Abstract
Chemical oxygen demand (COD) removal rates of sulfosalicylic acid (SSal) degraded by three advanced oxidation processes (AOPs): O3/UV, O3/TiO2/UV and O3/V-O/TiO2 are compared in this paper. (V = Vanadium). The results show that O3/V-O/TiO2 is the most effective process among three AOPs and the order of degradation efficiencies at different pH values is shown as O3/V-O/TiO2 > O3/TiO2/UV > O3/UV. For example, at the buffered solution of pH 6.8, the COD removal rate of O3/V-O/TiO2 reaches 70% in 30 minutes, but those of O3/TiO2/UV and O3/UV are 55% and 47% at the same conditions, respectively. Furthermore, the effect of CO3 2 −on the COD removal rates of three AOPs shows that O3/V-O/TiO2 and O3/TiO2/UV may be considerable promising methods to overcome the limitation of the presence of radical scavenger in solution. Both the adsorption of SSal on catalysts and other oxidants (atom oxygen, photo-generated hole) must be responsible for the above result.
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