不同熔盐体系制备CeO_(2)及光催化性能研究  

Photocatalytic Property of CeO_(2) Synthesized in Different Molten Salt Systems

作　　者：王伟 储智尧 王远 田维浩 张登卫 张桥浪 兰苑培 WANG Wei;CHU Zhi-yao;WANG Yuan;TIAN Wei-hao;ZHANG Deng-wei;ZHANG Qiao-lang;LAN Yuan-pei(College of Materials and Metallurgy,Guizhou University,Guiyang 550025,China;Guizhou Province Key Laboratory of Metalurgical Engineering and Process Energy Saving,Guiyang 550025,China)

机构地区：[1]贵州大学材料与冶金学院,贵州贵阳550025 [2]贵州省冶金工程与过程节能重点实验室,贵州贵阳550025

出　　处：《稀土》2024年第4期53-63,共11页Chinese Rare Earths

基　　金：国家自然科学基金项目(52164025,51804088)。

摘　　要：研究了K_(2)CO_(3)/Li_(2)CO_(3)、LiCl/KCl、CaCl_(2)/NaCl、CaCl_(2)/KCl及NaCl/KCl五种熔盐体系熔盐法制备CeO_(2)的光催化性能。结果表明,各熔盐体系制备的CeO_(2)光催化性能遵循K_(2)CO_(3)/Li_(2)CO_(3)>LiCl/KCl>CaCl_(2)/NaCl>CaCl_(2)/KCl>NaCl/KCl,其中最优光催化性能达到光照120 min对亚甲基蓝(MB)的降解率为95.91%。以该熔盐体系制备的CeO_(2)为研究对象,考察了溶液pH=4~10及反应温度为25℃~65℃对CeO_(2)光催化降解亚甲基蓝性能的影响,发现随反应温度升高CeO_(2)的光催化性能先升后降,当反应温度为45℃时,反应120 min后MB降解率达99.90%;溶液pH升高,MB的降解率呈上升趋势,当pH=10时反应120 min后MB降解率为99.36%;结合最优反应温度及反应pH,CeO_(2)对MB的降解效率得到进一步提升,光照条件下反应120 min对MB的降解为99.99%,速率常数k=0.03964 min^(-1)。In this work,the photocatalytic properties of ceria which synthesized in K_(2)CO_(3)/Li_(2)CO_(3),LiCl/KCl,CaCl_(2)/NaCl,CaCl_(2)/KCl and NaCl/KCl molten salt systems were investigated.The results show that the photocatalytic performance of CeO_(2) is synthesized by the molten salt method follows K_(2)CO_(3)/Li_(2)CO_(3)>LiCl/KCl>CaCl_(2)/NaCl>CaCl_(2)/KCl>NaCl/KCl,the best degradation ratio of methylene blue(MB)in 120 mins is measured as 95.91%.Taking CeO_(2) sythesized in the molten salt systems as the research object,the effects of pH=4~10 and reaction temperature of 25℃~65℃on the photocatalytic degradation of methylene blue by CeO_(2) were investigated.Results show that with the rise of photocatalytic temperature,the catalytic activity of ceria was promoted firstly and then trended to decrease.Ceria presented the best catalytic property at 45℃with the MB reached 99.9%after 120 mins of reaction.Besides,the MB degradation rate continually increased with the elevation of solution pH,and the MB degradation rate was 99.36%after 120 min when the pH=10.Combined with the optimal reaction temperature and pH,the degradation efficiency of CeO_(2) on MB was further improved;The degradation rate of MB was 99.99%after 120 mins,k=0.03964 min^(-1).

关 键 词：熔盐法 CeO_(2) 光催化 温度 PH 

分 类 号：TQ174[化学工程—陶瓷工业]