基于自组装和UV-辐射的GO/PES/SPSf复合膜的制备及其染料/盐选择性分离性能

Preparation of self-assembled GO/PES/SPSf composite membrane for selective separation of dyes and salts via self-assembled and UV irradiation approach

为实现染料和盐选择性分离,以PES/SPSf共混超滤膜为支撑体,采用层层自组装构建氧化石墨烯(GO)负载PES/SPSf复合膜,并且借助UV-光辐射(15 min)实现GO功能层与支撑层进一步交联及固定化,最后成功制备出GO/PES/SPSf复合膜;重点考察GO负载量对膜表面形貌、断面结构、亲水性、荷电性和渗透分离性能的影响。结果表明:当GO负载量为202 mg/m^(2)时,制备的复合膜纯水渗透率为53 L/(m^(2)·h·bar)(1 bar=0.1 MPa),对靛蓝磺酸钠(ICO)截留率为87.9%;在不同pH值和高含盐染料废水处理过程中,该复合膜对刚果红(CR)的截留率在90%以上,通量恢复率高达83%,表现出优异分离性能和运行稳定性。

In order to realize the selective separation of dye and salt,a new type of dense ultrafiltration membrane is devel-oped.A novel composite membrane(GO/PES/SPSf)is prepared using PES/SPSf blended ultrafiltration membrane as a support layer,and a thin grapheme oxide(GO)film as separation layer,the GO layer is covalent connected to the substrate by in-situ UV-light irradiation(15 min)induced chemical cross-linking reaction.The impact of GO loading on the surface morphology,hydrophilicity,chargeability,and separation performance of the com-posite membrane was investigated.XRD,Raman,SEM and AFM analyses were performed to characterize the composite membrane.The results show that the characteristic diffraction peaks of GO layers(110-face)disap-pear after UV modification.The GO chemically bonded to the substrate membrane is confirmed by its FI spec-trum.The composite membrane with 202 mg/m^(2) of GO loading(M2)displayes a pure water permeance of 53.0 L/(m^(2)·h·bar)and a sodium indigo sulfonate(ICO)rejection of 87.9%.In the treatment of Congo red(CR)con-taining wastewater with different pH values and salt content,the rejection rate of CR is above 90%combined with good operational stability,and a high flux recovery rate of 83%.The above results indicate the GO/PES/SPSF composite membrane shows a great perspective in dye and salt containing waste water treatment.