期刊
CERAMICS INTERNATIONAL
卷 42, 期 7, 页码 8155-8164出版社
ELSEVIER SCI LTD
DOI: 10.1016/j.ceramint.2016.02.022
关键词
Porosity; Mullite; Ceramic microfilter membrane; Free silica removal; Response surface methodology
In this paper effect of free silica removal from mullite microfilter membranes using different sodium hydroxide (NaOH) concentrations at different temperatures and for different removal times was studied. The prepared membranes were subjected to XRD, SEM, porosity analysis, and mechanical strength measurement. Response surface methodology (RSM) based on central composite design (CCD) was used to design the experiments and analyze three operating parameters including; NaOH solution concentration, NaOH solution temperature and removal time. The optimum porosity of 49.4 was obtained with NaOH solution concentration of 35 wt% at temperature 75 degrees C and removal time equal to 8 h. Water flux and mechanical strength as important characteristics were measured for all the membranes. For the membrane with the optimum porosity, water flux, mechanical strength, and free silica removal percentage were 61.7 kg/m(2) h, 21.6 MPa, and 28.2%, respectively. The maximum rejection percentage was 97.2% and emulsion flux for this state was 15.6 kg/m(2) h at temperature 25 degrees C and cross flow velocity of 1.5 m/s. (C) 2016 Elsevier Ltd and Techna Group S.r.l. All rights reserved.
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