Fast monitoring of organic dye degradation coupled with a colorimetric approach in a Ag-modified TiO2 nanotube photocatalytic system

Guo, Cheng; Han, Cui-Yan; Zhou, Kai; Huo, Guo-Na; Zhang, Shasha; Wang, Gui‐Chang; Zhang, Shoumin; Huang, Wei‐Ping; Zhu, Baolin

doi:10.1016/j.ceramint.2022.12.128

Cited by 6 publications

(4 citation statements)

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“…Fe–TiO 2 demonstrated a significant red shift in light absorption. It suggests that the light absorption band edge of the catalysts is extended to visible wavelengths and also means that the sample has excellent light absorption ability and enhanced light collection ability upon Fe doping . The Kubelka–Munk formula (1) was used to calculate the band gap width ( α hv ) 1 / n = A false( italichv − E normalg false) where α is the absorption coefficient, ν represents the optical frequency, E g denotes the semiconductor band gap width, and A represents the absorption constant and n is directly related to the type of semiconductor material and n = 2 for the indirect band gap semiconductor.…”

Section: Resultsmentioning

confidence: 99%

“…It suggests that the light absorption band edge of the catalysts is extended to visible wavelengths and also means that the sample has excellent light absorption ability and enhanced light collection ability upon Fe doping. 53 The Kubelka−Munk formula (1) was used to calculate the band gap width where α is the absorption coefficient, ν represents the optical frequency, E g denotes the semiconductor band gap width, and A represents the absorption constant and n is directly related to the type of semiconductor material and n = 2 for the indirect band gap semiconductor. The calculated band gap energy level of pure TiO 2 was estimated to be 3.24 eV, which is consistent with the actual band gap energy level of anatase; the band gap energies estimated from the intercept of the tangents to the plots by using the K−M formula were 3.14, 3.04, and 3.15 eV for 1% Fe−TiO 2 , 2% Fe−TiO 2 , and 3% Fe−TiO 2 , respectively.…”

Section: Optical Propertiesmentioning

confidence: 99%

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Hollow Fe³⁺-Doped Anatase Titanium Dioxide Nanosphere for Photocatalytic Degradation of Organic Dyes

Hu,

Yang,

Wang

et al. 2023

ACS Appl. Nano Mater.

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In recent years, the development and application of semiconductor materials with excellent photocatalytic properties have been paid wide attention in addressing the issue of water pollution. Hollow nanospheres of titanium dioxide (TiO 2 ), doped with Fe ions, have been fabricated through the hard template method for photocatalytic degradation of organic pollutants. The hierarchical nanospheres were synthesized using hydrothermal carbon spheres as a template, resulting in an average diameter of about 200 nm, a mesoporous structure characterized by a remarkably large specific surface area, and uniform dispersion of Fe on the surface of hollow TiO 2 . In this study, the effect of operating parameters such as catalyst concentration and environmental conditions on the degradation of rhodamine dyes by catalysts was investigated. The optimal Fe dopant content of TiO 2 was 2.0%, exhibiting the highest photocatalytic activity and recyclability under ultraviolet (UV) light irradiation. It can be attributed to the double effects of the oxygen vacancy (OV) defect produced by doped ion modification and more active site of the hollow structure. The results show that Fe−TiO 2 composites can be used as effective photocatalysts to mineralize toxic dye molecules from wastewater.

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Section: Resultsmentioning

confidence: 99%

Section: Optical Propertiesmentioning

confidence: 99%

Hollow Fe³⁺-Doped Anatase Titanium Dioxide Nanosphere for Photocatalytic Degradation of Organic Dyes

Hu,

Yang,

Wang

et al. 2023

ACS Appl. Nano Mater.

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“…In fact, a thinner intermediary layer which was between Ag and photocatalyst could also increase the needed wavelength for the resonance effect to reach higher values in composite photocatalysts consisting of Ag . When Ag was coupled with a range of basic photocatalyst materials including TiO 2 , − SnO 2 , − or ZnO, − substantial photocatalytic improvements under visible irradiation or UV was documented. Simagina et al employed Ag-adjusted TiO 2 -based materials for hydrothermolysis and photocatalytic hydrolysis of ammonia borane (NH 3 BH 3 ).…”

Section: Metal-based Photocatalysts For Hydrogen Productionmentioning

confidence: 99%

Hydrogen Production by Water Splitting with Support of Metal and Carbon-Based Photocatalysts

Hoang

Pandey

Chen

et al. 2023

ACS Sustainable Chem. Eng.

