离子交换树脂的电再生机理研究
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摘要
为探究无膜电去离子(MFEDI)的再生机理,采用不同树脂组合进行电再生研究。通过测定各组树脂的再生电压、再生液电导率、pH等参数,对阴阳离子电迁移路径和系统内水解离情况进行了分析。结果表明,阳离子几乎不通过弱酸树脂进行电迁移;阴离子主要在强碱树脂间迁移;水解离主要发生在弱酸树脂与强碱树脂之间,为2种树脂的再生提供82.4%以上的H~+和OH~-。
In order to probe into the regeneration mechanisms of membrane-free deionization(MFEDI),various combinations of resins have been used in the research on electrical regeneration. Anionic and cationic electrical migra-tion paths and water dissociation situation in the systems have been analyzed by the determination of parameters during regeneration,such as regeneration voltages,regenerated liquid conductivities,pH,etc. The results show that almost no electrical migration occurs to the cation via weak-acid resins,whereas the anion mainly migrates among strong-base resins. Water dissociation mainly takes place at the interface between weak-acid resins and strong-base resins,which supplies more than 82.4% of H~+and OH~-for the regeneration of these two kinds of resins.
In order to probe into the regeneration mechanisms of membrane-free deionization(MFEDI),various combinations of resins have been used in the research on electrical regeneration. Anionic and cationic electrical migra-tion paths and water dissociation situation in the systems have been analyzed by the determination of parameters during regeneration,such as regeneration voltages,regenerated liquid conductivities,pH,etc. The results show that almost no electrical migration occurs to the cation via weak-acid resins,whereas the anion mainly migrates among strong-base resins. Water dissociation mainly takes place at the interface between weak-acid resins and strong-base resins,which supplies more than 82.4% of H~+and OH~-for the regeneration of these two kinds of resins.
引文
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[11]王方.混床离子交换树脂的电再生法[J].工业水处理,1997,22(2):1-7.
[12] Chen Xueming,Chen Guohua. Stable Ti/RuO2-Sb2O5-SnO2electrodes for O2evolution[J]. Electrochimica Acta,2005,50(20):4155-4159.
[13] Sauer M C,Southwick P F,Spiegler K S,et al. Electrical conductance of porous plugs:Ion exchange resin-solution systems[J]. Industrial&Engineering Chemistry,1955,47(10):2187-2193.
[2]沈健.高纯水与反渗透技术[J].给水排水,1998(4):32-37.
[3]陈雪明,肖艳,申小兰.一种无离子交换膜的电去离子系统:中国,202030567U[P]. 2011-11-09.
[4]陈雪明,申小兰,肖艳.氢氧气体直接外排的无膜电去离子方法与系统:中国,102583646B[P]. 2013-08-07.
[5] Su Wenqiu,Pan Ruoyun,Xiao Yan,et al. Membrane-free electrodeionization for high purity water production[J]. Desalination,2013,329:86-92.
[6] Su Wenqiu,Li Tianjun,Jiang Xiaping,et al. Membrane-free electrodeionization without electrode polarity reversal for high purity water production[J]. Desalination,2014,345:50-55.
[7] Shen X,Li T,Jiang X,et al. Desalination of water with high conductivity using membrane-free electrodeionization[J]. Separation and Purification Technology,2014,128:39-44.
[8] Hu Jiayuan,Chen Yujie,Zhu Liwei,et al. Production of high purity water using membrane-free electrodeionization with improved resin layer structure[J]. Separation and Purification Technology,2016,164:89-96.
[9] Simons R. Electric field effects on proton transfer between ionizable groups and water in ion exchange membranes[J]. Electrochimica Acta,1984,29(2):151-158.
[10] Meng Hong,Peng Changsheng,Song Shaoxian,et al. Electro-regeneration mechanism of ion-exchange resins in electrodeionization[J].Surface Review&Letters,2004,11(6):599-605.
[11]王方.混床离子交换树脂的电再生法[J].工业水处理,1997,22(2):1-7.
[12] Chen Xueming,Chen Guohua. Stable Ti/RuO2-Sb2O5-SnO2electrodes for O2evolution[J]. Electrochimica Acta,2005,50(20):4155-4159.
[13] Sauer M C,Southwick P F,Spiegler K S,et al. Electrical conductance of porous plugs:Ion exchange resin-solution systems[J]. Industrial&Engineering Chemistry,1955,47(10):2187-2193.