摘要
以铋酸钠、碘化钾和盐酸为原料,无水乙醇为分散剂,采用氧化还原法合成了具有高可见光催化活性的氯氧化铋(BiOCl)催化剂,采用XRD,TEM,HRTEM,XPS,UV-Vis DRS等手段对其组成、形貌和光学吸收性能进行了表征。以罗丹明B(RhB)为目标降解物,考察了BiOCl催化剂在可见光下的光催化活性及动力学行为。表征结果显示,BiOCl为片层纳米粉体,暴露晶面为(012)晶面;与常规方法制备的BiOCl相比,其吸收带边明显红移,禁带宽度变窄(为2.3 eV)。光催化降解RhB的实验结果表明,BiOCl光催化降解RhB反应表现为假一级动力学,且其光催化活性优于常规BiOCl和P25催化剂。BiOCl催化剂具有较高的光热稳定性,重复使用4次后,RhB的降解率变化不明显,仍可达到95.0%。
BiOC1 powder was prepared by a redox method from NaBiO3, KI and HC1 with absolute ethyl alcohol as the dispersant. The structure, morphology and optical properties of the prepared BiOC1 were characterized by means of XRD, TEM, HRTEM, XPS and UV-Vis DRS. The photocatalytic activity and kinetics of the BiOC1 for the degradation of Rhodamine B（RhB） under visible light were investigated. The characterization results indicated that the prepared BiOC1 was nanopowder with layer-structure and the exposed crystal faces were （012）. The BiOC1 has a significant red-shift in the absorption band and the width of its forbidden band is narrower （2.3 eV） than that of conventional BiOC1. The photocatalytic reaction results showed that the degradation of RhB was a pseudo-first order reaction and the photocatalytic activity of the prepared BiOC1 was much higher than those of conventional BiOC1 and P25. After the catalyst was used 4 times, the degradation rate still reached 95.0%.
出处
《石油化工》
CAS
CSCD
北大核心
2013年第10期1165-1169,共5页
Petrochemical Technology
关键词
氯氧化铋
氧化还原法
光催化降解
罗丹明B
bismuth oxychloride
redox method
photocatalytic degradation
Rhodamine B
