Developing anti-biofouling and energy-efficient cation-exchange membranes using conductive polymers and nanomaterials
| Autor: | Million Tesfai, Pei Xu, Guanyu Ma, Xuesong Xu, Huiyao Wang |
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| Rok vydání: | 2020 |
| Předmět: |
Conductive polymer
Chemistry Membrane fouling Filtration and Separation 02 engineering and technology Electrodialysis engineering.material 010402 general chemistry 021001 nanoscience & nanotechnology 01 natural sciences Biochemistry Desalination 0104 chemical sciences Biofouling Membrane Chemical engineering Coating engineering General Materials Science Coated membrane Physical and Theoretical Chemistry 0210 nano-technology |
| Zdroj: | Journal of Membrane Science. 603:118034 |
| ISSN: | 0376-7388 |
| Popis: | Membrane fouling, in particular biofouling is a major problem in membrane applications for water and wastewater treatment. In this study, cation-exchange membranes were modified with conductive polymer polyethyleneimine and nanomaterials such as titanium dioxide (TiO2) and graphene oxide (GO) to improve membrane anti-microbial properties and energy efficiency during electrodialysis. The anti-fouling potential was evaluated by quantitative measurement of biomass and biofilm accumulation on membrane surface with Escherichia coli (E. coli) as model microbes. Experimental results showed polyethyleneimine and nanomaterials coating changed membrane surface hydrophilicity and significantly improved anti-biofouling properties with an optimal nanomaterial dosage of 37.5 μg/mL of coating solution. Polyethyleneimine had limited effect on preventing microbial cell attachment, but demonstrated remarkable anti-biofilm growth by its cytotoxicity. Overall desalination performance of polyethyleneimine coated membrane was similar to unmodified membrane. GO coating significantly improved desalination efficiency because of its high conductivity and negative charge, while TiO2 coated membrane showed decreased overall desalination performance due to its reduced electrical conductivity. |
| Databáze: | OpenAIRE |
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