壳聚糖/碳纳米管多孔膜的制备及其吸附与截留性能

以壳聚糖为成膜聚合物,聚乙二醇(PEG)为致孔剂,掺入碳纳米管(CNTs),经机械共混制备了纳米级孔径且分布良好的复合多孔膜.扫描电镜(SEM)图片显示,CNTs的加入使得膜产生许多分布均匀30~50nm的纳米孔,且膜的孔隙率随CNTs含量的增加而增加.甲基橙吸附实验结果表明膜对甲基橙的吸附量随CNTs含量的增加呈现先增大后减小的趋势.膜对硫酸铜溶液的过滤实验表明,CNTs的加入改善了膜的通水能力,膜的水通量随CNTs含量的增加而增加,当CNTs增加到一定量后,膜的水通量出现减小;膜对Cu2+的截留能力随CNTs含量的增加而提高,当CNTs增加到一定量后,截留率也出现了下降.

Preparation of Chitosan/Multi-walled Carbon Nanotubes Membrane and Its Performance of Methyl Orange Adsorption and Cu2+ Rejection

A porous chitosan/PEG/carbon nanotubes (CNTs) membrane with nanometer scale pores and good distribution was prepared by mechanical blending. Scanning electron microscope (SEM) images showed that 30~50 nm pores with homogeneous distribution appeared on the membrane when CNTs was added, and the porosity increased with the increase of CNT content. Methyl orange adsorption experiment showed that the adsorption quantity of the membrane increased first, and then decreased with the increase of the CNTs content. Copper sulfate solution filtration experiment showed that the water transport behavior of the membrane was improved with the addition of CNTs. At first, the water flux of membrane increased with the increase of CNTs content, but when CNTs content reached a certain value, the water flux decreased. The rejection rate of Cu2+ increased with the increase of CNTs content at first, and when CNTs content reached a certain value, the rejection also decreased.