紫外光助零价铁活化过硫酸盐降解全氟辛烷磺酸盐

UV + Zero-valent Iron Activate Persulfate to Degrade Perfluorinated Sulfonates

针对全氟辛烷磺酸盐(PFOS)去除,构建紫外光助零价铁活化过硫酸盐降解体系。考察了体系中零价铁粉浓度、过硫酸盐浓度和pH值对降解效果的影响。结果表明:紫外光和零价铁共同激活过硫酸盐产生硫酸根自由基(SO_4·^-)攻击水中PFOS,至反应24 h时,体系对PFOS的降解率达到91%;适度增加体系零价铁粉浓度、过硫酸钠浓度会提高体系对PFOS的降解率,但持续增加零价铁粉浓度、过硫酸钠浓度,不会持续增加体系对PFOS的降解率;酸性适度(pH=3,pH=4)条件下体系对PFOS的降解效果优于强酸(pH=2)和弱酸偏中性(pH=5,pH=6)条件下的降解效果。

Targeting to remove typical perfluorochemicals perfluorinated sulfonates （PFOS） , adegradation system of UV ＋ zero - valent iron activated persulfate was built. The degradation effects of zero - valent iron dose, persulfate dose and pH were studied. The results show that UV and zero - valent iron can acti-vate S2O8^2- to produce highly reactive sulfate radicals （ SO4^2·^- ） to degrade PFOS in water. After a 24 h reaction, the degradation rate can reach 9 1 % . Modest increase of zero - valent iron dose and persulfate dose will increase the rate of degradation, while too much zero - valent iron and persulfate will not in-crease the rate of degradation. When pH = 3 - 4 , the degradation effect is better than that of strong acid pH =2 or weak acid partial neutral pH = 5- 6.