无机材料学报2011，Vol.26Issue(8)：874-880,7.DOI:10.3724/SP.J.1077.2011.00874
Mg-Al水滑石“记忆效应”及其对Cr(VI)阴离子吸附性能研究
"Memory Effect" of Mg-Al Hydrotalcites and Its Chromium(VI) Adsorption Property
摘要
Abstract
Mg-Al hydrotalcite (MAH) with high crystallinity was prepared using urea method. The "memory effect" and the chromium(Ⅵ) adsorption property of Mg-Al Hydrotalcites were studied. The MAH, reconstructed MAH (RMAH), calcined MAH (MAO) and calcined RMAH (RMAO) were characterized by XRD, FT-IR, SEM and DSC as well as self-deconvolution analyses. The results showed that the MAH and RMAH possessed a layered structure of hydrotalcites with high crystallinity, and there was little difference in crystal structures and charge density of brucite-like sheets between MAH and RMAH. The brucite-like sheets were still held in MAO, and a little remained in RMAO with more MgAl2O4. The adsorbility of Mg-Al LDOs(MAO and RMAO) to Cr(VI) anions was substantially higher than that of Mg-Al LDHs(MAH and RMAH), mainly because of the structure "memory effect" of hydrotalcites. The adsorbility of the MAO was higher than that of the RMAO. The adsorbility decrease of the RMAO might be due to the increase of the content of spinel MgAl2O4 phase and the decline of brucite-like sheets in RMAO that resulted in the descent of the "memory effect" reconstruction property. This newly discovery for anionic clays is useful for the decontamination of waste waters. The Mg-Al hydrotalcite can be considered as a potential material for sorption of anions in wastewater treatment systems.关键词
Mg-Al水滑石/记忆效应/铬(VD/吸附/衰减Key words
Mg-Al hydrotalcite/memory effect/Cr(Ⅵ)/adsorption/descent分类
通用工业技术引用本文复制引用
赵策,曾虹燕,王亚举,刘平乐,李玉芹,杨永杰..Mg-Al水滑石“记忆效应”及其对Cr(VI)阴离子吸附性能研究[J].无机材料学报,2011,26(8):874-880,7.基金项目
国家重大科技专项(2009ZX07212-001-03) （2009ZX07212-001-03）
国家自然科学基金(20976148) （20976148）
湖南省研究生科研创新项目(CXZ010B268) （CXZ010B268）
