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Degradation Study of Benalaxyl Fungicide Residues in Different pH Waters Using Ferrous Doped Titanium Dioxide Nanoparticles

Nageswara Rao T, Benarji Patrudu T, Basaveswara Rao MV and Apparao K

Studied the dissipation behavior of benalaxyl beneath direct sunlight by using Fe doped TiO2 nanoparticles (FeTiO2) as catalyst. FeTiO2 nanoparticles are synthesized and characterized by way of Scanning Electron Microscopy (SEM) combined with Energy Dispersive X-ray evaluation (EDX) and Fourier Transform Infrared Spectroscopy (FT-IR). The photo catalytic studies were conducted by the 1 l of Milli-Q water, pH 4.0, 7.0 and 9.0 buffer were spiked with 1 mL of 1000 mg/L stock solution of benalaxyl 35% WP to get 1 μg/ml concentration of pesticide active in water. Three sets of such samples in triplicates were prepared and sonicated for 10 min to get homogeneous concentration of pesticide active in water and labeled as S1, S2, and S3. Two sets of samples (S1 and S2) were added FeTiO2 nanoparticles to get 0.06 g/L content of photo catalyst. S1 and S3 sets of samples were exposed to sun light. S2 set of samples were kept in an oven at 40°C in dark. The Milli-Q water spiked with stock solution of pesticide and without addition of FeTiO2 nanoparticles (S3) were also exposed to sun light for the measurement of photolytic degradation of pesticide in water. The FeTiO2 added Milli-Q water without spiking of pesticides (S4) was also maintained as untreated control for the identification of absence of pesticide. The collected samples were quantified using a validated HPLC-UV method. Kinetic parameters such as rate constant (k), DT50 and DT90 were calculated using the dissipation data of benalaxyl.