Efficient removal of Cr(Ⅵ) by thermal-modified layered double hydroxides (LDHs): adsorption behaviors, effect parameters and comparison with original LDHs

ZHANG Yingxin; ZHOU Tao; MAO Juan; WU Xiaohui; YUAN Zhen

doi:10.11949/j.issn.0438-1157.20150134

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Efficient removal of Cr(Ⅵ) by thermal-modified layered double hydroxides (LDHs): adsorption behaviors, effect parameters and comparison with original LDHs

更新时间：2025-12-10

- Efficient removal of Cr(Ⅵ) by thermal-modified layered double hydroxides (LDHs): adsorption behaviors, effect parameters and comparison with original LDHs
- CIESC Journal Issue S1, Pages: 228-236(2015)
- 作者机构：
  
  华中科技大学环境科学与工程学院,湖北,武汉,430074
- 作者简介：
- 基金信息：
- DOI：10.11949/j.issn.0438-1157.20150134
  CLC： 52
- Online First：30 June 2015，
  
  Published：30 June 2015
- 稿件说明：
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ZHANG Yingxin, ZHOU Tao, MAO Juan, et al. Efficient removal of Cr(Ⅵ) by thermal-modified layered double hydroxides (LDHs): adsorption behaviors, effect parameters and comparison with original LDHs[J]. CIESC Journal, 2015, (S1): 228-236.
DOI：

ZHANG Yingxin, ZHOU Tao, MAO Juan, et al. Efficient removal of Cr(Ⅵ) by thermal-modified layered double hydroxides (LDHs): adsorption behaviors, effect parameters and comparison with original LDHs[J]. CIESC Journal, 2015, (S1): 228-236. DOI： 10.11949/j.issn.0438-1157.20150134.

摘要

通过共沉淀法制备得到镁铝层状双氢氧化物(LDHs)

并在450℃高温下进行热改性处理(即C-LDHs)。系统性比较了上述两种材料除Cr(Ⅵ)的吸附动力学及等温线模型

并考察温度、pH、Cr(Ⅵ)初始浓度等重要因素对吸附效果的影响。使用XRD、SEM、FT-IR和TG-DTG等对两种吸附材料进行了表面特性表征。结果表明

热改性后C-LDHs的表面性质发生了巨大变化。但其吸附过程仍符合Langmuir吸附等温式。C-LDHs对Cr(Ⅵ)的最大吸附量为105.26 mg·g-1

远大于LDHs的吸附量(20.66 mg·g-1)。本文结果表明

对层状双氢氧化物进行经济方便的热改性可大幅度增强其对Cr(Ⅵ)的吸附性能

对层状双氢氧化物的工业化应用具有重要的参考价值。

Abstract

The pollution of hexavalent chromium (Cr(Ⅵ)) is of particular environmental concern because of its toxicity and carcinogenic effect. In this study

Mg-Al layered double hydroxides (Mg-Al LDHs) were prepared by the co-precipitation method. It was found that a thermal modification process of the Mg-Al LDHs (calcined LDHs

C-LDHs) could improve obviously the adsorption capacity of Cr(Ⅵ). The equilibrium isotherms showed that the adsorption of Cr(Ⅵ) using either LDHs or C-LDHs could be well fitted with the Langmuir model. The maximum Cr(Ⅵ) uptake capacity of C-LDHs and original LDHs was 105.26 and 20.66 mg·g-1 at 30℃

respectively. The pseudo-second-order model could be used to describe the adsorption of Cr(Ⅵ) on both C-LDHs and LDHs. Effect of important parameters such as reaction temperature

pH and initial Cr(Ⅵ) concentration was also investigated

and it was found that the reaction temperature has slight effect on the adsorption capacity of the C-LDHs. This could be ascribed to the nature of the Cr(Ⅵ) adsorption reaction by the C-LDHs. Characterizations of the LDHs and C-LDHs by XRD

SEM

FT-IR and TG-DTG evidenced that the surface properties of LDHs particles could be successfully varied by the calcined treatment of LDHs.

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