Journal
JOURNAL OF HAZARDOUS MATERIALS
Volume 410, Issue -, Pages -Publisher
ELSEVIER
DOI: 10.1016/j.jhazmat.2020.124545
Keywords
Bromate; Bromide; Catalytic ozonation; Lattice oxygen; Manganese oxyhydroxide
Categories
Funding
- National Natural Science Foundation of China [51578556, 21673086, 41603097, 21876212]
- Natural Science Foundation of Guangdong Province [2015A030308005, S2013010012927, S2011010003416]
- Science and Technology Research Programs of Guangdong Province [2014A020216009]
- Startup Funds for HighLevel Talents of Sun Yatsen University [3800018821111]
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In this study, high-mobility lattice oxygen-rich MnOOH nanorods were successfully synthesized and used to inhibit bromate formation during catalytic ozonation in wastewater treatment. The MnOOH nanorods exhibited excellent performance in bromate control and simultaneous degradation of 4-nitrophenol. The effective decomposition of ozone and reduction of bromate into bromide by lattice oxygen-rich MnOOH were the key mechanisms contributing to the inhibition of bromate formation.
The inhibition of bromate formation is a challenge for the application of ozonation in water treatment due to the carcinogenicity and nephrotoxicity of bromate. In this study, the high-mobility lattice oxygen-rich MnOOH nanorods were synthesized successfully and applied for the bromate inhibition during catalytic ozonation in bromide and organic pollutants-containing wastewater treatment. The catalytic ozonation system using lattice oxygen-rich MnOOH nanorods exhibited an excellent performance in bromate control with an inhibition efficiency of 54.1% compared with the sole ozonation process. Furthermore, with the coexistence of 4-nitrophenol, the catalytic ozonation process using lattice oxygen-rich MnOOH nanorods could inhibit the bromate formation and boost the degradation of 4-nitrophenol simultaneously. Based on the experiments of ozone decomposition, surface manganese inactivation and reactive oxygen species detection, the inhibition of bromate could be attributed to the effective decomposition of ozone with generating more ?O2- and the reduction of bromate into bromide by lattice oxygen-rich MnOOH. The existed surface Mn(IV) on lattice oxygen-rich MnOOH can accept electrons from lattice oxygen and ?O2- to generate surface transient Mn(II)/Mn(III), in which Mn(II)/Mn(III) can promote the reduction of bromate into bromide during catalytic ozonation. This study provides a promising strategy for the development of bromate-controlling technologies in water treatment.
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