物理化学学报 >> 2013, Vol. 29 >> Issue (02): 371-376.doi: 10.3866/PKU.WHXB201211146

催化和表面科学 上一篇    下一篇

连续在线原位ATR-FTIR技术测定介孔CuAl2O4对黄药的吸附

葛东来, 范迎菊, 尹龙, 孙中溪   

  1. 济南大学化学化工学院, 济南 250022
  • 收稿日期:2012-09-26 修回日期:2012-11-13 发布日期:2013-01-14
  • 通讯作者: 孙中溪 E-mail:sunzx@ujn.edu.cn
  • 基金资助:

    国家自然科学基金(51274104, 50874052)和国家重大科学研究计划(973) (2011CB933700)资助项目

Determination of the Adsorption of Xanthate on Mesoporous CuAl2O4 Using a Continuous Online In situ ATR-FTIR Technology

GE Dong-Lai, FAN Ying-Ju, YIN Long, SUN Zhong-Xi   

  1. School of Chemistry and Chemical Engineering, University of Jinan, Jinan 250022, P. R. China
  • Received:2012-09-26 Revised:2012-11-13 Published:2013-01-14
  • Supported by:

    The project was supported by the National Natural Science Foundation of China (51274104, 50874052) and National Key Basic Research Program of China (973) (2011CB933700).

摘要:

以丁胺和正十二醇为混合模板剂, 采用共沉淀法制备了介孔纳米CuAl2O4. 用X射线粉末衍射(XRD)、傅里叶变换红外(FTIR)光谱、N2吸附-脱附对产物的结构进行了表征. 采用连续在线原位衰减全反射傅里叶变换红外(ATR-FTIR)光谱技术研究了水溶液中丁基和辛基黄药在介孔CuAl2O4表面的吸附. 随着吸附时间的延长,1200 和1040 cm-1两处黄药特征峰的高度逐渐增加, 根据1200 cm-1处C-O-C伸缩振动峰的变化来评价黄药在CuAl2O4表面的吸附动力学过程. 结果表明, 介孔纳米CuAl2O4对黄药有很强的吸附能力, 在100 min 的时间内, CuAl2O4样品对丁基和辛基黄药的吸附量分别达到了236 和300 mg·g-1, 且属于化学吸附. 对实验数据进行理论模拟, 发现吸附过程更接近于拟二级吸附动力学方程.

关键词: 原位吸附, 衰减全反射傅里叶变换红外光谱, 在线, 介孔, CuAl2O4, 黄药

Abstract:

In this study, mesoporous nano CuAl2O4 was synthesized through a coprecipitation method using simple mixed templates consisting of butylamine and dodecanol. The sample was characterized by X-ray diffraction (XRD), Fourier transform infrared spectroscopy (FTIR), and nitrogen adsorptiondesorption techniques. The absorption of butyl and octyl xanthate from aqueous solution onto the synthesized mesoporous CuAl2O4 solid surfaces was studied by a continuous, online, in situ attenuated total reflection Fourier transform infrared spectroscopy (ATR-FTIR) technique. The CuAl2O4 membrane used in the adsorption experiments was prepared on a germanium internal reflection element using the chemical bath deposition method. During the adsorption process, the characteristic peak height of xanthate at 1200 and 1040 cm-1 emerged and gradually increased. By monitoring changes in the peak height at 1200 cm-1, which was assigned to the stretching vibration caused by C-O-C of the adsorbed xanthate molecules, the adsorption kinetics were studied. The adsorption results show that mesoporous CuAl2O4 has a high chemisorption capacity for xanthate, which reaches 236 and 300 mg·g-1 for butyl and octyl xanthate, respectively, within 100 min. The adsorption kinetics can be described by a pseudo-second-order reaction model.

Key words: In situ adsorption, Attenuated total reflection Fourier transform infrared spectroscopy, Online, Mesopore, CuAl2O4, Xanthate

MSC2000: 

  • O647