紫外光助零价铁活化过硫酸盐降解全氟辛烷磺酸盐
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摘要
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 activate S_2O_8~(2-) to produce highly reactive sulfate radicals(SO_4·-) to degrade PFOS in water. After a 24 h reaction,the degradation rate can reach 91%. 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 increase 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.
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 activate S_2O_8~(2-) to produce highly reactive sulfate radicals(SO_4·-) to degrade PFOS in water. After a 24 h reaction,the degradation rate can reach 91%. 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 increase 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.
引文
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[2]李志芬,马太玲,史雅娟.持久性有机污染物全氟辛烷磺酸PFOS污染生态环境研究进展[J].山东农业大学学报(自然科学版),2015,46(2):204-210.
[3]李玲,赵康峰,李毅民.全氟辛烷磺酸和全氟辛酸神经毒性机制研究进展[J].环境卫生学杂志,2013,(3):167-169.
[4]童锡臻,石宝友,解岳,等.改性活性炭对水中PFOS的吸附去除研究[J].环境科学,2012,33(9):3132-3138.
[5]王双璃.电增强碳纳米管/活性炭纤维吸附PFOA,PFOS的研究[D].辽宁大连:大连理工大学,2013.
[6]赵德明.超声波降解全氟辛烷磺酸和全氟辛酸的动力学[J].化工学报,2011,(3):829-835.
[7]DIMITROV S,KAMENSKA V,WALKER J,et al.Predicting the biodegradation products of perfluorinated chemicals using Catabol[J].Sar Qsar Environ Res,2004,15:69-82.
[8]ZHUO Q,DENG S,YANG B,et al.Efficient electrochemical oxidation of perfluorooctanoate using a Ti/Sn O2-Sb-Bi anode[J].Environ Sci Technol,2011,45:2973-2979.
[9]陈静,张彭义,刘剑.全氟羧酸在185 nm真空紫外光下的降解研究[J].环境科学,2007,(8):772–776.
[10]金玲.光化学降解水中全氟辛烷磺酸及其替代物的研究[D].北京:清华大学,2014.
[11]HORI H,YAMAMOTO A,HAYAKAWA E,et al.Efficient decomposition of environmentally persistent perfluoroearboxylic acids by use of persulfate as a photochemical oxidant[J].Environ.Sci.Technol.2005,39:2383-2388.
[12]HORI H,HAYAKAWA E,EINAGA H,et al.Decomposition of environmentally persistent perfluorooctanoic acid in water by photochemical approaches[J].Environ Sci Technol,2004,38:6118-6124.
[13]CAO M H,WANG B B,YU H S,et al.Photochemical decomposition of perfluorooctanoic acid in aqueaus periodate with VUV and W light irradiation[J].Hazardous.Mater.2010,179(1-3):1143.
[14]THI L A P,DO H T,LEE Y C,et al.Photochemical decomposition of perfluorooctanoic acids in aqueous carbonate solution with UV irradiation[J].CHEMICAL e NGINEERING JOURNAL,2013,221(4):258-263.
[15]HORI H,MURAYAMA M,et al.Efficient mineralization of hydroperfluorocarboxylic acids with persulfate in hot water[J].Catalysis Today,2010,151(1-2):131-136.
[16]LEE Y C,LO S L,CHIUEH P T,et al.Efficient decomposition of perfluorocarboxylic acids in aqueous solution using microwave-induced persulfate[J].Water Res.2009,43:2811-2816.
[17]杨佘维.真空紫外耦合高频超声对水中全氟辛基磺酸钾(PFOS)的脱氟研究[D].广东广州:华南理工大学,2013.
[18]宋洲.紫外光化学氧化-还原处理全氟辛酸的研究[D].湖北武汉:华中科技大学,2014.
[19]伍秀琼.活性炭负载纳米零价铁去除溴酸盐的研究[D].湖南长沙:湖南大学,2013.
[20]LEE Y C,LO S L,CHIUEH P T,et al.Microwave-hydrothermal decomposition of perfluoxooctanoic acid in water by iron-activated persulfate oxidation[J].Water Res.2010,44:886-892.
[21]TAN C Q,GAO N Y,CHU W H,et al.Degradation of diuron by persuifate activated with ferrous ion[J].Sep.Purif.Technol.2012,95:44-48.
[22]OH S Y,KIM H W,PARK J M,et al.Oxidation of polyvinyl alcohol persulfate activated with heat,Fe2+and zerovalent iron[J].Hazard.Mater.2009,168:346-351.
[23]LIANG C J,BRUELL C J,MARLEY M C,et al.Persulfate oxidation for in situ remediation of TCE.I.Activated by ferrous ion with and without a persulfate-thiosulfate redox couple[J].Chemosphere,2004,55:1213-1223.
[24]HORI H,YAMAMOTO A,KOIKE K.Photochemical decomposition of environmentally persistent short-chain perfluorocarboxylic acids in water mediated by iron(II)/(III)redox reactions[J].Chemosphere,2007,68:572–578.
[25]DEVI L G,RAJASHEKHAR K E,RAJU K S A,et al.Kinetic modeling based on the non-linear regression analysis for the degradation of alizarin red S by advanced photo Fenton process using zero valent metallic iron as the catalyst[J].journal of Mol ecular catalysis A chemical,2009,314(1-2):88-94.
[26]LAU T K,CHU W,GRAHAM N J D.The aqueous degradation of butylated hydroxyanisole by UV/52082:study of reaction mechanisms via dimerization and mineralization[J].Environ.Sci.Technol.2007,41:613-619.