HIGHLIGHTS
SUMMARY
The 254 nm UV light-activated persulfate (S2 O8 2-; ε254 nm=20-22 M-1 cm-1 ) is a clean source for producing SO4. - with high quantum yield via the homolytic bond cleavage: S2 O8 2- + hν → 2 SO4. -. At 1.0 × 10-3 M S2 O8 2- concentrations, using UV UV/VUV photolysis. radiation, the mineralization efficiency is close to that measured in UV/VUV photolysis. It also confirmed that, in the presence S2 O8 2 -, the positive effect of VUV is most probably attributable to the regeneration of SO4. - and not . . .
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