基于MCM-41模板制备β-MnO_2纳米纤维及其催化降解亚甲基蓝染料  

Synthesis of β-MnO_2 Nanofibers Based on MCM-41 Template and Their Catalytic Decomposition of Methylene Blue Dye

作　　者：杨则恒[1] 李红艳[1] 张卫新[1] 

机构地区：[1]合肥工业大学化学工程学院,可控化学与材料化工安徽省重点实验室,合肥230009

出　　处：《高等学校化学学报》2010年第6期1108-1112,共5页Chemical Journal of Chinese Universities

基　　金：国家自然科学基金(批准号:20871038,20876031,20976033);安徽省教育厅资助项目(批准号:TD200702,KJ2008B21Z)资助

摘　　要：以介孔氧化硅材料MCM-41为模板,硝酸锰为锰源,通过浸渍、450℃焙烧4 h得到Mn-MCM-41,用NaOH溶液溶解除去氧化硅模板得到锰氧化物,采用XRD,HRTEM和N2吸附-脱附等测试技术对产物进行了表征.结果表明,所得产物是纯相的β-MnO2纳米纤维,直径小于3 nm.纳米纤维之间有序排列组成类似MCM-41模板的介孔结构,其比表面积达到136.5 m2/g.将所制备的β-MnO2纳米纤维用于催化过氧化氢氧化分解质量浓度为60 mg/L的亚甲基蓝(MB)模拟染料废水,经100 min反应后,亚甲基蓝水溶液脱色率达到97.59%.所制备的催化剂对降解处理高浓度亚甲基蓝溶液,具有降解脱色率高和反应速度快等优点.β-MnO2 nanofibers were successfully prepared based on MCM-41 mesoporous template.Firstly,Mn-MCM-41 was synthesized by impregnating mesoporous MCM-41 template with an aqueous ethanol solution of Mn（NO3）2 and heating at 450 ℃ for 4 h under air,and then the manganese oxide was obtained through dissolving the MCM-41 template with NaOH solution.Through X-ray diffraction,high resolution transmission electron microscopy and N2 adsorption and desorption isotherm characterizations,the as-prepared manganese oxide was shown to be the pure phase of β-MnO2 nanofibers with diameters less than 3 nm.These ordered β-MnO2 nanofibers formed a mesoporous structure similar to the MCM-41 template,with a high surface area of 136.5 m2/g.We demonstrated the high catalytic efficiency of β-MnO2 nanofibers as catalyst in the oxidation of methylene blue（MB） dye with H2O2.The decoloration rate of 60 mg/L MB solution reached 97.59% within 100 min,indicating that the catalyst can degrade high concentration of MB solution efficiently.

关 键 词：MCM-41 模板 β-MnO2 纳米纤维 催化 

分 类 号：O614.7[理学—无机化学]