Controllable synthesis of TiO2 nanoparticles and their photocatalytic activity in dye degradation

Sathiyan, Krishnamoorthy; Bar‐Ziv, Ronen; Mendelson, Orit; Zidki, Tomer

doi:10.1016/j.materresbull.2020.110842

Cited by 74 publications

(26 citation statements)

References 40 publications

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“…Considering the hazardous nature of MB and CR dyes, there are various reports in the literature on the degradation of these dyes using ZnO nanostructures in aqueous media. 46–63 Since the photocatalytic degradation of these dyes occurs predominantly on the surface of the photocatalyst, studies on the adsorption of the dyes from aqueous solution onto ZnO particles are relevant and important. The equilibrium concentration of the dye ( C eq ) in contact with the catalyst, instead of that of the feed dye solution, represents the true dye concentration in solution at the start of irradiation.…”

Section: Resultsmentioning

confidence: 99%

Effect of calcination temperature on the morphology and catalytic properties of ZnO nanostructures fabricated from a chiral precursor for photodegradation of both cationic and anionic dyes

et al. 2022

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Section: Resultsmentioning

confidence: 99%

Effect of calcination temperature on the morphology and catalytic properties of ZnO nanostructures fabricated from a chiral precursor for photodegradation of both cationic and anionic dyes

et al. 2022

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“…After 60 min, the rate reached its optimum removal efficiency, 94.4%, and a linear relationship between degradation of MB dye and increase in contact time was observed. This is because prolonging irradiation time allows light to fall on the catalyst surfaces and induce formation of photon excited species and enhances the photocatalytic activities [ 58 ].…”

Section: Resultsmentioning

confidence: 99%

Citrus sinensis and Musa acuminata Peel Waste Extract Mediated Synthesis of TiO₂/rGO Nanocomposites for Photocatalytic Degradation of Methylene Blue under Visible Light Irradiation

Olana

Sabir

Bekele

et al. 2022

Bioinorganic Chemistry and Applications

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Water pollution caused by various natural and artificial sources such as expansion of industrialization, rapid increment in population size, the threat of climate change, and development in urbanization takes a serious attention. Due to this fact, various protocols and techniques were adopted for the treatment of such polluted water. In the present findings, TiO2 nanoparticles (NPs) and TiO2/rGO nanocomposites (NCs) were synthesized using titanium tetra butoxide in the presence of Citrus sinensis (CS) and Musa acuminata (MA) peel waste extract as a capping, reducing, and stabilizing agent. The synthesized NPs and NCs were characterized using thermogravimetric-differential thermal analysis (TGA/DTA), X-ray diffraction (XRD), scanning electron microscope (SEM), high resolution transmission electron microscopy (HR-TEM), selected area electron diffraction (SAED) pattern, ultraviolet diffuse reflectance spectroscopy (UV-DRS), and Fourier transform infrared (FTIR) spectroscopy. The synthesized NPs and NCs were investigated as green alternative photocatalyst for the degradation of methylene blue (MB) dye under visible light irradiation. Thermal analysis results confirmed that the green synthesized TiO2 NPs were found to be too stable above 550°C. XRD analysis result showed that the average crystalline size of CS and MA mediated synthesized TiO2 NPs with various volume ratios was in the range of 7.3–27.3 nm and 13.4–22.4 nm, respectively. The average crystalline size of CS and MA peel extract template synthesized TiO2/rGO NCs was found to be in the range of 7.5–15.3 and 11.2–12.5 nm, respectively. The band gap energy was calculated to be in the range of 3.17–3.29 eV and 3.10–3.38 eV for the CS and MA mediated synthesized TiO2 NPs, respectively. E g of CS and MA peel extract template formed TiO2/rGO NCs was found to be in the range of 2.85–3.11 eV and 3.07–3.11 eV, respectively. SEM analysis proved that the various synthesized TiO2 NPs and TiO2/rGO NCs were spherical in shape and the absence of any other foreign materials confirmed the purity of the corresponding nanocatalysts. In addition, TEM, HRTEM, and SAED analysis confirmed that the structures of the synthesized nanocatalysts were spherical in shape and the catalysts were too crystalline and the result was found to fit with the XRD result. Among the synthesized various volume ratios of TiO2 nanocatalysts, high percentage of degradation (62% and 58.2%) was achieved using TiO2-2c and TiO2-2 m, respectively. Moreover, 94.28% and 94.25% of MB degradation were achieved in the presence of TiO2/rGO-1.5c and TiO2/rGO-1.5c nanocomposite photocatalysts, respectively.

