Morphology and optical studies of Cr doped TiO2 and Mixed-Halide Perovskite coated rutile TiO2 nanorods

Jaffari, G. Hassnain; Ali, Wajid; Ain, Qurat Ul; Gul, Mahreen; Hassan, Qadeer Ul; Ali, Awais; Wasiq, M.F.; Zhou, Jianping

doi:10.1016/j.jallcom.2018.09.328

Cited by 18 publications

(8 citation statements)

References 69 publications

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“…There have been numerous studies on the introduction of various metals, including transition metals (Fe, Co, Mn, and Cr), [43][44][45][46][47] main group metals (Sn and Bi), [48][49][50] and rare earth metals (Er and Yb), [51,52] as dopants into the TiO 2 lattice. In general, the doped metals can build donor states below the CB of TiO 2 , leading to the narrowing of bandgap and the absorption of visible light.…”

Section: Metal Dopingmentioning

confidence: 99%

Visible‐Light Responsive TiO₂‐Based Materials for Efficient Solar Energy Utilization

Zhang

et al. 2020

Advanced Energy Materials

150

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currents, geothermal, biomass, and solar, have been developed as alternatives. Among them, solar energy is the most abundant, inexpensive, nonpolluting, and sustainable. [5][6][7][8] Some semiconductors, so called photocatalysts, which possess the capacity to harvest solar energy to drive catalytic reactions for valuable chemical production, have been designed and fabricated to achieve efficient solar energy utilization. [9][10][11][12][13][14][15][16][17][18][19] Typically, TiO 2 is recognized as one of the most promising candidates due to its chemical stability, nontoxicity, and high resistance to photocorrosion. [20][21][22][23][24][25] In general, TiO 2 possesses three major phases, including anatase, rutile and brookite, and many other minor phases, such as monoclinic TiO 2 (B). All of them have wide bandgaps of 3.0-3.2 eV. Hence, TiO 2 can only absorb ultraviolet light (UV), while the visible light accounting for ≈43% of solar energy cannot be utilized. Furthermore, the rapid recombination of photogenerated electrons and holes severely limits its quantum efficiency. Thus, overall photocatalytic activity of TiO 2 is very limited, especially under visiblelight irradiation. [26][27][28] A complete photocatalytic reaction using TiO 2 -based photocatalysts involves three major steps: i) light absorption and The photocatalytic properties of TiO 2 have aroused a broad range of research interest since 1972 due to its abundance, chemical stability, and easily available nature. To increase its overall activity, in the past few decades, much effort has been devoted to the fabrication of advanced TiO 2 -based photocatalysts with visible-light response and these photocatalysts have shown great potential in the field of solar energy utilization. Here, recent progress in the investigation of visible-light responsive TiO 2 -based materials are reviewed. Notably, the fabrication strategies and corresponding chemical/ physical properties of visible-light responsive TiO 2 -based materials are described in detail, with a focus on bandgap engineering and junction engineering from the perspective of light absorption, charge transfer and separation, and surface reactions. Their applications in solar-fuel production, organic synthesis, bacterial disinfection, pollutant degradation and nitrogen fixation are also discussed. Moreover, the new trends and ongoing challenges in this field are proposed and highlighted.

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Section: Metal Dopingmentioning

confidence: 99%

Visible‐Light Responsive TiO₂‐Based Materials for Efficient Solar Energy Utilization

Zhang

et al. 2020

Advanced Energy Materials

150

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“…In 1977, Guth’s group reported for the first time that Fe-doped TiO 2 powder can be used to reduce nitrogen as a photocatalyst. ,, The researchers also demonstrated that transition-metal doping is an effective method to promote the photocatalytic performance for H 2 production. − Among them, nickel is one of the most important dopant ions because of its good optical and electrochemical properties as well as unique electron configuration. − Ni-based catalysts (NiS, Ni 2 P, Ni–Sn) have been demonstrated as an effective catalyst for H 2 production from water or biomass because H prefers to adsorb on the Ni site. In N 2 fixation to form NH 3 , it includes N 2 activation and H 2 addition.…”

Section: Introductionmentioning

confidence: 99%

Vacancy-Enabled Mesoporous TiO₂ Modulated by Nickel Doping with Enhanced Photocatalytic Nitrogen Fixation Performance

Wang

Guan

et al. 2020

ACS Sustainable Chem. Eng.

