【作者】 卜云洁； 王鑫； 张晶； 黄嘉瑜； 奔特万； 赵建夫； 王学江；

【Author】 Yunjie Bu;X Wang;XJ Wang;State Key Laboratory of Pollution Control and Resources Reuse,College of Environmental Science and Engineering,Tongji University;

【机构】 污染控制与资源化研究国家重点实验室,同济大学；

【摘要】 近年来,一种将具有可见光催化功能的改性TiO2负载到轻质载体上制备的漂浮型可见光催化材料,因其使用中悬浮于气液界面上,可充分发挥TiO2催化剂对太阳光的吸收和对空气中氧的利用,具有使用方便、处理成本低廉以及原位修复等特点,逐渐受到人们的重视[1-3]。本文以膨胀珍珠岩(EP)为漂浮型载体,采用溶胶-凝胶法,制备了硼、氮共掺杂B-N-TiO2/EP型光催化剂,借助SEM、XRD、UV-Vis、DRS和XPS等分析手段对进行材料表征,通过罗丹明B降解实验进行材料优化。结果表明,硼、氮元素是以间隙氮原子和间隙硼原子的形式进入TiO2晶格结构,通过在价带上方产生新的能带,减小禁带宽度,从而实现对可见光的利用。当焙烧温度为550℃,EP投加量为2.0g,B/Ti摩尔比为0.38时,所制备催化剂光催化活性最好,可见光条件下反应3h后对罗丹明B去除率为93%以上。根据L-H动力学方程,不同B/Ti摩尔比TiO2光催化剂对罗丹明B降解反应均遵循一级动力学模型。更多还原

【Abstract】 Recently,a floating visible-light photocatalyst,which was prepared by loading the modified TiO2 on light carrier,has attracted widespread interest.The material maximizes adsorption of sunlight and oxygen in the air,because which can suspended in the air/water interface.Besides,the pholocatalyst has advantage of convenience,cost-effective and fitting for in-situ remediation[1-3].B-N-codoped TiO2 visible-light photocatalysts were synthesized by so-gel method using expanded perlite(EP) as support,with characterized by SEM,XRD,UV-Vis and XPS,respectively.The best preparation conditions of photocatalysts was determined by the degradation of rhodamine B.Results showed that the B-N-TiO2/EP visible-light photocatalysts prepared at calcination temperature of 550 ℃,EP dosage of 2.0g,B/Ti mole ratio of 0.38,exhibited the best visible-light photocatalytic activity.The removal efficiency of rhodamine B was above 93% for three hours under visible light.The degradation of rhodamine B with different B/Ti molar ratio followed the first order kinetics model.更多还原