摘要
通过熔盐法制备了片状Bi5Ti3FeO15纳米粉体。研究了反应原料中氧化物/盐的摩尔比对粉体结构和形貌的影响。采用XRD,SEM,UV-vis等一系列测试手段,对所制备样品的物相结构、微观形貌、以及光学性能等进行了表征。以罗丹明B为目标降解物,在模拟太阳光的照射下,探究了所合成样品的光催化活性。结果表明,反应原料中氧化物/盐的摩尔比为1︰8的条件下所制备的Bi5Ti3FeO15粉体具有最佳的光催化性能。在反应系统中加入和不加入1mmol/L的H2O2的条件下,120min内对罗丹明B的去除率分别为97.7%和45.9%。捕获实验测试结果表明,在光催化降解罗丹明B的过程中,光诱导产生的h+起主要作用,而超氧自由基(·O2^-)和羟基自由基(·OH)在降解过程中起次要作用。
Pure phase plate-like Bi5Ti3FeO15 nanopowders were synthesized by molten salt method.The influence of molar ratio of metal oxide/salt in the raw materials on the phase structure and morphology were investigated.The phase structure,morphology,and optical property of these samples were characterized by XRD,SEM,UV-vis spectroscopy,respectively.The photocatalytic performances of the samples were evaluated by the degradation of Rhodamine B under simulated solar light irradiation.The results show that Bi5Ti3FeO15 nanoplates synthesized with the molar ratio of 1︰ 8 of the metal oxide/salt with the best photocatalytic efficiency.With the addition of 1mol/L H2O2 or not in the solution,97.7%and 45.9%of Rhodamine B was degraded under 120 min simulated solar light irradiation.Furthermore,the results of the scavenger experiments measurements reveal that photogenerated h+species play the most critical role,·O2^-and·OH radical serve as a secondary active species in the degradation process of RhB dyes.
作者
何秉洋
高健智
李世平
尹亚萍
饶斐
He Bingyang;Gao Jianzhi;Li Shiping;Yin Yaping;Rao Fei(School of Physics and Information Technology,Shaanxi Normal University,Xi’an 710119,China)
出处
《广东化工》
CAS
2019年第11期4-6,共3页
Guangdong Chemical Industry
关键词
半导体
光催化
熔盐法
semiconductor
photocatalytic
molten salt method
