ENHANCEMENT OF SYNERGISTIC EFFECT PHOTOCATALYTIC/PERSULFATE ACTIVATION FOR DEGRADATION OF AGRO PESTICIDES RESIDUES BY TERNARY NANOCOMPOSITE ZnO/TiO2/MgO

Abstract

In this study we present a method to synthesize new heterogenous photocatalytic materials based on ternary nanocomposite ZnO/MgO/TiO2 to activate persulphate
(K2S2O8) for degradation of methylen blue dye (MB) and pesticide acetamiprid that used in aquaculture and agricultural cultivation under simulated sunlight.
Photocatalytic composite samples with nano nanostructures were synthesized by hydrothermal method in an alkaline medium and characterized by X-ray diffraction
(XRD), Electron absorption spectrum (UV-Vis), N2 absorption/desorpions (BET), High-resolution Transmission Electron Microscopy (TEM), Fourier Transform Infrared
Spectroscopy (FTIR), Energy Dispersive X-ray Spectroscopy (EDX), Zeta potential measurement, Differential thermogravimetric method (TG-DTA), Decomposition activity
of Methylen Blue and pesticides Acetamiprid over multi-oxides composite under simulated sunlight when used separatetly and in combination with persulfate (K2S2O8),
with photocatalyst dose of 100 mg/L, irradaried intensity of 800µW/cm2
, has been investigated over reaction time. The synergistic photocatalytic activation properties
of persulfate by ZnO/TiO2/MgO material to decompose the pesticides and dye in aqueous solution also were investigated. The results showed that the composite
photocatalytic material has shown excellent synergistic properties of the heterogeneous photocatalyst ZnO/TiO2/MgO-persulfate system in enhancing the decomposition
of Methylen Blue and Acetamiprid residues in the water solution. The research results also show that the photocatalytic material ZnO/TiO2/MgO- persulfate system has
potential for practical application to control diseases and treat contaminated environments in aquaculture and organic agricultural crop cultivation.