摘要
针对微波常压水热法,通过增设热管快速冷却而提高温度稳定段微波能量制备纳米氧化锌,以探究温稳段微波辐射能量增加对合成ZnO的影响,并在此基础上添加不同表面活性剂(柠檬酸钠、草酸钠)制备ZnO探究其性能。利用X射线衍射(XRD),扫描电子显微镜(SEM),紫外-可见光漫反射和降解罗丹明B的光催化实验对样品结构和性能进行表征。结果表明,随着温稳段微波能量增加,ZnO明显偏向片状结构,其光学带隙最大可减少0.13 eV,表现出对高功率下微波能量变化的敏感,进一步添加表面活性剂形成三维ZnO结构,以草酸钠为表面活性剂的ZnO吸光峰红移明显。光催化实验表明,同功率下,提高微波辐射能量制备的ZnO在90 min后降解率可提高20%,表面活性剂草酸钠制备的ZnO120 min内降解率可达到99%以上,表现出优异的光催化性能。
Nano zinc oxide was prepared by microwave hydrothermal method under atmospheric pressure in a novel microwave reactor with cooling heat pipe for process microwave radiation energy added in the stable temperature section.The effect of microwave radiation energy increased on the synthesis of ZnO was investigated.On this basis,different surfactants(sodium citrate and sodium oxalate)were added to prepare ZnO to explore its performance.The structure and properties of the samples were characterized and analyzed by X-ray diffraction(XRD),scanning electron microscopy(SEM),ultraviolet-visible diffuse reflectance and the photocatalyticdeg-radation of Rhodamine B.The results showed that with the increase of microwave energy during the stable temperature period,the morphology of ZnO nanoparticles was obviously inclined to sheet structure,and the optical band gap of ZnO could be reduced by 0.13 eV at most,which was sensitive to the change of microwave energy under high power.Further addition of surfactant was benefit for forming three-dimensional ZnO structure,and the wavelength of absorbance peak of ZnO prepared with sodium oxalate was obviously increased.The photocatalytic experiment showed that under the same power,the degradation rate of ZnO prepared by increasing the microwave radiation energy could be increased by 20%after 90 min.The zinc oxide prepared by sodium oxalate had excellent photocatalytic performance,and the degradation rate could reach over 99%within 120 min.
作者
尉金枝
卫灵君
崔政伟
WEI Jinzhi;WEI Lingjun;CUI Zhengwei(School of Mechanical Engineering, Jiangnan University, Wuxi 214122, China)
出处
《功能材料》
EI
CAS
CSCD
北大核心
2020年第7期7097-7103,共7页
Journal of Functional Materials
基金
国家自然科学基金资助项目(21606109)
江苏省研究生科研与实践创新计划资助项目(SJCX19_0786)。
关键词
纳米ZNO
微波
催化降解
nano-zinc oxide
microwave
catalyticdegradation
