Transactions of Nonferrous Metals Society of China The Chinese Journal of Nonferrous Metals

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中国有色金属学报

ZHONGGUO YOUSEJINSHU XUEBAO

第22卷    第12期    总第165期    2012年12月

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文章编号:1004-0609(2012)12-3439-07
Br掺杂纳米多孔TiO2的制备及其吸附性能
张文莉,燕  云,吕红艳,张福梅,蒋银花

(江苏大学 化学化工学院,镇江 212013)

摘 要: 以钛酸四丁酯为钛源,NH4Br为溴源,应用水热技术制备Br掺杂纳米多孔TiO2材料(Br/TiO2)。利用X射线衍射仪和场发射扫描电镜表征材料的结构和形貌,并从热力学和动力学角度研究Br/TiO2对阳离子蓝X-GRL的吸附行为。结果表明:Br掺杂有利于形成棒状交联的多孔结构,增强TiO2对阳离子蓝X-GRL的吸附性能,吸附效率为92.2%,是空白样品的1.56倍。动力学研究表明:该吸附行为符合准二级动力学模型,测得其表观活化能为14.551 kJ/mol,说明该吸附属于物理吸附。热力学研究表明:Br/TiO2对阳离子蓝X-GRL吸附自由能变为−8.343~−5.600 kJ/mol,吸附熵变为137.10 J/(K∙mol),吸附焓变为33.773 kJ/mol,该吸附过程是一个自发的吸热过程。

 

关键字: Br掺杂;二氧化钛;纳米多孔材料;吸附动力学;吸附热力学

Preparation and adsorption property of Br-doped nano porous TiO2
ZHANG Wen-li, YAN Yun, LÜ Hong-yan, ZHANG Fu-mei, JIANG Yin-hua

School of Chemistry and Chemical Engineering, Jiangsu University, Zhenjiang 212013, China

Abstract:Br-doped TiO2 nano porous materials (Br/TiO2) were prepared using NH4Br as the bromine precursor and tetrabutylorthotitanate as Ti source by the hydrothermal method. The structure and morphology of the prepared sample were characterized by X-ray diffraction (XRD) and field-emission scanning electronmicroscopy (FE-SEM). The kinetic and thermodynamic parameters for the absorption of cationic blue X-GRL in aqueous solution by Br/TiO2 were studied.The results show that Br doping favors to form the nano porous network structure composed of TiO2 nanorods, which helps to the absorption property of cationic blue X-GRL. The adsorption efficiency of Br/TiO2 is 92.2%, which is the 1.56 times of bare TiO2. The kinetics study results show that the pseudo-second-order kinetic model is well described for the adsorption of Br/TiO2 for cationic blue X-GRL. And the apparent activation energy is determined to be 14.551 kJ/mol. The thermodynamics study results show that the values of ΔGΘ are in the range of −8.343~−5.600 kJ/mol, and the values of ΔHΘ and ΔSΘ are 33.773 kJ/mol and 137.10 J/(K∙mol), respectively. So, the adsorption process is endothermic and spontaneous.

 

Key words: Br doping; TiO2; nanoporous material; adsorption kinetics; adsorption thermodynamics

ISSN 1004-0609
CN 43-1238/TG
CODEN: ZYJXFK

ISSN 1003-6326
CN 43-1239/TG
CODEN: TNMCEW

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