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时间:2020-03-27
《羟基铁柱撑蒙脱土-δ-MnO_2复合体Fenton催化降解亚甲基蓝.pdf》由会员上传分享,免费在线阅读,更多相关内容在行业资料-天天文库。
1、第31卷第4期无机化学学报Vol_31No.42015年4月CHINESEJOURNALOFIN0RGANICCHEMISTRY696.702羟基铁柱撑蒙脱土.MnO2复合体Fenton催化降解亚甲基蓝石中亮王兴星姚淑华(沈阳化工大学应用化学学院,沈阳110142)摘要:制备了一系列羟基铁柱撑蒙脱~-6.MnO复合材料,采用X射线粉末衍射(XRD)、比表面积(Js及扫描电子显微镜(SEM1研究其结构特征。结果显示:钙基蒙脱土的层间距为1.47nm。经过柱撑之后,羟基铁撑蒙脱土的层间距增大到1.51n.羟基铁柱撑蒙脱+-6一MnO复合体为1.55nm左右,并且比表
2、面积较原土也有明显的增大。以亚甲基蓝为目标污染物.研究了其作为异相催化剂的催化性能,考察了溶液H202加入量、6-MnO:含量及pH值等对亚甲基蓝降解性能的影响。结果表明,在实验条件下,催化剂的催化活性随H:0浓度的增加而升高,当n=0.241时,催化活性最好,且有较大的pH适用范围。亚甲基蓝的异相催化降解过程符合准一级动力学方程。催化剂循环使用3次.仍然具有良好的活性关键词:铁柱撑蒙脱土一MnO复合体;异相催化;亚甲基蓝中图分类号:0643文献标识码:A文章编号: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
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