Pathway fraction of bromate formation during O3 and O3/H2O2 processes in drinking water treatment

Qi, Shengqi; Mao, Yuqin; Lv, Miao; Sun, Lingling; Wang, Xiaomao; Yang, Hongwei; Xie, Yuefeng F.

doi:10.1016/j.chemosphere.2015.11.022

Cited by 24 publications

(5 citation statements)

References 26 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Additionally, ozone degraded aromatic rings in organic species to olefins, which then react with the molecular ozone to form H 2 O 2 . H 2 O 2 was able to couple with the molecular ozone to form more • OH and act as a deoxidizer to reduce BrO 3 – . Therefore, the role of H 2 O 2 in catalytic ozonation cannot be ignored.…”

Section: Resultsmentioning

confidence: 99%

“…46 H 2 O 2 was able to couple with the molecular ozone to form more • OH 46 and act as a deoxidizer to reduce BrO 3 − . 47 Therefore, the role of H 2 O 2 in catalytic ozonation cannot be ignored. Panels g and h of Figure 5 show that 23 but ignored the detailed reaction mechanism such as the surface reaction sites and reaction pathway.…”

Section: Carbon 2h O Carbon H O Ohmentioning

confidence: 99%

See 1 more Smart Citation

Insights into Heteroatom-Doped Graphene for Catalytic Ozonation: Active Centers, Reactive Oxygen Species Evolution, and Catalytic Mechanism

Song

Wang

et al. 2019

Environ. Sci. Technol.

155

View full text Add to dashboard Cite

To guide the design of novel graphene-based catalysts in catalytic ozonation for micropollutant degradation, the mechanism of catalytic ozonation with heteroatom-doped graphene was clarified. Reduced graphene oxide doped with nitrogen, phosphorus, boron, and sulfur atoms (N-, P-, B-, and S-rGO) were synthesized, and their catalytic ozonation performances were evaluated in the degradation of refractory organics and bromate elimination simultaneously. Doping with heteroatoms, except sulfur, significantly improved the catalytic ozonation activity of graphene. Introducing sulfur atoms destroyed the stability of graphene during ozonation, with the observed partial performance improvement caused by surface adsorption. Degradation pathways for selected refractory organics were proposed based on the intermediates identified using high-resolution Orbitrap mass spectroscopy and gas chromatographic–mass spectroscopy. Three and six new unopened intermediates were identified in benzotriazole and p-chlorobenzoic acid degradation, respectively. Roles of chemical functional groups, doped atoms, free electron, and delocalized π electron of heteroatom-doped graphene in catalytic ozonation were identified, and contributions of these active centers to the formation of reactive oxygen species (ROS), including hydroxyl radicals, superoxide radicals, singlet oxygen, and H2O2, were evaluated. A mechanism for catalytic ozonation by heteroatom-doped graphene was proposed for the first time.

show abstract

Section: Resultsmentioning

confidence: 99%

Section: Carbon 2h O Carbon H O Ohmentioning

confidence: 99%

Insights into Heteroatom-Doped Graphene for Catalytic Ozonation: Active Centers, Reactive Oxygen Species Evolution, and Catalytic Mechanism

Song

Wang

et al. 2019

Environ. Sci. Technol.

155

View full text Add to dashboard Cite

show abstract

“…The increasing pH favours the formation of more OBr− ions, which readily decomposes O3 to form HO• radicals, therefore, accelerating bromate formation. In acidic conditions, ozone is stable and more HOBr is present, therefore, bromate formation is suppressed [60].…”

Section: Factors Affecting Bromate Minimizationmentioning

confidence: 99%

Advances in Treatment of Brominated Hydrocarbons by Heterogeneous Catalytic Ozonation and Bromate Minimization

Gounden

Jonnalagadda

2019

Molecules

View full text Add to dashboard Cite

The formation of carcinogenic bromate ions is a constraint when ozone is used for the remediation of water containing brominated organic materials. With its strong oxidizing ability, ozone rapidly transforms bromide in aqueous media to bromate, through a series of reactions involving hydroxyl radicals. Several strategies, such as limiting the ozone concentration, maintaining pH < 6, or the use of ammonia or hydrogen peroxide were explored to minimize bromate generation. However, most of the above strategies had a negative effect on the ozonation efficiency. The advanced oxidation processes, using catalysts together with ozone, have proven to be a promising technology for the degradation of pollutants in wastewater, but very few studies have been conducted to find ways to minimize bromate formation during this approach. The proposed article, therefore, presents a comprehensive review on recent advances in bromate reduction in water by catalytic ozonation and proposes reaction mechanisms associated with the catalytic process. The main aim is to highlight any gaps in the reported studies, thus creating a platform for future research and a quest to find environment friendly and efficacious catalysts for minimizing bromate formation in aqueous media during ozonation of brominated organic compounds.

show abstract

“…The concentration of bromide ions in fresh water ranges from 10 μg/L to about 1000 μg/L, and in marine water the content is much higher. In many coastal areas, bromide concentrations may be higher due to the influence of seawater [ 9 ]. Due to the presence of halogens, the treatment of saline water and wastewater is challenging and there is an increasing need for techniques removing organic contaminants from brackish industrial and municipal waste water [ 10 ].…”

Section: Introductionmentioning

confidence: 99%

The Role of Sulphate and Phosphate Ions in the Recovery of Benzoic Acid Self-Enhanced Ozonation in Water Containing Bromides

Fijołek¹,

Świetlik²,

Frankowski³

2021

Molecules

View full text Add to dashboard Cite

The ozonation of aromatic compounds in low-pH water is ineffective. In an acidic environment, the decomposition of ozone into hydroxyl radicals is limited and insufficient for the degradation of organic pollutants. Radical processes are also strongly inhibited by halogen ions present in the reaction medium, especially at low pH. It was shown that even under such unfavorable conditions, some compounds can initiate radical chain reactions leading to the formation of hydroxyl radicals, thus accelerating the ozonation process, which is referred to as so-called “self-enhanced ozonation”. This paper presents the effect of bromides on “self-enhanced ozonation” of benzoic acid (BA) at pH 2.5. It is the first report to fully and quantitatively describe this process. The presence of only 15 µM bromides in water inhibits ozone decomposition and completely blocks BA degradation. However, the effectiveness of this process can be regained by ozonation in the presence of phosphates or sulphate. The addition of these inorganic salts to the bromide-containing solution helps to recover ozone decomposition and BA degradation efficiency. As part of this research, the fractions of hydroxyl, sulphate and phosphate radicals reacting with benzoic acid and bromides were calculated.

show abstract

Pathway fraction of bromate formation during O3 and O3/H2O2 processes in drinking water treatment

Cited by 24 publications

References 26 publications

Insights into Heteroatom-Doped Graphene for Catalytic Ozonation: Active Centers, Reactive Oxygen Species Evolution, and Catalytic Mechanism

Insights into Heteroatom-Doped Graphene for Catalytic Ozonation: Active Centers, Reactive Oxygen Species Evolution, and Catalytic Mechanism

Advances in Treatment of Brominated Hydrocarbons by Heterogeneous Catalytic Ozonation and Bromate Minimization

The Role of Sulphate and Phosphate Ions in the Recovery of Benzoic Acid Self-Enhanced Ozonation in Water Containing Bromides

Contact Info

Product

Resources

About