Effects of Monochromatic UV-Visible Light and Sunlight on Fe(III)-Catalyzed Oxidation of Dissolved Sulfur Dioxide

Zuo, Yuegang; Zhan, Jian; Wu, Tao

doi:10.1007/s10874-005-2813-y

Cited by 45 publications

(27 citation statements)

References 38 publications

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“…This hypothesis is based on literature reports that sulfite acts through an oxygen abstraction mechanism to reduce chlorite/chlorate Taube, 1950, 1952) and perbromate, the bromine analog of perchlorate. Sulfite radical anions also react directly with oxygen as the first step in the formation of sulfuric acid (Haber and Wansbrough-Jones, 1932;Ermakov et al, 1997;Zuo et al, 2005). If perchlorate was reduced by oxygen abstraction, chlorate would be produced, which is easily reduced by sulfite to chloride (Taube, 1982).…”

Section: Vellanki Et Almentioning

confidence: 99%

Advanced Reduction Processes: A New Class of Treatment Processes

Vellanki

Batchelor

Abdel‐Wahab

2013

Environmental Engineering Science

169

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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.

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Section: Vellanki Et Almentioning

confidence: 99%

Advanced Reduction Processes: A New Class of Treatment Processes

Vellanki

Batchelor

Abdel‐Wahab

2013

Environmental Engineering Science

169

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“…This mechanism is analogous to the mechanism for sulfite extracting oxygen to reduce chlorite or chlorate. [24][25][26][27][28] The chlorate that is formed by reaction with the sulfite radical (Eq. (2)) could be easily reduced to chloride ion.…”

Section: Reagent and Irradiation Control Experimentsmentioning

confidence: 99%

Impacts of natural organic matter on perchlorate removal by an advanced reduction process

Duan

Batchelor

2014

Journal of Environmental Science and Health, Part A

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Perchlorate can be destroyed by Advanced Reduction Processes (ARPs) that combine chemical reductants (e.g., sulfite) with activating methods (e.g., UV light) in order to produce highly reactive reducing free radicals that are capable of rapid and effective perchlorate reduction. However, natural organic matter (NOM) exists widely in the environment and has the potential to influence perchlorate reduction by ARPs that use UV light as the activating method. Batch experiments were conducted to obtain data on the impacts of NOM and wavelength of light on destruction of perchlorate by the ARPs that use sulfite activated by UV light produced by low-pressure mercury lamps (UV-L) or by KrCl excimer lamps (UV-KrCl). The results indicate that NOM strongly inhibits perchlorate removal by both ARP, because it competes with sulfite for UV light. Even though the absorbance of sulfite is much higher at 222 nm than that at 254 nm, the results indicate that a smaller amount of perchlorate was removed with the UV-KrCl lamp (222 nm) than with the UV-L lamp (254 nm). The results of this study will help to develop the proper way to apply the ARPs as practical water treatment processes.

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“…It can speculated that longer retention time, in an elevated ratio of contact and at long contact times; hydroxyl radicals were not achieved for Cr(VI) reduction. As a result, low conversion rates was observed [33]. At a shorter residence time, Cr(III) have a lower colloid forming capacity with the OH anions produced from the photooxidation of Cr(VI) [33].…”

Section: Effect Of Photooxidation Times Under Sun Light At 12 Mg/l ₃mentioning

confidence: 99%

Remediation of Cr(VI) using C3N4/DEU-51(Fe) under sun light irradiation

Akçağlar¹

2020

Pamukkale J Eng Sci

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A hybrid nanocomposite namely ₃ ₄/ − 51() was developed to reduce the () from a textile industry wastewater. ₃ ₄/ − 51() exhibited a good cristalinity. The photocatalytic reaction of the carboxyl groups of the composite is in center and it is associated with the C-H-vibration. The optimal doping content of ₃ ₄/ − 51() was determined to be 1.2 mg/L to treat 1.6 mg/L () with a maximum yield of 98% at a sun light power of 80 mW/m 2 after 15 min at 42 ° in summer. After 5 th times sun light experiments, the ₃ ₄/ − 51() was reused with a yield of 97%. The () reduction was explained with the Langmuir-Hinshelwood (L-H) kinetic model. ₃ ₄/ − 51() hibrit nanokompoziti bir tekstil endüstrisi atık suyundaki ()'yı azaltmak için geliştirilmiştir. ₃ ₄/ − 51() kristal özellikli olup bu kompozitin merkezindeki karboksil gruplarının fotoparçalanma reaksiyonu C-H bağlanmasıyla ilgilidir. 1.6 mg/L ()'yı yaz ayında %98'lik maksimum verimle gidermek için optimum koşullar; 1.2 mg/L ₃ ₄/ − 51(), 15 dk. temas süresi, 80 mW/m 2 güneş ışığı şiddeti ve 42 ° sıcaklıktır. ₃ ₄/ − 51()nanopartikülü 5 kez kullanıldıktan sonra %97 verimle geri kullanılmıştır. () giderimi Langmuir-Hinshelwood (L-H) kinetik modelle açıklanmıştır. () giderimi Langmuir-Hinshelwood (L-H) kinetik modelle açıklanmıştır.

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Effects of Monochromatic UV-Visible Light and Sunlight on Fe(III)-Catalyzed Oxidation of Dissolved Sulfur Dioxide

Cited by 45 publications

References 38 publications

Advanced Reduction Processes: A New Class of Treatment Processes

Advanced Reduction Processes: A New Class of Treatment Processes

Impacts of natural organic matter on perchlorate removal by an advanced reduction process

Remediation of Cr(VI) using C3N4/DEU-51(Fe) under sun light irradiation

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