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首页> 外文会议>Advanced materials and nanotechnology >Improvement of BTEX Adsorption Using Silylated RH-MCM-41 Synthesized from Rice Husk Silica
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Improvement of BTEX Adsorption Using Silylated RH-MCM-41 Synthesized from Rice Husk Silica

机译：稻壳二氧化硅合成的硅烷化RH-MCM-41提高BTEX吸附

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摘要

RH-MCM-41, a mesoporous molecular sieve, was successfully synthesized from silica extracted from rice husk. The presence of silanol functional group (Si-OH) on its surface causes adverse effects on the adsorption of some non-polar compounds, especially benzene, toluene, ethylbenzene and xylene (BTEX). Thus, this work aims to enhance the adsorbability of RH-MCM-41 on BTEX adsorption by in-situ and ex-situ silylation. Trimethylchlorosilane (TMCS) was used as a silylating reagent to reduce silanol groups. The ex-situ silylation was carried out by adding as-synthesized RH-MCM-41 into 5% v/v of TMCS solution at 30℃ and stirring for 24 h. While the in-situ silylated sample was prepared by mixing 5% v/v of TMCS solution and RH-MCM-41 precursor solution at 80℃ and stirring for 120 h. The adsorption capacity of gaseous BTEX using the silylated RH-MCM-41 was determined by gas chromatography equipped with a flame ionization detector (GC-FID) with a thermal desorption unit (TDU). The adsorption capacities of the ex-situ samples were 0.617 mg g~(-1) for benzene, 1.271 mg g~(-1) for toluene, 1.902 mg g~(-1) for ethylbenzene and 0.036 mg g~(-1) of xylene, higher than that of the in-situ and the unsilylated samples. Thus, the ex-situ silylation is suitable for enhancement of hydrophobicity of RH-MCM-41. The ex-situ silylated RH-MCM-41 has the potential to be applied in gaseous BTEX treatment.
机译：从稻壳中提取的二氧化硅成功合成了介孔分子筛RH-MCM-41。硅烷醇官能团（Si-OH）在表面上的存在会对某些非极性化合物的吸附产生不利影响，尤其是苯，甲苯，乙苯和二甲苯（BTEX）。因此，这项工作旨在通过原位和异位甲硅烷基化提高RH-MCM-41对BTEX的吸附能力。三甲基氯硅烷（TMCS）用作甲硅烷基化试剂以还原硅烷醇基团。通过将合成后的RH-MCM-41添加到5％v / v的TMCS溶液中，在30℃下进行异位甲硅烷基化，并搅拌24小时。原位甲硅烷基化样品是通过在80℃下将5％v / v的TMCS溶液和RH-MCM-41前体溶液混合并搅拌120小时来制备的。使用配备了火焰离子化检测器（GC-FID）和热解吸单元（TDU）的气相色谱法测定使用甲硅烷基化RH-MCM-41的气态BTEX的吸附能力。异位样品对苯的吸附容量为0.617 mg g〜（-1），对甲苯为1.271 mg g〜（-1），对乙苯为1.902 mg g〜（-1），0.036 mg g〜（-1） ）的二甲苯，高于原位和未甲硅烷基化的样品。因此，异位甲硅烷基化适合于增强RH-MCM-41的疏水性。异位甲硅烷基化的RH-MCM-41具有在气态BTEX处理中应用的潜力。

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  • 来源
  • 会议地点 Wellington(NZ);Wellington(NZ)
  • 作者

    T. Areerob; N. Grisdanurak; S. Chiarakorn;

  • 作者单位

    Division of Environmental Technology, Joint Graduate School of Energy and Environment, King Mongkut's University of Technology Thonburi, Bangkok, THAILAND 10140;

    Department of Chemical Engineering, Thammasat University, Pathumthani, THAILAND 12120;

    Division of Environmental Technology, School of Energy, Environment and Materials, King Mongkut's University of Technology Thonburi, Bangkok, THAILAND 10140;

  • 会议组织
  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类 工程材料一般性问题;
  • 关键词

    RH-MCM-41; silylation; BTEX adsorption;

    机译：RH-MCM-41；甲硅烷基化; BTEX吸附;

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