A practical organometallic decorated nano-size SiO2-Al2O3 mixed-oxides for methyl orange removal from aqueous solution

作者：Arshadi M^*; Vahid F Salimi; Salvacion J W L; Soleymanzadeh M

来源：Applied Surface Science, 2013, 280: 726-736.

DOI：10.1016/j.apsusc.2013.05.052

• Nano-sized SiO2-Al2O3
• Methyl orange
• Dye adsorption
• Immobilized ferrocene

In this study, the application of a functional ferrocene (ferrocenecarboxaldehyde) firmly heterogenized over a modified nano-size SiO2-Al2O3 mixed-oxides was reported as a novel adsorbent for the removal of methyl orange from aqueous solution. SiO2-Al2O3 mixed-oxides was functionalized with 3-aminopropyl-triethoxysilane (3-APTES) group and ferrocenecarboxaldehyde covalently linked on this organo-functionalized SiO2-Al2O3 mixed-oxides support. The synthesized materials were characterized by FT-IR spectroscopy, UV-vis, CHN elemental analysis, BET, TGA, ICP-MS, TEM, and XPS. The contact time to obtain equilibrium for maximum adsorption was 50 min. XPS of Fe ions evidenced that most of the active sites of the nano-adsorbent is in the form of Fe3+ ions at the surface. The heterogeneous Fe3+ ions were found to be effective adsorbent for the removal of dyes from solution. The adsorption of methyl orange ions has been studied in terms of pseudo-first-order and pseudo-second-order kinetics, and the Freundlich, Langmuir, and Langmuir-Freundlich isotherm models have also been applied to the equilibrium adsorption data. The adsorption process was spontaneous and endothermic in nature and followed pseudo-second-order kinetic model.

• 出版日期2013-9-1