Effects of Surface Properties and Solvent PH Values on the Adsorption/Desorption Abilities of Mesoporous SBA-15 to Methylene Blue Molecules

Abstract:

Methylene blue (MB) was used as model molecule to investigate the effects of surface properties and solvent pH values on the adsorption and desorption (or release) behaviors of mesoporous SBA-15 materials. It was found that the treatment of SBA-15 with a pH 7.8 aqueous solution can enhance the adsorption rate and capacity in comparison with the pristine SBA-15. The effect of pH values on MB releasing from the weak base treated SBA-15 and the pristine one have been studied and been compared in pH values range from 0.5 to 7.0. Both of them showed a maximum releasing rate at about pH 2 and all of the treated SBA-15 samples showed a higher releasing quantity than the pristine ones. The influence mechanisms of base treatment on the adsorption ability and that of pH values on the releasing properties of SBA-15 samples have been analyzed and been discussed based on the composition, the morphology, the surface area and pore size distribution and adsorption/desorption measurements.

• Periodical: Advanced Materials Research (Volumes 518-523)
• Pages: 352-355
• DOI: https://doi.org/10.4028/www.scientific.net/AMR.518-523.352
• Online since: May 2012
• Authors: Hui Liu, Hong Liang Li, Meng Xue Wang, Jing Jing Sang, Xiu Song Zhao
• Keywords: Adsorption, Mesoporous Silica, pH Effect, Release, SBA-15, Surface Charge

References

[1] C.X. Yan, C. Q.Wang, J.F. Yao and L.X. Zhang: Colloids Surf., A Vol. 333 (2009), p.115

[2] Z.H. Pan, J.Y. Tian, G.R. Xu and J.J. Li: WR Vol. 45 (2011), p.819

[3] D.Y. Zhao, Q.S. Huo, J.L. Feng and B. F. Chmelka: J. Am. Chem. Soc. Vol. 120 (1998), p.6024

[4] H. L. Li, N. Perkas, Q. L. Li, Y. Gofer, Y. Koltypin and A. Gedanken, Langmuir, 19 (2003), p.10409.

DOI: 10.1021/la035280l

[5] S. Wall, in: Volume 2 of Handbook of Applied Surface and Colloid Chemistry, Chapter 1, Edited by Krister Holmberg, John Wiley & Sons, Ltd (2001).