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Preparation of TiO2-modified Biochar and its Characteristics of Photo-catalysis Degradation for Enrofloxacin

Wen WangCollege of Resources and Environment, Jilin Agricultural University, Changchun, Jilin Province, 130118, People's Republic of ChinaJing ZhangCollege of Resources and Environment, Jilin Agricultural University, Changchun, Jilin Province, 130118, People's Republic of ChinaTianya ChenCollege of Resources and Environment, Jilin Agricultural University, Changchun, Jilin Province, 130118, People's Republic of ChinaJing SunCollege of Resources and Environment, Jilin Agricultural University, Changchun, Jilin Province, 130118, People's Republic of ChinaXiulan MaCollege of Resources and Environment, Jilin Agricultural University, Changchun, Jilin Province, 130118, People's Republic of China. [email protected]Yujun WangCollege of Resources and Environment, Jilin Agricultural University, Changchun, Jilin Province, 130118, People's Republic of ChinaJihong WangCollege of Resources and Environment, Jilin Agricultural University, Changchun, Jilin Province, 130118, People's Republic of ChinaZhonglei XieCollege of Construction Engineering, Changchun Sci-Tech University, Changchun, Jilin Province, 130600, People's Republic of China. [email protected]

2020en

ABI

Annotatsiya

Abstract In order to solve the problem that the traditional biochar(BC) has insufficient removal ability of enrofloxacin and TiO 2 is difficult to recycle. In this study, TiO 2 -modified biochar composites were prepared by impregnation method. Through characterization analysis, The BET specific surface area results indicated that after loading TiO 2 , the specific surface area of TiO 2 -biochar(Ti-BC), TiO 2 -ironized biochar(Ti-FBC) and TiO 2 -alkaline biochar(Ti-KBC) increased by 4.34, 10.43 and 11.52 times, respectively. The analysis results of SEM, EDS, FT-IR, XRD and XPS showed that TiO 2 was supported on biochar in the anatase state. The UV-vis DRS measurement showed that the band width of Ti-KBC was the smallest and the best catalytic activity. Under 15 W UV lamp (254 nm) irradiation, the photocatalytic degradation process of enrofloxacin by different biochar accords with the first-order kinetic equation. Ti-KBC showed best degradation effect under different initial concentrations of enrofloxacin. When the pH of the solution was 5.0 and the dosage of Ti-KBC was at 2.5 g·L −1 , the enrofloxacin degradation rate of 100 mg·L −1 reached 85.25%. The quenching test confirmed that the active substance O 2 • — played a major role in the photocatalytic degradation process. After five cycles of the test, the degradation rate of Ti-KBC for enrofloxacin was 77.14%, which was still better than that of BC, Ti-BC and Ti-FBC.

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DOI: 10.1038/s41598-020-62791-5

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