Mg-Al水滑石“记忆效应”及其对Cr(VI)阴离子吸附性能研究

doi:10.3724/SP.J.1077.2011.00874

无机材料学报 ›› 2011, Vol. 26 ›› Issue (8): 874-880.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

赵策, 曾虹燕, 王亚举, 刘平乐, 李玉芹, 杨永杰

(湘潭大学化工学院, 湘潭 411105)

收稿日期:2010-10-10 修回日期:2010-11-24 出版日期:2011-08-20 网络出版日期:2011-07-14
作者简介:赵策(1986-), 男, 硕士研究生. E-mail: cezhao1986@163.com
基金资助:
国家重大科技专项(2009ZX07212-001-03); 国家自然科学基金(20976148); 湖南省研究生科研创新项目(CXZ010B268)

“Memory Effect” of Mg-Al Hydrotalcites and Its Chromium(VI) Adsorption Property

ZHAO Ce, ZENG Hong-Yan, WANG Ya-Ju, LIU Ping-Le, LI Yu-Qin, YANG Yong-Jie

(School of Chemical Engineering, Xiangtan University, Xiangtan 411105, China)

Received:2010-10-10 Revised:2010-11-24 Published:2011-08-20 Online:2011-07-14
Supported by:
Important Natural Science & Technology Specific Projects(2009ZX07212-001-03); National Natural Science Foundation of China NOS (20976148); Program for postgraduate Research Innovation of Hunan Province of China (CXZ010B268)

摘要/Abstract

摘要： 采用尿素法制备高结晶度Mg-Al 水滑石(MAH), 系统研究了Mg-Al水滑石“记忆效应”及其对Cr(VI) 阴离子吸附性能的影响. 通过XRD、FT-IR、SEM、DSC以及去卷积分析对MAH、重构“记忆”MAH (RMAH)以及MAH的金属氧化物(MAO)、RMAH的金属氧化物(RMAO)进行表征分析. 结果表明, 重构的“记忆”RMAH和前体MAH均具高结晶度水滑石层状晶体结构特征, 两者晶体结构和层板电荷密度几乎无差异. MAO仍保留层状结构, 而再次重构的RMAO中MgAl₂O₄尖晶石晶相增多, 仍有层状结构残留. 由于水滑石强结构“记忆效应”, 使Mg-A1 LDOs(MAO和RMAO)对Cr(VI)阴离子吸附能力大大强于Mg-A1 LDHs(MAH和RMAH). MAO对Cr(VI)阴离子吸附能力高于RMAO, 可能由于RMAH焙烧形成的RMAO中MgAl₂O₄尖晶石含量增多及层状结构消减, 导致其“记忆效应”重构能力衰减, 从而使RMAO对Cr(VI)阴离子吸附能力下降.

关键词: Mg-Al水滑石, 记忆效应, 铬(VI), 吸附, 衰减

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-A1 LDOs(MAO and RMAO) to Cr(VI) anions was substantially higher than that of Mg-A1 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.

Key words: Mg-Al hydrotalcite, memory effect, Cr(VI), adsorption, descent

中图分类号:

TB321

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.

ZHAO Ce, ZENG Hong-Yan, WANG Ya-Ju, LIU Ping-Le, LI Yu-Qin, YANG Yong-Jie. “Memory Effect” of Mg-Al Hydrotalcites and Its Chromium(VI) Adsorption Property[J]. Journal of Inorganic Materials, 2011, 26(8): 874-880.

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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

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