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XRF and nitrogen adsorption studies of acid-activated palygorskite

Published online by Cambridge University Press:  09 July 2018

Junping Zhang ,
Qin Wang ,
Hao Chen  and
Aiqin Wang
Junping Zhang
Affiliation:
Center of Eco-material and Eco-Chemistry, Lanzhou Institute of Chemical Physics, Chinese Academy of Sciences, Lanzhou, 730000, P.R.China Key Laboratory for Palygorskite Science and Applied Technology of Jiangsu Province, Huaian 223003, P.R. China
Qin Wang
Affiliation:
Center of Eco-material and Eco-Chemistry, Lanzhou Institute of Chemical Physics, Chinese Academy of Sciences, Lanzhou, 730000, P.R.China
Hao Chen
Affiliation:
School of Pharmaceutical and Chemical Engineering, Taizhou University, Linhai, 317000, P.R. China
Aiqin Wang*
Affiliation:
Center of Eco-material and Eco-Chemistry, Lanzhou Institute of Chemical Physics, Chinese Academy of Sciences, Lanzhou, 730000, P.R.China Key Laboratory for Palygorskite Science and Applied Technology of Jiangsu Province, Huaian 223003, P.R. China
*
*E-mail: aqwang@lzb.ac.cn
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Abstract

The effects of acid activation on the chemical composition, surface area and pore structure of palygorskite from Xuyi (Jiangsu, P.R. China) were investigated systematically using X-ray fluorescence (XRF) and BET techniques. The palygorskite samples were activated with HCl, H2SO4 and H3PO4 of various concentrations at 80ºC for 4 h. The influences of acid concentration and acid type on the chemical composition, adsorption-desorption isotherms at 77 K, pore-size distribution, surface area and pore volume were studied in detail. The contents of most components of palygorskite decrease with increasing acid concentration except for Si and Ti. HCl shows a greater activation activity and its effect on the dissolution of components of palygorskite is greater than that of H2SO4 and H3PO4. It was found that 3 mol l–1 H3PO4 is a more efficient activator for increasing the number of micropores in palygorskite, whereas 12 mol l–1 HCl is more suitable for use in enhancing the number of meso- and macropores. The acid concentration and acid type have a great influence on the surface area and pore volume. HCl is the most effective at enhancing the external surface area and mesopore volume of palygorskite, whereas, H3PO4 is more suitable for use in improving the micropore surface and volume.

Keywords

palygorskitemicroporemesoporemacroporeacid activationX-ray fluorescenceBETHClH2SO4H3PO4
Type
Research Article
Information
Clay Minerals , Volume 45 , Issue 2 , June 2010 , pp. 145 - 156
Copyright
Copyright © The Mineralogical Society of Great Britain and Ireland 2010

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