PHOTOCATALYTIC DEGRADATION KINETICS OF PESTICIDE RESIDUES IN DIFFERENT pH WATERS USING METAL-DOPED METAL OXIDE NANOPARTICLES

Abstract

We report the dissipation behavior of pyrazosulfuron-ethyl under direct sunlight using iron-doped titanium dioxide nanoparticles (FeTiO2) as a catalyst. The test was carried out by reinforcement three varying aqueous pH solutions with pH~4.0,7.0 and 9.0 to make the homogeneous concentrations of T0 – untreated control, T1 – pyrazosulfuron-ethyl 70% WG @ 1 mg/L of pH water and T2 – pyrazosulfuron-ethyl 70% WG @ 2 mg/L of pH water. The fortified test samples were exposed to sunlight. The sampling occasions were 0, 1, 5, 10, 24, 48, 72 and 96th hours for all three different aqueous solutions having pH ~ 4.0 (acidic water), 7.0 (neutral water) and 9.0 (basic water). The acquired samples were quantified using validated high-pressure liquid chromatography with UV detection technique. The pyrazosulfuron-ethyl half-life (DT50) was calculated from the dissipation results by regression equation. The FeTiO2 nanoparticles were determined to be a wonderful decontaminating catalyst for pyrazosulfuron-ethyl in various water samples.