摘要
超支化聚合物聚酰胺-胺(PAMAM)含有大量端氨基和酰胺基团,可以通过络合配位作用吸附重金属离子,增加代数可进一步提高其吸附能力。本工作将不同代数的PAMAM分别与聚偏氟乙烯(PVDF)共混,通过浸没沉淀相转化法制备出能够吸附铜离子的PVDF/PAMAM复合膜。利用红外光谱(ATR-FTIR)、X射线光电子能谱(XPS)、场发射扫描电镜(FESEM)以及原子力显微镜(AFM)等表征手段对膜的结构与形貌进行表征。通过纯水通量测试可知,膜的纯水通量由PVDF膜的64.86 L/(m^2·h)提高到PVDF/G4.0 PAMAM复合膜的424.00 L/(m^2·h),膜的亲水性得到显著提高。重金属离子静态吸附实验表明,PVDF/PAMAM复合膜对铜离子的吸附量由PVDF膜的2.60 mg/g提高到22.65 mg/g,提高了约7.70倍。通过分析吸附等温线可知,PVDF/PAMAM复合膜能够持续吸附铜离子,在550 min时还能够持续吸附,吸附动力学符合准二级动力学模型,属于化学吸附。PVDF/PAMAM共混拓宽了PVDF膜在吸附重金属领域的应用。
The hyperbranched polyamidoamine(PAMAM)have a large number of amine-terminated groups and amide groups,which can adsorb heavy metal ions by coordination,and further increase the adsorption capacity by increasing the number of generation.In this work,the different generation of PAMAM were added to a casting solution of polyvinylidene fluoride(PVDF)by blending,and PVDF/PAMAM membranes having an adsorption capacity for removing copper ions were prepared by immersion precipitation phase inversion.The structure and morphology of the membranes were characterized by infrared spectroscopy(ATR-FTIR),X-ray photoelectron spectroscopy(XPS),field emission scanning electron microscopy(SEM)and atomic force microscopy(AFM).Static contact angle and pure water flux were studied,and the results found that the pure water flux of PVDF/G4.0 PAMAM membranes were increased from 64.86 L/(m^2·h)of PVDF membranes to 424.00 L/(m^2·h),and the hydrophilicity of membranes were improved.Static adsorption experiments showed that the adsorption capacity of copper ions by PVDF/PAMAM membrane increased to 22.65 mg/g compared to PVDF membranes,which was 7.70 times higher than that of PVDF membrane.By adsorption isotherm analysis,the PVDF/PAMAM membrane can continuously adsorb copper ions,and continue to adsorb at 550 min.The adsorption kinetics accorded with the quasi-secondary kinetic model and belonged to chemical adsorption.The PVDF blend PAMAM membrane broadened the application of PVDF membrane in the field of adsorption of heavy metals.
作者
张筱烨
孙赫宇
何洋
李健健
冯霞
赵义平
陈莉
ZHANG Xiaoye;SUN Heyu;HE Yang;LI Jianjian;FENG Xia;ZHAO Yiping;CHEN Li(State Key Laboratory of Separation Membranes and Membrane Processes,School of Materials Science and Engineering,Tianjin Polytechnic University,Tianjin 300387,China)
出处
《材料导报》
EI
CAS
CSCD
北大核心
2020年第4期142-147,共6页
Materials Reports
基金
天津市科技计划项目(17YFZCSF01230)~~
