Influence of silver doping on the photocatalytic activity of titania films

He, Chao; Yu, Yun; Hu, Xingfang; Larbot, A.

doi:10.1016/s0169-4332(02)00927-3

Cited by 209 publications

(92 citation statements)

References 14 publications

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“…He et al [12] have investigated the effect of silver doping on the microstructure and photocatalytic activity of TiO 2 films prepared by sol-gel method. It is found that suitable silver dopant can increase the activity and the mechanism is mainly attributed to the change of anatase grain size.…”

Section: Introductionmentioning

confidence: 99%

A mechanism for enhanced photocatalytic activity of silver-loaded titanium dioxide

et al. 2004

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Section: Introductionmentioning

confidence: 99%

A mechanism for enhanced photocatalytic activity of silver-loaded titanium dioxide

et al. 2004

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“…During the last years many studies dealing with TiO 2 doping with different metals have shown the alterations that the dopant may cause on the catalyst surface [9][10][11][12] . Also, it has been observed that the dopant effect on the properties of semiconductor surface may vary according to the metal deposition method employed, type of metal used as a dopant and molecule to be degraded, among other variables.…”

Section: Oriental Journal Of Chemistrymentioning

confidence: 99%

Sol-gel Synthesis of Lanthanum, Cobalt and Titanium Oxide Composite

Riazian¹,

Ramzannezhad²

2012

Orientjchem.

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We report on the synthesis, morphology, chemically and structurally of composite nanostructure. In the present work, ternary reactive powders in the composite systems have been obtained using the sol-gel method, by the simultaneous gelation of all cations. Composite powders have been characterized by XRD, SEM, EDAX and FTIR. X-ray diffraction showed the formation of nano crystalline anatase, La 2 O 5 , La 2 O 7 Ti 2 , Co, Co 3 O 4 and CoO 2 H phases. The average crystallite size was calculated by using X-ray diffraction analysis. Scanning electron microscopy revealed that particles with spherical shapes decrease by increasing the calcinations temperatures and congestion of particles decreases with increasing the molar ratio of titanium precursor. EDX spectroscopy confirmed the composition of the ternary powders, which are formed during the gelation process. FTIR spectra showed that Co-O, La-O, Ti-O and Ti-O-La bonds are formed. The effects of chemical compositions and the strong process on the surface topography and the crystallization of anatase were studied.

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“…Bu çalışmalarda W, Ta ve Nb katkısının fotokatalitik performansı arttırdığı, Cr, Fe, V, Mn ve Co katkısının ise soğurma sınırını görünür bölgeye ötelediği tespit edilmiştir. Ayrıca, Pb, Ag, Zr, Au, Pt katkısının da TiO 2 fotokatalistine etkilerinin incelendiği çalışmalar mevcuttur (Dvoranová et al 2002;He et al 2002;Hirano et al 2003;Iwasaki et al 2000;Karakitsou et al 1993;Ranjit and Viswanathan 1997;Serpone et al 1994;Subramanian et al 2004;Yu et al 2002;Zhang et al 2006). Bu çalışmaların yanı sıra literatürde ayrıca metal olmayan katkılar ile fotokatalitik aktivitenin geliştirilmesi konusunda da çalışmalar yapılmış ve C, N, S ve B gibi katkıların görünür ışık altında fotokatalitik aktiviteye olumlu etkileri olabileceği tespit edilmiştir (Asahi et al 2001;Burda et al 2003;Irie et al 2003;Pelaez et al 2012;Reddy et al 2005;Ren et al 2007;Sakthivel and Kisch 2003;Shen et al 2006;Li et al 2005;Valentin et al 2004;Wang and Lewis 2005;Zhao et al 2005).…”

Section: Introductionunclassified

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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Influence of silver doping on the photocatalytic activity of titania films

Cited by 209 publications

References 14 publications

A mechanism for enhanced photocatalytic activity of silver-loaded titanium dioxide

A mechanism for enhanced photocatalytic activity of silver-loaded titanium dioxide

Sol-gel Synthesis of Lanthanum, Cobalt and Titanium Oxide Composite

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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