Pd/N共掺杂TiO_2的制备及其光催化降解苯酚的研究  

Preparation of Pd/N co-doped TiO_2 and its performance for photocatalytic degradation of phenol

作　　者：王岩[1] 陈永[1] 孙瑞敏[1] 刘洋[1] 赵辉[1] 

机构地区：[1]开封大学功能材料研究中心,河南开封475004

出　　处：《环境污染与防治》2010年第9期32-36,共5页Environmental Pollution & Control

基　　金：河南省基础与前沿技术研究计划资助项目(No.082300420080)

摘　　要：将纳米管钛酸浸入含尿素和金属(Pd)硝酸盐的乙醇溶液中,乙醇超声挥发后所得样品先在空气气氛、600℃下煅烧,再在H2气氛、400℃下热还原制备得到Pd/N共掺杂TiO2光催化剂(Pd/N-TiO2)。利用光电子能谱(XPS)仪研究了催化剂表面N、Pd元素的化学态。结果表明,N元素以Ti—O—N形式存在,Pd元素以单质金属状态存在。考察了Pd/N-TiO2的紫外光光催化降解苯酚的活性,与单纯TiO2光催化剂和N掺杂TiO2光催化剂相比,Pd/N-TiO2活性明显提高。研究了催化剂用量、苯酚初始浓度和pH、O2流量以及外加双氧水等条件对紫外光光催化降解苯酚的活性的影响,得到光催化降解苯酚的最佳工艺条件:苯酚初始质量浓度为120mg/L,催化剂用量为0.10g/L,苯酚溶液初始pH为8,O2流量为80mL/min,加入适量双氧水。Pd/N co-doped TiO2 photocatalyst was prepared with titanic acid nanotube as precursor.Urea and metallic （Pd） nitrate were first dispersed on the surface of titanic acid nanotube by supersonic technique.Sintering the pretreated precursor at 600 ℃ for 2 h in air and reducing at 400 ℃ for 2 h in H2,we can finally get the Pd/N co-doped TiO2 photocatalyst.The photocatalytic activity was evaluated by photocatalytic degradation of phenol under UV light,and the effect of catalyst dosage,initial concentrations of phenol,pH,oxygen and hydrogen peroxide on the photodegradation rate was investigated.The results displayed that the photocatalytic activity of Pd/N co-doped TiO2 was superior to undoped TiO2 and N-doped TiO2.The surface of catalyst was characterized by XPS and the spectra showed that N element existed in the form of Ti-O-N,while Pd existed as elemental palladium.The optimum process conditions were obtained as follow：initial concentration of phenol was 120 mg/L,catalyst dosage was 0.10 g/L,pH was 8,and oxygen-speed was 80 mL/min,under these conditions,the catalyst presented the best photocatalytic activity.

关 键 词：纳米管钛酸 TiO_2 Pd/N共掺杂 苯酚 光催化 最佳工艺条件 

分 类 号：X703[环境科学与工程—环境工程]