Photocatalytic Degradation of Anionic Detergent From Aqueous Solution by Use of Tio2 Nanoparticles

Subject Areas : The Application of Chemistry in Environment

Received: 2015-10-08 Accepted : 2015-11-07 Published : 2016-04-20

Keywords: Photocatalytic degradation- LAS- UV/TiO‌2- TiO2 nanoparticles,

Abstract :

The Anionicdetergents are synthetic organic chemicals used in high volumes in household cleaning products. Alkyle benzene Solfunate(LAS), detergents,is one of the most widely employed anionic surfactants due to excellent cleaning properties. LAS can be toxic to aquatic organisms. LAS can also bio-accumulated in some fish,and eventually spreed through ecosystems via the food chain thus it should be removed from water. photo catalyst degradatinon process is one the developing technologies in removal of organic materials from water and wastewater. The aim of this study was the applicability of photodegradations of anionic detergent by use of TiO2 nanoparticles and their chang in to the nontoxic materials such as H2O and CO2 in a slurry reactor. in this study LAS solution (10mg/l)was prepared and in seprated stages was exposed to UV and TiO2 and a combination of them. also the effect of initial LAS concentration,TiO2 loading,pH,various type of UV irradiatin on degradation rate was studied. Maximum degradation was obtained at acidic pH,50 mg/l of TiO2, 30 min irradiation time, it is also showd that 99.5% of LAS was degradated in optimal codition. Kinetics analysis indicades that photocatalytic degradation rates of LAS can be approximated by pseudo-first order model. The mineralization of LAS is reported by measuring the initial and final COD of illuminated solution. Based on the results, UV/TiO2 process may be effectively applied in LAS removal in low concentration and For high concentration is not economically efficient.