Formation of self-assembled spherical-flower like nanostructures of cobalt doped anatase TiO 2 and its optical band-gap

Alamgir,; Khan, Wasi; Ahmad, Shabbir; Naqvi, Andleeb Z.

doi:10.1016/j.matlet.2014.06.121

Cited by 10 publications

(4 citation statements)

References 16 publications

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“…Room temperature Raman scattering spectra of calcined and plasma-treated CoPt/TiO 2 catalysts are given in Figure . Six Raman bonds at 146 (E g ), 198 (E g ), 394 (B 1g ), 515 (B 2g ), and 630 (E g ) cm –1 corresponding to anatase TiO 2 and a weak broad band at 469 cm –1 (E g ) attributed to rutile TiO 2 are observed under typical Raman active modes . Consistent with XRD results, the Raman data indicated that the TiO 2 support was in the form of anatase phase mixed with a small fraction of rutile phase.…”

Section: Resultssupporting

confidence: 76%

Plasma-Assisted Preparation of Highly Dispersed Cobalt Catalysts for Enhanced Fischer–Tropsch Synthesis Performance

Hong

Wang

et al. 2018

ACS Catal.

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Glow discharge plasma (GDP) was used for the preparation of Co/TiO2 Fischer–Tropsch synthesis (FTS) catalysts promoted by Pt. This technique was compared with conventional thermal calcination for decomposing cobalt precursor. In this study, Pt was added as a reduction promoter in order to improve the reducibility of Co/TiO2 catalysts because the strong interaction between Co and TiO2 is detrimental to the FTS performances. It was found that plasma treatment can effectively decompose the cobalt precursor at a low temperature in a short time (1–4 h). As compared to thermal calcination, the cobalt species prepared by GDP is highly dispersed on TiO2 support. CoPt/TiO2 catalyst with homogeneously and highly dispersed cobalt particles (∼1 nm) was achieved by prolonging plasma treatment from 1 to 4 h. This is difficult to accomplish via conventional calcination method on preparing this loading cobalt catalyst (12 wt %) without the use of extra chemicals and a complicated process. Furthermore, we found that a short time plasma treatment (<3 h) not only increased the amount of active sites but also enhanced their specific reactivity, leading to much higher FT reaction rate.

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Section: Resultssupporting

confidence: 76%

Plasma-Assisted Preparation of Highly Dispersed Cobalt Catalysts for Enhanced Fischer–Tropsch Synthesis Performance

Hong

Wang

et al. 2018

ACS Catal.

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“…2016, 42 (12): 8039-8053. doi:10.1007/s11164-016-2577 -9 expanded the field of application of TiO 2 [8][9][10][11][12]. Recently several methods were investigated for the purpose to obtain TiO 2 in the shape of micro and nanoparticles with different morphologies such as nanotubes [13], nanofibers [14], or spheres [15]. Moreover, pure TiO 2 nanoparticles are difficult to be recycled and rapidly lose their effective surface area during their catalytic applications [16,17].…”

Section: Introductionmentioning

confidence: 99%

Structural and textural features of TiO2/SAPO-34 nanocomposite prepared by the sol–gel method

et al. 2016

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This paper focuses on the synthesis of nanocomposite materials TiO 2 /SAPO-34 using the sol-gel method, which involves preparing a mixture between as-synthesized or calcined SAPO-34 zeolite and TiO 2 gel under hydrothermal crystallization and then calcined at 400 °C for the formation of TiO 2 anatase phase. The structural and textural features of the obtained materials were determined by various physico-chemical techniques such as thermogravimetric analysis (TGA), X-ray diffraction (XRD), scanning electronic microscopy (SEM), Nitrogen sorption at 77 K, energy dispersive X-ray analysis (EDX) and ultravioletvisible (UV-vis). The DRX results showed that calcination at 400 °C of the mixture between calcined SAPO-34 and TiO 2 gel led to the collapse of the original framework of zeolite but forms the anatase TiO 2 in a nano-spherical morphology, but the use of as-synthesized SAPO-34 supports provides a mixture phase between SAPO-34 and TiO 2 anatase after calcination. The photocatalytic properties of SAPO-34/TiO 2 andTiO 2 type materials were tested for the removal of methylene blue (MB) dye. The MB degradation proved to be increasing as a function of contact time, catalyst mass and the initial concentration of MB.

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“…However, for Ti metal, the high melting point of Ti prevents the synthesis of TiO 2 nanostructures via the dry synthesis process. Accordingly, TiO 2 nanostructures have been synthesized using wet chemical process such as sol-gel process, 3) hydrothermal process 4) and solvothermal process. 5) Nevertheless, the synthesis of TiO 2 crystals with a sheet morphology using a wet chemical process has rarely been reported.…”

Section: Introductionmentioning

confidence: 99%

Preparation of Rutile TiO<sub>2</sub> Particles with Stacks of Sheets Using a Thermal Oxidation Process

Lee

2016

Mater. Trans.

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TiO 2 particles with stacked flat sheets are synthesized via thermal oxidation of TiO powder in an oxygen atmosphere. The flat sheets are formed under specific synthesis conditions of 1000°C and 6.5 © 10 4 Pa. The x-ray diffraction pattern demonstrates that the sheets are TiO 2 with a rutile crystallographic structure. The characteristic peaks of the anatase crystal structure of TiO 2 are not detected. From the scanning electron microscopy, the thickness of the sheets is in the range from 80 to 200 nm and the lateral dimensions of the sheets are several tens of µm © several tens of µm, which indicates that the sheets have significant surface area-to-volume ratio when compared with those of other nanostructures. Furthermore, most sheets are aligned parallel to each other.

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Formation of self-assembled spherical-flower like nanostructures of cobalt doped anatase TiO 2 and its optical band-gap

Cited by 10 publications

References 16 publications

Plasma-Assisted Preparation of Highly Dispersed Cobalt Catalysts for Enhanced Fischer–Tropsch Synthesis Performance

Plasma-Assisted Preparation of Highly Dispersed Cobalt Catalysts for Enhanced Fischer–Tropsch Synthesis Performance

Structural and textural features of TiO2/SAPO-34 nanocomposite prepared by the sol–gel method

Preparation of Rutile TiO<sub>2</sub> Particles with Stacks of Sheets Using a Thermal Oxidation Process

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