Recent trends in the chemistry of sulfur-containing reducing agents

Макаров, С. В.

doi:10.1070/rc2001v070n10abeh000659

Cited by 88 publications

(44 citation statements)

References 95 publications

(155 reference statements)

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Some plausible reaction schemes have been presented previously: One such suggestion is that HSO 3 end-groups are formed through transfer reactions [44] in bisulfite systems, and Makarov [45] proposed a mechanism for the decomposition of SFS in acidic conditions, involving the formation of the SO K$ 2 radical anion. With these suggestions as a guide, a starting hypothesis is that the most plausible reactive species formed in the redox reaction of TBHP/Fe with SFS or MBS are SO K$ 2 and/or SO K$ 3 radicals, although other species such as HOCH $ 2 may also be postulated to be formed.…”

Section: End Group Assignmentsmentioning

confidence: 97%

Radical entry mechanisms in redox-initiated emulsion polymerizations

Lamb¹,

Fellows²,

Gilbert³

2005

Polymer

View full text Add to dashboard Cite

Section: End Group Assignmentsmentioning

confidence: 97%

Radical entry mechanisms in redox-initiated emulsion polymerizations

Lamb¹,

Fellows²,

Gilbert³

2005

Polymer

View full text Add to dashboard Cite

“…Dithionite is known to have a long, weak S-S bond that can be broken to produce two sulfur dioxide radical anions (SO À 2 ) (Makarov, 2001).…”

Section: Reducing Agentsmentioning

confidence: 99%

Advanced Reduction Processes: A New Class of Treatment Processes

Vellanki

Batchelor

Abdel‐Wahab

2013

Environmental Engineering Science

172

View full text Add to dashboard Cite

A new class of treatment processes called advanced reduction processes (ARPs) is proposed. ARPs combine activation methods and reducing agents to form highly reactive reducing radicals that degrade oxidized contaminants. Batch screening experiments were conducted to identify effective ARPs by applying several combinations of activation methods (ultraviolet light, ultrasound, electron beam, and microwaves) and reducing agents (dithionite, sulfite, ferrous iron, and sulfide) to degradation of four target contaminants (perchlorate, nitrate, perfluorooctanoic acid, and 2,4 dichlorophenol) at three pH-levels (2.4, 7.0, and 11.2). These experiments identified the combination of sulfite activated by ultraviolet light produced by a low-pressure mercury vapor lamp (UV-L) as an effective ARP. More detailed kinetic experiments were conducted with nitrate and perchlorate as target compounds, and nitrate was found to degrade more rapidly than perchlorate. Effectiveness of the UV-L/sulfite treatment process improved with increasing pH for both perchlorate and nitrate. We present the theory behind ARPs, identify potential ARPs, demonstrate their effectiveness against a wide range of contaminants, and provide basic experimental evidence in support of the fundamental hypothesis for ARP, namely, that activation methods can be applied to reductants to form reducing radicals that degrade oxidized contaminants. This article provides an introduction to ARPs along with sufficient data to identify potentially effective ARPs and the target compounds these ARPs will be most effective in destroying. Further research will provide a detailed analysis of degradation kinetics and the mechanisms of contaminant destruction in an ARP.

show abstract

“…To pave the way towards detailed mechanistic insights into the chlorite-TU reaction, knowledge of the kinetics and mechanism of the title reaction is eagerly anticipated. Owing to the formation of SO 2 H -/SO 2 2-ions from the rapid decomposition of TDO in alkaline solutions, [5,6] TDO has been extensively applied in chemistry and chemical technology as a special and effective reducing agent, [7][8][9][10] especially for the potential chemical reduction of graphene oxide in recent years. [11,12] Its reducing ability increases with aging in alkaline solution.…”

Section: Introductionmentioning

confidence: 99%

Mechanism Involving Hydrogen Sulfite Ions, Chlorite Ions, and Hypochlorous Acid as Key Intermediates of the Autocatalytic Chlorine Dioxide–Thiourea Dioxide Reaction

Horváth

Duan

et al. 2015

Eur J Inorg Chem

View full text Add to dashboard Cite

The kinetics of the chlorine dioxide–thiourea dioxide reaction was investigated by monitoring absorbance–time profiles at λ = 360 nm. Under acidic conditions, the primary carbon‐containing product is cyanamide, not urea as considered previously for many oxidation reactions of thiourea dioxide. Increase of the rate of the reaction by an increase of pH can be readily explained by the slow pH‐dependent formation of a more reactive form of thiourea dioxide (TDO) that is produced steadily and unavoidably as the stock TDO solution ages. We have also found that the absorbance–time profiles of the chlorine dioxide–TDO reaction are sigmoidal with excess TDO. The addition of methionine as a hypochlorous acid scavenging agent inhibits the reaction significantly, whereas the addition of chlorite ions and trace amounts of hydrogen sulfite ions accelerates the decay of chlorine dioxide. On the basis of these experiments, a sixteen‐step kinetic model involving hypochlorous acid, chlorite ions, and hydrogen sulfite ions as key intermediates that provide an autocatalytic cycle is proposed to account for the overall kinetic behavior observed, including the slow rearrangement of TDO.

show abstract

Recent trends in the chemistry of sulfur-containing reducing agents

Cited by 88 publications

References 95 publications

Radical entry mechanisms in redox-initiated emulsion polymerizations

Radical entry mechanisms in redox-initiated emulsion polymerizations

Advanced Reduction Processes: A New Class of Treatment Processes

Mechanism Involving Hydrogen Sulfite Ions, Chlorite Ions, and Hypochlorous Acid as Key Intermediates of the Autocatalytic Chlorine Dioxide–Thiourea Dioxide Reaction

Contact Info

Product

Resources

About