Kinetics study for photodegradation of methylene blue dye by titanium dioxide powder prepared by selective leaching method

Ono, Yoshio; Rachi, Takeshi; Okuda, Tetsuya; Yokouchi, Masahiro; Kamimoto, Yoshihito; Nakajima, Akira; Okada, Kiyoshi

doi:10.1016/j.jpcs.2011.10.012

Cited by 12 publications

(6 citation statements)

References 29 publications

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“…This correlates well with the dispersive surface energy, where recent reports in the literature have shown that larger surface energy values are due to under-coordinated Ti sites on the surface of the particles (40). The photo-catalysts generate electron hole pairs when excited by UV-Vis radiation, and these eventually form OH or oxygen radicals on the surface of the particles (41). The presence of a greater amount of Ti 3+ will produce more oxygen radicals, an observation that was recently reported by Zhang et al (42).…”

Section: Photocatalytic Activities Of the As-prepared Materials Undersupporting

confidence: 82%

“…The presence of a greater amount of Ti 3+ will produce more oxygen radicals, an observation that was recently reported by Zhang et al (42). The commercial catalyst performs better in this system, since it favors production of OH radicals, which have been shown to be the likely and most effective pathway for degradation of methylene blue (41). Thus the synthesized catalysts would function in system where oxygen radicals have been shown to be advantageous, such as methylene orange (42), or with a system that can provide a more conducive source of oxygen radicals; specifically, ozone.…”

Section: Photocatalytic Activities Of the As-prepared Materials Undermentioning

confidence: 99%

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Synthesis, Characterization, and Application of TiO2 Nanoparticles – Effect of pH Adjusted Solvent

Oseghe

Ndungu

Jonnalagadda

2015

Journal of Advanced Oxidation Technologies

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Abstract:TiO 2 nanoparticles were synthesized via the sol-gel method by varying the pH of the solvent used in the synthesis. The aim of the pH variation was to study its effect on the surface energy amongst other characteristics, and photocatalytic properties. The sol-gel method was adopted in the synthesis of TiO 2 nanoparticles and calcined in air at 400 °C at 2 °C/min. The as-prepared materials were characterized by X-ray powder diffraction (XRD), scanning electron microscopy (SEM), high resolution transmission electron microscopy (HRTEM), N 2 sorption, Raman spectroscopy, fluorescence spectrometry, and electron spin resonance spectroscopy (ESR), surface energy analyser (SEA), vibrating sample magnetometer (VSM). Photocatalytic properties of the materials were evaluated by monitoring the decoloration of model dye, methylene blue (MB) under natural sunlight conditions. The as-prepared materials existed in the anatase phase with polycrystalline and paramagnetic properties. The amount of surface defects of the as-prepared materials correlated well with the crystal size. The highest dispersive surface energy, 89.17 mJ/m 2 exhibited by TB400, and the least dispersive energy of 49.67 mJ/m 2 by TN400 are attributed to their microporosity. The acid -base numbers show that the materials are amphoteric with more of the basic sites. The values of the acidity-basicity ratio confirm the effect of pH in the synthesis of TiO 2 . The photocatalytic activities of the as-prepared materials were in the order of TB400 > TN400 > TA400, attributed to their characteristic crystal sizes, and surface defects.

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Section: Photocatalytic Activities Of the As-prepared Materials Undersupporting

confidence: 82%

Section: Photocatalytic Activities Of the As-prepared Materials Undermentioning

confidence: 99%

Synthesis, Characterization, and Application of TiO2 Nanoparticles – Effect of pH Adjusted Solvent

Oseghe

Ndungu

Jonnalagadda

2015

Journal of Advanced Oxidation Technologies

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“…This is because the surface area of La:Co:TiO 2 nanocomposites are greater than TiO 2 . Hence La:Co:TiO 2 nanocomposites is absorbing the more photon on its surface than TiO 2 [54]. Hence the adsorption of Tartaric Acid molecule on the surface of photocatalyst increased and photodegradation of Acid become increase.…”

Section: Effect Of Photocatalystmentioning

confidence: 99%

Synthesis of La:Co:TiO<sub>2</sub> Nanocomposite and Photocatalytic Degradation of Tartaric Acid in Water at Various Parameters

