Improvement in capacitive deionization function of activated carbon cloth by titania modification
Improvement in capacitive deionization function of activated carbon cloth by titania modification
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DOI：
10.1016/s0043-1354(02)00531-6
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发表时间：
2003-04-01
期刊：
影响因子：
12.8
通讯作者：
Seo, G
中科院分区：
文献类型：
--
作者：
Ryoo, MW;Seo, G
利用活性炭布表面的极性基团与钛、硅、铝、锆等金属醇盐反应，对其进行改性，以提高其电容去离子(CDI)性能。通过FE-SEM、X射线衍射仪、XPS和Zeta-电位仪的表面分析结果，推断了金属的结合状态和改性ACC的表面性质。二氧化钛以四面体配位的方式高度分散在ACC表面，掺杂的二氧化钛有效地减少了对氯化钠的物理吸附，增加了电场吸附，从而显著提高了CDI的性能。二氧化硅、氧化铝和氧化锆改性的贡献可以忽略不计，这表明二氧化钛的氧化还原电位较小是电场吸附增强的原因。还讨论了二氧化钛修饰的ACC吸附和脱附操作的可逆性，这与其CDI功能有关。(C)2002爱思唯尔科学有限公司。保留所有权利。
Activated carbon cloth (ACC) was modified by the reaction between polar groups on its surface and metal alkoxides of titanium, silicon, aluminum and zirconium to enhance its capacitive deionization (CDI) performance. Incorporated state of metals and surface property of modified ACC were deduced from surface analysis results obtained using FE-SEM, XRD, XPS and zeta-potential meter. Titania was highly dispersed on the ACC surface with tetrahedral coordination, and the incorporated titania was effective to decrease physical adsorption of NaCl and to increase electric field adsorption, resulting in a significant enhancement of CDI performance. The negligible contribution of silica, alumina and zirconia modifications suggested that the small oxidation-reduction potential of titania was responsible for the enhancement of the electric field adsorption. Reversibility of adsorption and desorption operation on titania-modified ACC were also discussed relating to its CDI function. (C) 2002 Elsevier Science Ltd. All rights reserved.