Photodegradation mechanism of metronidazole on nanostructured material type SBA-15/TiO2

被引:8
作者
Sales, Gabriel S. [1 ,2 ]
Fransa, Aline A. C. [1 ]
Cruz-Filho, Joao F. [1 ,2 ]
Moraes, Carlos A. F. [3 ]
Neto, Antonio R. Silva [3 ]
Sales, Ana G. C. [1 ,2 ]
Santos, Reginaldo S. [1 ,2 ]
Luz Jr, Geraldo E. [1 ,2 ]
机构
[1] Fed Univ Piaui UFPI, PPGQ Dept Chem, BR-64049550 Teresina, PI, Brazil
[2] SGrEEnTeC PPGQ tate Univ Piaui UESPI, 2231 Joao Cabral St,POB 381, BR-64002150 Teresina, PI, Brazil
[3] Fed Univ Sao Carlos UFSCar, Dept Chem, PPGQ, BR-13565905 Sao Carlos, SP, Brazil
来源
JOURNAL OF ENVIRONMENTAL CHEMICAL ENGINEERING | 2023年 / 11卷 / 05期
关键词
Advanced oxidative processes; Emerging pollutants; Wastewater treatment; Heterogeneous photocatalysis; Photobleaching mechanism; NANO TITANIA PARTICLES; WATER-TREATMENT-PLANT; MESOPOROUS SILICA; ANAEROBIC REACTOR; ANATASE TIO2; DEGRADATION; EFFICIENCY; AMOXICILLIN; INTENSITY; OXIDATION;
D O I
10.1016/j.jece.2023.110335
中图分类号
X [环境科学、安全科学];
学科分类号
08 ; 0830 ;
摘要
The water quality to supply the human population has been a growing concern throughout the planet, as well as wastewater treatment. In this context, the photodegradation of the antibiotic metronidazole (MTZ) in aqueous solution was evaluated on nanostructured SBA-15/TiO2 under UV irradiation. The structural and optical characterization of SBA-15/TiO2 indicated the formation of a structure similar to the SBA-15 molecular sieve with band gap energy (Eg) equal to 3.23 eV. The photodegradation of MTZ on SBA-15/TiO2 indicated that the con-centration was reduced by 87.70 % after 200 min of irradiation, with 75.52 % of degradation after the third reuse cycle. Comparatively, the photodegradation rate was 63.39 % and 56.7 % for commercial TiO2 (P25) and synthesized TiO2 (NP-TiO2), respectively. The effect of radical scavengers at 10-4 mol L-1 concentration demonstrated that inhibition of radicals O2 center dot- and center dot OH reduces photodegradation by 76.73 % and 86.13 %, respectively. The photodegradation byproducts analysis by LC-MS indicated that the photodegradation of MTZ begins by oxidation of C-OH by radical O2 center dot- and hydroxylation of the imidazole ring. Through chemical actinometry was obtained 10.6 % of the radiation emitted by UV lamps in the photodegradation process. Furthermore, the degradation of MTZ on SBA-15/TiO2 had a cost-effective $ 21.05 m-3 and was better than that of the other powders studied in this work.
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页数:13
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