Full-Text Search:
Home|Journal Papers|About CNKI|User Service|FAQ|Contact Us|中文
《Materials Review》 2018-S1
Add to Favorite Get Latest Update

Optimization of the Chlorine Oxidation Resistance of Low-temperature Plasma Modified Cation Exchange Membrane by Uniform Design

CHEN Cunkai;DING Yun;YUN Qian;LI Xin;YANG Qing;School of Environmental and Municipal Engineering,Lanzhou Jiaotong University;The Engineering Research Center of Ministry Education of Water Resources Comprehensive,Utilization in Cold and Arid Areas,Lanzhou Jiaotong University;  
Using ion exchange membrane to build a double membrane three-compartment electrode is a new green hydrometallurgical process to produce metallic cobalt.Currently,ordinary heterogeneous cation exchange membrane used in the market on this process is easy to be oxidized by hypochlorous acid produced by the anode which results in the membrane performance degradation and affects the process effect.Therefore,improving the chlorine resistance of the ion exchange membrane is the key technology of the process.The cation-exchange membrane was modified by low temperature plasma and immersed into the polyvinylidene fluoride(PVDF)graft coating solution by homogeneous design experiment in this paper.It is expected to improve the resistance to chlorine oxidation of ion exchange membranes by for ming high-energy,fluorine-containing functional groups on the membrane surface protective layer.Strong oxidizing environment was simulated through active chlorine immersion method and the leakage rate of chloride ion was used as characterization indicator.The regression equation is obtained by utilizing software SPSS 23 to regression analyze the data of uniform design and R2=0.972,the equation is significant.Through the t test of the coefficient,the four most influential factors are selected:discharge current intensity of plasma,discharge time,grafting concentration and grafting duration.Finally,combining the inversion with the contour map method to optimize the equation.The final prediction parameters of optimal modified test are the discharge current of 6 A,the discharge time of 5 min,the grafting liquid concentration of 8%,and the grafting time of 60 min.Verification tests showed that chloride ion leakage rate of modified ion exchange membrane was 57.56%,higher than that of the original membrane,and the resistance to chlorine oxidation of the membrane was improved substantially.
【Fund】: 国家自然科学基金(21666017);; 国家科技支撑计划(2015BAE04B01)
【CateGory Index】: TQ425.236
Download(CAJ format) Download(PDF format)
CAJViewer7.0 supports all the CNKI file formats; AdobeReader only supports the PDF format.
©2006 Tsinghua Tongfang Knowledge Network Technology Co., Ltd.(Beijing)(TTKN) All rights reserved