膜科学与技术

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Preparation and properties of a charged ceramic membrane from the local natural clay

Authors： FAN Baomin1, WEI Gang2, ZHAO Zijuan2, GUO Anru3, YANG Ruping3

Units： 1Department of Materials Science & Engineering, Beijing Technology and Business University, Beijing 100048, China; 2State Key Laboratory of Chemical Resource Engineering, Beijing University of Chemical Technology, Beijing 100029, China; 3Aerospace Research Institute of Materials & Processing Technology, Beijing 100076, China

KeyWords： natural clay; SiO2 support; ceramic membrane; ions retention; wastewater treatment

ClassificationCode：TQ174.7

year,volume(issue):pagination： 2016,36(3):26-32

Abstract：

A nano-scale ceramic membrane was prepared through particle sintering process from the local natural clay. The pore size distribution of membrane was between 3 and 12 nm based on the results of mercury porosimeter and field emission scanning electron microscope. Phase conversion of kaolinite occurred during sintering according to X-ray diffraction analysis. Comparing Fourier transform infrared spectra of the natural clay before and after sintering, it was found that plenty of inner hydroxyl existed in the clay; in addition, the bond of Al-O-Al was enhanced after sintering. The result of X-ray fluorescence showed that SiO2 and Al2O3 mainly constituted the natural clay. Comprehensive analysis of all the results indicated that the natural clay used in this study should be classified as the phyllosilicate. In dead-end filtration mode, the pure water permeability of natural clay membrane was about 1456 L·m-2·h-1·MPa-1. The as-prepared membrane could also reject Na3PO4 effectively. The rejection rate showed a decreasing trend as the concentration of Na3PO4 increased, but the decreasing extent was not so pronounced as the initial state. Electrokinetic properties indicated that the membrane was negatively charged in Na3PO4 solutions; therefore, high rejection rates of Na3PO4 might derive from the repulsive force between membrane and PO43- through electrostatic interaction.

Funds：

国家高技术研究发展计划项目(2009AA03Z802);北京工商大学青年教师科研启动基金(QNJJ2015-30)

AuthorIntro：

第一作者简介:樊保民(1986-),男,河南省焦作市人,博士,讲师,从事分离膜的制备与性能研究,E-mail:fanbaomin@btbu.edu.cn

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