吸附温度对MgAl金属氧化物微观结构和吸附Cr(VI)性能的影响

doi:10.3724/SP.J.1077.2014.13443

无机材料学报 ›› 2014, Vol. 29 ›› Issue (5): 529-533.DOI: 10.3724/SP.J.1077.2014.13443

吸附温度对MgAl金属氧化物微观结构和吸附Cr(VI)性能的影响

徐理华, 曾虹燕, 廖梦尘, 徐圣, 张治青, 李巧

(湘潭大学化工学院, 湘潭 411105)

收稿日期:2013-08-30 修回日期:2013-10-28 出版日期:2014-05-20 网络出版日期:2014-04-24
作者简介:徐理华(1987–), 男, 硕士研究生. E-mail:xulihua_kami@163.com
基金资助:
湖南省自然科学基金重点项目(12JJ2008); 湖南省高校创新平台开放基金(12K048); 2012年湖南省大学生创新性实验计划

Effect of Temperature on Microstructure and Cr(VI) Adsorption Capacity of MgAl Metal Oxides

XU Li-Hua, ZENG Hong-Yan, LIAO Meng-Chen, XU Sheng, ZHANG Zhi-Qing, Li Qiao

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

Received:2013-08-30 Revised:2013-10-28 Published:2014-05-20 Online:2014-04-24
About author:XU Li-Hua. E-mail:xulihua_kami@163.com
Supported by:
Key Project of Hunan Provincial Natural Science Foundation of China (12JJ2008); Open Project of Hunan Provincial University Innovation Platform (12K048); Hunan Province Undergraduate In-novative Experiment Program (2012)

摘要/Abstract

摘要： 研究了MgAl水滑石(LDH)焙烧产物(LDO)对Cr(VI)的吸附性能。考察了吸附温度对LDO吸附性能的影响, 研究了吸附过程的热力学和动力学行为。结合XRD和FT-IR表征, 阐明其吸附机理。结果表明, CrO₄^2–已成功插入水滑石层间, 适当提高吸附温度有利于LDO恢复LDH晶相。在20~60℃范围内, 随吸附温度升高, LDO对Cr(VI)吸附量增大, 50~60℃时, Cr(VI)吸附量为91 mg/g。Cr(VI)的吸附平衡数据符合Langmuir模型方程, ΔG_o为负值说明吸附过程为自发过程, ΔS_o和ΔH_o为正值表明吸附为熵增的吸热过程。吸附动力学符合伪二级动力学模型, LDO 的吸附活化能为20.04 kJ/mol, 表现为扩散控制的活性化学吸附过程。

关键词: 镁铝金属氧化物, 吸附, 铬(VI)

Abstract: The adsorption properties of Cr(VI) on the double oxides (LDO) from calcined MgAl hydrotalcites (LDH) were investigated. The effect of temperature on the adsorption performances of the LDO was studied, and the adsorption kinetics and thermodynamics were studied at different adsorption temperatures. The samples were characterized by XRD and FT-IR to clarify the adsorption mechanism．The results indicated that CrO₄^2– had intercalated into the interlayer structures of Mg-Al hydrotalcites. Moderately increasing temperature was beneficial for the reconstruction of LDH crystalline structure from LDO. In the temperature range of 20℃–60℃, adsorption capacity of the LDO was increased with temperature rising, it reached 91 mg/g in the temperature range from 50℃ to 60℃. The experimental data were well fit to the Langmuir equation. The negative values of ΔG_o indicated that the adsorption process was spontaneous, and positive values of ΔH_o and ΔS_o showed the endothermic and entropy-increasing nature of the process. The adsorption was consistent with the pseudo-second order kinetic model. The active energy value was 20.04 kJ/mol, which implying that the internal diffusion was the rate-determining step in the chemical adsorption.

Key words: MgAl metal oxides, adsorption, chromium(VI)

中图分类号:

TB321

徐理华, 曾虹燕, 廖梦尘, 徐圣, 张治青, 李巧. 吸附温度对MgAl金属氧化物微观结构和吸附Cr(VI)性能的影响[J]. 无机材料学报, 2014, 29(5): 529-533.

XU Li-Hua, ZENG Hong-Yan, LIAO Meng-Chen, XU Sheng, ZHANG Zhi-Qing, Li Qiao . Effect of Temperature on Microstructure and Cr(VI) Adsorption Capacity of MgAl Metal Oxides[J]. Journal of Inorganic Materials, 2014, 29(5): 529-533.

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吸附温度对MgAl金属氧化物微观结构和吸附Cr(VI)性能的影响

Effect of Temperature on Microstructure and Cr(VI) Adsorption Capacity of MgAl Metal Oxides

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