Synthesis and Modeling of Charged Ultrafiltration Membranes of Poly(styrene-co-divinyl benzene) for the Separation of Chromium(VI)
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- 作者：Sonny Sachdeva ; Anil Kumar
- 刊名：Industrial & Engineering Chemistry Research
- 出版年：2008
- 出版时间：June 18, 2008
- 年：2008
- 卷：47
- 期：12
- 页码：4236 - 4250
- 全文大小：3536K
- 年卷期：v.47,no.12(June 18, 2008)
- ISSN：1520-5045
文摘
A ceramic supported cross-linked polystyrene (PS) composite membrane has been prepared from its monomers using a dual initiator system, and it has been chemically modified by gas-phase nitration (using NOx), amination using hydrazine hydrate, and quaternization using dichloroethane and triethylamine. The membranes (unmodified, aminated, and quaternized) have been used to study the rejection of chromium(VI) as a function of pressure, concentration, and pH of the feed solution, which was observed to be >90%. The experimental results have been fitted using a space charge model (SCM) to obtain the membrane wall potential and membrane surface concentration. The transport through the membrane capillaries has been described by a two-dimensional model, using the Nernst−Planck equation for ion transport, the Navier−Stokes equation to describe the flow, and the Poisson−Boltzmann equation for the radial distribution of potential. A semianalytical series solution to the highly nonlinear Poisson−Boltzmann equation has been developed, to reduce the computational time required to solve the set of coupled differential equations. The effective wall potential was determined to be 85.95 and 78.7 mV for the quaternized and aminated membranes, respectively.