Photolytic and photocatalytic treatment of an aqueous solution containing microbial cells and organic compounds in an annular-flow reactor

Shiraishi, Fumihidé; Toyoda, Kentaro; Fukinbara, Satoru; Obuchi, Eiko; Nakano, Katsuyuki

doi:10.1016/s0009-2509(99)00068-8

Cited by 44 publications

(17 citation statements)

References 15 publications

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“…Similar results were found by Shiraish who also reported that formaldehyde, while exposed to the photolysis process using a 254-nm wavelength, did not degrade well [21]. Guimarães also found that formaldehyde was not degraded appropriately by using the photolysis process (254 nm as wavelength) [3].…”

Section: Formaldehyde Degradation By Photolysis Processsupporting

confidence: 77%

Application of enhanced nZnO photocatalytic process with ultrasonic wave in formaldehyde degradation from aqueous solution

Amin

Teimouri

Sadani

et al. 2015

Desalination and Water Treatment

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A B S T R A C TThis study was performed to evaluate formaldehyde degradation ratio in a batch reactor. For investigation of the synergism effect, formaldehyde degradation by each process (UV photolysis, ZnO catalyst, ultrasonic wave) was tested. In the next step, the influence of important operational parameters, such as pH of the solution (3-8), initial CH 2 O concentration (20-100 mg/l), dosage of nZnO (10-60 mg/l), ultrasonic wave power (40-150 W), and reaction time (10-60 min) was investigated. Ultrasonic wave process could slightly degrade CH 2 O and had a partial effect as synergism on formaldehyde degradation. Maximum formaldehyde removal ratio occurred with a nZnO dosage of 60 mg/l, pH of the solution of 8, ultrasonic wave power of 40 W, and initial formaldehyde concentration of 50 mg/l with a contact time of 30 min (78%). A comparison of the reaction orders of kinetic studies showed that formaldehyde degradation was in accordance with pseudo-second-order reaction. It could be found that the sonophotocatalytic process may be recommended for the treatment of solutions containing low formaldehyde concentrations.

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Section: Formaldehyde Degradation By Photolysis Processsupporting

confidence: 77%

Application of enhanced nZnO photocatalytic process with ultrasonic wave in formaldehyde degradation from aqueous solution

Amin

Teimouri

Sadani

et al. 2015

Desalination and Water Treatment

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show abstract

“…Irradiation of TiO 2 particles with UV light generates highly reactive oxidants, such as hydroxyl radicals, superoxide anions, hydrogen peroxide, and other reactive oxygen species, as a result of oxidative and reductive reactions. These highly reactive oxidants cause oxidative decompositions of organic compounds adsorbed on the TiO 2 surface [11][12][13]. The organic compounds decomposed by these photocatalytic reactions are finally mineralized to CO 2 , H 2 O, and other mineral ions, such as PO 4 3− , SO 4 2− , Cl − , and a mixture of NH 4 + , NO 2 − , and NO 3 − if such compounds contain P, S, Cl, and N, respectively [14].…”

Section: Introductionmentioning

confidence: 99%

Photocatalytic and adsorptive treatment of 2,4-dinitrophenol using a TiO2 film covering activated carbon surface

Cao

Oda

Shiraishi

2010

Chemical Engineering Journal

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a b s t r a c tAnatase titanium dioxide (TiO 2 ) in particle sizes of roughly 0.5-20 m was prepared from amorphous TiO 2 in an aqueous H 2 O 2 solution by heating at 90 • C for 9 h and directly deposited on a PET film. On the other hand, granular activated carbon (AC) particles in sizes of 1-2 mm in diameter were adhesively deposited on a PET film, and their surfaces were also coated with TiO 2 . The resulting three preparations (TiO 2 -, AC-, and TiO 2 /AC-PET films) were set up in an annular-flow reactor to treat aqueous solutions of 2,4-dinitrophenol (DNP) in a batch-recirculation mode. The rate of DNP adsorption onto the TiO 2 /AC-PET film without UV irradiation was almost the same as that onto the AC-PET film, indicating that the attraction of DNP to AC was not lowered in the presence of TiO 2 film. Observation of SEM photographs suggests that this result is attributed to the porous structure of the thin TiO 2 film covering AC particles. The rate of DNP removal by the TiO 2 -AC PET film under UV irradiation was 2.9 times higher than that by the TiO 2 -PET film under UV irradiation, and was 1.1 times higher than the rate of DNP adsorption onto the AC-PET film. The rate of DNP removal by the AC-PET film decreased by 40% after six runs, while that by the TiO 2 /AC-PET film decreased by 22%. Durable experiments using the TiO 2 /AC-PET and AC-PET films clarified that the lifetime of the TiO 2 /AC-PET film is at least two times longer than that of the AC-PET film. This result suggests that DNP molecules are photocatalytically decomposed when passing through the porous TiO 2 -PET film, which lessens a burden of DNP adsorption on AC. Moreover, the DNP treatments in the batch-recirculation flow system suggested that the TiO 2 /AC-PET film saturated with DNP can be successfully regenerated at 60 • C.

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“…2-NP may be released to the environment in wastewater and as fugitive emissions during its production and use as a chemical intermediate [3]. 4-NP will enter the environment during its production and use as an interme- [6], photocatalytic conversion in slurry reactors using TiO 2 [7] and UV irradiation [8,9], degradation of aqueous nitrophenol solutions by electron beam irradiation [10], etc. Adsorption technology has been extensively applied for the removal of a wide spectrum of organic compounds from aqueous medium.…”

Section: Introductionmentioning

confidence: 99%

Comparative modelling of mono- and dinitrophenols sorption on yellow bentonite from aqueous solutions

Yaneva

Koumanova

2006

Journal of Colloid and Interface Science

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Photolytic and photocatalytic treatment of an aqueous solution containing microbial cells and organic compounds in an annular-flow reactor

Cited by 44 publications

References 15 publications

Application of enhanced nZnO photocatalytic process with ultrasonic wave in formaldehyde degradation from aqueous solution

Application of enhanced nZnO photocatalytic process with ultrasonic wave in formaldehyde degradation from aqueous solution

Photocatalytic and adsorptive treatment of 2,4-dinitrophenol using a TiO2 film covering activated carbon surface

Comparative modelling of mono- and dinitrophenols sorption on yellow bentonite from aqueous solutions

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