期刊
APPLIED CATALYSIS B-ENVIRONMENTAL
卷 238, 期 -, 页码 70-81出版社
ELSEVIER
DOI: 10.1016/j.apcatb.2018.07.003
关键词
Ilmenite; Persulfate; Bacterial inactivation; Photocatalysis; Visible light
资金
- Research Grant Council, Hong Kong SAR Government [GRF14100115]
- Technology and Business Development Fund of The Chinese University of Hong Kong [TBF15SCI008]
- National Science Foundation of China [51578556, 21673086, 41603097]
- CAS/SAFEA International Partnership Program for Creative Research Teams of Chinese Academy of Sciences [2015HSC-UE004]
- Start-up Funds for High-Level Talents of Sun Yat-sen University [38000-18821111]
In this study, a natural occurring ilmenite was successfully developed as an efficient catalyst/photocatalyst for bacterial inactivation coupling with persulfate (PS) under visible light (Vis) irradiation. The excellent bacterial inactivation is demonstrated by the result that the bactericidal efficiency in the ilmenite/PS/Vis process reached 6 log(10) cfu/mL within 30 min as compared to that of 1.5 log(10) cfu/mL for the ilmenite/Vis process and 4 log(10) cfu/mL for the ilmenite/PS under same conditions. Integrated with the electron paramagnetic resonance analysis, electrochemical measurements and photoluminescence spectroscopic analysis, the enhanced performance was attributed to the accelerated capture of photo-generated electrons by PS and Fe(II) of ilmenite promoted PS activation vice versa to collectively generate more radicals for E. coli inactivation in the ilmenite/PS/Vis process. For the first time, the generation of singlet oxygen (O-1(2)) was proved to be the primary bactericidal agent other than center dot SO4- and center dot O-2(-), which caused leakage and mineralization of E. coli intracellular components. Impressively, the O-1(2)-mediated ilmenite/PS/Vis system showed good inactivation performance in authentic water body and maintained good reusability in the pilot-scale 25 L reactor. This work highlights the great potential of natural ilmenite as catalyst and elucidated a new opportunity for persulfate remediation of controlling microbial water contaminants.
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