Photocatalytic performance of TiO2/Clinoptilolite: comparison study in suspension and hybrid photocatalytic membrane reactor

Abstract

Comparison studies in suspension and hybrid photocatalytic membrane reactor (HPMR)system was investigated by using Reactive Black 5 (RB5)as target pollutant under UVA light irradiation. To achieve this aim, hybrid TiO2/clinoptilolite (TCP)photocatalyst powder was prepared by solid-state dispersion (SSD)methods and embedded at the outer layer of dual layer hollow fiber (DLHF)membranes fabricated via single step co-spinning process. TiO2 and CP photocatalyst were also used as control samples. The samples were characterized by Scanning Electron Microscopy (SEM), Energy Dispersion of X-ray (EDX), X-ray diffraction (XRD)and Brunauer–Emmett–Teller (BET)analyses. The result shows that TCP was actively functioned as photocatalyst in suspension system and 86% of RB5 photocatalytic degradation achieved within 60 min; however the additional step is required to separate the catalyst with treated water. In the HPMR system, even though the RB5 photocatalytic degradation exhibits lower efficiency however the rejection of RB5 was achieved up to 95% under UV irradiation due to the properties of photocatalytic membranes. The well dispersed of TCP at the outer layer of DLHF membrane have improved the surface affinity of DL-TCP membrane towards water, exhibit the highest pure water flux of 41.72 L/m2.h compared to DL-TiO2 membrane. In general, CP can help on improving photocatalytic activity of TiO2 in suspension, increased the RB5 removal and the permeability of DLHF membrane in HPMR system as well.