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Hydrogen energy is environmental-friendly and considered an attractive alternative to fossil fuels. Among the feasible technologies for hydrogen generation, photocatalysis-derived hydrogen from water splitting is considered to be the optimal solution for meeting long-term sustainability and increased energy demands. In this context, various photocatalytic genres are proposed, with metal and carbon-supported photocatalysts demonstrating greater comprehensiveness and potential for addressing solar-driven hydrogen production from water. Several important aspects of the aforementioned photocatalytic genres are reviewed in the present work in an effort to provide pertinent researchers with new horizons for more advanced performance. The review is initiated by introducing the primary principles in photocatalysis, as well as the prerequisites for hydrogen generation from water. The focus then moves to metal-based photocatalysts, where the important features of these materials as photocatalysts are summarized. Related limitations are also discussed, along with the proposed strategies that could potentially mitigate them. Similar systematic summaries are made of knowledge on carbon-based photocatalysts. The review concludes with a discussion of potential future research directions in light of the bottlenecks currently encountered. With the proper research and development, metal-based and carbon-based photocatalysts could produce clean hydrogen from water, thereby fueling global development without causing environmental harm.

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“…Then, titanium dioxide nanotubes were synthesized in one step using the hydrothermal technique. Finally, copper sul de nanoparticles were coated on the TiO 2 nanotubes using a layer-by-layer process and the degradation of two organic dyes (Ferraz et al 2013, Guo et al 2023, Khalil et al 2019, methylene blue, and malachite green (MG), under visible light was characterized. We believe that this is the rst successful report of the synthesis of TNT from an ilmenite source with enhanced pore size, surface area, and photocatalytic properties.…”

Section: Introductionmentioning

confidence: 99%

Synthesis of TiO2 Nanotubes from Ilmenite with CuS nanoparticles as Efficient Visible-Light Photocatalyst

Abbaspour,

Sarvi,

Azimi

2023

Preprint

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Titanium dioxide nanotube (TNT) is one of the most widely used photocatalysts. In this research, TNT was prepared by a facile method using ilmenite (FeTiO3) concentrate as the titanium source. For this purpose, iron was leached out from ilmenite using HCl in assistance with the iron powder as the reducing agent to produce pure TiO2, where consequently, TNT was produced through hydrothermal treatment of the prepared TiO2 in an alkaline solution. CuS quantum dots, using the L-Cysteine as a linker, were coated on the TNT to improve TNTs’ photocatalytic properties. Characterization was done using XRD, SEM, FESEM, HRTEM, FT-IR, nitrogen sorption, and band gap measurement. The results revealed the formation of TNT with a star-shaped macrostructure as well as, a good dispersion of uniform CuS quantum dots with an average diameter of a few nanometers on the TiO2 structure. A dye adsorption kinetics study of the TNT and CuS-dopped TNT showed that TNT carries a higher adsorption capacity compared to the CuS-dopped TNT, developed due to its higher surface area and pore volume. Next, the photocatalytic performance (under visible light) of the prepared composite was studied over the methylene blue and malachite green dyes, after the determination of the dye adsorption equilibrium point (where the adsorption stops). TNT showed almost no dye degradation while the prepared composite degraded almost 95% of the dyes as the result of the reduced band gap from 3.21 to 2.67 eV. In this study, for the first time, the TNT was prepared using a mineral source, ilmenite, enhanced in photocatalytic properties, and presented a successful application.

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Fast monitoring of organic dye degradation coupled with a colorimetric approach in a Ag-modified TiO2 nanotube photocatalytic system

Cited by 6 publications

References 40 publications

Hollow Fe³⁺-Doped Anatase Titanium Dioxide Nanosphere for Photocatalytic Degradation of Organic Dyes

Hollow Fe³⁺-Doped Anatase Titanium Dioxide Nanosphere for Photocatalytic Degradation of Organic Dyes

Hydrogen Production by Water Splitting with Support of Metal and Carbon-Based Photocatalysts

Synthesis of TiO2 Nanotubes from Ilmenite with CuS nanoparticles as Efficient Visible-Light Photocatalyst

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Fast monitoring of organic dye degradation coupled with a colorimetric approach in a Ag-modified TiO2 nanotube photocatalytic system

Cited by 6 publications

References 40 publications

Hollow Fe3+-Doped Anatase Titanium Dioxide Nanosphere for Photocatalytic Degradation of Organic Dyes

Hollow Fe3+-Doped Anatase Titanium Dioxide Nanosphere for Photocatalytic Degradation of Organic Dyes

Hydrogen Production by Water Splitting with Support of Metal and Carbon-Based Photocatalysts

Synthesis of TiO2 Nanotubes from Ilmenite with CuS nanoparticles as Efficient Visible-Light Photocatalyst

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Hollow Fe³⁺-Doped Anatase Titanium Dioxide Nanosphere for Photocatalytic Degradation of Organic Dyes

Hollow Fe³⁺-Doped Anatase Titanium Dioxide Nanosphere for Photocatalytic Degradation of Organic Dyes