Effects of nitrite anions and ammonium cations on the photolysis of bisphenol S in nitrate solution

AbstractThe effects of nitrate ions on the photolysis of bisphenol S (BPS) under UV irradiation were studied using reaction kinetics. Based on this research, we investigated how nitrite anions and ammonium cations codissolved with nitrate affected the UV photolysis of BPS. The BPS photolysis fitted well to a first-order kinetic equation, and the half-life of BPS photolysis varied with changes in pH value, shortening from 95.0 min at pH 2 to 42.3 min at pH 10. Nitrate added to the BPS solution inhibited the BPS photolysis, but the extent of the inhibitory effect was associated with the pH value of the aqueous solution. The inhibiting ratio remained within 19.2–27.6% in acidic and neutral solutions, while it stayed at about 3.6% in alkaline solutions. Nitrite anions exhibited a strong inhibitory effect on BPS photolysis, but the inhibitory effect of coexistent in a BPS- solution was weaker than that of separate , indicating that the inhibitory effect of mixed form of and were not simply additive; some offse...