摘要
采用溶胶凝胶和高温煅烧相结合的方法制备了Co_(3)O_(4)/Fe_(3)O_(4)复合纳米材料,通过调节前驱体中Co(NO_(3))_(2)•6H_(2)O和Fe(NO_(3))_(3)•9H_(2)O的浓度可以调节Co_(3)O_(4)/Fe_(3)O_(4)中两组分的含量,通过改变煅烧温度可以改变Co_(3)O_(4)/Fe_(3)O_(4)的晶粒尺寸。利用XRD、SEM、XPS和N_(2)吸附脱附等测试技术对Co_(3)O_(4)/Fe_(3)O_(4)复合材料的物相、形貌和结构进行了表征。热催化结果表明:随着Fe_(3)O_(4)与Co_(3)O_(4)摩尔比的增加,Co_(3)O_(4)/Fe_(3)O_(4)复合材料热催化降解异丙醇(IPA)的活性不断增强,当Fe_(3)O_(4)与Co_(3)O_(4)的摩尔比为0.5∶1且煅烧温度达到500℃时,复合材料表现出最高的热催化活性和较好的稳定性。形成的Co_(3)O_(4)/Fe_(3)O_(4)异质结在热催化氧化还原反应中促进了电子和空穴的分离,并且在材料表面生成了•O_(2)^(-)自由基,可进一步与IPA发生氧化反应,最终实现IPA的高效降解。
In this paper,Co_(3)O_(4)/Fe_(3)O_(4) composite nanomaterials were prepared by sol-gel reaction and high temperature calcination method.By adjusting the concentration of Co(NO_(3))_(2)•6H_(2)O and Fe(NO_(3))_(3)•9H_(2)O in precursor,the content of two components in Co_(3)O_(4)/Fe_(3)O_(4) can be adjusted,and the grain size of Co_(3)O_(4)/Fe_(3)O_(4) can be changed by changing calcination temperature.The phase,morphology,and structure of Co_(3)O_(4)/Fe_(3)O_(4) composites were characterized by XRD,SEM,XPS and N_(2) adsorption desorption measurement.The results of thermal catalysis showed that with the increase of the molar ratio of Fe_(3)O_(4) to Co_(3)O_(4),the thermal catalytic activity of Co_(3)O_(4)/Fe_(3)O_(4) composites for isopropanol(IPA)degradation was continuously enhanced.When the molar ratio of Fe_(3)O_(4) to Co_(3)O_(4) was 0.5:1 and the calcination temperature reach 500℃,the composites showed the highest thermal catalytic activity and better stability.The Co_(3)O_(4)/Fe_(3)O_(4) heterojunction could promote the separation of electrons and holes in the thermal catalytic redox reaction,and generated•O_(2)^(-)radicals on the material surface,which could further oxidize with IPA,and finally realized the efficient degradation of IPA.
作者
金雨玲
李林丽
刘亚靖
陶然
马静怡
孙浩
张美霞
范晓星
JIN Yuling;LI Linli;LIU Yajing;TAO Ran;MA Jingyi;SUN Hao;ZHANG Meixia;FAN Xiaoxing(School of Physics,Liaoning University,Shenyang 110036,China;Liaoning Key Laboratory of Semiconductor Light Emitting and Photocatalytic Materials,Liaoning University,Shenyang 110036,China)
出处
《功能材料》
CAS
CSCD
北大核心
2023年第8期8157-8162,8171,共7页
Journal of Functional Materials
基金
国家自然科学基金(21773099)
辽宁省自然科学基金(2022-MS-170,2022-BS-108)
沈阳市中青年科技创新人才支持计划(RC200261)。
