摘要
以天然鳞片石墨为载体,采用溶胶凝胶法制备了Pr-Co/TiO_2/鳞片石墨粒子电极。用电子扫描显微镜(SEM)和X射线光电子能谱仪(XPS)对其形貌和元素组成进行表征。将制备的粒子电极应用于罗丹明B(RhB)的光电催化降解试验,结果表明,当电解质浓度为0.03 mol/L,外加偏压为10 V,粒子电极投加量为6.67 g/L,曝气量为30 m L/min,pH值为3,RhB初始质量浓度为25 mg/L时,反应45 min后RhB的去除率达98.57%。最后对RhB的光电催化降解动力学进行了初步探讨。
This article is dedicated to the improvement of the photocatalytic activity of TiO2 by modifying its working features by way of co-doping of Pr and Co, for the photocatalytic activity of Ti02 under the visible light irradiation is quite low for its high band gap value （3.2 eV）. Therefore, we have chosen natural flake graphite as a kind of carrier for its large surface area and great resistance at high temperatures to synthesize Pr - Co/TiO2/ flake graphite particle electrode with the sol-gel method. What is more, since the surface characteristics and the elements of the particle electrodes can be determined and identified through scanning the electron microscope （SEM） and X-ray photoelectron spectroscopy （XPS）, it is possible for them to be applied to the photoelectrocatalytic degradation of rhodamine B by using a 500 W Xenon lamp as a light soufce and bias voltage provided by DC power supply. The experiments we have done indicate that the photoeletrocatlysis has a synergistic effect and the particle electrodes are of nice stability. And, then, we have also made an investigation of the effects of the four operating parameters, that is, the electrolyte concentration, the applied bias voltage, pH value and the initial concentration of RhB on the degradation efficiency of RhB in the paper, with Na2SO4 used as the supporting electrolytes and the concentration of electrolyte functioning for the photoelectrocatalytic degradation of RhB. As a result, we have found that, when the electrolyte concentration has increased from 0. 005 mol/L to 0. 03 mol/L, the removal ratios of RhB should rise from 61.99% to 94. 68% after 60 min. At the same time, SO2- ions tend to be able to enhance the charge-transfer in the photoelectrocatalytic＇ reactor, thus, resulting in an increase of the capture effects for photogenerated electrons under the external electric field. Furthermore, the increase of the electrolyte concentration tends to lead to a great increase in the efficiency of RhB degradation through direct and/or indi
作者
邹婕
余健
唐浩
李伟
ZOU Jie YU Jian TANG Hao LI Wei(College of Civil Engineering, Hunan University, Changsha 410082, China)
出处
《安全与环境学报》
CAS
CSCD
北大核心
2016年第6期229-234,共6页
Journal of Safety and Environment
基金
国家"十一五"水体污染与治理重大专项(2009ZX07423-004)
