摘要
以水热法原位制备了BiOCl_(1-x)I_x(x=0、0. 2、0. 4、0. 6、0. 8、1)材料,采用XRD、SEM、BET、SPS和UV-Vis DRS等手段对BiOCl_(1-x)I_x进行了表征。结果表明,所制备BiOCl_(1-x)I_x(x=0. 2、0. 4、0. 6、0. 8)不是Bi OCl与Bi OI的简单物理混合,而是形成了一种固溶体材料,有效促进了光生电子和空穴的分离效率。在模拟太阳光下(500 W氙灯),Bi OCl0. 8I0. 2显示了优异的光催化降解苯酚活性,其对苯酚的降解速率常数为0. 128 h-1,分别是Bi OCl、Bi OI及商用P25的7倍、18倍和2倍。循环稳定性试验表明,Bi OCl0. 8I0. 2在循环使用5次后,光催化降解苯酚活性只下降5. 5%,且反应前后的XRD图谱基本不变,表明Bi OCl0. 8I0. 2具有良好的稳定性能。
The authors intend their focus of research on the in-situ construction of BiOCl1-x Ix(x=0,0.2,0.4,0.6,0.8,1),a solid solution possessing technology that can help to enhance the simulated solar photocatalytic activity so as to display the effective degradation of phenol as well as to explore the mechanism of the improved photocatalytic properties.For this purpose,we have prepared BiOCl1-x Ix solid solutions in-situ to trace the hydrothermal changing approach by using Bi(NO3)3,KCl and KI as the raw material.At the same time,we have also adopted the technical processes like X-ray diffraction(XRD),the scanning electronic microscope(SEM)and the ultraviolet-visible diffuse reflectance spectrum(UV-Vis DRS)to analyze and characterize the crystal structures,the microstructures and the optical properties of the BiOCl1-x Ix solid solutions,respectively.The results of our investigative experiments and tests indicate that the product BiOCl1-x Ix does not resemble a simplistic mixture of BiOCl and BiOI,rather it exists as a kind of solid solution.The SEM analysis also suggests that the introduction of iodine atom may lead to apparent change of the morphology of BiOCl,when the molar ratio x=0.8,with the size of BiOCl0.8 I0.2 nanosheets being smaller than BiOCl,and the particles tending to get to a 3-D structure.What is more,we have also noticed that under the simulated sunlight illumination,BiOCl0.8 I0.2 can display its best photocatalytic performance.After all,the first-order kinetics with a rate constant of 0.128 h-1 for the degradation of phenol over BiOCl0.8 I0.2 as the photocatalyst can turn to be as much as 7 times,18 times and 2 times more as compared with that over the references of BiOCl,BiOI and P25,respectively.Recycling experiments demonstrate that the photocatalytic activity decreases by 5.5%only,even after the 5-th cycle,though no substantial change can be found or observed in the XRD patterns of BiOCl0.8 I0.2 solid solution,implying that the BiOCl1-x Ix should be a robust photocatalyst of excellent activity.Moreo
作者
马冬梅
李建章
钟俊波
彭汝芳
楚士晋
MA Dong-mei;LI Jian-zhang;ZHONG Jun-bo;PENG Ru-fang;CHU Shi-jin(Research Center of Laser Fusion,China Academy of Engineering Physics,Mianyang 621010,Sichuan,China;Key Laboratory of Green Catalysis of Higher Education Institutes of Sichuan,College of Chemistry and Environmental Engineering,Sichuan University of Science and Engineering,Zigong 643000,Sichuan,China;The State Key Laboratory for EnvironmentFriendly Energy Materials,Southwest University of Science and Technology,Mianyang 621010,Sichuan,China)
出处
《安全与环境学报》
CAS
CSCD
北大核心
2019年第1期239-246,共8页
Journal of Safety and Environment
基金
四川省绿色催化高校重点实验室开放项目(LYJ14205)
环境友好能源材料国家重点实验室开放项目(14zxfk07)
