Photocatalytic Degradation of Diazinon in Aqueous Solutions Using Immobilized Mgo Nanoparticles on Concrete Publisher



Ahmadifard T¹ ; Heydari R² ; Tarrahi MJ³ ; Khorramabadi GS¹ Show Affiliations
Source: International Journal of Chemical Reactor Engineering Published:2019

Abstract

Photocatalytic degradation of diazinon in the aqueous solution using UV light and MgO nanoparticle (NPs) immobilized on the concrete was investigated. Prepared catalyst was characterized using TEM, XRD, SEM, and EDX techniques. The results showed that the average particle size of immobilized MgO NPs was 38.3nm and NPs appropriately was coated on the concrete surface. The performance of degradation and mineralization of diazinon was evaluated by HPLC and TOC techniques, respectively. The effect of operational parameters including pH value, initial pesticide concentration, and contact time were studied on the removal and mineralization of diazinon by a photocatalytic process. The results showed that the MgO NPs and UV light had little effect in removing pesticide when used individually. On the other hand, diazinon can be effectively degraded by immobilized MgO NPs in the presence of UV light. Degradation products of diazinon using the proposed photocatalytic technique were identified by the GC-MS analysis. The maximum diazinon removal (99.46%) was obtained under the conditions; pH 7, diazinon concentration of 5mg/L, and contact time of 120minutes. Also, the lowest energy consumption conditions were as follow; pH 7, diazinon concentration of 5mg/L, and contact time of 30minutes. © 2019 Walter de Gruyter GmbH, Berlin/Boston.