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Preparation and characterization of tungsten trioxide-titanium dioxide composite film and its applications in heterogeneous photocatalysis

หน่วยงาน จุฬาลงกรณ์มหาวิทยาลัย

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ชื่อเรื่อง : Preparation and characterization of tungsten trioxide-titanium dioxide composite film and its applications in heterogeneous photocatalysis
นักวิจัย : Apichon Watcharenwong
คำค้น : Titanium dioxide films , Photocatalysis
หน่วยงาน : จุฬาลงกรณ์มหาวิทยาลัย
ผู้ร่วมงาน : Puangrat Kajitvichyanukul , Rajeshwar, Krishnan , Chulalongkorn University. Graduate School
ปีพิมพ์ : 2550
อ้างอิง : http://cuir.car.chula.ac.th/handle/123456789/14776
ที่มา : -
ความเชี่ยวชาญ : -
ความสัมพันธ์ : -
ขอบเขตของเนื้อหา : -
บทคัดย่อ/คำอธิบาย :

Thesis (Ph.D.)--Chulalongkorn University, 2007

This research focuses on preparation and characterization of TiO[subscript 2], WO[subscript 3] and composite films using two techniques: electrodeposition and anodization. Optimization of SS/TiO[subscript 2], SS/WO[subscript 3] and composite films prepared by electrodeposition on the stainless steel (SS) type 304 was investigated. This study also probes the relationship between the morphology of anodic TiO[subscript 2] and WO[subscript 3] layers grown on Ti or W foil substrates and their subsequent photoelectrochemical response in 0.5 M Na[subscript 2]SO[subscript 4] supporting electrolyte. The effects of anodization variables (voltage and time) and anodization medium composition [water, glycerol, poly(ethylene glycol) (PEG), ethylene glycol (EG)] along with fluoride ion concentration on the oxide layer morphology and photoresponse are described. Well define nanotube morphology of TiO[subscript 2] was observed when the fluoride ion containing electrolyte was modified by PEG400 or EG while the nanotube morphology could not be observed on W substrate. In fabrication of composite film by pulse anodization technique, two types of composite film (W/WO[subscript 3]/TiO[subscript 2] and Ti/TiO[subscript 2]/WO[subscript 3]) were conducted. These composite films exhibit better photoelectrochemical response than the pure W/WO[subscript 3] and Ti/TiO[subscript 2], respectively. In addition, the well organized composite Ti/TiO[subscript 2]/WO[subscript 3] nanotube films were fabricated and gave the excellent photoelectrochemical performance reaching 7.7 mA cm[superscript -2]. Finally, photocatalytic reduction of hexavalent chromium and photocatalytic oxidation of methylene blue were studied under ultraviolet light using anodically growth Ti/TiO[subscript 2], W/WO[subscript 3] and composite films. Furthermore, visible light ([lambda] > 400 nm) degradation of methylene blue using W/WO[subscript 3] films was studied. The photocatalytic degradation rate follow Langmuir–Hinshelwood model yields k = 0.687 [mu]M min[superscript -1] and K = 0.021 [mu]M[superscript -1].

บรรณานุกรม :
Apichon Watcharenwong . (2550). Preparation and characterization of tungsten trioxide-titanium dioxide composite film and its applications in heterogeneous photocatalysis.
    กรุงเทพมหานคร : จุฬาลงกรณ์มหาวิทยาลัย.
Apichon Watcharenwong . 2550. "Preparation and characterization of tungsten trioxide-titanium dioxide composite film and its applications in heterogeneous photocatalysis".
    กรุงเทพมหานคร : จุฬาลงกรณ์มหาวิทยาลัย.
Apichon Watcharenwong . "Preparation and characterization of tungsten trioxide-titanium dioxide composite film and its applications in heterogeneous photocatalysis."
    กรุงเทพมหานคร : จุฬาลงกรณ์มหาวิทยาลัย, 2550. Print.
Apichon Watcharenwong . Preparation and characterization of tungsten trioxide-titanium dioxide composite film and its applications in heterogeneous photocatalysis. กรุงเทพมหานคร : จุฬาลงกรณ์มหาวิทยาลัย; 2550.