Photocatalytic Degradation of Nonionic Surfactants with Immobilized TiO2 in an Airlift Reactor

Kimura, Toshiaki; Yoshikawa, Norishige; Matsumura, Nobuhiko; Kawase, Y.

doi:10.1081/lesa-200034072

Cited by 14 publications

(4 citation statements)

References 15 publications

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“…Both the solutions were photo degraded efficiently. The photocatalytic degradation of non-ionic surfactant, Sanonic SS-90 (polyoxyethylene alkyl ether) in water has been investigated by Kimura et al [77] using immobilized TiO 2 photocatalyst. The rate constant of photocatalytic degradation was found to be proportional to TiO 2 surface area and the square root of UV light intensity.…”

Section: Surfactantsmentioning

confidence: 99%

Photocatalytic Degradation of Organic Pollutants: A Review

Ameta¹,

Benjamin²,

Ameta

et al. 2012

MSF

113

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Water pollution is increasing at an ever increasing pace and the whole world is in the cancerous grip of this pollution. Various industries are discharging their untreated effluents into the nearby water resources; thus, adding to the existing water pollution to a great extent. Hence, there is a pressing demand to develop an alternate technology for wastewater treatment and in this context; photocatalysis has emerged as an Advanced Oxidation Process with green chemical approach for such a treatment. This chapter deals with photocatalytic degradation of different kinds of organic pollutants; mainly surfactants, pesticides, dyes, phenols, chloro compounds, nitrogen containing compounds etc. Mechanisms of their degradation have also been discussed with hydroxyl and allied radicals as the main active oxidizing species.

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Section: Surfactantsmentioning

confidence: 99%

Photocatalytic Degradation of Organic Pollutants: A Review

Ameta¹,

Benjamin²,

Ameta

et al. 2012

MSF

113

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“…33 TiO 2 -mediated photodegradation was also used for decomposition of various amino acids, [34][35][36] as well as for surfactant decontamination. [37][38][39][40][41][42][43] The objective of this study is to investigate the TiO 2 -based photocatalytic treatment of 1,5-naphthalenedisulfonate (NDS) in a laboratory-scale reactor in order to contribute to the elucidation of the oxidative degradation mechanism of this surfactant. The changes during the photocatalysis were followed by measuring the pH, the absorption and emission spectra, the sulfate concentration, and the total organic carbon (TOC) content of the mixture irradiated.…”

Section: Introductionmentioning

confidence: 99%

Photocatalytic Degradation of 1,5-Naphthalenedisulfonate on Colloidal Titanium Dioxide

et al. 2008

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Photocatalytic degradation of 1,5-naphthalenedisulfonate (NDS) was investigated by monitoring the absorption and emission spectral changes, chemical oxygen demand, total organic carbon (TOC) content as well as pH and sulfate concentration. Intermediates formed during the irradiation were also detected by liquid chromatographic-mass spectrometric analysis. The results obtained by the applied analytical techniques clearly indicate that the initial step of degradation is oxygenation (hydroxylation) of the starting surfactant resulting in the formation of an 8-hydroxy derivative, although desulfonation and some mineralization, that is, decrease of TOC indicating carbon dioxide generation, also take place at this stage. Further oxygenation and desulfonation lead to the destruction of the diaromatic naphthalene system, then to ring fission, producing diols, aldehydes, and carboxylic acids on the side-chains. A tentative scheme involving possible pathways of degradation is proposed, taking the intermediates detected by mass spectrometry into consideration. On the basis of the results of quantum chemical calculations, the most possible points of attack by HO radical were identified, supplementing the MS results, and elucidating the initial oxidation step in the degradation of NDS and the benzenesulfonate (BS) intermediate. Thus, in the case of NDS para position is favored for hydroxylation, while for BS, formation of the ortho-hydroxy derivative is preferred.

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“…The light intensity at the light source per unit length of a UV lamp for one lamp was 6.0 W(m-lamp length) −1 . [15] The light energy that was supplied to the solution and actually used to degrade polyphenols was not measured. Incidentally the average light intensity over the cross-sectional area of the external irradiation cylindrical column photoreactor can be evaluated using the linear light source model.…”

Section: Methodsmentioning

confidence: 99%

“…Incidentally the average light intensity over the cross-sectional area of the external irradiation cylindrical column photoreactor can be evaluated using the linear light source model. [15] The photoreactor and lamps were put in the wooden box the inside of which was covered with an aluminum foil.…”

Section: Methodsmentioning

confidence: 99%

UV light photo-Fenton degradation of polyphenols in oolong tea manufacturing wastewater

Sabaikai

Sekine

Tokumura

et al. 2013

Journal of Environmental Science and Health, Part A

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The UV light photo-Fenton degradation of oolong tea polyphenols in tea manufacturing effluent that color the wastewater to a dark brown has been examined. In order to elucidate the photo-Fenton degradation mechanism of oolong tea polyphenols and find the optimal dosages of the Fenton reagents, systematic study has been conducted. For the UV light photo-Fenton degradation of oolong tea effluent being 70 mg-(polyphenol) L(-1), the optimum dosages of Fenton reagents were found to be 20 mgL(-1) of total Fe and 500 mgL(-1) of H2O2. The polyphenol degradation could be divided into two stages. The polyphenols concentration rapidly decreased to around 30% of the initial concentration within 2 min and the degradation rate significantly slowed down in the subsequent stage. After 60 min of UV light irradiation, 97% polyphenol removal was obtained. The initial quick degradation of oolong tea polyphenols suggests that hydroxyl radical generated by the photo-Fenton process might preferentially attack polyphenols having high antioxidant activity by scavenging hydroxyl radicals. Almost complete decolorization of the oolong tea effluent was achieved after 80 min. About 96% mineralization of 63 mgL(-1) TOC loading was achieved within 60 min and then further mineralization was rather slow. The complete COD removal of 239 mgL(-1) COD loading was obtained after 100 min. The present results indicate that the UV light photo-Fenton degradation process can treat tea manufacturing wastewaters very effectively.

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Photocatalytic Degradation of Nonionic Surfactants with Immobilized TiO2 in an Airlift Reactor

Cited by 14 publications

References 15 publications

Photocatalytic Degradation of Organic Pollutants: A Review

Photocatalytic Degradation of Organic Pollutants: A Review

Photocatalytic Degradation of 1,5-Naphthalenedisulfonate on Colloidal Titanium Dioxide

UV light photo-Fenton degradation of polyphenols in oolong tea manufacturing wastewater

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