Photocatalytic degradation of pesticide residues with RE3+ -doped nano-TiO2

The photocatalytic degradation effects of carbofuran solution under concentration of 0.2, 0.4, 0.8 g/L Re³⁺-doped nano-TiO₂ were studied. The highest degradation rate of 54.89% was obtained after 4 h degradation when the concentration of nano-TiO₂ was 0.4 g/L. Then field trials of photocatalytic degradation with suspension nano-TiO₂ were conducted. The photocatalytic degradation effect of organic phosphorus and carbamate pesticides in tomato leaves and soil with different concentratio catalyst (0, 0.2, 0.4, 0.6, 0.8 g/L) were studied. The results showed that nano-TiO₂ could significantly increase photocatalytic degradation rate of pesticide residues in tomato leaves and soil. Pesticide residues degradation rate could be increased by 20%-30% on the tomato leaves and 15%-20% in soil, and the best concentration of photocatalytic degradation was 0.2-0.4 g/L.