Journal
CHEMOSPHERE
Volume 284, Issue -, Pages -Publisher
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.chemosphere.2021.131337
Keywords
Photocatalyst; Reclaimable; Hydrogen peroxide; Cephalexin; Energy consumption
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In this study, a new photocatalyst was developed by coupling wasted sediment with titanium isopropoxide, which effectively decomposed cephalexin with a destruction rate of 87.01%. The system, activated by ultrasonic and UV radiation, showed promising results for cephalexin removal in water solutions.
In this study, wasted sediment (sludge waste from shipping docks) was coupled with titanium isopropoxide by the thermal and sol-gel method as a new photocatalyst. The sediment-titanate catalyst alongside ultrasonic and UV was activated hydrogen peroxide to produce OH radicals and decompose cephalexin (CEP). The photocatalyst was crystalline with 52.29 m(2)/g BET area. The best destruction rate of 87.01% based on COD test was achieved at optimal conditions (pH: 8, cephalexin concentration: 100 mg/L, H2O2: 1.63 mg/L, UV: 15 W/m(2), ultrasonication time: 100 min at 40 kHz, photocatalyst quantity: 1.5 g/L). The trend of anions effect was NO3- <= SO42- <= Cl-. Decomposition of cephalexin in water solution followed the first-order kinetics (k > 0.01 min(-1), R-2 > 0.9). The percentage of cephalexin removal from urban water (76%) and hospital wastewater (63%) has decreased compared to the distilled water solution (87%), which is probably due to the presence of radical inhibitors. The consumed electrical energy of the studied system was calculated by 0.031 kW/h. The developed system is a promising and economical method to remove cephalexin.
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