Parameter effect on photocatalytic degradation of phenol using TiO2-P25/activated carbon (AC)

Abstract

P25 powder embedded and TiO 2 immobilized on activated carbon (TiO 2 -P25/AC) was prepared by P25 powder modified sol-gel and dip-coated method. The photocatalysts were characterized by XRD, BET, SEM and their photocatalytic activities were evaluated through phenol degradation in a fluidized bed photoreactor. The addition of P25 in the photocatalysts could significantly enhance the photocatalytic activity, and the optimum loading of P25 was 3 g L −1 . The operating parameter results indicated that the optimum pH for phenol degradation was 5.2; the effect of air flow rate gave an optimal value of 2 L min −1 ; the increasing of UV light intensity led to an increase of degradation efficiency due to more photons absorbed on the surface of the photocatalyst. The kinetics of the phenol degradation fitted well with the Langmuir-Hinshelwood kinetics model. Finally, the photocatalytic ability of TiO 2 -P25/AC was reduced only 10% after five cycles for phenol degradation.

Green synthesis of mesoporous anatase TiO2nanoparticles and their photocatalytic activities

“…Generally, heat treatment at high temperature could induce the crystallinity and phase transition of metal oxides. 36,37 In this case, only increase in crystallinity was observed as the temperature used for each cycle was 100 C. FESEM was used to analyse the surface morphology and porosity of TiO 2 NPs aer ten recycles. Fig.…”

Biosorption of cadmium (II) onto loquat leaves (Eriobotrya japonica) and their ash from aqueous solution, equilibrium, kinetics, and thermodynamic studies

“…Hence, it has rather great potential for the field application. Another point to be noted is that the photodegradation performance of immobilized titania might be enhanced by giving certain treatments, like aeration, pH adjustment, and controlling catalyst loading [1,43]. For example, an aeration treatment will provide a better mixing condition for the photocatalytic system, hence more contact between immobilized catalyst and the pollutants will likely occur [43].…”

“…Another point to be noted is that the photodegradation performance of immobilized titania might be enhanced by giving certain treatments, like aeration, pH adjustment, and controlling catalyst loading [1,43]. For example, an aeration treatment will provide a better mixing condition for the photocatalytic system, hence more contact between immobilized catalyst and the pollutants will likely occur [43]. In addition, it might supply sufficient amount of dissolved oxygen needed for the photodegradation reaction, thus increasing the photocatalytic activity of immobilized titania [43].…”

“…For example, an aeration treatment will provide a better mixing condition for the photocatalytic system, hence more contact between immobilized catalyst and the pollutants will likely occur [43]. In addition, it might supply sufficient amount of dissolved oxygen needed for the photodegradation reaction, thus increasing the photocatalytic activity of immobilized titania [43].…”

Use of photocatalysis for conversion of harvested rainwater as an alternative source into drinking water

“…Lam et al (2010) indicated similar results, and photons do not reach the surface of photocatalyst to activate it to generate hydroxyl radicals. Due to that, initial concentration range of 100 µg/L to 150 µg/L was chosen in order to determine the optimum value of the photocatalytic treatment process.…”