β-MnO_2纳米棒催化H_2O_2降解刚果红的研究  

Study on the Catalytic Degradation of Congo Red by β-MnO_2 Nanorods

作　　者：叶蕾[1] 杨玉梅[1] 祝啸[1] 唐国睿[1] 

机构地区：[1]合肥工业大学化学工程学院,安徽合肥230009

出　　处：《安徽化工》2012年第4期16-20,共5页Anhui Chemical Industry

摘　　要：采用热分解纳米结构γ-MnOOH前驱体制备出直径约200 nm、长度接近几十微米的β-MnO2纳米棒,通过XRD和TEM对产物进行了成分与形貌表征。β-MnO2纳米棒作为催化剂对H2O2分解刚果红具有良好的催化性能。实验研究了刚果红初始浓度、H2O2浓度和催化剂用量对刚果红脱色率的影响。进一步研究表明,β-MnO2纳米棒催化H2O2氧化降解刚果红的脱色反应属于2.44级动力学反应,反应速率常数为0.002834(mol/L)-1.44.min-1。经紫外-可见光谱、红外光谱分析表明,催化反应后刚果红分子结构遭到破坏。In this paper,β-MnO2 nanorods with diameters of about 200 nm and length of tens of micrometers were synthesized by thermal decomposition of γ-MnOOH nanorods precursor.The samples were characterized by the X-ray powder diffraction（XRD） and transmission electron microscopy（TEM）.The as-prepared β-MnO2 nanorods showed good catalytic performance when used as catalyst to degrade Congo Red with the presence of H2O2.The effects of the reacting conditions on the decoloration rate of Congo Red solution were investigated,such as initial Congo Red concentration,H2O2 concentration and catalyst dosage.Further research showed that with β-MnO2 nanorods as the catalyst the decoloration rate of Congo Red solution followed 2.44-order kinetics and the reaction rate constant was 0.002834（mol/L）-1.44 min-1.UV-vis and FTIR results indicate that Congo Red could have been decomposed.

关 键 词：β-MnO2纳米棒 催化 H2O2 降解 刚果红 

分 类 号：TB383[一般工业技术—材料科学与工程] TU411.01[建筑科学—岩土工程]