摘要
采用硫酸、硝酸混酸改性多壁碳纳米管(MWCNTs),通过化学水热法在改性的MWCNTs表面负载纳米Fe_3O_4,将负载Fe_3O_4的MWCNTs(MWCNTs/Fe_3O_4)与PVC在无磁场、有磁场作用下共混制膜,获得MWCNTs无序排列、有序排列修饰的PVC超滤膜,同时,制备了纯PVC膜以作比较.对共混膜有序修饰机制及断面形态进行了分析,对相关性能参数如接触角、膜的溶胀、膜孔隙率、膜平均孔径、纯水通量、截留性能及吸附性能等进行了研究.研究结果表明:MWCNTs/Fe_3O_4的加入使膜的亲水性、纯水通量、截留性能等有了显著提高,MWCNTs有序排列修饰使膜在表皮层形成了更加致密,更为狭长的微孔结构,具有了更优异的导流网络通道,在长时间运行条件下仍能保持良好的过滤负荷,提高了膜的性能.
Multi-walled carbon nanotubes（ MWCNTs） were modified by sulfuric acid and nitric acid,then were loaded with Fe3O4 nanoparticles through a chemical hydrothermal method. The magnetic hybrids（ MWCNTs / Fe3O4） were blended with polyvinyl chloride（ PVC） to prepare ultrafiltration（ UF）membranes with or without a magnetic field to obtain order- or disorder-modified MWCNTs in membranes. meanwhile,PVC UF membrane was also prepared as a control. The mechanism for ordered modification of the membranes were analyzed. The membrane properties such as contact angle,swelling,porosity,average pore size,pure water flux,rejectionand adsorption were examined and compared. The results show that the addition of MWCNTs / Fe3O4 significantly improved hydrophilcity of membrane surfaces,pure water flux and rejection. Ordered modified MWCNTs membrane formed a more compact nad narrow pore structure,and a superior network of diversion channels. a good filtering load can still be maintained after long time running.
出处
《环境科学学报》
CAS
CSCD
北大核心
2016年第6期2013-2019,共7页
Acta Scientiae Circumstantiae
基金
污染控制与资源化研究国家重点实验室开放课题(No.PCRRF14006)
华南理工大学SRP项目(No.2015)~~
关键词
多壁碳纳米管
序列修饰
聚氯乙烯
共混膜
Multi-walled carbon nanotubes
ordered modification
polyvinyl chloride
blended membranes
