Adsorption of Remazol Red 3BS from aqueous solutions using APTES- and cyclodextrin-modified HMS-type mesoporous silicas

作者：Asouhidou Despoina D; Triantafyllidis Kostas S; Lazaridis Nikolaos K^*; Matis Kostas A

来源：Colloids and Surfaces A: Physicochemical and Engineering Aspects , 2009, 346(1-3): 83-90.

DOI：10.1016/j.colsurfa.2009.05.029

• HMS mesoporous silica
• beta-Cyclodextrin (CD)
• Aminopropyl-modified silica
• APTES
• Adsorption
• Regeneration
• Azo-dye
• Remazol Red

The removal of Remazol Red 3BS (C.I. 239) dye by HMS ordered mesoporous silica, aminopropyl-modified HMS (HMS-NH(2)) and beta-cyclodextrin-modified HMS (HMS-CD) materials was studied in the present work. The modified materials were functionalized in situ by adding the organic modifiers (3-aminopropyltriethoxysilane and a silylated derivative of MCT-beta-CD) in the synthesis mixture and using dodecylamine as the mesopore structure directing agent. The successful incorporation of aminopropyl groups in HMS-NH(2) and of cyclodextrin moieties in HMS-CD was verified by means of FT-IR spectroscopy, elemental analysis and N(2) porosimetry. The HMS-CD material exhibited significantly higher adsorption capacity compared to that of the HMS-NH(2) material, while the parent HMS mesoporous silica showed negligible adsorption capability. The maximum adsorption capacities obtained (at the optimum pH 2) on the basis of the Langmuir analysis were 0.28 mmol/g for HMS-CD and 0.14 mmol/g for HMS-NH(2). It Was shown that the HMS-CD sorbent can be effectively regenerated by the surfactant-enhanced regeneration method using SDS and that can be reused without significant loss of its adsorption capabilities.

• 出版日期2009-8-20