Degradation of CIP in mariculture wastewater by PTCN/CaO2/vis system: Mechanism and fate
ZENG Yu-feng, NIU Meng-yang, CHEN Ping, QIU Yan-nan, LIN Yi-jie, XIAO Zhen-jun, FANG Zheng, YU Zong-shun, LIN Zi-feng, LUO Jin, Lü Wen-ying, LIU Guo-guang
Guangdong-Hong Kong-Macao Joint Laboratory for Contaminants Exposure and Health, Guangdong Key Laboratory of Environmental Catalysis and Health Risk Control, School of Environmental Science and Engineering, Guangdong University of Technology, Guangzhou 510006, China
Abstract：Abuse of antibiotics presents a significant threat to both human health and environmental ecology. To combat this issue, a phosphorus-doped tubular carbon nitride (PTCN)/CaO2/visible light(vis) system would be developed and applied to effectively remove the pollutant ciprofloxacin (CIP) from mariculture wastewater. Meanwhile, the reaction mechanism of this system and the environmental fate of the antibiotic CIP would be investigated in this work. Experimental results indicated that the PTCN/CaO2/vis system exhibited excellent potential for degradation of antibiotics. The observed apparent degradation rate constant (kobs) of CIP under the experimental conditions was 7.15×10-2min-1. Single-factor experiments had revealed that the system exhibited enhanced CIP degradation efficiency in acidic conditions. However, the presence of co-existing factors in water did influence the system's ability to degrade CIP. Moreover, as the concentration of CIP increases, the system's capacity to degrade pollutant decreases. Additionally, the system displayed superior recyclability, maintaining a degradation rate of 82.5% after five cycles of PTCN. The process of CIP degradation by the system was primarily dominated by the active ingredient O2·-, while the active substances 1O2 and h+ also contributed to the process. As the target pollutant CIP underwent decarboxylation and piperazine epoxidation, a majority of the intermediate products produced were found to be more environmentally friendly towards aquatic organisms. Finally, by prolonging the system's degradation time, the antibacterial activity of CIP could be effectively eliminated.
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