期刊
ENVIRONMENTAL SCIENCE & TECHNOLOGY
卷 47, 期 19, 页码 11174-11181出版社
AMER CHEMICAL SOC
DOI: 10.1021/es403199p
关键词
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资金
- Fundamental Research funds for Central Universities [13D111312]
- National Science Foundation of China [21007009, 41273108]
- Chen Guang project [10CG34]
- Chinese Universities Scientific Fund [13D311303]
An efficient and green advanced oxidation process (i.e., photo-sulfite reaction) for the simultaneous oxidation of sulfite and organic pollutants in water is reported. The photo-sulfite system (UV-Fe(III)-sulfite) is based on the Fe-catalyzed sulfite oxidation and photochemistry of Fe(III) species. SO4 center dot- and (OH)-O-center dot radicals were identified in the photo-sulfite system with radical scavenging experiments using specific alcohols. This novel technology was consistently proven to be more favorable than the alternative Fe(III)-sulfite systems for the degradation of 2,4,6-trichlorophenol (2,4,6-TCP) and other organic pollutants at all conditions tested. The reactivity of photo-sulfite system was sustained due to the spontaneous switch of photoactive species from Fe(III)-sulfito to Fe(III)-hydroxo complexes with the depletion of sulfite and the decrease in pH. In contrast, in the absence of light the performance of the Fe(III)-sulfite system was greatly diminished after the consumption of sulfite. The formation of the Fe(III)-sulfito complex is a necessary step for initiating the photo-sulfite reaction. Inhibition of the or more of the oxidation of 2,4,6-TCP and methyl orange (MO) was observed in the presence of ligands that can stabilize one reactants: Fe(III), Fe(II), or sulfite. Our study provides a new facile route for the generation of SO4 center dot- and simultaneous removal of organic and inorganic pollutants.
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