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

• Published in: Scientific reports 2020-04, Vol.10 (1), p.6588-6588, Article 6588
• Main Authors: Wang, Wen, Zhang, Jing, Chen, Tianya, Sun, Jing, Ma, Xiulan, Wang, Yujun, Wang, Jihong, Xie, Zhonglei
• Format: Article
• Language: English
• Subjects: 639/301; 704/172; Catalysis; Charcoal; Enrofloxacin; Humanities and Social Sciences; Irradiation; multidisciplinary; Photocatalysis; Photodegradation; Science; Science (multidisciplinary); Surface area; Titanium dioxide; Ultraviolet radiation
• ISSN: 2045-2322; 2045-2322
• DOI: 10.1038/s41598-020-62791-5

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.