Abstract
The photodegradation of β-lactam antibiotics such as amoxicillin (AMO), ampicillin (AMP), penicillin G (PEG), penicillin V (PEV), and cloxacillin (CLX) is studied in the presence of ZnS nanoparticles as photocatalyst. The ZnS nanoparticles are prepared by controlled precipitation method and characterized by transmission electron microscopy image. The optimized conditions for degradation of β-lactam antibiotics are pH 4.5 and 0.5 mg L-1 of catalyst. The degradation rate of β-lactam antibiotics is in order of: CLX > PEG > PEV > AMP > AMO, that is mutual agreement with order of β-lactam Antibiotics instability. The photodegradation rate of CLX, PEG, PEV, AMP, and AMO are obtained 5.51 × 10–2, 3.23 × 10–2, 2.85 × 10–2, 1.70 × 10–2 and 1.45 × 10-2 min-1, respectively, at initial concentration of 50 mg L-1. The oxidation of antibiotics molecules is confirmed with decreasing of chemical oxygen demand (COD) values of β-lactam solutions. The proposed method is used for degradation of high amounts of β-lactam antibiotics (1,000 mg L-1) in real samples.
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