Titanium Dioxide-Mediated Photcatalysed Degradation of Two Herbicide Derivatives Chloridazon and Metribuzin in Aqueous Suspensions

Table 1

(a) Comparison of degradation rate of CHL and MET in the presence of different types of TiO₂ samples. Experimental conditions: CHL (0.18 mM), MET (0.30 mM), 𝑉=125 mL, photocatalysts: Degussa P25 (1 gL⁻¹), Sachtleben Hombikat UV100 (1 gL⁻¹), PC500 (1 g⁻¹), irradiation time: 60 min (CHL), 28 min (MET). (b) Comparison of mineralization rate of CHL and MET in the presence of TiO₂ and TiO₂/H₂O₂. Experimental conditions: CHL (0.55 mM), MET (0.11 mM), 𝑉=125 mL, photocatalysts: Degussa P25 (1 gL⁻¹), irradiation time: 60 min (CHL), 28 min (MET).

	(a) Rate of photodegradation (mmol L^−1 min^−1)			(b) Rate of photomineralization (mmol L^−1 min^−1)
	P25	UV100	PC500	ℎ𝜈/P25	ℎ𝜈/P25/H2O2
Chloridazon	0.0021	0.0018	0.0011	0.0003	0.0022
Metribuzin	0.036	0.025	0.025	0.0003	0.0008