Current perspectives of anodized TiO<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline" id="d1e1461" altimg="si3.svg"><mml:msub><mml:mrow/><mml:mrow><mml:mi mathvariant="bold">2</mml:mi></mml:mrow></mml:msub></mml:math> nanotubes towards photodegradation of formaldehyde: A short review

Sahrin, Nurul Tasnim; Nawaz, Rab; Kait, Chong Fai; Lee, Siew Ling; Wirzal, Mohd Dzul Hakim

doi:10.1016/j.eti.2021.101418

Cited by 20 publications

(4 citation statements)

References 182 publications

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“…Several research centers and groups have ongoing research for decades in synthesizing nanomaterials that can absorb photons, leading to the excitation of electrons for diverse applications [8,9]. Further, the construction of heterojunctions between composite semiconductors with staggered band alignment has become common and considerable in controlling the photoinduced charge migration across the interface, where the electric potential provides the driving force for the controllable charge migration [2,5].…”

Section: Introductionmentioning

confidence: 99%

Characterization and Growth of TiO2/ZnO on PTFE Substrates at Different Volumetric Ratios Using Chemical Bath Deposition

et al. 2023

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Developing non-toxic, semiconductor-doped heterojunction materials for optoelectronic applications on the surface of a flexible substrate is a viable strategy for meeting the world’s energy needs without introducing any environmental issues. In this paper, Ti:TiO2/ZnO nanocomposites were prepared by heat treatment and utilized as an active layer in UV photodetectors. First, a ZnO seed layer was deposited by radio frequency (RF) sputtering on polytetrafluoroethylene (PTFE) substrates. Then, TiO2/ZnO thin films (TFs) were successfully grown by combining volumetric mixtures of TiO2 and ZnO at the ratios of 1:7, 1:3, 3:5, and 1:1 via the chemical bath deposition (CBD) method. The morphological, elemental, and topographical analyses of the grown TFs were investigated through SESEM, EDX, and AFM spectroscopy, respectively. XRD patterns illustrated the presence of the unified (002) peak of the Ti/ZnO hexagonal wurtzite structure in all prepared samples, with intensities indicating a very strong preferential crystallinity with increasing TiO2 ratios. Enhanced diffuse reflectance curves were obtained by UV–Vis spectroscopy, with allowed indirect energy bandgaps ranging from 3.17 eV to 3.23 eV. FTIR characterization revealed wider phonon vibration ranges indicating the presence of Ti–O and Zn–O bonds. Metal–semiconductor–metal (MSM) UV photodetectors were fabricated by thermally evaporating Ag electrodes on the grown nanocomposites. The volumetric ratio of TiO2/ZnO impacted the photodetector performance, where the responsivity, photosensitivity, gain, detectivity, rise time, and decay time of 0.495 AW−1, 247.14%, 3.47, 3.68 × 108 jones, 0.63 s, and 0.99 s, respectively, were recorded at a ratio of 1:1 (TiO2:ZnO). Based on the results, the heterostructure nanocomposites grown on PTFE substrates are believed to be highly promising TF for flexible electronics.

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Section: Introductionmentioning

confidence: 99%

Characterization and Growth of TiO2/ZnO on PTFE Substrates at Different Volumetric Ratios Using Chemical Bath Deposition

et al. 2023

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“…Formaldehyde and phenols in aqueous solutions are of concern regarding the environment and ecosystems, and MOF-based materials as photocatalysts have been reported as promising techniques for addressing these issues. 101,229–232 For instance, a pristine MOF MIL-100(Fe) constructed from Fe(NO 3 ) 3 ·9H 2 O and H 3 BTC in the presence of H 2 O 2 was reported to show the photodegradation of formaldehyde (700 mg L −1 , 93%) within 2 h under visible light irradiation. 230 The initial concentration of formaldehyde was heavily related to the photodegradation efficiency of MIL-100(Fe) with a proposed mechanism involving ˙OH to convert formaldehyde into formate acid and then to CO 2 and H 2 O via holes.…”

Section: Photocatalysis Based On Mofsmentioning

confidence: 99%

Photoelectroactive metal–organic frameworks

Cong

2023

J. Mater. Chem. A

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“…In detail, a concentration of 60 ppm of methylene blue and MG dye solution (100 mL) was prepared and 25 mg of adsorbent (TNT and TNT with quantum dots) were used for absorption. The concentration of the remaining dyes in the solution was measured at intervals of 5,10,20,30,40,60,120,180,240,360,480, 600, and 720 minutes using a spectrophotometer. After analyzing the equilibrium of adsorption, the photocatalytic degradation tests were done under visible light.…”

Section: Kinetics Of Adsorption and Photocatalytic Degradation Of Org...mentioning

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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Current perspectives of anodized TiO2 nanotubes towards photodegradation of formaldehyde: A short review

Cited by 20 publications

References 182 publications

Characterization and Growth of TiO2/ZnO on PTFE Substrates at Different Volumetric Ratios Using Chemical Bath Deposition

Characterization and Growth of TiO2/ZnO on PTFE Substrates at Different Volumetric Ratios Using Chemical Bath Deposition

Photoelectroactive metal–organic frameworks

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

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