Study of three-phase catalysis and degradation mechanism of flexible 3D pore electrostatic spinning photocatalytic membrane

Photocatalytic advanced oxidation has been widely studied for purifying organic polluted water bodies. The molding of powder catalyst is able to solve the problems of difficult recycling and secondary pollution, and it further promotes the practical application of photocatalytic materials. In this work, PAN and PVDF are used as precursors to prepare polymer blended fiber membranes using electrostatic spinning technique. In order to achieving the degradation of Rh-B via photocatalysis, PAPV@MT photocatalytic membrane is prepared in company with acrylic acid modification and in-situ growth of MoS2/TiO2 via hydrothermal method. As a result, the photocatalytic film exhibits good stretchability, flexibility, and high catalytic degradation capacity. At the same time, the special structure of the hydrophobic surface on the membrane layer enables the photocatalytic membrane to hold a three-phase, i.e., solid-liquid-gas. Considering Rh-B as target contaminant, waste water can be decolorized within 150 min with a removal rate of 80%, benefiting from the introduction of MoS2. It promotes the separation of electron-hole pairs, so that its catalytic capacity is significantly enhanced. Therefore, the membranes reported here provide ideas for practical applications, with properties of stable, highly catalytic active photocatalytic.