Abstract
Membrane separation technology holds tremendous potential in treating dye wastewater. However, the widespread issue of membrane fouling leads to a significant decline in separation efficiency and lifespan. In this paper, titanium dioxide (TiO2)/carboxyl multi-walled carbon nanotube (CMWCNT)/calcium alginate (CaAlg) membranes were prepared by blending and simple cross-linking methods. The influence of TiO2 and CMWCNT concentrations on membrane performance, especially the anti-swelling performance, was explored. Additionally, the mechanical properties, filtration performance, fouling resistance, and dye/salt separation performance of the composite membrane were investigated. Notably, the rejection rate of dye molecules (Mw > 696 Da) was greater than 98 %, while the rejection rate of salt was less than 11.0 %. Furthermore, two methods for environmental-friendly cleaning membrane, photocatalytic degradation and advanced oxidation activated by monopersulfate, were performed. Finally, the photocatalytic degradation process and mechanism of Congo red (CR) were investigated by electron spin resonance (ESR).
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