Photocatalytic Degradation of Atenolol by TiO2 Irradiated with an Ultraviolet Light Emitting Diode: Performance, Kinetics, and Mechanism Insights

Catalysts

Shaofeng Li¹  Zhilin Ran²  Liping Wang³  Yuanhang Fang⁴  Cong Ma⁵ 

[1] Department of Building and Environmental Engineering, Shenzhen Polytechnic, Shenzhen 518055, China;Institute of Innovational Education Research, School of Transportation and Environment, Shenzhen Institute of Information Technology, Shenzhen 518172, China;School of Environmental Science and Engineering, Chang’an University, Xi’an 710064, China;Shenzhen Water Affairs (Group) Co. Ltd., Shenzhen 518033, China;State Key Laboratory of Separation Membranes and Membrane Processes, School of Environmental Science and engineering, Tiangong University, Tianjin 300387, China;

关键词: ultraviolet light emitting diode;    advanced oxidation process;    nano titanium dioxide;    photocatalysis;    hydroxyl radical;    atenolol;   

DOI  :  10.3390/catal9110876

来源: DOAJ

【 摘 要 】

Batch experiments were performed to investigate the effect of several environmental factors on atenolol (ATL) degradation efficiency, including catalyst crystal phase (anatase TiO₂, rutile TiO₂, and mixed phase), catalyst dosage, UV-LED wavelength and intensity, co-existing anions, cations, and pH. The mixed phase (2 g/L) exhibited the best photocatalytic activity at 365 nm, with ATL (18.77 µM) completely oxidized within 1 h. These results suggest that: (i) The mixed phase exhibits the highest activity due to its large specific surface area and excellent charge separation efficiency. (ii) ATL can be effectively degraded using mixed phase TiO₂ combined with UV-LED technology and the ATL degradation efficiency could reach 100% for 60 min; (iii) ATL photodegradation was more effective under 365 nm UV-LED than 254 nm, which was caused by the effect of light-induced charge separation; (iv) the ATL Degradation efficiency(De) decreased with an increase in initial ATL concentrations; and (v) co-existing anions and cations had different effects on the ATL De, mainly by changing the concentration of hydroxyl radicals. Considering that UV-LED is more energy-saving and environmentally friendly, and commercial TiO₂ is cheap and easy to obtain, our research provides feasibility for practical application.

【 授权许可】

Unknown