Photo-Degradation of Phenol Using TiO۲/CMK-۳ Photo-Catalyst Under Medium Pressure UV Lamp

Phenol is considered as one of the major environmental concerns due to its characteristics including chronic toxicity, biological stability, and increasing the toxicological intermediates after biological degradation. Therefore, the aim of this study was to evaluate the photo-degradation of phenol using the titanium dioxide (TiO۲) photo-catalyst on ordered mesoporous carbon (CMK-۳) support under UV irradiation. In this study, the effects of some parameters including pH value (۴, ۵, ۶, ۷, ۸, ۹, ۱۰), TiO۲/CMK-۳ concentration (۰.۰۵, ۰.۱, ۰.۱۵, ۰.۳, ۰.۵ g/L), irradiation time (۳۰, ۶۰, ۹۰, ۱۲۰, ۱۵۰ min), and phenol concentration (۵۰, ۱۰۰, ۱۵۰ and ۲۰۰ mg/L) were assessed. The properties of the CMK-۳ and TiO۲/CMK-۳ were compared using the transmission electron microscopy (TEM), X-ray powder diffraction (XRD) and N۲ adsorption-desorption isotherm. The results revealed that the process studied was remarkably affected by the parameters, and the optimum values of the parameters were as follows: pH=۶, TiO۲/CMK-۳ concentration =۰.۱۵ g/L, phenol concentration = ۱۰۰ mg/L, and irradiation time=۱۵۰ min. The phenol degradation efficiency and total organic carbon (TOC) removal efficiency for phenol were ۹۶% and ۷۴%, respectively. Moreover, the stability greater than ۷ times for the studied photo-catalyst was indicative of its high potential to be used in photo-degradation processes for the elimination of pollutants.

Keywords:

TiO۲/CMK-۳ , Photocatalytic degradation , Phenol , UV irradiation