纳米结构ε-MnO_2的制备及催化分解苯酚  

Preparation of Nanostructured ε-MnO_2 and Its Catalysis of Phenol Decomposition

作　　者：张卫新[1] 汪芳[1] 杨则恒[1] 陈敏[1] 毕超[1] 

机构地区：[1]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,合肥230009

出　　处：《应用化学》2008年第10期1151-1155,共5页Chinese Journal of Applied Chemistry

基　　金：国家自然科学基金(20576024);安徽省自然科学基金(070414165)资助项目

摘　　要：以KMnO4和MnSO4为原料、于室温条件下制备了纳米晶须组装的ε-MnO2球。采用X射线粉末衍射(XRD)、透射电子显微镜(TEM)和比表面积(BET法)测试技术对样品进行了分析表征。探索了ε-MnO2在催化氧化苯酚模拟废水中的应用。结果表明,催化反应过程条件温和,不用外加氧化剂。利用荧光光谱(FL)表征了苯酚的分解过程。结果显示,ε-MnO2对苯酚有很好的分解效果,在80 min时苯酚的去除率达80.4%。荧光光谱分析表明,苯酚分解过程中产生了具有荧光性质的中间产物,并通过高效液相色谱(HPLC)对其中间产物进一步验证,提出了苯酚分解的可能路径。动力学研究表明,以纳米结构ε-MnO2为催化剂催化分解苯酚的反应级数a=1.64,反应速率常数k=0.007 5(mg·L-1)-0.64/min。Nanostructured ε-MnO2 made up of its nanowhiskers was successfully prepared with KMnO4 and MnSO4 as the raw materials at room temperature.X-ray diffraction（XRD）,transmission electron microscopy（TEM） and specific surface area（BET） were used to characterize the product.The as-prepared nano-structured ε-MnO2 was used as a catalyst to decompose simulated phenol wastewater.This catalytic reaction was mild and required any oxidant.Based on fluorescence spectroscopy（FL） results,the removal of phenol was up to 80.4% within 80 min.The intermediate products during the degradation process of phenol were investigated with high performance liquid chromatography（HPLC）.The possible decomposition path of phenol was proposed.Kinetic study of the catalytic reaction showed that the reaction kinetics order was 1.64 and the reaction rate constant was 0.007 5（mg·L^-1）-0.64/min.

关 键 词：纳米结构ε-MnO2 苯酚 催化 荧光光谱 

分 类 号：O611.4[理学—无机化学] O643.3[理学—化学]