新型纳米ZnO@SiO_2光催化剂降解苯酚溶液的研究  

Preparation of novel ZnO@SiO_2 nanoparticles and their photocatalytic degradation of phenol

作　　者：翟晶[1] 陶霞[1] 蒲源[1] 邹海魁[1] 陈建峰[1] 

机构地区：[1]北京化工大学纳米材料先进制备技术与应用科学教育部重点实验室,北京100029

出　　处：《北京化工大学学报（自然科学版）》2011年第5期6-9,共4页Journal of Beijing University of Chemical Technology(Natural Science Edition)

基　　金：国家"863"计划(2009AA033301)

摘　　要：通过化学沉淀、水热反应、煅烧过程制备了新型ZnO@SiO2光催化剂,采用X射线衍射(XRD)、电子透射电镜(TEM)、能谱分析(EDS)、比表面测定实验等手段对产物结构和形貌进行了表征。结果表明,产物为核壳结构的ZnO@SiO2复合颗粒,粒径约为20 nm,表面包覆有3 nm左右的SiO2壳层。以苯酚为目标降解物,研究新型ZnO@SiO2复合材料在不同pH值溶液中的光催化性能。光催化降解实验结果表明,在酸性(pH 5.82,.8)或碱性(pH8.3,12.4)溶液中,ZnO对苯酚的光催化降解率小于10%,而新型核壳结构ZnO@SiO2对苯酚的降解率显著高于ZnO,核壳结构明显改善了光催化剂的稳定性。A novel core-shell ZnO@ SiO2 photocatalyst has been synthesized by chemical precipitation, hydrothermal reaction and calcination. The resulting composite particles were characterized by transmission electron micros- copy （TEM）, X-ray diffraction （XRD）, energy dispersive spectrometry （EDS） and surface area measurements. The results showed that the product consisted of core-shell ZnO@ SiO2 nanoparticles with a core size of 20 nm coated with 3 nm SiO2 thin shells. The photocatalytic performance of ZnO@ SiO2 in aqueous solutions of phenol at varying pH values was investigated. While the photocatalytic degradation of phenol by ZnO was less than 10% , the photo- catalytic performance of the composite ZnO@ SiO2 particles in both acidic （pH = 5.8, 2. 8） and alkaline （ pH = 8.3, 12.4） solutions of phenol was superior, which suggests they have potential wide applications in pollutant treatment.

关 键 词：核壳结构 复合材料 光催化剂 苯酚 

分 类 号：TB383[一般工业技术—材料科学与工程]