The Application of NIR Process Analytical Chemistry in Studying Competitive Adsorption Process
American Journal of Applied Chemistry
Volume 7, Issue 3, June 2019, Pages: 80-86
Received: Apr. 8, 2019;
Accepted: May 21, 2019;
Published: Jun. 12, 2019
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Hong-Wei Yang, College of Chemistry and Life Science, Chuxiong Normal University, Chuxiong, PR China
Chen-Bo Cai, College of Chemistry and Life Science, Chuxiong Normal University, Chuxiong, PR China
Lu Xu, College of Material and Chemical Engineering, Tongren University, Tongren, PR China
Lun Li, Department of Science and Technology, Chuxiong Normal University, Chuxiong, PR China
Yan-Li Zou, College of Chemistry and Life Science, Chuxiong Normal University, Chuxiong, PR China
Yong-Yuan Tao, College of Chemistry and Life Science, Chuxiong Normal University, Chuxiong, PR China
Mei-Qiong Wen, College of Chemistry and Life Science, Chuxiong Normal University, Chuxiong, PR China
With an experimental setup of near-infrared process analytical chemistry, a competitive adsorption process of orthoxylene and aniline vapor onto silica gel has been revealed in the paper. The mixture vapor of orthoxylene and aniline has been introduced into a quartz adsorption bed, which was filled with adsorbent of silica gel and monitored continuously by a near-infrared spectrometer. Based on near-infrared spectra recorded during the adsorption process and chemometrics methodologies, the competitive adsorption process has been studied completely as well as clearly: 1) at about 62 minutes the adsorption achieved its equilibrium or stable state with aniline concentration of 0.22 g/g, and without any orthoxylene; 2) othoxylene was adsorbed first, but then rapidly replaced by aniline; 3) the adsorption of aniline resulted from the hydrogen bonds between aniline’s amino groups and silica gel’s silanol groups while that of orthoxylene was due to physical adsorption; 4) aniline was adsorbed vertically on the silica gel but orthoxylene laid evenly; 5) some surface of silica gel was more active for adsorption than others.
The Application of NIR Process Analytical Chemistry in Studying Competitive Adsorption Process, American Journal of Applied Chemistry.
Vol. 7, No. 3,
2019, pp. 80-86.
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