Preparation of zirconium phosphate (ZrP)/Nafion1135 composite membrane and H⁺/VO²⁺ transfer property investigation

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• 作者：Shangbin Sang ; Qiumei Wu ; Kelong Huang
• 关键词：Zirconium phosphate ; Nafion1135 ; Composite membrane ; Conductivity ; Cation selectivity
• 刊名：Journal of Membrane Science
• 出版年：2007
• 期刊代码：55_03767388
• 类别：ch
• 出版时间：15 November 2007
• 卷：305
• 期：1-2
• 页码：118-124
• 文件大小：817 K

摘要

The zirconium phosphate (ZrP)/Nafion1135 composite membranes were prepared by impregnating method and characterized by SEM, XRD, ac impedance and electron probe microanalysis (EPMA) techniques. The results show that ZrP(α-Zr(HPO₄)₂·H₂O) deposited both on Nafion1135 membrane surface and in its inner structure, and the amount of deposited ZrP increases with the immersion time. A test of membrane resistance shows that the membrane resistance increases with the immersion time greatly in me="mml15">tyle="text-decoration:none; color:black" href="/science?_ob=MathURL&_method=retrieve&_udi=B6TGK-4PBDPYY-1&_mathId=mml15&_user=10&_cdi=5257&_rdoc=14&_acct=C000050221&_version=1&_userid=10&md5=5dc9d987c9175a990306af991759845a" title="Click to view the MathML source">C_VO²⁺:C_H⁺ = 0.009trong>:trong>0.1 mol L⁻¹ H₂SO₄ + VOSO₄ solution than in 0.05 mol L⁻¹ H₂SO₄ solution. Subsequently, the proton diffusion coefficient me="mml16">thURL&_method=retrieve&_udi=B6TGK-4PBDPYY-1&_mathId=mml16&_user=10&_cdi=5257&_rdoc=14&_acct=C000050221&_version=1&_userid=10&md5=dcd5564218250ed83f470880c1bab993">mg src="http://www.sciencedirect.com/cache/MiamiImageURL/B6TGK-4PBDPYY-1-J/0?wchp=dGLbVzb-zSkzk" alt="Click to view the MathML source" align="absbottom" border="0" height=17 width=30> and VO²⁺ diffusion coefficient me="mml17">thURL&_method=retrieve&_udi=B6TGK-4PBDPYY-1&_mathId=mml17&_user=10&_cdi=5257&_rdoc=14&_acct=C000050221&_version=1&_userid=10&md5=b41a0b29f1d341f0b24e09853c75c915">mg src="http://www.sciencedirect.com/cache/MiamiImageURL/B6TGK-4PBDPYY-1-K/0?wchp=dGLbVzb-zSkzk" alt="Click to view the MathML source" align="absbottom" border="0" height=18 width=44> in membrane are evaluated. It is found that both me="mml18">thURL&_method=retrieve&_udi=B6TGK-4PBDPYY-1&_mathId=mml18&_user=10&_cdi=5257&_rdoc=14&_acct=C000050221&_version=1&_userid=10&md5=72ae441f9dd188e0de4bccbae4be9103">mg src="http://www.sciencedirect.com/cache/MiamiImageURL/B6TGK-4PBDPYY-1-M/0?wchp=dGLbVzb-zSkzk" alt="Click to view the MathML source" align="absbottom" border="0" height=17 width=30> and me="mml19">thURL&_method=retrieve&_udi=B6TGK-4PBDPYY-1&_mathId=mml19&_user=10&_cdi=5257&_rdoc=14&_acct=C000050221&_version=1&_userid=10&md5=e8cc7d40e7d27a931c5847be788eaa8b">mg src="http://www.sciencedirect.com/cache/MiamiImageURL/B6TGK-4PBDPYY-1-N/0?wchp=dGLbVzb-zSkzk" alt="Click to view the MathML source" align="absbottom" border="0" height=18 width=44> decrease with the immersion time based on the retarding effect of the deposited ZrP.

The proton diffusion coefficient in Nafion1135 was determined to be 3.412 × 10⁻¹² m² s⁻¹, and a slightly lower value of 2.827 × 10⁻¹² m² s⁻¹ was found in Nafion1135/ZrP5 membrane.

However, the VO²⁺ diffusion coefficient me="mml20">thURL&_method=retrieve&_udi=B6TGK-4PBDPYY-1&_mathId=mml20&_user=10&_cdi=5257&_rdoc=14&_acct=C000050221&_version=1&_userid=10&md5=c78c5bd3be05d1e4cbde4d6ff6d4e8e9">mg src="http://www.sciencedirect.com/cache/MiamiImageURL/B6TGK-4PBDPYY-1-P/0?wchp=dGLbVzb-zSkzk" alt="Click to view the MathML source" align="absbottom" border="0" height=18 width=44> of the Nafion1135 membrane, 4.012 × 10⁻¹³ m² s⁻¹, is much higher than that of 1135/ZrP5 composite membrane, 0.3226 × 10⁻¹³ m² s⁻¹. The results show that the composite membrane has better permselectivity as to H⁺ and VO²⁺ than Nafion^®1135 membrane.