UV/TiO2 photodegradation of metronidazole,ciprofloxacin and sulfamethoxazole in aqueous solution: An optimization and kinetic study |
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Affiliation: | 1. Bangladesh Council of Scientific and Industrial Research (BCSIR), Dhaka, Bangladesh;2. Department of Materials and Metallurgical Engineering, Bangladesh University of Engineering & Technology, Dhaka, Bangladesh;3. Department of Chemical Engineering, Bangladesh University of Engineering & Technology, Dhaka, Bangladesh |
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Abstract: | Emerging pharmaceutical ingredients (APIs) like sulfamethoxazole (SMX), metronidazole (MNZ) and ciprofloxacin (CIP) are biopersistent and toxic to the environment and public health. In this study, UV/TiO2 photodegradation was applied in the degradation of SMX, MNZ and CIP individually and in a mixture. For a 5 mg/L SMX solution, about 97% of SMX was degraded within 360 min, which was reduced to 80% for 80 mg/L of SMX solution at the same TiO2 dosage and photodegradation time. The maximum removals of MNZ and CIP as individual components were 100% and 89%, respectively at 600 min of photodegradation reaction time. For binary mixtures, the highest removal (100%) was achieved for MNZ and CIP ([MNZ] = [CIP] = 40 mg/L) mixture at 120 min whereas the degradations were 97% and 96% for SMX and MNZ, and SMX and CIP binary mixtures, respectively, even after 600 min of experimental time at the same concentrations. For tertiary mixture, the maximum degradation 99% was observed for (SMX = CIP] = 20 mg/L and [MNZ] = [40 mg/L) at 600 min. The observed reaction rate was 0.01085 min?1 when SMX concentration was 5 mg/L, which decreased to 0.00501 min?1 for SMX concentration of 80 mg/L, indicating decreasing of reaction rate at higher concentration. The results indicate that the UV/TiO2 process is promising to apply for the treatment of pharmaceutical wastewaters. |
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Keywords: | Ciprofloxacin Degradation kinetics Metronidazole Sulfamethoxazole Photodegradation SMX" },{" #name" :" keyword" ," $" :{" id" :" pc_t1ykbEGZqE" }," $$" :[{" #name" :" text" ," _" :" Sulfamethoxazole MNZ" },{" #name" :" keyword" ," $" :{" id" :" pc_NLQyslxJec" }," $$" :[{" #name" :" text" ," _" :" Metronidazole CIP" },{" #name" :" keyword" ," $" :{" id" :" pc_1NPzmgmKFl" }," $$" :[{" #name" :" text" ," _" :" Ciprofloxacin AOP" },{" #name" :" keyword" ," $" :{" id" :" pc_ItzNE1LK7Q" }," $$" :[{" #name" :" text" ," _" :" Advanced oxidization process LC-MS" },{" #name" :" keyword" ," $" :{" id" :" pc_aOFN7rmLdR" }," $$" :[{" #name" :" text" ," _" :" Liquid chromatography mass spectrometry |
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