常压下Ag-TiO_2纳米管制备及光催化反应动力学研究(英文)  

Synthesis of Ag-TiO_2 Nanotubes in Ambient Atmosphere and Kinetics of Photocatalytic Reaction

作　　者：李静玲[1,2] 陈文哲[1,2] 毕晶晶[1] 郭大敬[1] 杨炳灿[1] 周志武[1] 

机构地区：[1]福建工程学院,福州350108 [2]福州大学材料科学与工程学院,福州350108

出　　处：《传感技术学报》2010年第5期617-620,共4页Chinese Journal of Sensors and Actuators

基　　金：福建省发改委重点工程项目资助(2006-02);福建省自然科学基金资助项目(2006J0183,2006J0437);福建省教育厅科技项目资助(JA08164)

摘　　要：首次在常压下,以试剂TiO2、NaOH和AgNO3为原料,碱熔温度为700℃,水热法制备了Ag-TiO2复合纳米管光催化剂。TEM和XRD用于纳米管组织与形貌表征。研究了纳米管制备以及用于模拟污染物甲基橙(MO)光催化降解的实验条件。结果表明,原料是否碱熔,水热温度高低和时间长短,对光催化剂性能影响明显;当MO溶液初始浓度Co为4mg/L、光催化降解反应持续4h,光催化降解率达到99%。降解反应的速率常数k与Co呈0.9966级的动力学关系。Ag-TiO2 composite nanotubes were synthesized for the first time by using the hydrothermal crystallization with TiO2,NaOH and AgNO3 at 700 ℃ in ambient atmosphere.The synthesized nanotubes were then characterized using TEM and XRD techniques.The experimental conditions for the nanotube synthesis and the photocatalytic degradation mechanism of methyl orange（MO）with nanotubes as a photocatalyst were also examined.The results show that there is a distinct effect on nanotube＇s photocatalytic characteristics under different synthesizing conditions such as melting and hydrothermal crystallization temperature and time.The photocatalytic degradation rate（η）reached about 99 % when the reaction was kept for 4 h and the initial concentration of MO solution（Co）was 4 mg/L.The relationship between the rate constant（k）of the degradation and Co conformed to an order of 0.996 6 reaction.

关 键 词：Ag-TiO2纳米管 制备 光催化 降解 动力学 

分 类 号：TB383[一般工业技术—材料科学与工程] O614[理学—无机化学]