期刊
MEMBRANES
卷 12, 期 4, 页码 -出版社
MDPI
DOI: 10.3390/membranes12040386
关键词
TiO2 nanoparticles; dispersion; stability; composite membrane; antifouling property
类别
资金
- Professorial and Doctoral Scientific Research Foundation of Huizhou University [2020JB029]
- National Natural Science Foundation of China [51162026, 52000046]
- Major Project of Fundamental and Application Research of the Department of Education of Guangdong Province [2015KTSCX132, 2017KZDXM080]
- Science and Technology Foundation of Huizhou [2019 x 070516]
- Special Project of Guangxi Science and Technology Base and Talent [GuiKe AD20297009, GuiKe AD20297007]
- Middle-Aged and Young Teachers' Basic Ability Promotion Project of Guangxi [2020KY05039, 2021KY0221]
In this study, the influence of different dispersion status of TiO2 nanoparticles on membrane properties and antifouling performance was investigated. Pre-dispersing TiO2 nanoparticles with PEG improved the membrane performance by ensuring uniform pores and structures, larger porosity and water permeability, better hydrophilicity, and higher antifouling ability.
Titanium dioxide (TiO2) nanoparticles have been applied in membrane antifouling performance modification for years. However, the influence of TiO2 nanoparticle dispersion status during the blending process on membrane properties and the inner mechanism has seldom been focused on. Herein, we investigated the influence of the various dispersing statuses of TiO2 nanoparticles on membrane properties and antifouling performance by exploring various blending processes without changing the original recipe. Polyethylene glycol (PEG) was employed as a pore-forming agent during the membrane preparation process, and also as a pre-dispersing agent for the TiO2 nanoparticles via the steric hindrance effect. Compared to the original preparation process of the PVDF/TiO2 composite membrane, the pre-dispersing of TiO2 via PEG ensured a modified membrane with uniform surface pores and structures on cross-sectional morphologies, larger porosity and water permeability, and more negative zeta potential. The contact angle was decreased by 6.0%, implying better hydrophilicity. The improved antifouling performance was corroborated by the increasing free energy of cohesion and adhesion, the interaction energy barrier (0.43 KT) between the membrane surfaces and approaching foulants assessed by classic XDLVO theory and the low flux decline in the filtration experiment. A kinetics mechanism analysis of the casting solutions, which found a low TSI value (<1.0), substantiated that the pre-dispersion of TiO2 with PEG contributed to the high stability and ultimately favorable antifouling behaviors. This study provides an optimized approach to the preparation of excellent nano-TiO2/polymeric composite membranes applied in the municipal sewage treatment field.
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