期刊
JOURNAL OF MEMBRANE SCIENCE
卷 561, 期 -, 页码 10-18出版社
ELSEVIER SCIENCE BV
DOI: 10.1016/j.memsci.2018.05.010
关键词
GO-TiO2; Microporous membranes; Sol-gel; Visible-light response
资金
- National Key Research and Development Program of China [2017YFB0306901]
- National Natural Science Foundation of China [21676139]
- Research Fund of state key Laboratory of Materials-Oriented Chemical Engineering [ZK201604]
- Higher Education Natural Science Foundation of Jiangsu Province [15KJA530001]
- Project of Priority Academic Program Development of Jiangsu Higher Education Institutions (PAPD)
Microporous graphene oxide (GO)-TiO2 membranes were successfully fabricated via an improved weak alkaline sol-gel route. Two-dimensional (2D) GO nanosheets were introduced into an alkaline catalyzed titania sol to form a crosslinked GO-TiO2 sol. Then the sol was directly dip-coated on a mesoporous support to transform into a toughened network-structured gel. SEM-EDX characterization indicated that sol infiltration could be effectively suppressed, benefiting from the GO nanosheets possessing a sufficiently large size in horizontal direction. Further, an integrated and crackless membrane layer with a thickness of 2 mu m was formed after sintering at 400 degrees C. The results of thermogravimetric (TG) and the X-ray photoelectron spectroscopy (XPS) analysis showed that GO still remained at the sintering temperature, which helps to reduce the membrane pore size. The filtration of Polyethylene glycol (PEG) and UV-vis diffuse reflectance spectra tests revealed that the prepared membrane possessed a pore size of similar to 1.8 nm and a band gap energy of 2.73 eV, resulting in visible-light response microporous GO-TiO2 membranes that could be fabricated directly by the facile method.
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