Overlooked Role of Sulfur-Centered Radicals During Bromate Reduction by Sulfite

Environmental Science & Technology
Junlian QiaoXiaohong Guan

Abstract

In this work, the kinetics and mechanisms of the reductive removal of BrO3- by sulfite in air atmosphere were determined. BrO3- could be effectively reduced by sulfite at pHini 3.0-6.0, and the reduction rate of BrO3- increased with decreasing pH. The coexisting organic contaminants with electron-rich moieties could be degraded, accompanied with BrO3- reduction by sulfite. The reaction stoichiometries of -Δ[sulfite]/Δ[bromate] were determined to be 3.33 and 15.63 in the absence and presence of O2, respectively. Many lines of evidence verified that the main reactions in the BrO3-/sulfite system in air atmosphere included the reduction of BrO3- to HOBr and its further reduction to Br-, as well as the oxidation of H2SO3 by BrO3- to form SO3·- and its further transformation to SO4·-. Moreover, SO4·- rather than HOBr was determined to be the major active oxidant in the BrO3-/sulfite system. SO3·- played a key role in the over-stoichiometric sulfite consumption because of its rapid reaction with dissolved oxygen. However, the formed SO3·- was further oxidized by BrO3- in the N2 atmosphere. BrO3- reduction by sulfite is an alternative for controlling BrO3- in water treatment because it was effective in real water at pHini ≤ 6.0.

References

Jul 1, 1990·Environmental Health Perspectives·Y KurokawaY Hayashi
Jul 4, 2001·Environmental Science & Technology·U Pinkernell, U Von Gunten
Jul 9, 2004·Inorganic Chemistry·Wagner A AlvesRoberto B Faria
May 17, 2005·Water Research·Chii ShangXin Yang
Nov 6, 2008·Environmental Science & Technology·Cristina T MatosJoão G Crespo
Jan 20, 2011·Magnetic Resonance in Chemistry : MRC·Kalina Ranguelova, Ronald P Mason
Jun 12, 2012·Environmental Science & Technology·Xuchun LiXiaowei Liu
Jul 27, 2012·Environmental Science & Technology·Jing-Yun Fang, Chii Shang
Apr 7, 2016·Water Research·Yanjun JiangDavid A Reckhow
May 20, 2016·Water Environment Research : a Research Publication of the Water Environment Federation·Haixiang LiSiqing Xia
Aug 16, 2016·Environmental Science & Technology·Fabian SoltermannUrs von Gunten
Mar 18, 2017·Water Research·Fabian SoltermannUrs von Gunten
Jun 27, 2017·Environmental Science & Technology·Dae Wi Min, Wonyong Choi
Jan 29, 2019·Environmental Science & Technology·Zhihao ChenPaul G Tratnyek

❮ Previous
Next ❯

Related Concepts

Trending Feeds

COVID-19

Coronaviruses encompass a large family of viruses that cause the common cold as well as more serious diseases, such as the ongoing outbreak of coronavirus disease 2019 (COVID-19; formally known as 2019-nCoV). Coronaviruses can spread from animals to humans; symptoms include fever, cough, shortness of breath, and breathing difficulties; in more severe cases, infection can lead to death. This feed covers recent research on COVID-19.

Blastomycosis

Blastomycosis fungal infections spread through inhaling Blastomyces dermatitidis spores. Discover the latest research on blastomycosis fungal infections here.

Nuclear Pore Complex in ALS/FTD

Alterations in nucleocytoplasmic transport, controlled by the nuclear pore complex, may be involved in the pathomechanism underlying multiple neurodegenerative diseases including Amyotrophic Lateral Sclerosis and Frontotemporal Dementia. Here is the latest research on the nuclear pore complex in ALS and FTD.

Applications of Molecular Barcoding

The concept of molecular barcoding is that each original DNA or RNA molecule is attached to a unique sequence barcode. Sequence reads having different barcodes represent different original molecules, while sequence reads having the same barcode are results of PCR duplication from one original molecule. Discover the latest research on molecular barcoding here.

Chronic Fatigue Syndrome

Chronic fatigue syndrome is a disease characterized by unexplained disabling fatigue; the pathology of which is incompletely understood. Discover the latest research on chronic fatigue syndrome here.

Evolution of Pluripotency

Pluripotency refers to the ability of a cell to develop into three primary germ cell layers of the embryo. This feed focuses on the mechanisms that underlie the evolution of pluripotency. Here is the latest research.

Position Effect Variegation

Position Effect Variagation occurs when a gene is inactivated due to its positioning near heterochromatic regions within a chromosome. Discover the latest research on Position Effect Variagation here.

STING Receptor Agonists

Stimulator of IFN genes (STING) are a group of transmembrane proteins that are involved in the induction of type I interferon that is important in the innate immune response. The stimulation of STING has been an active area of research in the treatment of cancer and infectious diseases. Here is the latest research on STING receptor agonists.

Microbicide

Microbicides are products that can be applied to vaginal or rectal mucosal surfaces with the goal of preventing, or at least significantly reducing, the transmission of sexually transmitted infections. Here is the latest research on microbicides.