吸附-电催化氧化与纳滤法的耦合过程研究

项目名称： 吸附-电催化氧化与纳滤法的耦合过程研究

项目编号： No.21276177

项目类型： 面上项目

立项/批准年度： 2013

项目学科： 化学工业

项目作者： 许莉

作者单位： 天津大学

项目金额： 78万元

中文摘要： 膜污染和浓差极化限制了纳滤技术在处理难生物降解类废水领域的应用。本课题组研究发现，电催化氧化与纳滤相耦合能够缓解膜污染和浓差极化，但耦合机理有待进一步阐明。在预实验中，我们发现：Ti/SnO2-Sb2O3电极在DL、DK纳滤膜表面进行电催化氧化，渗透通量随电流密度或电压的增加而增加最后达到稳定，但具体影响机理不明。此外，最新研究发现，吸附材料改性电极可以降低电极的电子传递阻力，提高电极的吸附能力。结合文献及既往的工作基础，我们推测吸附协同电催化氧化能去除污染组分中的不饱和键和疏水部分降低过滤阻力和渗透通量衰减。我们拟制备吸附材料改性吸附-电催化电极，从三方面（吸附作用、电催化氧化、膜污染和浓差极化）的相互影响阐明吸附-电催化氧化与纳滤的耦合过程机理，并利用Monte-Carlo法和气液两相传质-扩散机理对耦合过程进行模拟。此研究为开发经济高效废水处理技术提供了新思路。

中文关键词： 吸附-电催化氧化；纳滤；耦合过程；电极；处理废水

英文摘要： Although nanofiltration membrane technology can be capable of treating non-biodegradable effluent, permeation flux decline due to concentration polarization and fouling is the major obstacle to the NF process. From our study, the crossflow membrane filtration is enhanced by the electrocatalysis oxidate of the membrane surface, but the synergistic mechanism of electrocatalysis and nanofiltration needs further study. We discovered that along with the increase of current density or voltage, the permeation flux is enhanced and tends smooth in the pre-experiment of adding the electro-catalytic caused by Ti/SnO2-Sb2O3 on the surface of DL and DK NF membranes. In addition, based on the recent research, adsorbent modification electrodes can decrease the electron transfer resistance and enhance the adsorptivity of the electrode. Based on the relevant papers and our previous studies, we reasoned that the synergistic of adsorption and electrocatalysis might selective remove unsaturated bonds and hydrophobic components in the dissolved organic matters in addition reduce the NF process resistance and penetration flux decline. We are prepare to make adsorption-electrocatalytic electrodes then clarify the synergistic mechanism through studying the relationships between adsorption, electrocatalysis, concentration polarization a

英文关键词： synergistic process；adsorption-electrocatalysis；nanofiltration；electrode；wastewater treatment