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 journalArticlepeer-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 (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.

Original languageEnglish
Article number2307
Number of pages8
JournalMolecules
Volume24
Issue number12
DOIs
Publication statusPublished - 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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