Different role of bisulfite/sulfite in UVC-S(IV)-O2 system for arsenite oxidation in water

Tao Luo; Zhenhua Wang; Yi Wang; Zizheng Liu; Ivan P. Pozdnyakov

doi:10.3390/molecules24122307

Different role of bisulfite/sulfite in UVC-S(IV)-O₂ system for arsenite oxidation in water

Tao Luo, Zhenhua Wang, Yi Wang, Zizheng Liu, Ivan P. Pozdnyakov

Research output: Contribution to journal › Article › peer-review

5 Citations (Scopus)

Abstract

It is of interest to use UV-sulfite based processes to degrade pollutants in wastewater treatment process. In this work, arsenic (As(III)) has been selected as a target pollutant to verify the efficacy of such a hypothesized process. The results showed that As(III) was quickly oxidized by a UV-sulfite system at neutral or alkaline pH and especially at pH 9.5, which can be mainly attributed to the generated oxysulfur radicals. In laser flash photolysis (LFP) experiments (λ_ex = 266 nm), the signals of SO₃ ^•− and e_aq ⁻ generated by photolysis of sulfite at 266 nm were discerned. Quantum yields for photoionization of HSO₃ ⁻ (0.01) and SO₃ ²⁻ (0.06) were also measured. It has been established that e_aq ⁻ does not react with SO₃ ²⁻, but reacts with HSO₃ ⁻ with a rate constant 8 × 10⁷ M⁻¹s⁻¹.

Original language	English
Article number	2307
Number of pages	8
Journal	Molecules
Volume	24
Issue number	12
DOIs	https://doi.org/10.3390/molecules24122307
Publication status	Published - 21 Jun 2019

Keywords

Arsenic
Laser flash photolysis
Oxysulfur radicals
Quantum yields
Sulfite photolysis
ACID
S(IV)
oxysulfur radicals
BEHAVIOR
quantum yields
arsenic
laser flash photolysis
RADICAL-ANIONS
REDUCTIVE DEFLUORINATION
SPECTROSCOPY
KINETICS
DEGRADATION
SPECTRA
sulfite photolysis
PHOTOOXIDATION

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title = "Different role of bisulfite/sulfite in UVC-S(IV)-O2 system for arsenite oxidation in water",

abstract = "It is of interest to use UV-sulfite based processes to degrade pollutants in wastewater treatment process. In this work, arsenic (As(III)) has been selected as a target pollutant to verify the efficacy of such a hypothesized process. The results showed that As(III) was quickly oxidized by a UV-sulfite system at neutral or alkaline pH and especially at pH 9.5, which can be mainly attributed to the generated oxysulfur radicals. In laser flash photolysis (LFP) experiments (λex = 266 nm), the signals of SO3 •− and eaq − generated by photolysis of sulfite at 266 nm were discerned. Quantum yields for photoionization of HSO3 − (0.01) and SO3 2− (0.06) were also measured. It has been established that eaq − does not react with SO3 2−, but reacts with HSO3 − with a rate constant 8 × 107 M−1s−1.",

keywords = "Arsenic, Laser flash photolysis, Oxysulfur radicals, Quantum yields, Sulfite photolysis, ACID, S(IV), oxysulfur radicals, BEHAVIOR, quantum yields, arsenic, laser flash photolysis, RADICAL-ANIONS, REDUCTIVE DEFLUORINATION, SPECTROSCOPY, KINETICS, DEGRADATION, SPECTRA, sulfite photolysis, PHOTOOXIDATION",

author = "Tao Luo and Zhenhua Wang and Yi Wang and Zizheng Liu and Pozdnyakov, {Ivan P.}",

year = "2019",

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AU - Luo, Tao

AU - Wang, Zhenhua

AU - Wang, Yi

AU - Liu, Zizheng

AU - Pozdnyakov, Ivan P.

PY - 2019/6/21

Y1 - 2019/6/21

N2 - It is of interest to use UV-sulfite based processes to degrade pollutants in wastewater treatment process. In this work, arsenic (As(III)) has been selected as a target pollutant to verify the efficacy of such a hypothesized process. The results showed that As(III) was quickly oxidized by a UV-sulfite system at neutral or alkaline pH and especially at pH 9.5, which can be mainly attributed to the generated oxysulfur radicals. In laser flash photolysis (LFP) experiments (λex = 266 nm), the signals of SO3 •− and eaq − generated by photolysis of sulfite at 266 nm were discerned. Quantum yields for photoionization of HSO3 − (0.01) and SO3 2− (0.06) were also measured. It has been established that eaq − does not react with SO3 2−, but reacts with HSO3 − with a rate constant 8 × 107 M−1s−1.

AB - It is of interest to use UV-sulfite based processes to degrade pollutants in wastewater treatment process. In this work, arsenic (As(III)) has been selected as a target pollutant to verify the efficacy of such a hypothesized process. The results showed that As(III) was quickly oxidized by a UV-sulfite system at neutral or alkaline pH and especially at pH 9.5, which can be mainly attributed to the generated oxysulfur radicals. In laser flash photolysis (LFP) experiments (λex = 266 nm), the signals of SO3 •− and eaq − generated by photolysis of sulfite at 266 nm were discerned. Quantum yields for photoionization of HSO3 − (0.01) and SO3 2− (0.06) were also measured. It has been established that eaq − does not react with SO3 2−, but reacts with HSO3 − with a rate constant 8 × 107 M−1s−1.

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KW - SPECTROSCOPY

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KW - DEGRADATION

KW - SPECTRA

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KW - PHOTOOXIDATION

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Different role of bisulfite/sulfite in UVC-S(IV)-O₂ system for arsenite oxidation in water

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