Photocatalytic Semiconductors

doi:10.1007/978-3-319-10999-2

Cited by 71 publications

(8 citation statements)

References 320 publications

(445 reference statements)

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“…Minero et al [21] has investigated that OH • has higher oxidizing power as compared to other oxidizing agents as it has the oxidation potential of +2.80 eV slightly less than that of Fluorine +2.87 eV. There are many studies which support the reactivity of OH • as an oxidant [22]. Turchi and Ollis [23] have proposed the four ways by which the OH • oxidizes the pollutant, Figure 5.…”

Section: Schematic Illustration Of Different Types Of Semiconductors mentioning

confidence: 99%

“…When a semiconductor is doped with an acceptor atom, it is converted into p-type SC, because the acceptor atom is reduced by accepting electrons from VB and increases the production of holes and vice versa. Once SC is doped with any specie, it is supposed to increase the absorption of light in the visible spectrum and the doping material will not disturb the structural or chemical integrity of the SC [22]. The doping positions of dopants are given in Figure 6.…”

Section: Doping/grafting Of Semiconductor Photocatalystsmentioning

confidence: 99%

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Semiconductor Nanocomposites for Visible Light Photocatalysis of Water Pollutants

Imtiaz¹,

Rashid²,

Xu³

2019

Concepts of Semiconductor Photocatalysis

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Semiconductor photocatalysis gained reputation in the early 1970s when Fujishima and Honda revealed the potential of TiO 2 to split water in to hydrogen and oxygen in a photoelectrochemical cell. Their work provided the base for the development of semiconductor photocatalysis for the environmental remediation and energy applications. Photoactivity of some semiconductors was found to be low due to larger band gap energy and higher electron-hole pair recombination rate. To avoid these problems, the development of visible light responsive photocatalytic materials by different approaches, such as metal and/or non-metal doping, codoping, coupling of semiconductors, composites and heterojunctions materials synthesis has been widely investigated and explored in systematic manner. This chapter emphasizes on the different type of tailored photocatalyst materials having the enhanced visible light absorption properties, lower band gap energy and recombination rate of electron-hole pairs and production of reactive radical species. Visible light active semiconductors for the environmental remediation purposes, particularly for water treatment and disinfection are also discussed in detail. Studies on the photocatalytic degradation of emerging organic compounds like cyanotoxins, VOCs, phenols, pharmaceuticals, etc., by employing variety of modified semiconductors, are summarized, and a mechanistic aspects of the photocatalysis has been discussed.

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Section: Schematic Illustration Of Different Types Of Semiconductors mentioning

confidence: 99%

Section: Doping/grafting Of Semiconductor Photocatalystsmentioning

confidence: 99%

Semiconductor Nanocomposites for Visible Light Photocatalysis of Water Pollutants

Imtiaz¹,

Rashid²,

Xu³

2019

Concepts of Semiconductor Photocatalysis

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“…Recently, the scientific community has shown a crescent interest in photocatalytic materials for environmental applications, since the use of these materials might lead to the development of sustainable technologies that allow cleaning the environment in a safe and effective way. Besides, they can be employed in clean energy production by hydrogen economy [1].…”

Section: -Introductionmentioning

confidence: 99%

Optical and Structural Characterization of Bi2FexNbO7 Nanoparticles for Environmental Applications

2020

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Photocatalytic materials development is very important in the environmental perspective. They can be employed in clean energy production by hydrogen generation as well as in wastewater treatment by photocatalysis. One of the key subjects in this area is the advancement of materials with low band gap, thus the catalyst can use the sunlight more efficiently. Based on this issue, this research aims to develop photocatalysts based on bismuth, niobium and iron (Bi2FexNbO7), analyze the influence of iron concentration (x = 0, 0.8, 1 and 1.2) and characterize through optical and structural analysis. The powder samples were synthetized by sol gel method. Band gap estimation was performed throw UV-Vis analysis and Kubelka-Munk method. XRD technique was employed to phase determination and structural characterization. The catalyst with no iron (Bi2NbO7) presented a mix of three phases from reagents and a band gap of 3.14 eV. The iron addition promotes crystalline photocatalysts with high visible light absorption ability and hence lower band gap, 2.09 eV. Further analysis must be performed; however, based on structural and optical proprieties, these materials can efficiently be employed both in wastewater treatment and hydrogen production.

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“…The photocatalytic reaction had gained tremendous interest in last decades due to its potential to degrade and mineralize most of the organic pollutant through utilizing the photon energy from the light source 7 . Several semiconductors such as TiO2, ZnO, SnO2, and Sn3O4 have been successfully explored as photocatalyst and possess excellent performance in the degradation of organic pollutants [8][9][10] . Among them, Sn3O4 has promoted higher efficiency performance when activated by visible-light radiation (λ>390 nm) due to its narrow band gap (~2.5 -2.9 eV).…”

Section: Introductionmentioning

confidence: 99%

HIGH EFFICIENT VISIBLE-LIGHT ACTIVATED PHOTO CATALYTIC SEMICONDUCTOR SnO2/Sn3O4 HETEROSTRUCTURE IN DIRECT BLUE 71 (DB71) DEGRADATION

Huda¹,

Mahendra²,

Ichwani³

et al. 2019

RJC

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The SnO2/Sn3O4 were successfully prepared using a one-step hydrothermal method and exhibit the heterostructure formation. The heterostructure formation facilitates the enhancing of visible-light photoresponse of SnO2 which well known as the UV-light activated semiconductor. The heterostructure formation also exhibits high efficient photocatalytic performance by completely degrading 10 ppm of DB71 in 120 minutes after adding 50 mg of prepared-Tin oxide with a kinetic rate constant of 4.636 x 10 -2 min -1 . The kinetic constant rate of prepared-Tin oxide has 2.5 and 3 times faster compared to the kinetic constant rates of SnO2 and Sn3O4, respectively. The high efficient photocatalytic degradation was generated by the improvement of carrier mobilities through manipulating band alignment between SnO2 and Sn3O4 and prevented the recombination of photogenerated hole-electron which commonly generated in the intrinsic semiconductor. Heterostructure SnO2/Sn3O4 was not only forming high-efficiency photocatalytic degradation but also exhibiting blue shifting phenomenon. The UV-Vis adsorption response approaches were used to investigate and propose the photocatalytic degradation mechanism. After 120 minutes, there were only benzene adsorption peaks detected indicating the mineralization of DB71 dyes.

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Photocatalytic Semiconductors

Cited by 71 publications

References 320 publications

Semiconductor Nanocomposites for Visible Light Photocatalysis of Water Pollutants

Semiconductor Nanocomposites for Visible Light Photocatalysis of Water Pollutants

Optical and Structural Characterization of Bi2FexNbO7 Nanoparticles for Environmental Applications

HIGH EFFICIENT VISIBLE-LIGHT ACTIVATED PHOTO CATALYTIC SEMICONDUCTOR SnO2/Sn3O4 HETEROSTRUCTURE IN DIRECT BLUE 71 (DB71) DEGRADATION

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