Kumar¹

2017

NANO

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Abstract:In this study, nanocomposites of La:Co:TiO 2 was prepared by the co-precipitation method. The alcoholic route of synthesis was adopted here which was gives greenish homogeneous powder of La:Co:TiO 2 . The material was found in the nanodiamension by the SEM analysis. The rutile and anatase both phases were present in XRD analysis of the synthesized materials. The particle size was found 24 and 82 nm in case of La:Co:TiO 2 and pure Titania respectively. The surface area of Titania and La:Co:TiO 2 nanocomposites were found 6.4 and 43.2 m 2 /g. The band gap energy of Titania and La:Co:TiO 2 nanocomposites were found 3.2 eV and 3.0 eV respectively. The photodegradation of Tartaric Acid was investigate at different parameters such as temperature, concentration, pH of reaction mixture, dose of photocatalyst and time of illumination of UVVisible light. The photodegradation of Tartaric Acid occurs 60-80% in presence of Cobalt lanthanum modified Titania and in presence of neat Titania only 20-40% degradation was observed. It is found that photodegradation of Tartaric Acid follow the first order mechanism and its rate constant is become doubled when temperature is rise by 10°C.

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“…The presence of Fe 2 O 3 and Fe 3 O 4 in SUS3161L nanoballs contribute to its photocatalytic effect. [30][31][32][33][34][35][36][37][38][39] The bandgaps of both Fe 2 O 3 and Fe 3 O 4 are 2.2 eV. Their low bandgap allows them to be photoexcited by UV light and potentially by visible light as well.…”

Section: Physical Characteristics Of Nanoballsmentioning

confidence: 99%

Formation of Stainless Steel Nanoballs via Submerged Glow-discharge Plasma and their Microstructural Analysis with Evaluation of Photocatalytic Activity

et al. 2018

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Stainless steel has shown potential as a catalytic material in bulk form. However, it only becomes active in an aqueous acidic environment and elevated temperatures. This study aims to produce stainless steel nanoparticles that have high photocatalytic activity in a neutral medium and at room temperature and to elucidate the photocatalytic activity mechanism of the nanoparticles. Spherical, photocatalytic nanoparticles called "nanoballs" were synthesized by the submerged glow-discharge method. Stainless steel SUS316L grade wire was used as the cathode, platinum mesh was used as the anode while the electrolyte was potassium carbonate. The nanoballs were obtained after centrifuging and washing with water. The physical characteristics of the photocatalytic nanoballs were analysed by scanning electron microscopy, high-resolution transmission electron microscopy, energy-dispersive X-ray spectroscopy and X-ray diffraction. The nanoballs were mixed with methylene blue and irradiated with ultraviolet light for the evaluation of photocatalytic reaction. The photodecomposition samples were determined using UV-vis spectrometry. The by-products of the photodecomposition were evaluated using mass spectrometry. The results show that stainless steel nanoballs have photocatalytic activity when irridiated with ultraviolet light at room temperature. Submerged glow-discharge plasma method can synthesize nanoparticles rapidly using only metal wires as the electrode.

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Kinetics study for photodegradation of methylene blue dye by titanium dioxide powder prepared by selective leaching method

Cited by 12 publications

References 29 publications

Synthesis, Characterization, and Application of TiO2 Nanoparticles – Effect of pH Adjusted Solvent

Synthesis, Characterization, and Application of TiO2 Nanoparticles – Effect of pH Adjusted Solvent

Synthesis of La:Co:TiO<sub>2</sub> Nanocomposite and Photocatalytic Degradation of Tartaric Acid in Water at Various Parameters

Formation of Stainless Steel Nanoballs via Submerged Glow-discharge Plasma and their Microstructural Analysis with Evaluation of Photocatalytic Activity

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Kinetics study for photodegradation of methylene blue dye by titanium dioxide powder prepared by selective leaching method

Cited by 12 publications

References 29 publications

Synthesis, Characterization, and Application of TiO2 Nanoparticles – Effect of pH Adjusted Solvent

Synthesis, Characterization, and Application of TiO2 Nanoparticles – Effect of pH Adjusted Solvent

Synthesis of La:Co:TiO&lt;sub&gt;2&lt;/sub&gt; Nanocomposite and Photocatalytic Degradation of Tartaric Acid in Water at Various Parameters

Formation of Stainless Steel Nanoballs via Submerged Glow-discharge Plasma and their Microstructural Analysis with Evaluation of Photocatalytic Activity

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Synthesis of La:Co:TiO<sub>2</sub> Nanocomposite and Photocatalytic Degradation of Tartaric Acid in Water at Various Parameters