Simple fabrication of twist-like helix N,S-codoped titania photocatalyst with visible-light response

Jiang, Xu; Li, Jingxia; Dai, Wei‐Lin; Cao, Yong; Li, Hexing; Fan, Kangnian

doi:10.1016/j.apcatb.2007.10.008

Cited by 133 publications

(73 citation statements)

References 38 publications

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“…However, it is active only in the ultraviolet (UV) region because of its wide band gap (3.0-3.2 eV), which accounts for less than 5% of solar energy [3]. Recent studies have revealed that the shortcoming of TiO 2 can be overcome by doping the nonmetal elements such as nitrogen [4][5][6], boron [7], sulfur [8], carbon [9], etc. For example, Asahi et al [4] reported that N-doped TiO 2 showed photocatalytic activity for the decomposition of acetone and methylene blue in wavelengths up to 550 nm because the N 2p states contribute to the band gap narrowing by mixing with O 2p states by substitutional doping of nitrogen.…”

Section: Introductionmentioning

confidence: 99%

Solvothermal-induced phase transition and visible photocatalytic activity of nitrogen-doped titania

Liu

Qin

Zuo

et al. 2009

Journal of Hazardous Materials

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Section: Introductionmentioning

confidence: 99%

Solvothermal-induced phase transition and visible photocatalytic activity of nitrogen-doped titania

Liu

Qin

Zuo

et al. 2009

Journal of Hazardous Materials

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“…Therefore, the overall efficiency of TiO 2 remains too low under natural sunlight irradiation, as UV only accounts for about 4% of the incoming solar energy on the Earth's surface. 6 With the purpose of utilization a wider solar spectrum in the application of TiO 2 , considerable efforts have been devoted to the preparation and characterization of visible-light-active titanium dioxide (TiO 2 ) materials doped with nonmetal impurities, [7][8][9][10][11] and this strategy is regarded to be one of the most promising techniques for the harvest of sunlight by TiO 2 photocatalysts.…”

Section: Introductionmentioning

confidence: 99%

Preparation of highly visible-light active N-doped TiO2 photocatalyst

et al. 2010

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A series of N-doped anatase TiO 2 samples have been prepared using a solvothermal method in an organic amine/ethanol-water reaction system. The effects of different starting N : Ti atomic ratios on the catalysts structure, surface property and catalytic activity have been investigated. The photocatalytic activity and stability of the N-doped TiO 2 samples were evaluated through using the decomposition of Methylene blue (MB) and Methyl orange (MO) as model reaction under visible light irradiation. Characterization results show that the nitrogen dopant has a significant effect on the crystallite size and optical absorption of TiO 2 . It was found that the N-doped TiO 2 catalysts have enhanced absorption in the visible light region, and exhibit higher activity for photocatalytic degradation of model dyes (e.g. MB and MO). The catalyst with the highest performance was the one prepared using N : Ti molar ratio of 1.0. Electron paramagnetic resonance (EPR) measurement suggests the materials contain Ti 3+ ions, with both the degree of N doping and oxygen vacancies make contributions to the visible light absorption of TON. The presence of superoxide radicals (Ȯ À ) and hydroxyl radicals (OH) on the surface of TON were found to be responsible for MB and MO solution decoloration under visible light. Based on the results of the present study, a visible light induced photocatalytic mechanism has been proposed for N-doped anatase TiO 2 .

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“…Elde edilen sonuçlara göre, UV ışık altında ince film numunelerin fotokatalitik aktivitesinin toz numunelere göre daha düşük olduğu belirlenmiştir. Toz numunelerin ince filmlere kıyasla daha büyük olan yüzey alanları nedeniyle gösterdikleri yüksek fotokatalitik aktivite değerleri hesaplanan optik bant aralığı enerjisi değerleri ve mevcüt literatür ile de örtüşmektedir (Xu et al 2008 …”

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Investigation of Photocatalytic Activity of Sol-gel Derived Boron and/or Nitrogen Doped TiO2 Powder and Thin Films Under UV and Visible Light

Ersundu¹

2017

AKU-J. Sci. Eng.

