Oxidation of Sulfonamides in Aqueous Solution by UV-TiO₂-Fe(VI)

Figure 3

The removal of different sulfonamides by UV-TiO₂-Fe(VI) ((a) sulfadiazine; (b) sulfamerazine; (c) sulfamethoxazole, [sulfadiazine]₀ = 0.02 mmol l⁻¹, [sulfamerazine]₀ = 0.02 mmol l⁻¹, [sulfamethoxazole]₀ = 0.02 mmol l⁻¹, [Fe(VI)]₀ = 0.05 mmol l⁻¹, pH 7, [TiO₂] = 500 mg l⁻¹, and light intensity = 0.15 mW cm⁻²).

(a)

(b)

(c)