Efficient photo-Fenton-like degradation of tetracycline hydrochloride using Co-In2O3 nanotubes: Insights into mechanism and performance
Photo-Fenton-like process is effective towards refractory organics removal for its strong oxidation capacity. Herein, cobalt-doped indium oxide (Co-In 2 O 3 ) with nanotube morphology was prepared and was taken as photo-Fenton-like catalyst. In the presence of peroxymonosulfate (PMS), Co-In 2 O 3 nanotubes exhibited excellent photo-Fenton-like activity with tetracycline hydrochloride (TC-HCl) degradation of 98.8 % in 40 min. The visible light driving Co-In 2 O 3 /PMS system showed the reaction rate constants of 0.0998 min −1 , which was 6 folds of the In 2 O 3 /PMS/vis system. Experimental results combining with theoretical chemical calculation demonstrated that the doping of Co can effectively reduce the band gap of In 2 O 3 , thus leading to stronger visible light absorption capability. The presence of oxygen vacancies (OVs) disrupted the symmetry and integrity of the catalyst structure and achieved electron enrichment at the reactive site. Simultaneously, Co doping and an appropriate amount of OVs strengthened chemisorption for PMS (from −0.652 eV to −4.224 eV) and higher electron density difference (from 0.49 e – to 0.68 e − ). Our findings provide insight on the contribution role of cobalt doping and OVs in improving photo-Fenton-like catalytic efficiency.
危险品化学品经营许可证（带存储）