plant biomass; Salvinia; phytoremediation; oxalates
Plant biomass harvested after heavy-metal phytoremediation must be considered as a hazardous waste that should be contained or treated appropriately before disposal or reuse. As a potential method to detoxify the biomass and to convert this material to a suitable fertilizer or mulch, leaching of lead (Ph) from Salvinia minima biomass was studied by testing water, several aqueous ammonium salts, and EDTA solution as lead extractants. The research was carried out in two phases: (i) a leaching study to determine the lead-extraction efficiency of the different leachants, and (ii) a thermodynamic analysis to identify the likely reactions and stable Pb(II) species formed in the leaching systems of the most efficient leachants. Experimentally, lead concentrations measured in leached biomass and in leachates were significantly different among the various leachants. It was determined that the extraction strength of the leachants followed the order: EDTA > ammonium oxalate > water similar to ammonium nitrate > ammonium acetate, achieving Pb extraction efficiencies of 99%, 70%, 7.2%, 6.9% and 1.3%, respectively, in single-stage extractions. The thennodynamic study indicated that the dominant species produced by the leaching process should be the soluble species PbEDTA(2-) for EDTA system, and the insoluble Pb(COO)(2S) precipitate for the oxalate system. (c) 2007 Elsevier B.V. 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