青岛科技大学  English 
赵梅
赞  

教师拼音名称:zhaomei

手机版

访问量:

最后更新时间:..

Graphene oxide modified polyamide reverse osmosis membranes with enhanced chlorine resistance

关键字:Polyamide reverse osmosis membrane; Chlorine resistance; Graphene oxide; Spin-coating

摘要:Improving chlorine resistance of polyamide (PA) reverse osmosis membranes is one of the major challenges in reverse osmosis membrane technology. In this study, few-layered graphene oxide (GO) was assembled onto polyamide thin film composite membrane surfaces through a spin-coating method to address this challenge. The coating solutions were used at different pH values and with different dispersion solvents. It was found that the pH values have great effects on membrane performance including maximizing water flux at a pH value of 6-7. XPS results indicate that the GO layer can protect the PA functional layer by absorbing chlorine radicals to form O-Cl bond. All modified membranes demonstrate a good suppression of membrane degradation in salt rejection upon chlorine exposure, and the degree of resistance to chlorine was enhanced with the increase of the number of GO layers. The GO(1)-coated membrane with GO nanosheets dispersed in ethanol showed increased water flux and good chlorine resistance. For instance, salt rejection varied from 95.3% to 91.6% for the first two hours, while unmodified membrane dropped to 80%. After 16 h of chlorine exposure, measured salt rejection of GO(1)-coated membrane was 75% but unmodified membrane was a less effective 63%.

卷号:525

期号:

是否译文:

崂山校区 - 山东省青岛市松岭路99号   
四方校区 - 山东省青岛市郑州路53号   
中德国际合作区(中德校区) - 山东省青岛市西海岸新区团结路3698号
高密校区 - 山东省高密市杏坛西街1号   
济南校区 - 山东省济南市文化东路80号©2015 青岛科技大学    
管理员邮箱:master@qust.edu.cn