Efficient TiO2 Powder and Film Photocatalysts with Rutile Crystal Structure

Sopyan, Iis; Watanabe, M.; Murasawa, Sadao; Hashimoto, Kazuhito; Fujishima, Akira

doi:10.1246/cl.1996.69

Cited by 91 publications

(78 citation statements)

References 6 publications

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“…The present study considers acetaldehyde, which is a well-known potential human carcinogen [4] for which maximum occupational exposure levels are set in Europe and the USA [5,6]. Several methods have been suggested to improve the indoor air climate, and among them TiO 2 -based photocatalysis has been recognized as a sustainable and environmentally friendly alternative for indoor VOC abatement, yielding only CO 2 , H 2 O, and trace mineral acids as reaction products with only low-power UV light as external energy source [7,8]. Photo-oxidation of acetaldehyde on TiO 2 has been the subject of several studies [9][10][11], and has also been proposed as a model compound for estimating the activity of photocatalytic materials for air purification [16].…”

Section: Introductionmentioning

confidence: 99%

Acetaldehyde adsorption and condensation on anatase TiO2: Influence of acetaldehyde dimerization

Stefanov

Topalian

Granqvist

et al. 2014

Journal of Molecular Catalysis A: Chemical

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Conversion of acetaldehyde to crotonaldehyde on anatase TiO 2 films was studied by in situ Fourier transform infrared spectroscopy (FTIR) and by density functional theory (DFT) calculations. In situ FTIR showed that acetaldehyde adsorption is accompanied by the appearance of a hitherto nonassigned absorption band at 1643 cm -1 , which is shown to be due to acetaldehyde dimers. The results were supported by DFT calculations. Vibrational frequencies calculated within a partially relaxed cluster model for molecular acetaldehyde and its dimer, and for the corresponding adsorbed species on the anatase (101) surface, were in good agreement with experimental results. A kinetic model was constructed based on the combined FTIR and DFT results, and was shown to explain the essential features of the acetaldehyde condensation reaction.

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Section: Introductionmentioning

confidence: 99%

Acetaldehyde adsorption and condensation on anatase TiO2: Influence of acetaldehyde dimerization

Stefanov

Topalian

Granqvist

et al. 2014

Journal of Molecular Catalysis A: Chemical

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“…8) Photon energy absorption induces holeelec tron pair generation on the surface of intrinsic semiconduc tors. Anatase absorbs the ultraviolet ray having a photon energy 3.2 eV.…”

Section: Introductionmentioning

confidence: 99%

Photo-Induced Surface Reaction of Highly Oriented Anatase Polycrystalline Films Synthesized Using a CVD Apparatus Operated in Atmospheric Regime

Tokita¹,

Tanaka²,

Ohshio³

et al. 2003

J. Ceram. Soc. Japan

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åCJú^»wCÍoujì»T^züAE»ô¸½»mõUN\Ê½ cCñÞ Þ Ec³YÞ EåÎvÞ Þ EÖ¡GrÞ ÞHighrate growth of polycrystalline anatase lms was achieved on nonepitaxial substrates using a chemical vapordeposition technique operated under air atmosphere. As the growth rate of each crystalline face was strongly dependent on the deposition conditions, four types of anatase polycrystalline lms were fabricated with several oriented directions such asq112r , q110r , q100randq001r . The photoinduced surface reaction of the anatase lms was evaluated by the reduction ability of methylene blue under ultraviolet irradiation by an ultraviolet uorescent lamp. The reduction rate of methylene blue was found to be aected by the preferen tial growth direction of crystallites.

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“…Titanium dioksida (TiO 2 ) merupakan semikonduktor yang dapat berfungsi sebagai fotokatalis yang memiliki fotoaktivitas tinggi dan stabilitas kimia meski dalam kondisi keras sekalipun (Sopyan et al,1996;Xu et al,1999). Selain itu, TiO 2 bersifat non toksik, murah dan memiliki sifat redoks yakni mampu mengoksidasi polutan organik dan mereduksi sejumlah ion logam dalam larutan (Rajh et al,1996) serta tersedia secara komersial dan preparasinya yang mudah dilakukan di laboratorium.…”

Section: Pendahuluanunclassified

PHOTOCATALYTIC ACTIVITY OF TiO2 NANO SUPPORTED ON MEMBRANE CELLULOSE ACETATE/NATA DE COCO (CA/NDC) IN PHOTODEGRADATION OF METHYLENE BLUE

et al. 2016

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ABSTRAKPenelitian tentang pembuatan dan uji efektifitas katalis membran selulosa asetat/nata de coco-TiO 2 nano (CA/NDC-TiO 2 nano) pada fotodegradasi zat warna metilen biru dengan sistem batch telah dilakukan. TiO 2 nano disintesis menggunakan metode hidrotermal dengan kalsinasi pada suhu 450 o C. Analisis Scanning Electron Microscopy (SEM) menunjukkan bahwa TiO 2 nano telah berhasil disintesis dengan rata-rata ukuran diameter partikelnya adalah 88,63  4,37 nm. Selain itu, pola difraksi sinar-X (XRD) dari TiO 2 nano masih menunjukkan adanya puncak-puncak TiO 2 dengan fase anatase. Fotokatalis membran CA/NDC-TiO 2 nano dipreparasi melalui metode inversi fasa dengan mencampurkan TiO 2 nano dalam larutan casting CA. Analisis termogravimetri menunjukkan tiga fenomena dekomposisi dari membran CA/NDC-TiO 2 nano selaras dengan fenomena dekomposisi membran CA/NDC. Fotodegradasi metilen biru dilakukan dengan menggunakan fotokatalisator TiO 2 nano dan membran CA/NDC-TiO 2 nano selama 50 menit dengan sistem batch. Perubahan absorbansi larutan metilen biru diukur menggunakan spektrofotometer pada panjang gelombang maksimum 664,6 nm. Hasil yang diperoleh menunjukkan bahwa reaksi fotodegradasi metilen biru cenderung mengikuti reaksi orde 2. Berdasarkan nilai konstanta kecepatan reaksi, k, efektivitas fotokatalis membran CA/NDC-TiO 2 nano dengan TiO 2 nano pada proses fotodegradasi metilen biru secara statistik terhitung tidak berbeda signifikan.Kata kunci: Fotodegradasi, Membran CA/NDC-TiO 2 nano, Metilen biru, Semikonduktor

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Efficient TiO2 Powder and Film Photocatalysts with Rutile Crystal Structure

Cited by 91 publications

References 6 publications

Acetaldehyde adsorption and condensation on anatase TiO2: Influence of acetaldehyde dimerization

Acetaldehyde adsorption and condensation on anatase TiO2: Influence of acetaldehyde dimerization

Photo-Induced Surface Reaction of Highly Oriented Anatase Polycrystalline Films Synthesized Using a CVD Apparatus Operated in Atmospheric Regime

PHOTOCATALYTIC ACTIVITY OF TiO2 NANO SUPPORTED ON MEMBRANE CELLULOSE ACETATE/NATA DE COCO (CA/NDC) IN PHOTODEGRADATION OF METHYLENE BLUE

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