Table 1.

First order photodegradation rate constants for triclosan, triclocarban, and 1,4-dioxane under UV exposure in the presence and/or absence of ZnO. Data obtained before 6 h were used for estimating the constant for triclosan, while data obtained before 12 h were used for triclocarban and 1,4-dioxane.

Chemicals		First order degradation rate constant, k (min−1)
Triclosan (TCS)	UV	0.024 ± 0.006 (R2 = 0.97)
	UV + T-ZnO (1 g/L)	0.296 ± 0.006 (R2 = 0.99)
Triclocarban (TCC)	UV	0.005 ± 0.000 (R2 = 0.35)
	UV + T-ZnO (1 g/L)	0.023 ± 0.000 (R2 = 0.98)
1,4-Dioxane	UV	0.043 ± 0.003 (R2 = 0.84)
	UV + C-ZnO (1 g/L)	0.456 ± 0.048 (R2 = 0.88)