สืบค้นงานวิจัย
Development of TiO2-MCM-4l Thin Film from Rice Husk Silica as Photocatalyst for Treatment of BTEX from Gasohol Combustion
Pummarin Klankaw - ไม่ระบุหน่วยงาน
ชื่อเรื่อง (EN): Development of TiO2-MCM-4l Thin Film from Rice Husk Silica as Photocatalyst for Treatment of BTEX from Gasohol Combustion
ผู้แต่ง / หัวหน้าโครงการ (EN): Pummarin Klankaw
บทคัดย่อ (EN): ex-situ and in-situ method. The different preparation method was supposed to provide a different characteristic of the thin film for photocatalytic reaction. Additionally, incorporating of MCM-4l, a mesoporous silicate material obtained from rice husk silica, into TiO2 thin film could enhance the photocatalytic reactivity of the film. The ex-situ TiO2-MCM-4l sol-gel was prepared by adding the as-synthesized MCM-41 into titanium (IV) butoxide precursor. While the in-situ TiO2-MCM-4l sol-gel was produced by mixing the MCM-4l and titanium (IV) butoxide precursors to achieve co-precipitation of both silica and titanium. The formation of the thin films was conducted by automatic dip coating machine. The results from X-ray diffraction indicated the difference of the crystal structure between ex-situ and in-situ thin films. The ex-situ thin film was a composite of anatase Ti02 and hexagonal MCM-4l. Whereas the in-situ thin film had new diffraction peaks of which the results from Fourier Transform Infrared Spectrophotometry indicated the presence of a hybridized Ti-O-Si bond. This was in accordance with the photographs from Transmission Electron Microscope. The porosity of the ex-situ and in-situ tin film analyzed by Bruaner-Emette-Tailor (BET) method confirmed increase of surface area and pore volume as increase of MCM-4l content. The pore size diameter and the thickness of those films were determined in mesoporous range and nanoscale, respectively. The photocatalytic treatment of gaseous benzene and BTEX was carried out in a batch reactor equipped with UV mercury lamp (lambda max at 330 nm). The initial concentration of gaseous benzene and BTEX was 10 and 5 ppm. The role of MCM-4l to improve the adsorbability of the film was observed from higher adsorption of the gaseous pollutants during the dark phase. Moreover, the hydrophilicity of MCM-4l can enhance the photocatalytic reactivity by producing hydroxyl radicals which is a significant factor facilitating the photocatalytic reaction during UV irradiation. The overall efficiencies of benzene photocatalytic treatment using ex-situ and in-situ thin film as MCM-4l: TiO2 molar ratios (50:50) were 92 and 94% better than that of pure TiO2. The highest first-order rate of photocatalytic reaction (k) was 0.0214 min-1 belongs to in-situ thin film. The overall efficiency of the insitu thin film for photocatalytic degradation of mixed BTEX gas was about 65, 71, 76 and 82%, respectively. Thus, the in-situ method is more preferable than the ex-situ method for the preparation of high performance thin film for treatment of gaseous BTEX. Incorporating MCM-4l into TiO2 thin film can enhance the film adsorbability and facilitate the photocatalytic reaction.
บทคัดย่อ: ไม่พบข้อมูลจากหน่วยงานต้นทาง
ภาษา (EN): en
เอกสารแนบ (EN): http://dcms.thailis.or.th/dcms/dccheck.php?Int_code=54&RecId=13410&obj_id=37890
เผยแพร่โดย (EN): มหาวิทยาลัยเทคโนโลยีพระจอมเกล้าธนบุรี
คำสำคัญ (EN): photocatalytic reaction
เจ้าของลิขสิทธิ์ (EN): มหาวิทยาลัยเทคโนโลยีพระจอมเกล้าธนบุรี
หากไม่พบเอกสารฉบับเต็ม (Full Text) โปรดติดต่อหน่วยงานเจ้าของข้อมูล

การอ้างอิง

Pummarin Klankaw. "Development of TiO2-MCM-4l Thin Film from Rice Husk Silica as Photocatalyst for Treatment of BTEX from Gasohol Combustion". ไม่ระบุหน่วยงาน. ม.ป.ป.

Pummarin Klankaw. "Development of TiO2-MCM-4l Thin Film from Rice Husk Silica as Photocatalyst for Treatment of BTEX from Gasohol Combustion". ไม่ระบุหน่วยงาน. ม.ป.ป.. Print.



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Development of TiO2-MCM-4l Thin Film from Rice Husk Silica as Photocatalyst for Treatment of BTEX from Gasohol Combustion
Pummarin Klankaw
มหาวิทยาลัยเทคโนโลยีพระจอมเกล้าธนบุรี
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