TiO2-incorporated polyelectrolyte composite membrane with transformable hydrophilicity/hydrophobicity for nanofiltration separation
| Autor: | Yucang Liang, Naixin Wang, Yahua Lu, Zhenping Qin, Quan-Fu An, Hongxia Guo |
|---|---|
| Rok vydání: | 2020 |
| Předmět: |
chemistry.chemical_classification
Environmental Engineering Aqueous solution General Chemical Engineering Methyl blue 02 engineering and technology General Chemistry 021001 nanoscience & nanotechnology Biochemistry Polyelectrolyte Congo red Biofouling chemistry.chemical_compound Membrane 020401 chemical engineering chemistry Chemical engineering Nanofiltration 0204 chemical engineering Counterion 0210 nano-technology |
| Zdroj: | Chinese Journal of Chemical Engineering. 28:2533-2541 |
| ISSN: | 1004-9541 |
| Popis: | The wettability of the membrane surface has shown obvious influent on the separation performance of the membrane. In this work, a hydrophilic PDA-[PDDA/TiO2]+ Cl− membrane was prepared by a one-step codeposition of poly(diallyldimethylammonium chloride) (PDDA) polyelectrolyte solution containing positively charged TiO2@PDDA nanoparticles with the assistance of dopamine (DA). Such positively charged membrane can be transformed into a hydrophobic membrane PDA-[PDDA/TiO2]+ PFO− via the counterion exchange between Cl− and PFO− (perfluorooctanoate). The transformation between hydrophilicity and hydrophobicity is reversible. For both hydrophilic and hydrophobic membranes, the nanofiltration performances were respectively investigated by the aqueous solution and ethanol solution of dyes including methyl blue (MB), Congo red (CR) and Evans blue (EB), and as well metal salt aqueous solution. The consecutive running stability and anti-fouling performance of both hydrophilic and hydrophobic membranes were explored. The results revealed that both membranes showed high nanofiltration performances for retention of dyes in (non)aqueous solution. For the hydrophilic membrane, the rejection of salts in a sequence is MgSO4 > Na2SO4 > MgCl2 > NaCl. Moreover, both of the hydrophilic and hydrophobic membranes showed high stability and antifouling property. |
| Databáze: | OpenAIRE |
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