Hydrothermal synthesis and photocatalytic characterizations of transition metals doped nano TiO2 sols

Lee, K.; Lee, N.H.; Shin, Seunghan; Lee, H.G.; Kim, S.J.

doi:10.1016/j.mseb.2005.12.032

Cited by 55 publications

(32 citation statements)

References 12 publications

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“…It meant that SnO2 after calcination could substitute the TiO2 defect on the surface. These morphologies corresponded to the previous research of K. Lee et al [21] and C.K. Rhee et al [22], respectively.…”

Section: 1supporting

confidence: 92%

Studies on SnCl2-doped TiO2 photocatalyst for Pyrocatechol Photodegradation

Lecante¹,

Shotika

Phiyanalinmat

2014

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Abstract. SnCl2-doped TiO2 photocatalyst for pyrocatechol photodegradation aimed to examine the effect of Sn/Ti ratio and H2O2+UVC irradiation. The preparation was carried out by the impregnation and the characterization consisted of WAXD, SEM, and laser particle size. Using 1 mM pyrocatechol in the CSTR with various TiO2 photocatalysts, the remaining pyrocatechol was determined by UV-vis spectrophotometry to calculate % photodegradation. From WAXD results, it was found that SnO2 incorporation to the TiO2 bulk phase but the morphologies did not change. And the particle size changed due to the attraction force of the surface charging. Without H2O2 addition, it showed 15.7% photodegradation by TiSn10UVC compared to 11.37% of TiDark. Thus, UVC was the important factor for photodegradation. With H2O2+UVC irradiation, the maximum photodegradation reached 34.6% by TiSn10HOUVC, but those of HOUVC and TiHOUVC showed 25.0% and 26.5%, respectively. The Sn-doping affected the formation of more hydroxyl free radical from H2O2+UVC irradiation and charge separation. But higher Sn/Ti ration, it gave segregate SnO2 which increased recombination center with the adverse effect on the lower photodegradation. The conclusion revealed that SnCl2-doping with the ratio of Sn/Ti =10 onto TiO2 photocatalyst showed the highest photoactivity with H2O2+UVC irradiation. Moreover, the chemical kinetics is also discussed.

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Section: 1supporting

confidence: 92%

Studies on SnCl2-doped TiO2 photocatalyst for Pyrocatechol Photodegradation

Lecante¹,

Shotika

Phiyanalinmat

2014

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“…The chromium removal treatment includes precipitation, ion exchange, photocatalysis, reverse osmosis, and adsorption process (Lin et al 1993). Most of these methods require high capital and recurring expenditure and consequently they are not suitable for small-scale industries (Lee et al 2006;Chenthamarakshan et al 2000). Among all the aforementioned methods, photocatalysis is a highly effective and cheap process than the other methods.…”

Section: Introductionmentioning

confidence: 99%

Photocatalytic degradation of Chromium (VI) from wastewater using nanomaterials like TiO2, ZnO, and CdS

Joshi¹,

Shrivastava²

2011

Appl Nanosci

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The photocatalytic degradation of Cr(VI) from wastewater by using nanomaterials TiO 2 , ZnO, and CdS. All the experiments were carried out in the batch process. The wastewater obtained from various industries. The amount of chromium was removed using photocatalyst with UV light and in the dark at different pH range. The maximum removal of Cr(VI) was observed at pH 2; out of these photocatalyst TiO 2 showed highest capacity for Cr(VI) removal than TiO 2 thin film. The removal of chromium has been studied by considering influent concentration, loading of photocatalyst, pH, and contact time as operating variables. The degradation was characterized by FTIR, XRD, SEM, and EDX analysis before and after application of photocatalysts.

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“…Concerning the activity under sub-bandgap irradiation of TiO 2 , e.g., [100][101][102][103], on the basis of an ensemble of experimental and theoretical methods [102,103], it was determined that, in some cases, this activity was really due to the existence of new energy levels corresponding to the foreign cations. However, in other cases, depending on the preparation of doped TiO 2 , other phenomena might be at the origin of the observed activity, viz., a photo-Fenton reaction occurring between hydrogen peroxide formed in situ and the cations located at the surface (potentially, partially dissolved in the case of aqueous-phase reactions); surface complexes, formed with the foreign cations, which are susceptible to be excited by sub-bandgap irradiation.…”

Section: Effects Of Cation Dopingmentioning

confidence: 99%

Fundamentals of TiO2 Photocatalysis. Consequences for Some Environmental Applications

Pichat

2015

Green Chemistry and Sustainable Technology

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This chapter considers the fundamental phenomena occurring when TiO 2 is excited by photons. The focus is first on the formation and fate of the charges generated by the excitation. Then, the roles in photocatalytic reactions of water and oxygen which are almost always present are presented and discussed; the effects of adding ozone or hydrogen peroxide are also briefly indicated. Regarding the photocatalytic degradation of organic compounds -which is involved in potential applications such as self-cleaning materials and air or water purification -the following issues are examined: the hole-induced and hydroxyl radical-induced pathways and the predictability of the nature of the intermediate products. Some of the material aspects of photocatalysis are dealt with through (1) the influence of the structural and textural characteristics of pristine TiO 2 , (2) the effects of modifying TiO 2 by metal deposits or ion doping, and (3) the basic outcomes of combining TiO 2 with either another oxide (insulating or semiconducting) or a supplementary adsorbent of high surface area. Conclusions are drawn from these fundamental topics about the applicability of TiO 2 photocatalysis.

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Hydrothermal synthesis and photocatalytic characterizations of transition metals doped nano TiO2 sols

Cited by 55 publications

References 12 publications

Studies on SnCl2-doped TiO2 photocatalyst for Pyrocatechol Photodegradation

Studies on SnCl2-doped TiO2 photocatalyst for Pyrocatechol Photodegradation

Photocatalytic degradation of Chromium (VI) from wastewater using nanomaterials like TiO2, ZnO, and CdS

Fundamentals of TiO2 Photocatalysis. Consequences for Some Environmental Applications

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