微波法合成介孔WO_3·NiO·0.33H_2O及光催化降解气相甲醛  

Synthesis of mesoporous WO_3·NiO·0.33H_2O using microwave irradiation method and photocatalytic degradation of gaseous formaldehyde

作　　者：邹丽霞[1,2] 刘庆成[1] 董丽君[1] 徐琼[1] 熊小青 

机构地区：[1]东华理工大学化学生物材料学院,江西抚州344000 [2]北京化工大学化工过程资源有效利用国家重点实验室,北京100029

出　　处：《材料热处理学报》2009年第6期41-46,共6页Transactions of Materials and Heat Treatment

基　　金：江西省自然科学基金(BK2007060);化工过程资源有效利用国家重点实验室开放课题(2008-03)

摘　　要：以复合表面活性剂为模板,采用微波辐射、二甲苯萃取脱除模板剂法制备了介孔材料WO3.0.33H2O、WO3.NiO.0.33H2O,利用XRD、TGA、TEM、BET等手段表征了材料的结构、形貌、比表面积、孔径分布。结果表明,微波辐射比传统加热法制备的材料晶粒小,结晶度高,孔径分布更均匀,比表面积更大;制备的材料WO3.NiO.0.33H2O介孔呈现蠕虫状,掺杂Ni2+能稳定介孔结构,抑制晶粒长大,其比表面积达66.37m2.g-1。分别以WO3.NiO.0.33H2O催化剂考察在紫外光(UV)、黑光灯、可见光3种光源下对气相甲醛光催化降解反应动力学规律及紫外光下的催化稳定性,其光催化降解气相甲醛降解率为传统加热法样品的3倍,在可见光下达76.8%。Using composite surfactant as template-directing agent,WO3·0.33H2O、WO3·NiO·0.33H2O mesoporous materials were synthesized by microwave irradiation and then extraction with dimethylbenzene solution to remove the surfactant species.The properties of the materials were investigated by means of XRD,TGA,TEM and BET.The results show that the materials synthesized by microwave irradiation exhibit smaller crystallite size,uniform pore size distribution,larger specific surface area compared with those by conventional heating methods.The WO3·NiO·0.33H2O prepared have the worm holelike mesoporous structure,which can be stabilized and its crystallite size can be controlled by doping with transition metals Ni^（2＋）.Specific surface area of the material is 66.37 m^2·g^（-1）.The reaction kinetics laws of photocatalytic degradation of gaseous formaldehyde were studied under irradiation of ultraviolet（UV）,black light lamp and visible light,respectively,and the stability of the photocatalysts in ultraviolet light were checked.The photodegradation efficiency for gas-phase formaldehyde of WO3·NiO·0.33H2O is 3 times as large as that of WO3·H2O which is prepared by conventional heating methods in ultraviolet light and is 76.8% in visible light.

关 键 词：微波辐射 介孔 WO3.0.33H2O 掺杂Ni2+ 光催化 

分 类 号：TQ012[化学工程] X703[环境科学与工程—环境工程]