偶氮染料废水的脱色降解及机理研究(I)

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1、河北大学博士学位论文偶氮染料废水的脱色降解及机理研究姓名：宋亚丽申请学位级别：博士专业：分析化学指导教师：李记太20090601摘要异相光催化技术用于处理染料废水具有重要的环境经济效益。在太阳光照射下以纳米Ti02为催化剂，考察了10种偶氮染料于常温条件下的脱色效果，酸性橙74的脱色率为47．8％，其余的几乎完全脱色；研究了直接蓝78在光降解过程中的影响因素；利用UV-Ⅵs和LC．MS对降解产物进行测定，探讨了直接蓝78降解的可能历程。关键词偶氮染料超声脱色降解吸附Fenton试剂光降解lIAbstract曼曼!曼曼寡I；II．I一．=；一__；_一I!曼鼍曼!曼鼍Theazodye

2、wastewaterischaracterizedwithhi曲valueofCODer,complicationoforganiccomponents，moredifficultremediation，andhi曲colority．Increasingattentionhasbeenfocusedontheeconomicandefficientprocedureforthedecolorizationordegradationofazodyesaqueoussolution．Themethodsusedfortreatingazodyewastewateraredescribed

3、．Progressintreatmentofazodyepollutantsinwaterbyusingultrasoundtechnology(includingultrasoundirradiationindividuallyandultrasonicwavesinconjunction诵t11othertechniques)isreviewed．Decolorizationordegradationofazodyesaqueoussolutionbyultrasound／exfoliatedgraphite，ultrasound／Fenton，ultrasound／Flyash

4、／H202andkaolinitewasstudied．Theresulmshowedthattheprocessesareeffectiveinremovingazodyesfromaqueoussolution．AcombinationofultrasoundandexfoliatedgraphitewasusedtotreatAcidBrown348andDirectBlue78aqueoussolutions，respectively．Theinfluenceofvariousaffectingfactors，suchasirradiationtime，reactiontem

5、perature，pHvalueandtheinitialconcentrationweresystematicallyevaluated．Themodelofazodyeadsorptiononexfoliatedgraphiteunderultrasoundirradiationwasinvestigated．ItCanachievebetterresultsthaneitherexfoliatedgraphiteorultrasoundonly．LowpHvalueisconducivetotheremovalofthedye．TheLangmuirandFreundlichi

6、sothermswereusedtoobservesorptionphenomenaofexfoliatedgraphiteunderultrasoundirradiation．TheresultshaveshownthattheLangmuirisothermandFreundlichisothermwerewellfittedintotheexperimentaldata．Intheoptimumconditions，theremovalratioofAcidBrown348fromindustrialwastewaterwas85．O％．Fentonprocessisoneof

7、theadvancedoxidationtechnology,anditcombinedwitllultrasoundiseffectivetodegradetheorganiccontaminations．InthecombinationofultrasoundandFentonreagent，thedegradationefficiencyof98．6％(AcidRed88)and99．9％(AcidRed97)wasachievedrespectiv