Black TiO2-graphitic carbon nanocomposite from a single source precursor and its interaction with colored and colorless contaminants under visible radiation

Kushwaha, Shreya; Nagarajan, Rajamani

doi:10.1016/j.materresbull.2020.110983

Cited by 5 publications

(4 citation statements)

References 45 publications

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“…The synthesis details of the Ti–EDTA complex are described elsewhere . A 1 g portion of complex was homogenized with approximately 25 mL of propylene glycol (Merck, ≥99%).…”

Section: Methodsmentioning

confidence: 99%

“…The synthesis details of the Ti−EDTA complex are described elsewhere. 49 A 1 g portion of complex was homogenized with approximately 25 mL of propylene glycol (Merck, ≥99%). The resultant contents were transferred to a hydrothermal vessel of 40 mL capacity, and the solvothermal treatment was provided at 200 °C for 24 h. The obtained product was centrifuged and washed repeatedly with dichloromethane (Fisher Scientific, 99%) to remove any unreacted propylene glycol and was dried at 150 °C for 3 h.…”

Section: ■ Experimental Sectionmentioning

confidence: 99%

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Anatase Nanocrystals Covalently Functionalized with EDTA-diol: Interaction with Aromatic Sulfur

Kushwaha

Nagarajan

2021

Langmuir

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The current study addresses the generation of surface-modified nanograined anatase (5 nm) by a single-step in situ process. The EDTA-diol (ester) functionality existing on the surface of anatase nanoparticles was proved with the help of a battery of physicochemical techniques, including FTIR, XPS, and NMR spectral measurements. The sample showed excellent dispersity in ethanol. The anatase lattice showed disorder and had oxygen vacancies. From the XPS analysis, the existence of 14% of Ti 3+ was established. The functionalized sample remained thermally stable up to 250 °C, beyond which it transformed into a graphite−titania nanocomposite. The interfacial ligand (ester) to metal (Ti) charge transfer (LMCT) transitions were present in the UV−visible spectrum of the sample and indicated the functionalization to be covalent. Unsaturated OH-groups on the surface yielded a ζpotential value of −39.8 mV. The covalently functionalized nanotitania was exploited in the adsorptive desulfurization of thiophene, an aromatic sulfur model compound. The consequences of surface adsorption of thiophene were analyzed with the help of UV− visible, FTIR, and 1 H and 13 C NMR spectra and EDS and XPS measurements. The adsorption data, derived from the batch process, were fitted successfully to pseudo-second-order kinetics and the Temkin model. The adsorption capacity of covalently functionalized titania was compared with several other high surface area adsorbents containing thiophilic metal ions.

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“…The synthesis details of the Ti–EDTA complex are described elsewhere . A 1 g portion of complex was homogenized with approximately 25 mL of propylene glycol (Merck, ≥99%).…”

Section: Methodsmentioning

confidence: 99%

Section: ■ Experimental Sectionmentioning

confidence: 99%

Anatase Nanocrystals Covalently Functionalized with EDTA-diol: Interaction with Aromatic Sulfur

Kushwaha

Nagarajan

2021

Langmuir

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“…Xiao et al [77] reported the formation of oxygen vacancies in TiO2 during the process of calcining TiO2 in Ar or N2 atmospheres. Kushwaha et al [78] prepared a black oxygen-deficient TiO2-graphite nanocomposite by Apart from H 2 , some other gases have been also used as reductants. For example, NH 3 is also often used to reduce TiO 2 .…”

Section: Reductive Treatmentmentioning

confidence: 99%

“…Xiao et al [77] reported the formation of oxygen vacancies in TiO 2 during the process of calcining TiO 2 in Ar or N 2 atmospheres. Kushwaha et al [78] prepared a black oxygen-deficient TiO 2 -graphite nanocomposite by calcining Ti-EDTA complex under hypoxic conditions. Singh et al [36] investigated the effect of thermal treatment on TiO 2 thin films under an oxygen anoxic environment, reporting a reduction in the band gap of 0.36 eV.…”

Section: Reductive Treatmentmentioning

confidence: 99%

A Review on Oxygen-deficient Titanium Oxide for Photocatalytic Hydrogen Production

Chen¹,

Fu²,

Peng³

2023

Preprint

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Photocatalytic technology based on specific band structure of semiconductors offers a promising way to solve the urgent energy and environmental issues in modern society. In particular, hydrogen production from water splitting over semiconductor photocatalysts attracts great attention owing to the clean source and application of energy, which highly depends on the performance of photocatalysts. Among the various photocatalysts, TiO2 has been intensively investigated and used extensively due to its outstanding photocatalytic activity, high chemical stability, non-toxicity and low cost. However, pure TiO2 has a wide band gap of approximately 3.2 eV, which limits its photocatalytic activity for water splitting to generate hydrogen only under ultraviolet light, excluding most of the inexhaustible sunlight for human beings. Fortunately, the band gap of semiconductors can be manipulated, in which introducing oxygen defects is one of the most effective measures to narrow the band gap of titanium oxides. This review starts out by the fundamentals of photocatalytic water splitting for hydrogen production over TiO2, discusses the latest progress in this field, and summarizes the various methods and strategies to induce oxygen defects in TiO2 crystals. Then, the next section outlines the modification approaches of oxygen-deficient titanium oxide (TiO2-δ) to further improve its photocatalytic performance. Finally, a brief summary and outlook of the researches on TiO2-δ photocatalysts for water splitting to produce hydrogen were presented.

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Spray pyrolysis synthesis and UV-driven photocatalytic activity of mesoporous Al2O3@TiO2 microspheres

2022

Environ Sci Pollut Res

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Black TiO2-graphitic carbon nanocomposite from a single source precursor and its interaction with colored and colorless contaminants under visible radiation

Cited by 5 publications

References 45 publications

Anatase Nanocrystals Covalently Functionalized with EDTA-diol: Interaction with Aromatic Sulfur

Anatase Nanocrystals Covalently Functionalized with EDTA-diol: Interaction with Aromatic Sulfur

A Review on Oxygen-deficient Titanium Oxide for Photocatalytic Hydrogen Production

Spray pyrolysis synthesis and UV-driven photocatalytic activity of mesoporous Al2O3@TiO2 microspheres

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