摘要
将三聚氰胺烧制法制得的g-C_(3)N_(4)添加至PVDF铸膜液基体,采用相转化法制备g-C_(3)N_(4)/PVDF改性复合膜。X射线衍射、红外光谱和接触角测试实验结果表明,g-C_(3)N_(4)和PVDF有效结合,且在相转化过程中g-C_(3)N_(4)转移至膜表面,复合膜表面的亲水性增强。借助SEM发现g-C_(3)N_(4)/PVDF改性复合膜孔道和孔径均发生了改变。结合膜性能测试实验,证实其亲水性有较大提升,接触角降至58.6°,Jw为PVDF-0膜的2.5倍。此外g-C_(3)N_(4)能有效活化分子氧,产生超氧自由基用于有机污染物的光催化降解,对于BSA的截留率提高了56%左右,对亚甲基蓝溶液的截留率提高了49%,较纯PVDF膜有更优的抗污染性,通量恢复率可达85.28%。
In this study,g-C_(3)N_(4)prepared by melamine firing method was added to PVDF casting solution matrix,and g-C_(3)N_(4)/PVDF modified composite membrane was prepared by phase conversion method.The experimental results of X-ray diffraction,infrared spectroscopy and contact angle test show that g-C_(3)N_(4)is effectively combined with PVDF,and g-C_(3)N_(4)is transferred to the membrane surface during the phase transformation process,and the hydrophilicity of the composite membrane surface is enhanced.With the help of SEM,it was found that the pore channel and pore size of g-C_(3)N_(4)/PVDF modified composite membrane were changed.Combined with the membrane performance test,it is confirmed that its hydrophilicity is greatly improved,the contact angle is reduced to 58.6°,and the Jwis 2.5 times that of PVDF-0 membrane.In addition,g-C_(3)N_(4)can effectively activate molecular oxygen and produce superoxide free radicals for photocatalytic degradation of organic pollutants.The rejection rate of BSA is increased by about 56%,and the rejection rate of methylene blue solution is increased by 49%.Compared with pure PVDF membrane,g-C_(3)N_(4)has better pollution resistance,and the flux recovery rate can reach 85.28%.
作者
钱琪林
Qian Qilin(School of Environmental Engineering,Nanjing Institute of Technology,Nanjing 211167,China)
出处
《山东化工》
CAS
2022年第23期5-10,共6页
Shandong Chemical Industry
基金
2021年江苏省大学生创新创业训练计划项目:LAS降解菌—自清洁光催化膜构建智能化中水回用装置(项目编号:202111276012Z)。
