New method for the simultaneous determination of diffusion and adsorption of dyes in silica hydrogels

JOURNAL OF COLLOID AND INTERFACE SCIENCE

卷:425

Article

Perullini, Mercedes¹  Jobbagy, Matias¹  Japas, Maria Laura²  Bilmes, Sara A.¹ 

[1] Univ Buenos Aires, Fac Ciencias Exactas & Nat, INQUIMAE DQIAQF, Buenos Aires, DF, Argentina

[2] Ctr Atom Constituyentes CNEA, Pcia De Buenos Aires, San Martin, Argentina

关键词: Diffusion;    Adsorption;    Sol-gel;    Silica hydrogel;   

DOI  :  10.1016/j.jcis.2014.03.030

来源: Elsevier

【 摘 要 】

The fine tuning of porosity in sol gel based devices makes possible the design of novel applications in which the transport of molecules through the oxide gel plays a crucial role. In this work we develop a new method for the simultaneous analysis of diffusion and adsorption of small diffusing probes, as anionic and cationic dyes, through silica mesoporous hydrogels synthesized by sol-gel. The novelty of the work resides in the simplicity of acquisition of the experimental data (by means of a desk scanner) and further mathematical modeling, which is in line with high throughput screening procedures, enabling rapid and simultaneous determination of relevant diffusion and adsorption parameters. Net mass transport and adsorption properties of the silica based hydrogels were contrasted to dye adsorption isotherms and textural characterization of the wet gels by SAXS, as well as that of the corresponding aerogels determined by Field Emission Scanning Electron Microscopy (FESEM) and N-2 adsorption. Thus, the validation of the results with well-established characterization methods demonstrates that our approach is robust enough to give reliable physicochemical information on these systems. (C) 2014 Elsevier Inc. All rights reserved.

【 授权许可】

Free