摘要
采用微波辅助合成方法制备了具有高光催化活性的三维球状ZnO纳米簇,通过X射线衍射(XRD)、扫描电子显微镜(SEM)、透射电子显微镜(TEM)以及氮气吸附-脱附测定等手段对材料进行了表征.结果表明,纳米ZnO具有纤锌矿晶型结构,在微波辐射作用下形成了直径约为3～4μm的球状纳米簇.该纳米簇内外结构不同,表面由尺寸均一的ZnO纳米棒紧密整齐排列,内核由许多ZnO粒子组成的层状骨架构成.该纳米簇属介孔材料,其比表面积在微波作用下显著增大.以染料罗丹明B为模型分子考察了纳米ZnO在微波辐射下的光催化活性,结果显示,微波辅助合成球状ZnO纳米簇在微波增强光催化条件下,催化活性明显高于未经微波处理的ZnO样品和市售P25,其对多种染料均有显著的降解效果,40 min内对染料(除甲基橙外)的降解率可达90%以上.
The spherical ZnO nanoclusters with high photocatalytic activity were prepared through microwave-assisted method.The samples were characterized by X-ray diffraction（XRD）,transmission electron microscopy（TEM）,scanning electron microscope（SEM）,and nitrogen adsorption/desorption determination.The results indicate that the produced ZnO has wurtzite crystal structure,and the ZnO synthesized through microwave-assisted shows spherical nanoclusters,and its diameter is at about 3—4 μm.The inside and outside of the nanoclusters are different and the epidermis is formed by closely and neatly packed uniform ZnO nano-rods,the kernel has a lots of layered frame consisted by nano ZnO particals.The material is mesoporous and has larger surface area.Photocatalytic properties of the as-synthesized ZnO were tested by the UV irradiation and the microwave enhanced photodegradation of Rhodamine B（RhB）.The results show that spherical ZnO nanoclusters synthesized by microwave-assisted exhibit higher photocatalytic activities than that of the sample no microwave irradiation in the prepared process and P25 in microwave situation.In addition,the spherical ZnO nanoclusters can degrade many kinds of dye,the degradation rates of dyes,except for methyl orange,are over 90% within 40 min.
出处
《高等学校化学学报》
SCIE
EI
CAS
CSCD
北大核心
2012年第7期1528-1533,共6页
Chemical Journal of Chinese Universities
基金
黑龙江省自然科学资金(批准号:B201106)
黑龙江省教育厅科学技术项目(批准号:12511592)
黑龙江省政府博士后资助经费(批准号:LBH-Z11108)
黑龙江省研究生创新项目(批准号:YJSCX2011-199HLJ)资助
关键词
微波辅助合成
氧化锌
纳米簇
光催化
染料
Microwave-assisted preparation
ZnO
Nanoclusters
Photocatalysis
Dye
