PHOTOCATALYTIC DEGRADATION OF THE ORGANOPHOSPHORUS PESTICIDE FENTHION IN AQUEOUS SUSPENSIONS OF TiO2 UNDER UV IRRADIATION
نویسندگان
چکیده
In present study the photocatalytic degradation of the organophosphorus pesticide fenthion, under UV irradiation in the presence of titanium dioxide (TiO2) photocatalyst, in aqueous suspensions has been investigated and compared with the photodegradation by hydrogen peroxide (H2O2) solution as an oxidant agent. The experiments were carried out in a 250mL pyrex UV laboratory-constructed photoreactor equipped with four 18W low pressure mercury lamps emitting irradiation at 365nm, whereas the maximum light intensity of the irradiation system was 14.5mW cm at a distance of 15cm. Remaining concentration of fenthion was determined by Gas Chromatography and Nitrogen Phosphorus Detector (GC-NPD) means. The degradation kinetics were studied under different experimental conditions, such as the amount of the photocatalyst, the initial concentration of fenthion, the illumination time, the presence of H2O2 as an oxidant/electron acceptor and the oxidant’s initial concentration.
منابع مشابه
Photocatalytic Degradation of an Anionic Surfactant by Tio2 Nanoparticle under UV Radiation in Aqueous Solutions
In this paper the photocatalytic degradation of the anionic surfactant, linear alkylbenzene sulfonicacid (LABSA) was investigated using UV radiation in the presence of TiO2. Our findingsdemonstrate that various parameters exert their individual influence on the photocatalytic degradationof surfactant in wastewaters. The mentioned parameters have been categorized as follow: the initialpH of the ...
متن کاملTitanium dioxide mediated photocatalytic degradation of malathion in aqueous phase
The photocatalytic degradation of technical grade pesticide ‘malathion’ has been studied in aqueous suspensions of TiO2. The main aim of using this process is to degrade the toxic complex structure of the pesticide to harmless products by treating the sample in the UV-reactor. The COD measurements are carried out in order to study the percentage mineralization and degradation is studied under d...
متن کاملSonosynthesis and Characterization of TiO2/ZrO2 Nanocomposite and Photocatalytic degradation of Congo red Dye under UV Light
NanoTiO2 , nanoZrO2 and TiO2 /ZrO2 nanocomposite were prepared via sol gel method by using ultrasonic irradiation. The precursor sol of zirconium was prepared from an aqueous solution of ZrCl4 and titanium tetra 2-propoxide was diluted by 2-propanol and deionized water The TiO2 /ZrO2 nanocomposite was synthesized from directly mixing Titanium dried gel into Zirconium gel. The reaction mixture w...
متن کاملPhotocatalytic Mineralization of Methylene BlueAqueous Solutions by Ag/TiO2 Nano Composite
Nanocomposite of Ag/TiO2 and nanocrystalline TiO2 were prepared by using TiCl4 as a precursor in a simple sol-gel process. The prepared photo-catalysts were characterized by X-ray diffraction (XRD), scanning electron micrographs (SEM), energy dispersive X-ray microanalysis (EDX), transmission electron microscopy (TEM) and diffuse reflectance spectroscopy (DRS). A complete and effective photocat...
متن کاملFabrication of UV/ TiO2 nanotubes / Pd system by electrochemical anodization for furfural photocatalytic degradation
The aim of this study was to degrade furfural by a new nanotube system. To degrade some organic pollutants as well as to reduce the amount of furfural which is a well-known pollutant in oil industry, the photocatalytic process along with ultraviolet (UV) irradiation may be employed. In this study, the UV/TiO2/Pd system in which the nanoparticles of palladium doped into the titanium dioxide was ...
متن کامل