|
Functionalized mesoporous silica from rice husk for BTEX adsorption in gas phase |
|---|---|
| รหัสดีโอไอ | |
| Title | Functionalized mesoporous silica from rice husk for BTEX adsorption in gas phase |
| Creator | 1. Thanita Areerob 2. Siriluk chiarakorn 3. Nurak Grisdanurak |
| Publisher | Joint Graduate School of Energy and Environment |
| Publication Year | 2557 |
| Keyword | mesoporous silica, silylation, rice husk, BTEX, adsorption |
| Abstract | The BTEX, consisting of benzene, toluene, ethylbenzene, and three isomers of xylene, are volatile organic compounds (VOCs) causing the harmful effect to human health. Thus, the development of BTEX adsorbent for treatment and measurement is necessary. Two silane reagents, trimethylchlorosilane (TMCS) and n-propyltriethoxysilane (n-PTES) were used to improve the BTEX adsorption performance of RH-MCM-41. The silylated RH-MCM-41 with n-PTES had slightly smaller pore size and pore volume than that silylated with TMCS due to its larger molecular size and complicated structure. Additionally, it was obviously seen that small trimethylsilyl groups can easily penetrate into hexagonal pores resulting in better surface coverage. The adsorption efficiencies of BTEX on unsilylated and silylated RH-MCM-41 at various relative humidity conditions from 25 to 99% RH were measured. The BTEX adsorption efficiency increased after RH-MCM-41 was silylated with both silane reagents due to the alkylsilyl group loading. Hence, the BTEX adsorption efficiency of RH-MCM-41 could be improved by silylation. Moreover, The BTEX adsorption efficiency of RH-MCM-41 silylated by n-PTES was less than that silylated by TMCS. This can be explained that the complicated structure with branch and large molecular size of n-PTES causes less degree of silylation. |
| ISBN | 978-616-92228-1-1 |
