摘要
目的以Ta2O5和KCl为原料,制备高温相K6Ta10.8O30棒状粒子,探究合成条件对其形成的影响。方法采用熔盐法合成高温相K6Ta10.8O30棒状粒子,利用XRD,FE-SEM,EDX等分析手段对合成产物的形貌、化学组成及晶相结构进行表征,研究了反应温度和反应时间对形成高温相K6Ta10.8O30棒状粒子的影响。结果Ta/K摩尔比为0.011,在1200℃反应2 h,可制得纯相且形貌规整的K6Ta10.8O30棒状粒子,粒径约4μm,长约44μm。结论在KCl—Ta2O5二元体系的反应中,可得到低温相K2Ta4O11和高温相K6Ta10.8O302种产物,适当地提高反应温度相较于延长反应时间更有利于高温相K6Ta10.8O30棒状粒子的形成。合成样品掺杂Ag之后,在模拟太阳光照射下,高温相Ag-K6Ta10.8O30比低温相Ag-K2Ta4O11样品具有较高的可视光催化活性。
Purposes—To prepare high-temperature phase K6Ta10.8O30 rod-like particles with tantalum pentoxide and potassium chloride as raw materials,and explore the influence of synthesis conditions on the particle formation.Methods—K6Ta10.8O30 rod-like particles were synthesized with molten-salt growth method.The effects of the temperature and time of calcination on the formation of K6Ta10.8O30 rod-like particles were investigated by characterizing crystal structure,morphology and chemical components of the synthesized samples with XRD,FE-SEM and EDX.Result—K6Ta10.8O30 rod-like particles can be prepared when synthesis conditions are that the molar ratio of Ta to K is 0.011 and the temperature and time of reaction is 1200℃and 2 hours respectively.These particles are about 44μm in length and 4μm in diameter.Conclusion—Two products,K2Ta4O11 and K6Ta10.8O30,can be obtained in the reaction of KCl-Ta2O5 binary system.Appropriately raising the reaction temperature is more conducive to the formation of high temperature phase K6Ta10.8O30 rod-like particles than prolonging the reaction time.After doping the synthesized samples with Ag,the high temperature phase Ag-K6Ta10.8O30 has higher visible photocatalytic activity than that of low temperature phase Ag-K2Ta4O11 under simulated solar irradiation.
作者
兰玉竹
王川川
蒋晓文
贺倩
温普红
LAN Yu-zhu;WANG Chuan-chuan;JIANG Xiao-wen;HE Qian;WEN Pu-hong(College of Chemistry and Chemical Engineering, Baoji University of Arts and Sciences, Baoji 721013, Shaanxi, China)
出处
《宝鸡文理学院学报（自然科学版）》
CAS
2020年第1期35-41,共7页
Journal of Baoji University of Arts and Sciences(Natural Science Edition)
基金
国家自然科学基金面上项目(21173003)。
关键词
高温相K6Ta10.8O30棒状粒子
熔盐法
合成条件
光催化性能
high temperature phase K6Ta10.8O30 rod-like particles
molten-salt growth method
synthetic conditions
photocatalytic performance
