期刊
ENVIRONMENTAL RESEARCH
卷 204, 期 -, 页码 -出版社
ACADEMIC PRESS INC ELSEVIER SCIENCE
DOI: 10.1016/j.envres.2021.111943
关键词
PAMAM; PVDF; DMTMM; Membrane
资金
- National Natural Science Foundation of China [51973158]
- Science and Technology Plans of Tianjin [18JCYBJC18100, 18PTSYJC00180]
- Program for Innovative Research Team in University of Ministry of Education of China [IRT-17R80]
- Program for Innovative Research Team in University of Tianjin [TD13-5044]
- Tianjin Postgraduate Research and Innovation Project [2019YJSB195]
Heavy metal ions are a major pollutant in water pollution, and effectively removing them has become an important research topic in environmental protection. This study grafted different generations of hyperbranched polyamide-amine (PAMAM) onto PVDF membranes to obtain membranes with high adsorption capacity for heavy metal ions, showing good application potential and research value.
As one of the main pollutants of water pollution, the potential toxicity of heavy metal ions always threatens the safety of human and nature. Therefore, how to effectively remove heavy metal ions has become an important research topic in environmental protection. In the existing research, adsorption method is outstanding from many methods because of its high adsorption efficiency and easy operation. In this study, different generations of hyperbranched polyamide-amine (PAMAM) were grafted onto PVDF membrane to obtain the membrane with high adsorption capacity for heavy metal ions. The structure and physicochemical properties of the membranes were evaluated by means of fourier transform infrared spectroscopy (FT-IR), scanning electron microscopy (FESEM), element analyzer and X-ray photoelectron spectroscopy (EDX). At the same time, various factors affecting the adsorption process were studied, and it was found that the adsorption behavior of copper ion (Cu2+) on the membrane conformed to the pseudo-first-order kinetic model and Langmuir isotherm model. Moreover, after comparing the adsorption effect of the modified membranes grafted with different generations of PAMAM, it was found that the membrane grafted with the third generation PAMAM had the best adsorption when the solution pH was 5, and its maximum adsorption capacity could reach 153.8 mg/g. After five adsorption-desorption cycles, its adsorption capacity can reach 72.83% of the first test, indicating that it has good recycling performance. The results show that the adsorption membrane has good application potential and research value.
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