基于MCM-41模板制备β-MnO2纳米纤维及其催化降解亚甲基蓝染料

高等学校化学学报 ›› 2010, Vol. 31 ›› Issue (6): 1108.

基于MCM-41模板制备β-MnO₂纳米纤维及其催化降解亚甲基蓝染料

杨则恒, 李红艳, 张卫新

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

收稿日期:2009-10-14 出版日期:2010-06-10 发布日期:2010-06-10
通讯作者: 杨则恒, 男, 教授, 主要从事无机功能材料制备与催化性能研究. E-mail: yangzh0219@sina.com
基金资助:
国家自然科学基金(批准号: 20871038, 20876031, 20976033)和安徽省教育厅资助项目(批准号: TD200702, KJ2008B21Z)资助.

Synthesis of β-MnO₂ Nanofibers Based on MCM-41 Template and Their Catalytic Decomposition of Methylene Blue Dye

YANG Ze-Heng*, LI Hong-Yan, ZHANG Wei-Xin

Key Laboratory of Controllable Chemistry Reaction & Material Chemical Engineering of Anhui Province, School of Chemical Engineering, Hefei University of Technology, Hefei 230009, China

Received:2009-10-14 Online:2010-06-10 Published:2010-06-10
Contact: YANG Ze-Heng. E-mail: yangzh0219@sina.com
Supported by:
国家自然科学基金(批准号: 20871038, 20876031, 20976033)和安徽省教育厅资助项目(批准号: TD200702, KJ2008B21Z)资助.

摘要/Abstract

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.

关键词: MCM-41; 模板; β-MnO2; 纳米纤维; 催化

Abstract:

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.

Key words: MCM-41; Template; β-MnO2; Nanofibers; Catalysis

TrendMD:

杨则恒, 李红艳, 张卫新. 基于MCM-41模板制备β-MnO₂纳米纤维及其催化降解亚甲基蓝染料. 高等学校化学学报, 2010, 31(6): 1108.

YANG Ze-Heng*, LI Hong-Yan, ZHANG Wei-Xin. Synthesis of β-MnO₂ Nanofibers Based on MCM-41 Template and Their Catalytic Decomposition of Methylene Blue Dye. Chem. J. Chinese Universities, 2010, 31(6): 1108.

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基于MCM-41模板制备β-MnO₂纳米纤维及其催化降解亚甲基蓝染料

Synthesis of β-MnO₂ Nanofibers Based on MCM-41 Template and Their Catalytic Decomposition of Methylene Blue Dye

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