Efficient catalytic activity and bromate minimization over lattice oxygen-rich MnOOH nanorods in catalytic ozonation of bromide-containing organic pollutants: Lattice oxygen-directed redox cycle and bromate reduction

• Published in: Journal of hazardous materials 2021-05, Vol.410, p.124545, Article 124545
• Main Authors: Huang, Yajing, Luo, Manhui, Li, Shuzhen, Xia, Dehua, Tang, Zhuoyun, Hu, Shaoyun, Ye, Siting, Sun, Mingjie, He, Chun, Shu, Dong
• Format: Article
• Language: English
• Subjects: Bromate; Bromide; Catalytic ozonation; Lattice oxygen; Manganese oxyhydroxide
• ISSN: 0304-3894; 1873-3336
• DOI: 10.1016/j.jhazmat.2020.124545

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. [Display omitted] •High-mobility lattice oxygen-rich MnOOH nanorods were fabricated.•BrO3- was efficiently inhibited in MnOOH catalytic ozonation process.•·O2- radicals are the main ROS in MnOOH catalytic ozonation to promote O3 decomposition.•BrO3- was reduced to Br- by surface Mn sites in MnOOH catalytic ozonation process.•Lattice oxygen and ·O2- accomplished redox cycles from Mn(IV) to Mn(III)/Mn(II).