期刊
MOLECULES
卷 24, 期 12, 页码 -出版社
MDPI
DOI: 10.3390/molecules24122307
关键词
sulfite photolysis; arsenic; laser flash photolysis; quantum yields; oxysulfur radicals
资金
- NSFC [51811530099, 18-53-53006_GFEN]
- Russian Foundation for Basic Research [51811530099, 18-53-53006_GFEN]
- Russian Foundation for Basic Research project [17-03-00252]
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 (lambda(ex) = 266 nm), the signals of SO3 center dot- and e(aq)(-) generated by photolysis of sulfite at 266 nm were discerned. Quantum yields for photoionization of HSO3- (0.01) and SO32- (0.06) were also measured. It has been established that e(aq)(-) does not react with SO32-, but reacts with HSO3- with a rate constant 8 x 10(7) M(-1)s(-1).
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