Journal
CHEMICAL ENGINEERING JOURNAL
Volume 384, Issue -, Pages -Publisher
ELSEVIER SCIENCE SA
DOI: 10.1016/j.cej.2019.123311
Keywords
Ball milling; Biochar; Photocatalytic degradation; Enrofloxacin
Categories
Funding
- National Natural Science Foundation of China [U1806216, 41807363]
- National Key R&D Program of China [2018YFC1802000]
- Key Laboratory of Original Agro-Environmental Pollution Prevention and Control
- Ministry of Agriculture/Tianjin Key Laboratory of Agro-environment and Safe product [18nybcdhj-1, 18nybcdhj-5]
- Hebei Outstanding Youth Science Foundation [D2019202453]
- 111 Program of the Ministry of Education of China [T2017002]
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Ball-milled biochar with enhanced physicochemical and sorption properties has been intensively investigated, but its photochemistry is far less studied. In this study, biochars produced at various pyrolysis temperatures were ball-milled and tested to determine enrofloxacin (EFA) photocatalytic degradation and its mechanisms. Ball-milled biochar could generate more center dot O-2(-) under visible light irradiation, which favored the photocatalytic degradation of EFA. The ball-milled biochar pyrolyzed at 300 degrees C (BM300) exhibited the highest EFA degradation rate (80.2% compared with 13.9% for unmilled biochar) and mineralization ability (66.4% compared with 0% for unmilled biochar). The characterization results suggested that more oxygen-containing functional groups played a significant role in the enhancement of photocatalytic performance. Based on the characterization and experiment results, it was supposed that a semiconductor-like structure played a main role in photocatalysis of BM300. A new mechanism suggested that the electrons in carbon defects (as valence band) could be excited by visible light and move to oxygen-containing functional groups (as conduction band), then the electrons in conduction band was further transferred to dissolved oxygen to produce center dot O-2(-), and h(+) could be formed in valence band at the same time. This work applied ball-milled biochar to the field of photocatalysis for the first time, and provided a new opportunity for the removal of EFA in aqueous solutions.
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