反应时间对镁铝水滑石制备及其吸附性能的影响

硅酸盐通报 ›› 2021, Vol. 40 ›› Issue (3): 1022-1028.

反应时间对镁铝水滑石制备及其吸附性能的影响

胡盛, 张明浩, 胡卫兵

湖北民族大学化学与环境工程学院,生物资源保护与利用湖北省重点实验室,恩施 445000

收稿日期:2020-09-08 修回日期:2020-11-30 出版日期:2021-03-15 发布日期:2021-04-13
作者简介:胡盛(1983—),男,博士,副教授。主要从事硅酸盐矿物复合材料方面的研究。E-mail:cailiaoxue007@126.com
基金资助:
国家自然科学基金(31460172);湖北民族大学高水平科研成果校内培育项目(PY20014);恩施州科技项目(D20180027);生物资源保护与利用湖北省重点实验室开放基金(PT012022)

Effect of Reaction Time on Preparation and Adsorption Properties of Mg-Al Hydrotalcite

HU Sheng, ZHANG Minghao, HU Weibing

Key Laboratory of Biologic Resources Protection and Utilization of Hubei Province, School of Chemical and Environment Engineering, Hubei Minzu University, Enshi 445000, China

Received:2020-09-08 Revised:2020-11-30 Online:2021-03-15 Published:2021-04-13

摘要/Abstract

摘要： 采用共沉淀法制备镁铝水滑石,并利用XRD、SEM、FT-IR对反应产物进行表征,研究了反应时间对水滑石物相组成、微观结构和对盐酸四环素吸附性能的影响,对土壤污染治理和修复具有重要的现实意义。结果分析表明,当反应时间为12 h时制备的镁铝水滑石对盐酸四环素有较好的吸附效果,吸附率为70.82%。镁铝水滑石对盐酸四环素的吸附过程符合准一级动力学方程,以静电吸附为主;对盐酸四环素的吸附行为符合Langmuir等温式,其中,ΔH^O为7.40 kJ/mol,ΔG^O＜0,ΔS^O为40.82 J/(mol·K),表明在研究的温度范围内该吸附是吸热、自发、熵增过程。

关键词: 镁铝水滑石, 反应时间, 吸附性能, 盐酸四环素, 吸附动力学, 吸附热力学

Abstract: Tetracycline hydrochloride is not completely absorbed in the organism and is discharged from the body, which is toxic to the soil and threatening the ecological environment. Tetracycline hydrochloride residue in the soil environment is not easy to be biodegraded because of its structure containing naphthol ring. Adsorption method has excellent characteristics like simple, economical, efficient and cheap, which is an effective way to treat tetracycline hydrochloride wastewater. Magnesium-aluminum hydrotalcite was prepared by uniform co-precipitation method. The products were characterized by X-ray diffraction (XRD), fourier transform infrared spectra (FT-IR) and scanning electron microscope (SEM). The effects of the different time on the microstructure of Mg-Al hydrotalcite were studied. The effects of reaction conditions on the adsorption properties of Mg-Al hydrotalcite were investigated by using tetracycline hydrochloride as adsorbent. It has important practical significance for soil pollution control and remediation. The results show that when the reaction time is 12 h, the maximum adsorption rate of tetracycline hydrochloride on Mg-Al hydrotalcite is 70.82%. The adsorption behavior of Mg-Al hydrotalcite for tetracycline hydrochloride is in accordance with Langmuir isothermal equation and quasi first-order kinetic model. The results show that the thermodynamic parameter of ΔH^O is 7.40 kJ/mol, and ΔG^O is less than 0, ΔS^O is 40.82 J/(mol·K), respectively, indicate that the adsorption process is endothermic, spontaneous and entropy increasing process in this study temperature range.

Key words: Mg-Al hydrotalcite, reaction time, adsorption property, tetracycline hydrochloride, sorption kinetics, adsorption thermodynamics

中图分类号:

TB34

胡盛, 张明浩, 胡卫兵. 反应时间对镁铝水滑石制备及其吸附性能的影响[J]. 硅酸盐通报, 2021, 40(3): 1022-1028.

HU Sheng, ZHANG Minghao, HU Weibing. Effect of Reaction Time on Preparation and Adsorption Properties of Mg-Al Hydrotalcite[J]. BULLETIN OF THE CHINESE CERAMIC SOCIETY, 2021, 40(3): 1022-1028.

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