Journal
JOURNAL OF CHEMICAL TECHNOLOGY AND BIOTECHNOLOGY
Volume 97, Issue 9, Pages 2547-2556Publisher
WILEY
DOI: 10.1002/jctb.7127
Keywords
photocatalysis; biodegradation; 2; 4; 6-trichlorophenol; sponge; degradation mechanism
Categories
Funding
- National Natural Science Foundation of China (NSFC) [21968005, 31860193]
- Guangxi Science and Technology Base and Special Talents [GXSTAD19110156]
- Guangxi Major Projects of Science and Technology [GXMPSTAA17129001, GXMPSTAA18118013, GXMPSTAA17202032]
- Guangxi Ba-Gui Scholars Program
- Foundation of Guangxi Key Laboratory of Clean Pulp & Papermaking and Pollution Control [ZR201702]
- National Key R&D Program of China [2018YFD0800700]
- Opening Project of National Enterprise Technology Center of Guangxi Bossco Environmental Protection Technology Co. Ltd, China
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This study introduces a new bio-photocatalytic degradation system and provides insight into the mechanism of chlorophenol-contaminated wastewater treatment using ICPB.
BACKGROUND Intimately coupled photocatalysis and biodegradation (ICPB) is a novel wastewater treatment technology with potential applications in the degradation of bio-recalcitrant compounds. Although visible light has some advantages over UV light in the ICPB technology, it has never been used to treat 2,4,6-trichlorophenol (2,4,6-TCP)-contaminated wastewater with this approach. RESULTS TiO2/sponge composites with good photocatalytic activity under visible light were prepared and used as biofilm supports to develop a novel ICPB system. The latter showed highly efficient degradation properties and could mineralize 2,4,6-TCP, with performances superior to those of the individual biological and photocatalytic systems. The removal of 2,4,6-TCP using the ICPB system reached almost 100% after 4 h, whereas the mineralization rate approached 83% after 12 h. The key feature of the presented ICPB method is that photocatalytic reactions can occur after detachment of biofilms from the outer surface of the composite, and the resulting photocatalytic products are biodegraded by the protected biofilms inside the composites. The interior of the composites exhibited a marked enrichment in Acinetobacter, Methylophilus, Pseudomonas, Acidovorax and Flavobacterium species, which played an important role in the ICPB system. CONCLUSIONS This study introduces a new bio-photocatalytic degradation system and provides insight into the mechanism of chlorophenol-contaminated wastewater treatment using ICPB. (c) 2022 Society of Chemical Industry (SCI).
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