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Photocatalysis provides a sustainable route to convert N 2 to NH 3 with the aid of a photogenerated electron. Beyond the typical issue in the photocatalytic field, NH 3 synthesis requires adsorption, activation, and hydrogenation of N 2 . In this report, Ni-doped TiO 2 (Ni-x-TiO 2 ) photocatalysts were fabricated by a simple sol−gel method to introduce the oxygen defects and Ni site on TiO 2 . The oxygen vacancy (Vo) enhances the adsorption of N 2 on the catalyst surface. The Ni doping induced a defect energy level below the conduction band, which prefers to accept the photogenerated electron. The electron captured by Vo tends to transfer to the adsorbed N 2 and activate N 2 . On the other hand, the Ni site is a typical H 2 production site. It provides enough H 2 for the hydrogenation of N 2 to form NH 3 . To sum up all of these advantages, Ni-doped TiO 2 displays a high NH 3 production rate of 46.80 μmol•g −1 •h −1 which is about 7 times higher than that of pure TiO 2 . This manuscript provides a potential method to design a highly efficient photocatalyst for the NH 3 synthesis.

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“…Nevertheless, in both cases ( Figure 3 , inset), slightly red-shifted TiO 2 -related bands are shown: from 148 cm −1 up to 142 cm −1 . Since the red-shift of Raman signals has been reported as an effect of the formation of oxygen vacancies in the Ti IV lattice [ 39 ], it suggests a “doping effect” of the polymer on the titanium dioxide.…”

Section: Resultsmentioning

confidence: 99%

TiO2-Based Nanocomposites Thin Film Having Boosted Photocatalytic Activity for Xenobiotics Water Pollution Remediation

et al. 2021

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Photocatalytic remediation represents a potential sustainable solution to the abatement of xenobiotic pollutants released within the water environment. Aeroxide® P25 titanium dioxide nanoparticles (TiO2 NPs) are well-known as one of the most efficient photocatalysts in several applications, and have also been investigated in water remediation as suspended powder. Recently, their application in the form of thin films has been revealed as a potential alternative to avoid time-consuming filtration processes. Polymers represent suitable substrates to immobilize TiO2 NPs, allowing further production of thin films that can be exploited as a photoactive coating for environmental remediation. Nevertheless, the methods adopted to immobilize TiO2 NPs on polymer matrix involve time-consuming procedures and the use of several reactants. Here, titanium dioxide-based nanocomposites (NCx) were obtained through a new approach based on Methyl Methacrylate in situ bulk polymerization and were compared with a blended mixture (BL). Their morphology and chemical–physical properties were investigated through Thermogravimetric Analysis (TGA), Differential Scanning Calorimetry (DSC), UV–Vis, and Raman spectroscopies. It was revealed that the in situ approach deeply influences the chemical–physical interactions between the polymer matrix and TiO2 NPs. Photocatalytic experiments revealed the boosted photodegradation activity of NCx thin films, induced by the in situ approach. The photodegradation of paraquat and acetaminophen was also ascertained.

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Morphology and optical studies of Cr doped TiO2 and Mixed-Halide Perovskite coated rutile TiO2 nanorods

Cited by 18 publications

References 69 publications

Visible‐Light Responsive TiO₂‐Based Materials for Efficient Solar Energy Utilization

Visible‐Light Responsive TiO₂‐Based Materials for Efficient Solar Energy Utilization

Vacancy-Enabled Mesoporous TiO₂ Modulated by Nickel Doping with Enhanced Photocatalytic Nitrogen Fixation Performance

TiO2-Based Nanocomposites Thin Film Having Boosted Photocatalytic Activity for Xenobiotics Water Pollution Remediation

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Morphology and optical studies of Cr doped TiO2 and Mixed-Halide Perovskite coated rutile TiO2 nanorods

Cited by 18 publications

References 69 publications

Visible‐Light Responsive TiO2‐Based Materials for Efficient Solar Energy Utilization

Visible‐Light Responsive TiO2‐Based Materials for Efficient Solar Energy Utilization

Vacancy-Enabled Mesoporous TiO2 Modulated by Nickel Doping with Enhanced Photocatalytic Nitrogen Fixation Performance

TiO2-Based Nanocomposites Thin Film Having Boosted Photocatalytic Activity for Xenobiotics Water Pollution Remediation

Contact Info

Product

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Visible‐Light Responsive TiO₂‐Based Materials for Efficient Solar Energy Utilization

Visible‐Light Responsive TiO₂‐Based Materials for Efficient Solar Energy Utilization

Vacancy-Enabled Mesoporous TiO₂ Modulated by Nickel Doping with Enhanced Photocatalytic Nitrogen Fixation Performance