Abstract
Degradation of amoxicillin, ampicillin and cloxacillin antibiotics in aqueous solution by TiO 2 photocatalysis under UVA (365 nm) irradiation was studied. Enhancement of photocatalysis by addition of H 2O 2 was also evaluated. The results showed that no significant degradation occurred by 300-min UVA irradiation per se and pH had a great effect on antibiotic degradation. Photocatalytic reactions approximately followed a pseudo-first order kinetics and the rate constants ( k) were 0.007, 0.003 and 0.029 min − 1 for amoxicillin, ampicillin and cloxacillin, respectively. Addition of H 2O 2 at ambient pH ∼ 5 and TiO 2 1.0 g/L resulted in complete degradation of amoxicillin, ampicillin and cloxacillin in 30 min. Dissolved organic carbon (DOC) removal, and nitrate (NO 3 −), ammonia (NH 3) and sulphate (SO 4 2−) formation during degradation indicated mineralization of organic carbon, nitrogen and sulphur. UV/H 2O 2/TiO 2 photocatalysis is effective for degradation of amoxicillin, ampicillin and cloxacillin in aqueous solution.
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