Preparation of glass hollow fibre nanofiltration membrane and Congo red dye separation
A glass hollow fibre nanofiltration membrane which was used for congo red dye separation was prepared via a combined procedure including non-solvent induced phase inversion, calcination and acid etching. An asymmetric pore structure was observed. After acid etching, the main phase of the acquired nanofiltration membrane was SiO2; the functional layer whose average pore size was 2–3 nm was on the outer surface, the average diameters of macropores was over 70 μm. The water permeability flux decreased and the rejection of congo red dye increased as a function of the calcination temperature due to densification of the membrane outer surface. The separation of congo red was over 95% while the driven pressure ran at 0·5 MPa. The glass nanofiltration membrane demonstrates good application prospects in preventing dyestuff from the textile industry being released into the environment. At the same time, it was imagined that the glass hollow fibre membrane can be fabricated via a simple method using recycled waste glass, thus supporting the environment.
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Document Type: Research Article
Publication date: February 1, 2018