钛酸铋微米球的合成、晶型调控及光催化性能表征  

Synthesis,Crystal Structure Control and Photocatalytic Propertiesof Bismuth Titanate Microspheres

作　　者：赵巍 郭晶晶 荣嘉诚 王虎刚 张琪 汪恒 杨现锋 ZHAO Wei;GUO Jingjing;RONG Jiacheng;WANG Hugang;ZHANG Qi;WANG Heng;YANG Xianfeng(School of Materials Science and Engineering,Tianjin Chengjian University,Tianjin 300384,China;Tianjin Key Laboratory of Building Green Functional Materials,Tianjin 300384,China;College of Materials Science and Engineering,Changsha University of Science and Technology,Changsha 410114,Hunan,China)

机构地区：[1]天津城建大学材料科学与工程学院,天津300384 [2]天津市绿色功能材料建设重点实验室,天津300384 [3]长沙理工大学材料科学与工程学院,湖南长沙410114

出　　处：《陶瓷学报》2020年第2期213-218,共6页Journal of Ceramics

基　　金：天津市自然科学基金(18JCYBJC87600)。

摘　　要：以微米级TiO2球为模板和反应物,Bi(OH)3为铋源,采用软化学转换的方法,水热合成钛酸铋微球。通过调整水热工艺参数,结合XRD等测试表征手段,探究了不同晶相的生成机理。结果表明,矿化剂浓度、Bi/Ti摩尔比以及水热温度和后期热处理温度均对合成材料的晶型产生较大影响,增加KOH矿化剂的浓度和Bi/Ti摩尔比有利于生成Bi(12)TiO(20)晶相,增加水热温度以及结合后期热处理有利于生成Bi4Ti3O(12)晶相。在水热温度140℃,水热时间12h,KOH浓度1.0 mol/L,Bi/Ti摩尔比1︰3,经过750℃的热处理条件下,可生成微米级球状Bi4Ti3O(12),禁带宽度为3.0 eV,具有优良的光催化降解污染物特性。Bismuth titanate micro spheres were prepared by using hydrothermal reaction and soft chemistry transformation with TiO2 micro spheres as both templates and reactants and Bi(OH)3 as the source of bismuth.By adjusting the hydrothermal process parameters and combining with XRD and other characterization methods,the formation mechanisms of different crystal phases were clarified.It was found that the mineralizer concentration,Bi/Ti molar ratio,hydrothermal reaction temperature and post-heat treatment temperature all played important roles in determining morphology of the crystals.High concentration of KOH mineralizer and high molar ratio of Bi/Ti were favorable for the formation of the Bi12Ti02o,while high hydrothermal reaction temperature resulted in the formation of Bi4Ti3Oi2.The optimal parameters included hydrothermal reaction temperature of 140℃,reaction time of 12 h,KOH concentration of 1.0 mol/L,Bi/Ti molar ratio of 13 and heat treatment temperature of 750℃,which led to Bi4Ti30i2 with a band gap of 3.0 eV exhibiting excellent photocatalytic degradation performances.

关 键 词：软化学 Bi4Ti3O(12) Bi(12)TiO(20) 光催化 

分 类 号：TQ174.75[化学工程—陶瓷工业]