二氧化铈/钙铝水滑石/活性炭的制备及环境应用

doi:10.16085/j.issn.1000-6613.2016.01.024

化工进展 ›› 2016, Vol. 35 ›› Issue (01): 182-188.DOI: 10.16085/j.issn.1000-6613.2016.01.024

二氧化铈/钙铝水滑石/活性炭的制备及环境应用

谢非, 李静, 晋冠平

合肥工业大学化学与化工学院, 安徽合肥 230009

收稿日期:2015-04-24 修回日期:2015-05-12 出版日期:2016-01-05 发布日期:2016-01-05
通讯作者: 晋冠平,博士,教授,研究方向为环境化学和碳载体复合材料。E-mail:jgp1963611@163.com。
作者简介:谢非(1991-),男,硕士研究生。E-mail:18226620550@163.com。
基金资助:
国家自然科学基金(21076054)及安徽省淮北市新产品开发项目(J2014AHDS0010)。

Preparation of CeO₂/CaAl-LDHs/AC and its environmental applications

XIE Fei, LI Jing, JIN Guanping

School of Chemistry and Chemical Engineering, Hefei University of Technology, Hefei 230009, Anhui, China

Received:2015-04-24 Revised:2015-05-12 Online:2016-01-05 Published:2016-01-05

摘要/Abstract

摘要： 采用超声辅助共沉淀法,制备了二氧化铈/钙铝水滑石/活性炭复合材料(CeO₂/CaAl-LDHs/AC)。通过场发射扫描电子显微镜、X射线衍射、X射线光电子能谱、傅里叶变换红外光谱和热重分析技术,对CeO₂/CaAl-LDHs/AC的形貌、组成和结构进行了表征。结果发现:花样片层状的CeO₂/CaAl-LDHs材料均匀地分布在活性炭上。考察了CeO₂/CaAl-LDHs/AC对水溶液中铬(Ⅵ)、铅(Ⅱ)、氟和孔雀绿的吸附性能。此类污染物的吸附过程均符合准二阶动力学模型和Langmuir等温模型;在pH=7、45℃和吸附时间2h条件下,CeO₂/CaAl-LDHs/AC可成功用于铬(Ⅵ)、铅(Ⅱ)、氟和孔雀绿的吸附去除,最大吸附量分别为83.06mg/g、131.58mg/g、61.20mg/g和420.17mg/g。

关键词: 水滑石, 活性炭, 二氧化铈, 吸附, 动力学, 热力学

Abstract: Ce-doped CaAl/layered double hydroxide was coated at activated carbon(CeO₂/CaAl-LDHs/AC) by co-precipitation method with the aid of ultrasound. The products was characterized by field emission scanning electron microscopy, X-ray diffraction, X-ray photoelectron spectroscopy, Fourier transform infrared spectroscopy and thermogravimetric analysis. Flower-like layer structure CeO₂/CaAl-LDHs was well distributed on the surface of active carbon with good thermostability. The adsorption of Cr(Ⅵ), Pb(Ⅱ), fluoride and malachite green by CeO₂/CaAl-LDHs/AC were investigated respectively in aqueous solution. All the adsorption processes agree with the pseudo-second-order kinetic model and the Langmuir isotherm model. The maximum adsorption capacity of Cr(Ⅵ), Pb(II), fluoride and malachite green are 83.06mg/g, 131.58mg/g, 61.20mg/g and 420.17mg/g at pH=7.0, 45℃ and 2h, respectively.

Key words: layered double hydroxides (LDHs), activated carbon, ceria, adsorption, kinetics, thermodynamics

中图分类号:

X523

谢非, 李静, 晋冠平. 二氧化铈/钙铝水滑石/活性炭的制备及环境应用[J]. 化工进展, 2016, 35(01): 182-188.

XIE Fei, LI Jing, JIN Guanping. Preparation of CeO₂/CaAl-LDHs/AC and its environmental applications[J]. Chemical Industry and Engineering Progree, 2016, 35(01): 182-188.

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二氧化铈/钙铝水滑石/活性炭的制备及环境应用

Preparation of CeO₂/CaAl-LDHs/AC and its environmental applications

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二氧化铈/钙铝水滑石/活性炭的制备及环境应用

Preparation of CeO2/CaAl-LDHs/AC and its environmental applications

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Preparation of CeO₂/CaAl-LDHs/AC and its environmental applications