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ÖzetBu çalışmada, farklı oranlarda B, N, B/N katkılı ve katkısız TiO 2 fotokatalistleri sol-jel yöntemi ile toz ve ince film formunda üretilmiştir. İnce filmler daldırmalı kaplama yöntemi ile kaplamasız ve SiO 2 ara katman kaplamalı soda kireç cam altlıklar üzerine kaplanmıştır. SiO 2 ara katman kaplamalar, TiO 2 'nin ısıl işlemi sırasında altlık malzeme olarak kullanılan soda-kireç camındaki alkali iyonların film içine difüze ederek TiO 2 'nin faz dönüşümünü engellemesini ve fotokatalitik aktivitesini düşürmesini önlemek amacıyla uygulanmıştır. Katkılı ve katkısız TiO 2 esaslı çözeltilerden elde edilen jellerin ısıl karakterizasyonları termogravimetrik diferansiyel termal analiz (TG/DTA) yöntemi ile gerçekleştirilmiştir. Elde edilen TG/DTA sonuçları ışığında, TiO 2 'nin fotokatalitik aktivitesi en yüksek olan anataz fazının kristalizasyon sıcaklığı belirlenmiştir. Anataz fazının kristalizasyon sıcaklığı ve cam altlık malzemenin cam geçiş sıcaklığı göz önünde bulundurularak, fotokatalistler hava ortamında 500 °C'de 1 saat ısıl işleme tabi tutulmuş ve fırın içerisinde oda sıcaklığına soğutulmuştur. Toz haldeki fotokatalistlerin faz karakterizasyonları X-ışınları difraksiyonu (XRD) tekniği ile, ince filmlerin optik karakterizasyonları ise UV-Vis spektrofotometre yöntemi ile gerçekleştirilmiştir. TiO 2 yapısında katkı olarak B ve N'nin ayrı ayrı ve eşzamanlı bulunmasının mor ötesi ve görünür ışık fotokatalitik aktivitesine etkisi, organik bir kirlilik olan metilen mavisinin bozunması ile tespit edilmiştir. Metilen mavisinin bozunmasıyla fotokatalitik aktivite kinetik açıdan incelenmiş ve fotokatalistlerin fotokatalitik aktivite hız sabitleri hesaplanmıştır. Investigation of Photocatalytic Activity of Sol-gel Derived Boron and/or Nitrogen Doped TiO 2 Powder and Thin Films Under UV and Visible LightKeywords TiO 2 ; Sol-gel; Thin film; Photocatalytic activity AbstractIn this study, B, N, B/N doped and bare TiO 2 photocatalysts were synthesized in powder and thin film form using sol-gel method. Thin films were dip-coated on bare and SiO 2 precoated soda-lime glass substrates. The alkali ions in the glass structure suppress crystallization of TiO 2 and degrade the photocatalytic activity; therefore SiO 2 coating was applied as an interlayer to prevent alkali ion diffusion into sol-gel prepared thin film during heat-treatment process. Thermal characterizations of doped and undoped gels obtained from different TiO 2 -based sols were carried out using thermogravimetric differential thermal analysis technique (TG/DTA). According to the TG/DTA results, crystallization temperature of anatase phase, which has the highest photocatalytic activity among all TiO 2 polymorphs, was determined. Considering the crystallization temperature of anatase and glass transition temperature of substrates, the samples were heat-treated at 500 °C in air, waited 1 hour at this temperature and cooled down to room temperature in the furnace. Phase analysis was realized with powder samples using X-ray diffraction (XRD) analysis and optical spectra o...

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Simple fabrication of twist-like helix N,S-codoped titania photocatalyst with visible-light response

Cited by 133 publications

References 38 publications

Solvothermal-induced phase transition and visible photocatalytic activity of nitrogen-doped titania

Solvothermal-induced phase transition and visible photocatalytic activity of nitrogen-doped titania

Preparation of highly visible-light active N-doped TiO2 photocatalyst

Investigation of Photocatalytic Activity of Sol-gel Derived Boron and/or Nitrogen Doped TiO2 Powder and Thin Films Under UV and Visible Light

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