Photodegradation of Sulfadiazine in Aqueous Solution and the Affecting Factors

Table 1

First-order kinetic constants of sulfadiazine photodegradation in ultrapure water irradiated by UV light of 365 nm and 300 W with air pumping in (except the condition of N₂ instead) under various conditions.

Condition
Without addition (only sulfadiazine in H2O)	0.071	0.98
Plus 1% (V : V) ethanol	0.009	1.00
With nitrogen instead of air	0.045	1.00
Plus 43.8 mg⋅L^−1 H2O2	0.13	1.00
Plus 0.05 mM	0.034	0.84
Plus 0.5 mM	0.1	0.95
Plus 1 mM	0.054	0.95
Plus 5 mM	0.057	0.96
Plus 0.5 mM	0.017	0.89
Plus 2.4 mM	0.042	0.93
Plus 11.9 mM	0.046	0.96
At pH 4.52	0.046	0.91
At pH 6.98	0.065	0.98
At pH 8.20	0.057	0.94