Methyl orange adsorption by microporous and mesoporous TiO2-SiO2 and TiO2-Si O2-Al2O3 composite xerogels

Zhijian Wu; Ik Sung Ahn; Yanxin Lin; Liyao Huang; Xinren Lan; Kangtaek Lee

doi:10.1163/156855404322971459

Methyl orange adsorption by microporous and mesoporous TiO₂-SiO₂ and TiO₂-Si O₂-Al₂O₃ composite xerogels

Zhijian Wu, Ik Sung Ahn, Yanxin Lin, Liyao Huang, Xinren Lan, Kangtaek Lee

Department of Chemical and Biomolecular Engineering

Research output: Contribution to journal › Article › peer-review

13 Citations (Scopus)

Abstract

We investigate the adsorption behavior of methyl orange (MO) on composite xerogels. Mesoporous TiO₂-SiO₂ and TiO₂-Si O₂-Al₂O₃ xerogels are prepared by hydrolysis of tetraethyl orthosilicate (TEOS), tetrabutyl orthotitanate (TBOT), and AlCl₃ · 6H₂O using HCl as a catalyst and cetyltrimethylammonium bromide (CTAB) as a templating agent. The corresponding microporous xerogels are also prepared without addition of CTAB. These xerogels are then characterized by XRD, FTIR, and BET. We find that MO is adsorbed by the mesoporous xerogels in acidic solutions, showing Langmuir type adsorption isotherms. We also find that the adsorption decreases with increasing temperature. It is suggested that adsorption exhibits a sieve effect and that MO is adsorbed through electrostatic attraction and hydrogen bonding between MO and the xerogels.

Original language	English
Pages (from-to)	205-212
Number of pages	8
Journal	Composite Interfaces
Volume	11
Issue number	2
DOIs	https://doi.org/10.1163/156855404322971459
Publication status	Published - 2004

All Science Journal Classification (ASJC) codes

Ceramics and Composites
Physics and Astronomy(all)
Surfaces, Coatings and Films

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title = "Methyl orange adsorption by microporous and mesoporous TiO2-SiO2 and TiO2-Si O2-Al2O3 composite xerogels",

abstract = "We investigate the adsorption behavior of methyl orange (MO) on composite xerogels. Mesoporous TiO2-SiO2 and TiO2-Si O2-Al2O3 xerogels are prepared by hydrolysis of tetraethyl orthosilicate (TEOS), tetrabutyl orthotitanate (TBOT), and AlCl3 · 6H2O using HCl as a catalyst and cetyltrimethylammonium bromide (CTAB) as a templating agent. The corresponding microporous xerogels are also prepared without addition of CTAB. These xerogels are then characterized by XRD, FTIR, and BET. We find that MO is adsorbed by the mesoporous xerogels in acidic solutions, showing Langmuir type adsorption isotherms. We also find that the adsorption decreases with increasing temperature. It is suggested that adsorption exhibits a sieve effect and that MO is adsorbed through electrostatic attraction and hydrogen bonding between MO and the xerogels.",

author = "Zhijian Wu and Ahn, {Ik Sung} and Yanxin Lin and Liyao Huang and Xinren Lan and Kangtaek Lee",

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T1 - Methyl orange adsorption by microporous and mesoporous TiO2-SiO2 and TiO2-Si O2-Al2O3 composite xerogels

AU - Wu, Zhijian

AU - Ahn, Ik Sung

AU - Lin, Yanxin

AU - Huang, Liyao

AU - Lan, Xinren

AU - Lee, Kangtaek

PY - 2004

Y1 - 2004

N2 - We investigate the adsorption behavior of methyl orange (MO) on composite xerogels. Mesoporous TiO2-SiO2 and TiO2-Si O2-Al2O3 xerogels are prepared by hydrolysis of tetraethyl orthosilicate (TEOS), tetrabutyl orthotitanate (TBOT), and AlCl3 · 6H2O using HCl as a catalyst and cetyltrimethylammonium bromide (CTAB) as a templating agent. The corresponding microporous xerogels are also prepared without addition of CTAB. These xerogels are then characterized by XRD, FTIR, and BET. We find that MO is adsorbed by the mesoporous xerogels in acidic solutions, showing Langmuir type adsorption isotherms. We also find that the adsorption decreases with increasing temperature. It is suggested that adsorption exhibits a sieve effect and that MO is adsorbed through electrostatic attraction and hydrogen bonding between MO and the xerogels.

AB - We investigate the adsorption behavior of methyl orange (MO) on composite xerogels. Mesoporous TiO2-SiO2 and TiO2-Si O2-Al2O3 xerogels are prepared by hydrolysis of tetraethyl orthosilicate (TEOS), tetrabutyl orthotitanate (TBOT), and AlCl3 · 6H2O using HCl as a catalyst and cetyltrimethylammonium bromide (CTAB) as a templating agent. The corresponding microporous xerogels are also prepared without addition of CTAB. These xerogels are then characterized by XRD, FTIR, and BET. We find that MO is adsorbed by the mesoporous xerogels in acidic solutions, showing Langmuir type adsorption isotherms. We also find that the adsorption decreases with increasing temperature. It is suggested that adsorption exhibits a sieve effect and that MO is adsorbed through electrostatic attraction and hydrogen bonding between MO and the xerogels.

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Methyl orange adsorption by microporous and mesoporous TiO₂-SiO₂ and TiO₂-Si O₂-Al₂O₃ composite xerogels

Abstract

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