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Citation: WU Zhi-Jian, LAN Xin-Ren, LIN Yan-Xin, HUANG Li-Yao. Effects of Surface-Active Substances on Methyl Orange Reactivity in SiO₂ Xerogels[J]. Chinese Journal of Applied Chemistry, ;2003, 20(3): 228-232. shu

Effects of Surface-Active Substances on Methyl Orange Reactivity in SiO₂ Xerogels

1.
College of Materials Science and Engineering, Huaqiao University, Quanzhou 362011

Corresponding author: WU Zhi-Jian,
Received Date: 1 June 2002
Available Online: 17 December 2002
Fund Project: 福建省青年科技人才创新基金(2001J023)资助项目 (2001J023)

Methyl orange (MO) doped SiO₂ xerogels derived from tetraethyl orthosilicate (TEOS) and modified with cetyltrimethylammonium bromide (CTAB), sodium dodecyl sulfate (SDS) and stearic acid (SA) respectively, were prepared. FTIR and TG analyses were used to characterize the xerogels. The color change and leaching behavior of MO in the xerogels were investigated. The experimental results show that MO in the xerogels has no definite pH value color change. The color change pH values of MO in the xerogel doped with CTAB shift to low pH values, and are lower than those of MO in the other surfactant doped xerogels. The xerogel doped with SDS shows the highest leaching rate of MO. The leaching rates in solutions of different pH values after 7 days are all higher than 30%. The leaching rate of MO in the xerogel doped with CTAB is the lowest, and the leaching rate in acidic and neutral solutions after 7 days is lower than 0.05%. The results have been discussed.
- surface-active substance,
- silica xerogel,
- methyl orange,
- doping
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Effects of Surface-Active Substances on Methyl Orange Reactivity in SiO₂ Xerogels