Preparation of Bi-doped TiO2 nanoparticles and their visible light photocatalytic performance

Li, Haiyan; Liu, Jinfeng; Qian, Junjie; Li, Qiuye; Yang, Jianjun

doi:10.1016/s1872-2067(14)60124-8

Cited by 36 publications

(13 citation statements)

References 42 publications

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“…As described, the cationic doping essentially introduces the intra-band energy levels close to the CB of TiO 2 , which leads to the red shift in the optical property of the system and it is also observed in various cations such as transition metal, [61][62][63], rare-earth [64][65][66], and other metals [67][68][69] doped TiO 2 . However, the main drawback of the cation doping is the creation of more trapping sites for charge carriers (both electrons and holes) that considerably reduces the efficiency of the photocatalyst.…”

Section: Cationic Doping In Tiomentioning

confidence: 90%

Insights into the TiO2-Based Photocatalytic Systems and Their Mechanisms

Sakar

Prakash

2019

Catalysts

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Photocatalysis is a multifunctional phenomenon that can be employed for energy applications such as H2 production, CO2 reduction into fuels, and environmental applications such as pollutant degradations, antibacterial disinfection, etc. In this direction, it is not an exaggerated fact that TiO2 is blooming in the field of photocatalysis, which is largely explored for various photocatalytic applications. The deeper understanding of TiO2 photocatalysis has led to the design of new photocatalytic materials with multiple functionalities. Accordingly, this paper exclusively reviews the recent developments in the modification of TiO2 photocatalyst towards the understanding of its photocatalytic mechanisms. These modifications generally involve the physical and chemical changes in TiO2 such as anisotropic structuring and integration with other metal oxides, plasmonic materials, carbon-based materials, etc. Such modifications essentially lead to the changes in the energy structure of TiO2 that largely boosts up the photocatalytic process via enhancing the band structure alignments, visible light absorption, carrier separation, and transportation in the system. For instance, the ability to align the band structure in TiO2 makes it suitable for multiple photocatalytic processes such as degradation of various pollutants, H2 production, CO2 conversion, etc. For these reasons, TiO2 can be realized as a prototypical photocatalyst, which paves ways to develop new photocatalytic materials in the field. In this context, this review paper sheds light into the emerging trends in TiO2 in terms of its modifications towards multifunctional photocatalytic applications.

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Section: Cationic Doping In Tiomentioning

confidence: 90%

Insights into the TiO2-Based Photocatalytic Systems and Their Mechanisms

Sakar

Prakash

2019

Catalysts

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“…Compared to nonmetal dopant, substitution of metal ions can introduce an intraband state close to CB edge, which results in an obvious red shift in bandgap adsorption due to sub-band gap energies, such as transition metal doping [154][155][156], rare-earth metal doping [157][158][159], and other metal doping [160][161][162].…”

Section: Metal Dopantsmentioning

confidence: 99%

Influences of Doping on Photocatalytic Properties of TiO2 Photocatalyst

Huang¹,

Yan²,

Zhao³

2016

Semiconductor Photocatalysis - Materials, Mechanisms and Applications

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As a kind of highly effective, low-cost, and stable photocatalysts, TiO 2 has received substantial public and scientific attention. However, it can only be activated under ultraviolet light irradiation due to its wide bandgap, high recombination, and weak separation efficiency of carriers. Doping is an effective method to extend the light absorption to the visible light region. In this chapter, we will address the importance of doping, different doping modes, preparation method, and photocatalytic mechanism in TiO 2 photocatalysts. Thereafter, we will concentrate on Ti 3+ self-doping, nonmetal doping, metal doping, and codoping. Examples of progress can be given for each one of these four doping modes. The influencing factors of preparation method and doping modes on photocatalytic performance (spectrum response, carrier transport, interfacial electron transfer reaction, surface active sites, etc.) are summed up. The main objective is to study the photocatalytic processes, to elucidate the mechanistic models for a better understanding the photocatalytic reactions, and to find a method of enhancing photocatalytic activities.

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“…This phenomenon may be due to that the absorption intensity exhibited Fe/N/Co–TiO 2 in the ultraviolet region was higher than that of visible light (according to the UV-Vis results above). Furthermore, the energy of ultraviolet light is higher than that of visible light, and it is easier to generate more photoelectrons for photocatalytic reaction when Fe/N/Co–TiO 2 is irradiated [56]. It is obvious that photocatalytic coating is effective at degrading the main harmful gas in VE under visible light irradiation.…”

Section: Resultsmentioning

confidence: 99%

The Photocatalytic Degradation of Vehicle Exhausts by an Fe/N/Co–TiO2 Waterborne Coating under Visible Light

et al. 2019

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Based on the three-dimensional network structure of a polymer and the principle of photocatalysts, a visible-light-responsive and durable photocatalytic coating for the degradation of vehicle exhaust (VE) has been constructed using a waterborne acrylic acid emulsion as the coating substrate; Fe/N/Co–TiO2 nanoparticles (NPs) as photocatalytic components; and water, pigments, and fillers as additives. The visible-light-responsive Fe/N/Co–TiO2 NPs with an average size of 100 nm were prepared by sol-gel method firstly. The co-doping of three elements extended the absorption range of the modified TiO2 nanoparticles to the visible light region, and showed the highest light absorption intensity, which was confirmed by the ultraviolet-visible absorption spectra (UV-Vis). X-ray diffraction (XRD) measurements showed that element doping prevents the transition from anatase to rutile and increases the transition temperature. TiO2 was successfully doped due to the reduction of the chemical binding energy of Ti, as revealed by X-ray photoelectron spectroscopy (XPS). The degradation rates of NOX, CO, and CO2 in VE by Fe/N/Co–TiO2 NPs under visible light were 71.43%, 23.79%, and 21.09%, respectively. In contrast, under the same conditions, the degradation efficiencies of coating for VE decreased slightly. Moreover, the elementary properties of the coating, including pencil hardness, adhesive strength, water resistance, salt, and alkali resistance met the code requirement. The photocatalytic coating exhibited favorable reusability and durability, as shown by the reusability and exposure test.

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Preparation of Bi-doped TiO2 nanoparticles and their visible light photocatalytic performance

Cited by 36 publications

References 42 publications

Insights into the TiO2-Based Photocatalytic Systems and Their Mechanisms

Insights into the TiO2-Based Photocatalytic Systems and Their Mechanisms

Influences of Doping on Photocatalytic Properties of TiO2 Photocatalyst

The Photocatalytic Degradation of Vehicle Exhausts by an Fe/N/Co–TiO2 Waterborne Coating under Visible Light

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