Effects of ball milling on the photochemistry of biochar: Enrofloxacin degradation and possible mechanisms
By Yao Xiao, H. Lyu, Jingchun Tang, Kun Wang, Hongwen Sun. 2020
167 citations recorded by the source corpus.
Abstract 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 O2− under visible light irradiation, which favored the photocatalytic degradation of EFA. The ball-milled biochar pyrolyzed at 300 °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 O2−, 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.
Subfields: Renewable Energy, Sustainability and the Environment, Water Science and Technology
View Paper: https://www.semanticscholar.org/paper/334bbe6027e2f423fc93f5f6e3d80d5abe4a63ad
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In Renewable Energy, Sustainability and the Environment
In Water Science and Technology
Citations in the corpus
- Efficient elimination of organic and inorganic pollutants by biochar and biochar-based materials (2020, background): “The electrons in carbon defects (as valence band) could be excited by visible light and move to oxygencontaining functional groups (as conduction band), then the electrons in conduction band were transferred to dissolved oxygen to generate ·O2 and then H+ was formed in valence band (Xiao et al. 2020”