系列纳米结构锰氧化物的水热合成.doc

系列纳米结构锰氧化物的水热合成
无机化学学报(CHINESE JOURNAL OF ANIC CHEMISTRY)
杨则恒* 周晨旭宋新民张卫新单天军张娜
(合肥工业大学化工学院,可控化学与材料化工安徽省重点实验室,安徽合肥
230009)
摘要: 以KMnO4为锰源、抗坏血酸(AA)为还原剂,采用水热法制备系列纳米结构锰氧化物。通过调节反应物的摩尔比、水溶液的pH值、反应温度和反应时间,成功制备出不同纳米结构的锰氧化物,包括Mn3O4纳米粒子、MnOOH、α-MnO2 和β-MnO2纳米棒。采用XRD和TEM测试技术对合成产物进行了表征,同时对其反应机理进行了探讨。
关键词:水热法;纳米结构锰氧化物;氧化还原反应;机理
essful synthesis of various nanostructured manganese oxides
via a facile hydrothermal reaction
YANG Ze-Heng* ZHOU Chen-Xu SONG Xin-Min ZHANG Wei-Xin
SHAN Tian-Jun ZHANG Na
(School of Chemical Engineering, Hefei University of Technology and Anhui Key Laboratory of Controllable Chemical Reaction & Material Chemical Engineering,
Hefei, Anhui 230009)
Abstract: A versatile hydrothermal reaction between KMnO4 and ascorbic
acid (AA) was developed to synthesize an important kind of anic functional materials—pounds. A variety of nanostructured manganese oxides including Mn3O4 nanoparticles, MnOOH, α-MnO2 and β-MnO2 nanorods have been essfully prepared through adjusting the molar ratio of the reactants, pH value of the aqueous solution, reaction temperature and reaction 收稿日期: 收修改稿日期:
国家自然科学基金()和安徽省自然科学基金()资助项目。* 通讯联系人。E-mail: 第一作者:杨则恒,男,47岁,博士,副教授;研究方向:无机纳米功能材料合成及应用
无机化学学报(CHINESE JOURNAL OF ANIC CHEMISTRY)
time. The obtained products were characterized by X-ray powder diffraction (XRD) and transmission electron microscopy (TEM). The possible reaction mechanism was discussed. Key Words: Hydrothermal method;nanostructured manganese oxides;redox reaction; mechanism
1. Introduction
Transitional metal manganese element can exist in multiple oxidation states ranging from +2 to +7, and gives to a plex oxides system, with the most usual stoichiometrics MnO, Mn3O4, Mn2O3, MnO(OH) (oxyhydroxide) and MnO2. Moreover, these manganese oxides have polymorphic forms. It has been found that manganese oxides are of considerable importance in technological applications including ion-exchange, molecular adsorption, cataly