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“…Also, from the Scherrer Calculator, [48] the size of anatase crystallite was 6.2 nm. [49] The (111) and (200) reflection planes of gold have sharp peaks at 2θ of 38.1°and 44.3°, respectively.…”

Section: Materials Characterizationmentioning

confidence: 99%

“…The colloidal TiO 2 suspension was prepared by controlled hydrolysis of titanium tetrachloride (TiCl 4 ), followed by Rabani et al [33] We used a homemade setup for producing the colloidal TiO 2 suspension in a more controlled and reproducible manner. [49] An ice-cold TiCl 4 liquid is slowly introduced into a 0.1 M HCl aqueous solution along with a stream of dry Ar and vigorous stirring. Note that the TiCl 4 should not contact any moisture before getting to the solution; therefore, the dry-addition apparatus was used.…”

Section: Preparation Of Tio 2 -(M 0 -Nps)mentioning

confidence: 99%

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The Role of Common Alcoholic Sacrificial Agents in Photocatalysis: Is It Always Trivial?

Sathiyan

Bar‐Ziv²,

Marks

et al. 2021

Chemistry A European J

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Photocatalytic hydrogen production is proposed as a sustainable energy source. Simultaneous reduction and oxidation of water is a complex multistep reaction with high overpotential. Photocatalytic processes involving semiconductors transfer electrons from the valence band to the conduction band. Sacrificial substrates that react with the photochemically formed holes in the valence band are often used to study the mechanism of H 2 production, as they scavenge the holes and hinder charge carrier recombination (electron-hole pairs). Here, we show that the desired sacrificial agent is one forming a radical that is a fairly strong reducing agent, and whose oxidized form is not a good electron acceptor that might suppress the hydrogen evolution reaction (HER). In an acidic medium, methanol was found to fulfill both these requirements better than ethanol and propan-2-ol in the TiO 2 -(M 0 -NPs) (M = Au or Pt) system, whereas in an alkaline medium, the alcohols exhibit a reverse order of activity. Moreover, we report that CH 2 (OH) 2 is by far the most efficient sacrificial agent in a nontrivial mechanism in acidic media. Our study provides general guidelines for choosing an appropriate sacrificial substrate and helps to explain the variance in the performance of alcohol scavenger-based photocatalytic systems.

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Controllable synthesis of TiO2 nanoparticles and their photocatalytic activity in dye degradation

Cited by 74 publications

References 40 publications

Effect of calcination temperature on the morphology and catalytic properties of ZnO nanostructures fabricated from a chiral precursor for photodegradation of both cationic and anionic dyes

Effect of calcination temperature on the morphology and catalytic properties of ZnO nanostructures fabricated from a chiral precursor for photodegradation of both cationic and anionic dyes

Citrus sinensis and Musa acuminata Peel Waste Extract Mediated Synthesis of TiO₂/rGO Nanocomposites for Photocatalytic Degradation of Methylene Blue under Visible Light Irradiation

The Role of Common Alcoholic Sacrificial Agents in Photocatalysis: Is It Always Trivial?

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Controllable synthesis of TiO2 nanoparticles and their photocatalytic activity in dye degradation

Cited by 74 publications

References 40 publications

Effect of calcination temperature on the morphology and catalytic properties of ZnO nanostructures fabricated from a chiral precursor for photodegradation of both cationic and anionic dyes

Effect of calcination temperature on the morphology and catalytic properties of ZnO nanostructures fabricated from a chiral precursor for photodegradation of both cationic and anionic dyes

Citrus sinensis and Musa acuminata Peel Waste Extract Mediated Synthesis of TiO2/rGO Nanocomposites for Photocatalytic Degradation of Methylene Blue under Visible Light Irradiation

The Role of Common Alcoholic Sacrificial Agents in Photocatalysis: Is It Always Trivial?

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Citrus sinensis and Musa acuminata Peel Waste Extract Mediated Synthesis of TiO₂/rGO Nanocomposites for Photocatalytic Degradation of Methylene Blue under Visible Light Irradiation