No abstract

Fe–Ag co-doped TiO2 nanoparticles (NPs) were prepared as a photocatalyst using a precipitation method for the removal of flumioxazin pesticide residues in water. The analytical method was validated with specificity, linearity, recovery, precision, the limit of quantification, and detection limit. Linearity was determined by different known concentrations of standard solutions. Detection limit was identified as the lowest concentration resulting in a 3-fold response to baseline noise. Photolytic and photocatalytic studies were conducted in borosil glass bottles under sunlight at a single fortification level (1.0 μg/mL) in Milli-Q water with various pH values (pH 4.0, 7.0, and 9.0). The optimum catalyst concentration recommended for complete degradation was found to be 50 mg/L under sunlight. The HPLC-UV method was used to determine flumioxazin residues in water, and the rate constant, DT50, and DT90 values were calculated from the data obtained. The photolytic results do not indicate a significant residue loss due to adsorption. Fe–Ag co-doped TiO2 NPs are an outstanding decontaminating catalyst in various water samples.

Nanocrystalline TiO 2 was synthesized using the microwave plasma technique and characterized using X-ray diffraction, transmission electron microscopy, scanning electron microscopy, laser particle size analyzer, UV-vis spectroscopy and BET surface area analyzer. The synthesized TiO 2 powder crystallized in anatase phase and the crystallite sizes were in nanometers. The photocatalytic activity of the compound was determined and compared against the activity of the commercial Degussa P-25 TiO 2 catalyst. The degradation rates of the dyes were found to be higher over the synthesized TiO 2 as compared to that over commercial Degussa P-25 TiO 2 .

Nano-crystalline titanium nitride was prepared by the microwave plasma synthesis technique by optimizing microwave process parameters such as power, gas flow rate and pressure based on the stable plasma. Synthesized nanocrystalline titanium nitride was characterized to determine the structural properties such as nanocrystallinity, particle size, morphology, surface area and chemical elemental analysis using X-ray diffraction, transmission electron microscopy, scanning electron microscopy, micromeritics ASAP 2020 and X-ray photoelectron spectroscopy respectively. The results showed that synthesized titanium nitride nano-powders were crystalline, spherical in shape, the size in the range of 20-100 nm, the surface area of the nanocrystalline to be 49 m 2 /g and good functional properties with 90-98% purity.