Photoadsorption and photocatalysis at rutile surfaces I. Photoadsorption of oxygen

Bickley, R.I.; Stone, F. S.

doi:10.1016/0021-9517(73)90310-2

Cited by 175 publications

(58 citation statements)

References 12 publications

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“…It can be considered that the electrons transport from the catalyst to O 2 adsorbed on the surface of catalyst is the crucial step of the photocatalysis oxidation. Nevertheless, the adsorption capacity of O 2 lies on strongly flue gas humidity, O 2 will be not adsorbed on the surface of TiO 2 if flue gas is completely dry [10] . Hence, the higher removal efficiency of SO 2 may be related to physical adsorption on the surface of the catalyzer [11] .…”

Section: Effect Of O 2 On Removal Efficiencymentioning

confidence: 99%

Study on method and mechanism for simultaneous desulfurization and denitrification of flue gas based on the TiO2 photocatalysis

Zhao

Han

et al. 2008

Sci. China Ser. E-Technol. Sci.

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Based on the TiO 2 photocatalysis mechanism, a new method of simultaneous desulfurization and denitrification from flue gas was proposed. Preparation of TiO 2 photocatalyst, design of photocatalysis reactor and influencing factors for simultaneous removal of SO 2 and NO, and removal mechanism of SO 2 and NO were studied. After the optimal values of concentration of O 2 in flue gas, the relative humidity of flue gas and the irradiation time in the photocatalysis reactor were used, the efficiencies of removal for SO 2 and NO can be achieved above 98% and about 67%, respectively. According to the results of removal products analysis, the removal mechanism of SO 2 and NO based on TiO 2 photocatlysis can be put forward, namely, SO 2 was oxidized to SO 3 partly, the bulk of NO was oxidized to NO 2 , and both were removed by resorbing finally.TiO 2 photocatalysis, flue gas, simultaneous desulfurization and denitrification, reaction mechanism In order to protect air environment, technologies such as wet limestone-gypsum process, flue gas circulating fluidized bed (CFB) process and sea water desulfurization process and so on are adopted to remove SO 2 from flue gas in power plant, among which wet limestone-gypsum technology is the most commonly used. For removal of NO x , selective catalytic reduction (SCR) or selective non-catalytic reduction (SNCR) is usually installed after the desulfurization equipment, namely fractional removal, in which the yard area and the operating cost will be increased. So this technology of combined removal of SO 2 and NO is difficult to apply any more. To reduce the cost of flue gas purification, development of new technologies and equipment of simultaneous flue gas desulfurization and denitrification is necessary.TiO 2 is the commonest photocatalyst due to its favorable chemical properties, high stability and low cost. Its interest in wastewater and air treatment has received much attention lately. Significant achievements in basic researches and applications have been made [1][2][3] . A cogent and

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Section: Effect Of O 2 On Removal Efficiencymentioning

confidence: 99%

Study on method and mechanism for simultaneous desulfurization and denitrification of flue gas based on the TiO2 photocatalysis

Zhao

Han

et al. 2008

Sci. China Ser. E-Technol. Sci.

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“…It is also worth noting that adsorbed molecular water and surface hydroxyl groups play a decisive role in the degradation process, since they allow the formation of OH ~ radicals responsible for the photocatalytic reaction at the TiO2 surface, on exposure to ultra-violet radiation [23,24]. A fairly good agreement has been found with such a description, in fact samples with lower Rexp values (smaller hydration) are less reactive to participation in the photoprocess.…”

Section: Discussionmentioning

confidence: 79%

Surface properties of TiO2 modified with zinc ions

1981

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The surface properties of Ti02 modified with zinc ions have been studied. Zinc ions mainly segregate at the surface and their removal occurs at acid pH, while at basic pH both the bulk and the surface zinc contents are not affected. Different surface oxygen species were observed and identified: the species at 529.7 eV, is attributed to lattice oxygen ions, the others, at higher energies, are oxygen-containing groups due to surface hydration. A direct correlation was found between the surface zinc concentration and the photostability of the TiO2 samples.

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“…The effect of the chemical and physical properties of TiO 2 on the photocatalytic activity, such as the phase structure, crystallinity, particle size, surface area, exposed crystal facets, and population of surface OH groups, has been extensively studied [5][6][7][8][9][10][11][12]. Among these factors, the influence of the surface OH is an important factor, which is ascribed to the fact that they cannot only accept photogenerated holes to form hydroxyl radicals ( • OH) [1,[13][14][15][16][17], the principal reactive oxidant in photocatalytic reaction, but also serve as active sites for the adsorption of reactants and their intermediates [18][19][20], such as O 2 , H 2 O, and organic pollutants. To reveal the functional role of OH groups in photocatalysis process, a lot of works have been devoted to characterize the nature, distribution, categories, and photocatalytic behaviors of the OH group on TiO 2 surface [9,17,[20][21][22][23][24][25].…”

Section: Introductionmentioning

confidence: 99%