Synergistic effects of high-frequency ultrasound on photocatalytic degradation of aldehydes and their intermediates using TiO2 suspension in water

Sekiguchi, Kazuhiko; Sasaki, Chie; Sakamoto, Kazuhiko

doi:10.1016/j.ultsonch.2010.04.008

Cited by 39 publications

(17 citation statements)

References 36 publications

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“…However, the result of the present work depicts higher degradation when compared to these reports [17][18][19][20][21][22][23][24]. The difference in degradation time depends on the preparation methods, size and morphology of the samples [6].…”

Section: Photocatalytic Degradation Of Mo and Mbcontrasting

confidence: 56%

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Synthesis and characterization of TiO2 quantum dots for photocatalytic application

Gnanasekaran¹,

Hemamalini²,

Ravichandran

2015

Journal of Saudi Chemical Society

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In the present study, TiO 2 quantum dots (QDs) were effectively synthesized by the solgel method and it was characterized by several techniques. The structure of the TiO 2 QDs, before and after calcination, was analyzed by the powder X-ray diffraction technique. The XRD results indicate that after calcination, TiO 2 QDs have pure anatase phase with tetragonal structure without any other phases and impurities. The morphology and size of the TiO 2 QDs were determined from FE-SEM and TEM analysis. The optical band gap of TiO 2 QDs was estimated using KubelkaMunk function from diffuse reflectance spectroscopy. The photocatalytic activity and recycling ability of the TiO 2 QDs have been investigated. The TiO 2 QDs were used to degrade the model dyes such as methyl orange and methylene blue under UV light irradiation and their results have been discussed. A mechanism is proposed and discussed accordingly in detail. ª 2015 The Authors. Production and hosting by Elsevier B.V. on behalf of King Saud University. This is an open access article under the CC BY-NC-ND license (http://creativecommons.org/licenses/by-nc-nd/4.0/).

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Section: Photocatalytic Degradation Of Mo and Mbcontrasting

confidence: 56%

“…Few researchers synthesized TiO 2 for photo catalytic applications [17][18][19][20][21][22][23][24]. However, the result of the present work depicts higher degradation when compared to these reports [17][18][19][20][21][22][23][24].…”

Section: Photocatalytic Degradation Of Mo and Mbcontrasting

confidence: 53%

Synthesis and characterization of TiO2 quantum dots for photocatalytic application

Gnanasekaran¹,

Hemamalini²,

Ravichandran

2015

Journal of Saudi Chemical Society

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“…Q t , Q Qu and D increase first and then decrease with increase in n AA / n NVP , while Q Ge shows the opposite variation. According to our experimental results, the self‐assembly effect of the two functional monomers was more effective due to the synergistic effect of the monomers 33, 34. The small amount of AA naturally meant that the self‐assembly synergistic effect was not sufficient, and the self‐assembly between Qu and the functional monomers was not complete; the stability of the self‐assembly groups was low, which resulted in the existence of large FAL.…”

Section: Resultsmentioning

confidence: 84%

Synthesis and optimization of molecularly imprinted polymers for quercetin

Chen

et al. 2012

Polymer International

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Molecularly imprinted polymers (MIPs) were synthesized through solution polymerization using quercetin as the template molecule, N-vinylpyrrolidone and acrylic acid as functional monomers, N,N -methylenebiacrylamide as crosslinker and the redox system L-ascorbic acid and hydrogen peroxide as initiator in the porogen of ethanol and water. During the optimization process an interference compound, genistein (5,7,4 -trihydroxy isoflavone), which possesses the same skeleton and functional groups as quercetin, was adopted to optimize the preparation conditions, and the separation degree of the MIP to quercetin and genistein was chosen to optimize each factor. The synthesized MIP under optimal conditions showed a specific recognition of quercetin from a mixture of quercetin and genistein. Thereafter, the structure of the MIP was comparatively characterized by Fourier transform infrared spectroscopy, scanning electron microscopy and Brunauer-Emmett-Teller analysis using nonimprinted molecular polymers as control. In addition, the kinetics of the adsorption process were also studied, and Scatchard analysis revealed that heterogeneous binding sites were formed in the polymers.

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“…(5)- (7)), and contributed to the mineralization of degradation products formed by toluene decomposition. However, there was little generation of OH radicals under dry conditions, and they were competing reactions between toluene and the degradation products (Einaga and Futamura, 2004;Sekiguchi et al, 2011). Under wet conditions (70% RH), the mineralization ratio increased to 50-60%, and it was much higher under UV 254 irradiation.…”

Section: Toluene Removal Under Various Conditionsmentioning

confidence: 99%

Ozone Catalytic Oxidation of Gaseous Toluene over MnO2-Based Ozone Decomposition Catalysts Immobilized on a Nonwoven Fabric

Sekiguchi

Kurita

Sankoda

et al. 2017

Aerosol Air Qual. Res.

Self Cite

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Degradation of toluene gas by ozone catalytic oxidation (OZCO) by using a MnO 2 -based ozone decomposition catalyst (ODC) was investigated to clarify the reactive site of ODC material with O 3 . An optimum structure for the ODC to remove O 3 and toluene were proposed. For honeycomb ODC, toluene degradation by OZCO occurred only around the entrance of the honeycomb ODC, and we expected that a thinner ODC would increase the toluene degradation efficiency. A nonwoven fabric on which ODC was immobilized was developed to decompose O 3 and volatile organic compounds simultaneously. The toluene degradation ratio and the mineralization of toluene to CO 2 were determined to evaluate the performance of the fabric. Furthermore, the effects of relative humidity and O 3 concentration on the decomposition and mineralization ratios were also investigated with or without 254 nm UV irradiation (UV 254 ). The fabric decomposed and mineralized toluene to CO 2 , even at low O 3 concentrations. Although high humidity reduced the degradation ratio of toluene, UV 254 irradiation improved the recovery of the degradation ratio and increased the mineralization ratio.

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Synergistic effects of high-frequency ultrasound on photocatalytic degradation of aldehydes and their intermediates using TiO2 suspension in water

Cited by 39 publications

References 36 publications

Synthesis and characterization of TiO2 quantum dots for photocatalytic application

Synthesis and characterization of TiO2 quantum dots for photocatalytic application

Synthesis and optimization of molecularly imprinted polymers for quercetin

Ozone Catalytic Oxidation of Gaseous Toluene over MnO2-Based Ozone Decomposition Catalysts Immobilized on a Nonwoven Fabric

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