期刊
FRONTIERS IN BIOENGINEERING AND BIOTECHNOLOGY
卷 8, 期 -, 页码 -出版社
FRONTIERS MEDIA SA
DOI: 10.3389/fbioe.2020.616780
关键词
photocatalytic degradation; BPA; porous ZnO; kinetics; mechanisms
资金
- Key-Area Research and Development Program of Guangdong Province [2019B110209003]
- National Natural Science Foundation of China [21776324, 22078374]
- National Key R&D Program of China [2018YFD0800700]
- National Ten Thousand Talent Plan
- Guangdong Basic and Applied Basic Research Foundation [2019A1515011603, 2019B1515120058, 2020A1515011149]
- Guangdong Provincial Key Laboratory of Environmental Pollution Control and Remediation Technology, China [2018K02]
- Fundamental Research Funds for the Central Universities [19lgzd25]
- Hundred Talent Plan from Sun Yat-sen University [201602]
A porous ZnO photocatalyst was developed for efficient degradation of BPA, achieving 99% degradation in 1 hour under specific conditions. Various factors influencing the degradation performance were studied, and the main pathways of BPA degradation were proposed based on ten intermediates found in the process.
Bisphenol A (BPA) produced from biomass is a typical endocrine disrupting compound that is carcinogenic and genotoxic and can be accumulated in water due to its extensive use and difficult degradation. In this study, the porous ZnO photocatalyst with core-shell structure and large surface area was successfully developed for the efficient photocatalytic degradation of BPA. The various effects of calcination temperatures, BPA concentrations, ZnO dosages, pH and inorganic ions on the degradation performance were systemically studied. The results showed that 99% degradation of BPA was achieved in 1 h using the porous ZnO calcined at 550 degrees C under the conditions of 30 mg/L BPA, 1 g/L ZnO, and pH of 6.5. Besides, the inhibition effects of anions for the photocatalytic removal of BPA decreased in the order of H2PO4- > HCO3- > SO42- > Cl-, while the cations K+, Ca2+, and Na+ had little effect on the photocatalytic degradation of BPA. The results of scavenging experiments showed that h(+), center dot O-2(-), and e(-) played the key role in the photocatalytic degradation process. Finally, the main pathways of BPA degradation were proposed based on ten intermediates found in the degradation process. This work may provide a good guideline to degrade various endocrine disrupting compounds in wastewater treatment.
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