摘要
以Nb_(2)O_(5)为原料制备了纳米块状NaNbO_(3),采用沉淀法制备了不同摩尔比的BiOBr/NaNbO_(3)(BNN)复合材料,其中BNN-10(n(Bi)∶n(Nb)=10∶1)对RhB的降解率为87.8%,分别是单一BiOBr和NaNbO_(3)的2.4倍和4.1倍.BNN-10经过5个周期降解RhB,其光催化性能没有明显下降,表明BNN-10具有较高的可重复利用性和稳定性.利用X射线粉末衍射仪(XRD)和扫描电子显微镜(SEM)对BNN-10的晶体结构进行了表征,通过X射线光电子能谱(XPS)对催化剂化学态的分析,催化剂的光电特性及捕获实验验证BNN为直接Z型异质结构.该构型有效地阻止了光生电子空穴复合,并最大程度保留了各自单一半导体较高的氧化和还原能力,因此其光催化降解RhB效率得到显著提高.
Nanoblock NaNbO_(3)was prepared from Nb_(2)O_(5),and BiOBr/NaNbO_(3)(BNN)composites with different molar ratios were prepared by precipitation method,in which BNN-10(n(Bi)∶n(Nb)=10∶1)degraded RhB by 87.8%,which was 2.4 and 4.1 times higher than that of single BiOBr and NaNbO_(3),respectively.The photocatalytic performance of BNN-10 did not decrease significantly after 5 cycles of RhB degradation,indicating that BNN-10 has high reusability and stability.The crystal structure of BNN-10 was characterized by X-ray powder diffractometer(XRD)and scanning electron microscope(SEM),and the analysis of the chemical state of the catalyst by X-ray photoelectron spectroscopy(XPS),the photoelectric properties of the catalyst and the capture experiments verified that BNN is a Z-scheme heterostructure.This configuration effectively hinders the photogenerated electron-hole complex and maximizes the retention of the higher oxidation and reduction capacity of the respective single semiconductor,thus its photocatalytic degradation efficiency of RhB is significantly improved.
作者
樊国栋
李楠
潘谦宏
张晗
苏肖彦
FAN Guo-dong;LI Nan;PAN Qian-hong;ZHANG Han;SU Xiao-yan(College of Chemistry and Chemical Engineering,Key Laboratory of Auxiliary Chemistry&Technology for Chemical Industry,Ministry of Education,Shaanxi University of Science&Technology,Xi'an 710021,China;Changqing Chemical Group Co.,Ltd.,Xi'an 710018,China)
出处
《陕西科技大学学报》
北大核心
2021年第5期97-104,共8页
Journal of Shaanxi University of Science & Technology
基金
陕西省科技厅科技攻关计划项目(016GY-142)
教育部轻化工助剂化学与技术重点实验室开放基金项目(KFKT2019-11)。
