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1、第31卷第4期無機(jī)化學(xué)學(xué)報Vol_31No.42015年4月CHINESEJOURNALOFIN0RGANICCHEMISTRY696.702羥基鐵柱撐蒙脫土.MnO2復(fù)合體Fenton催化降解亞甲基藍(lán)石中亮王興星姚淑華(沈陽化工大學(xué)應(yīng)用化學(xué)學(xué)院,沈陽110142)摘要:制備了一系列羥基鐵柱撐蒙脫~-6.MnO復(fù)合材料,采用X射線粉末衍射(XRD)、比表面積(Js及掃描電子顯微鏡(SEM1研究其結(jié)構(gòu)特征。結(jié)果顯示:鈣基蒙脫土的層間距為1.47nm。經(jīng)過柱撐之后,羥基鐵撐蒙脫土的層間距增大到1.51n.羥基鐵柱撐蒙脫+-6一MnO復(fù)合體為1.55nm左右,并且比表
2、面積較原土也有明顯的增大。以亞甲基藍(lán)為目標(biāo)污染物.研究了其作為異相催化劑的催化性能,考察了溶液H202加入量、6-MnO:含量及pH值等對亞甲基藍(lán)降解性能的影響。結(jié)果表明,在實(shí)驗(yàn)條件下,催化劑的催化活性隨H:0濃度的增加而升高,當(dāng)n=0.241時,催化活性最好,且有較大的pH適用范圍。亞甲基藍(lán)的異相催化降解過程符合準(zhǔn)一級動力學(xué)方程。催化劑循環(huán)使用3次.仍然具有良好的活性關(guān)鍵詞:鐵柱撐蒙脫土一MnO復(fù)合體;異相催化;亞甲基藍(lán)中圖分類號:0643文獻(xiàn)標(biāo)識碼:A文章編號:1001.4861(zo15)o4—0696—07DOI:10.11862/CJIC2015.11
3、2HeterogeneousFentonDegradationofMethyleneBlueby-MnO2_CoatedFe-PillaredBentoniteSHIZhong—LiangWANGXing—XingYAOShu-Hua(SchoolofAppliedChemistry,ShenyangUniversityofChemicalTechnology,Shenyang110142,China)Abstract:Aseriesof6一MnO2-coatedFe-pillaredbentonitecompositematerialsweresynthesi
4、zedandthesampleswereusedascatalystsfortheheterogeneousFentondegradationofmethyleneblue.Themicrostructureofthecat—alystswascharacterizedbyX—raydiffraction(XRD),specificsurfaceareameasurements(SBE1),scanningelectronmicroscopy(SEM).Theresuhsshowedthatthepillaringprocessincreasedthebasal
5、spacing(d001)from1.47nmforbentonite(Mto1.51nmfortheHydroxyl-pillaredbentonite(H-Fe—P-E)and1.55nmforthe-MnO2一coatedFe—pillaredbentonite(H—Fe-P—E—M).TheSBE-rvaluesofthesampleswereincreasedafterpillaringcomparedwithbentonite.Thecatalyticactivityofdifferentsampleswasestimatedbymeasuringt
6、hedegradationrateofmethy-leneblue(MB)inaqueoussolutionatMBconcentration=50mg·L~,catalystdosage=0.1g·L~,T=25℃,andtheeffectsofvariousexperimentalparameterssuchasinitialH2O2concentration,一Mn02contentandinitialsolutionpHvalueonMBdegradationwerestudied.Theresultsshowedthatthecatalyticacti
7、vityof6一MnO2-coatedFe-pillaredbentoniteincreasedwithH202concentrationandreachedaoptimalcatalyticresultwhenthemolarratioofn/nMn=0.241.Thekineticsofdegradationreactioncanbeexpressedbythefirst-orderreactionkineticmode1.Inaddition,therecyclabilityofthepreparedcatalystisalsoconfirmed.Thec
8、atalystretai