溶胶-凝胶燃烧法合成纳米α-Fe_(2)O_(3)粉体  

Synthesis ofα-Fe_(2)O_(3)nanocrystalline powders by sol-gel combustion method

作　　者：朱雁风[1,2] 徐盼盼 韩超 ZHU Yan-feng;XU Pan-pan;HAN Chao(School of Materials Science and Engineering,Henan University of Science and Technology,Henan University,Luoyang 471023,China;Provincial and Ministerial Co-construction of Collaborative Innovation Center for Non-ferrous Metal New Materials and Advanced Processing Technology,Henan University of Science and Technology,Henan University,Luoyang 471023,China)

机构地区：[1]河南科技大学材料科学与工程学院,河南洛阳471000 [2]河南科技大学有色金属新材料与先进加工技术省部共建协同创新中心,河南洛阳471000

出　　处：《化学研究与应用》2023年第2期451-456,共6页Chemical Research and Application

基　　金：国家自然科学基金项目(51701066)资助;河南省高等学校重点科研项目计划(18A430013)资助。

摘　　要：采用溶胶凝胶燃烧法,以Fe(NO_(3))_(3)·9H_(2)O为原料,柠檬酸为络合剂,制备出了纳米α-Fe_(2)O_(3)粉体。通过热分析(DTA/TG),X射线衍射仪(XRD),扫描电镜(SEM),透射电镜(TEM),红外光谱(IR)和X射线光电子能谱(XPS)检测方法进行检测分析,探讨了影响燃烧的因素和纳米粉体的性能。结果表明,当金属离子与柠檬酸比例为1:1,pH=3-5时制备的干凝胶,在300℃引燃,可以充分燃烧。凝胶燃烧完成后在500℃煅烧1小时,可以得到尺寸大小在40-50 nm左右的高分散纳米α-Fe_(2)O_(3)粉体。制备出的纳米α-Fe_(2)O_(3)粉体具有优异光催化性能,降解初始浓度为10 mg/L的罗丹明B溶液时,纳米α-Fe_(2)O_(3)粉体最佳投入量为0.5 g/L。α-Fe_(2)O_(3)nanocrystalline powders were prepared by sol-gel combustion method with Fe(NO3)3·9H2O as raw materials and citric acid as complexing agent.The factors affecting combustion and the properties of nano-powder were discussed by means of thermal analysis(DTA/TG),X-ray diffraction(XRD),scanning electron microscopy(SEM),transmission electron microscopy(TEM),infrared spectroscopy(IR)and X-ray photoelectron spectroscopy(XPS).The results shows when the ratio of metal ions to citric ions is 1:1 and pH=3-5,the dry gel can fully combusted when the ignited temperature is 300℃.After the gel combustion was completed,the highly dispersed nano-sizedα-Fe_(2)O_(3)powders with sizes of about 40-50 nm could be obtained by holding the gel at calcination temperature 500℃for 1h.?The prepared nanometerα-Fe_(2)O_(3)powder has excellent photocatalytic activity,the optimal dosage was 0.5g/L of Rhodamine B solution with theinitial concentration of 10mg/L.

关 键 词：α-Fe_(2)O_(3) 溶胶凝胶自蔓延法 纳米粉体 光催化 

分 类 号：O614.8[理学—无机化学]