Degradation of methyl orange using short-wavelength UV irradiation with oxygen microbubbles

Tasaki, Tsutomu; Wada, Tsubasa; Fujimoto, Kanji; Kai, Shinji; Ohe, Kaoru; Oshima, Tatsuya; Baba, Yoshihiro; Kukizaki, Masato

doi:10.1016/j.jhazmat.2008.05.162

Cited by 130 publications

(59 citation statements)

References 43 publications

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“…The optimum pH of norfloxacin degradation ranged from7 to 9. Tasaki et al [8] also found that the optimum pH was at neutral range when studying the removal methyl orange by VUV. It was described that at too low pH, ozone generated by reaction of dissolved oxygen and VUV (Eq.…”

Section: A Effect Of Initial Concentrationsmentioning

confidence: 93%

Degradation of Paracetamol and Norfloxacin in Aqueous Solution Using Vacuum Ultraviolet (VUV) Process

Ratpukdi¹

2014

JOCET

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Abstract-The removal of pharmaceutical and personal care products (paracetamol and norfloxacin) in water by vacuum ultraviolet (VUV) process was studied. The effects of initial pharmaceutical concentrations (1, 5 and 10 mg/L), initial pHs (5, 7 and 9), VUV powers (30, 60 and 120 W) and bicarbonate concentrations (100 and 200 mg/L as CaCO 3 ) were investigated. The experiments under ultraviolet (UV) condition were performed for comparative purpose. The results showed that the VUV process exhibited superior degradation performance than that by the UV process. The rates of both paracetamol and norfloxacin removals were second order reaction. Higher concentrations resulted in the decrease of pharmaceutical degradation rate. The initial pH had slight impact on pharmaceutical removal efficiency and the neutral pH showed the highest degradation efficiency. Bicarbonate obviously decreased the pharmaceutical removal .This is due to from OH • scavenging and the VUV light absorption of the bicarbonate. For the effect of VUV powers, removal efficiencies increased as the increase of VUV powers.

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Section: A Effect Of Initial Concentrationsmentioning

confidence: 93%

Degradation of Paracetamol and Norfloxacin in Aqueous Solution Using Vacuum Ultraviolet (VUV) Process

Ratpukdi¹

2014

JOCET

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“…Reactions (3) and (4) occurred with UV light; atomic oxygen (O) was derived from the degradation of O 3 , and water could be converted into •OH. 8 As shown in formulas (4) and (6), hydroxyl radicals were formed in two ways. These hydroxyl radicals and triplet oxygen disproportionate to HOOO• (hydrogen-trioxide radical).…”

Section: Ro Production In Rvr Reactionmentioning

confidence: 99%

Dispersed-phase Interfaces between Mist Water Particles and Oxygen Plasma Efficiently Produce Singlet Oxygen (<sup>1</sup>O<sub>2</sub>) and Hydroxyl Radical (•OH)

et al. 2015

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Efficient generation of oxygen radicals and reactive oxygen was successfully performed at the dispersed-phasic interface between vapor-water and oxygen plasma in a reaction chamber having an internal atmosphere with a normal-pressure and temperature. In the space of the reactor chamber (radical vapor reactor [RVR]), the gas phase was strictly controlled in terms of vaporized water (small water mist), temperature, plasma conditions, and UV irradiation. According to spin-trapping electron spin resonance analysis, the RVR efficiently and quantitatively yielded two types of reactive oxygen species ( 1 O 2 and OH radical) with the atmosphere of the RVR chamber. This is the report of the efficient, quantitative production of reactive oxygen in an atmosphere. The reactivity of the produced 1 O 2 and OH radical may be applicable for various chemical processes, such as oxidation and electron absorption.

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“…The mean size of nanobubbles was 8.6 times larger than the mean pore size and unaffected by the flow velocity of air in the pores within a range of 0.5-3.7 ms −1 (Kukizaki and Goto, 2006). Microbubbles generated by SPG membranes can find applications in the production of aerated food products (Zúñiga and Aguilera, 2008), ultrasound contrast agents for ultrasonic examinations (Hou et al, 2009) and aerobic wastewater treatment , which can be combined with UV irradiation (Tasaki et al, 2009) or activated sludge process (Liu et al, 2012b).…”

Section: Gas Dispersion Using Spg Membranementioning

confidence: 99%

High-pressure Homogenizer Design

Rayner¹

2015

Engineering Aspects of Food Emulsification and Homogenization

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Degradation of methyl orange using short-wavelength UV irradiation with oxygen microbubbles

Cited by 130 publications

References 43 publications

Degradation of Paracetamol and Norfloxacin in Aqueous Solution Using Vacuum Ultraviolet (VUV) Process

Degradation of Paracetamol and Norfloxacin in Aqueous Solution Using Vacuum Ultraviolet (VUV) Process

Dispersed-phase Interfaces between Mist Water Particles and Oxygen Plasma Efficiently Produce Singlet Oxygen (<sup>1</sup>O<sub>2</sub>) and Hydroxyl Radical (•OH)

High-pressure Homogenizer Design

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Degradation of methyl orange using short-wavelength UV irradiation with oxygen microbubbles

Cited by 130 publications

References 43 publications

Degradation of Paracetamol and Norfloxacin in Aqueous Solution Using Vacuum Ultraviolet (VUV) Process

Degradation of Paracetamol and Norfloxacin in Aqueous Solution Using Vacuum Ultraviolet (VUV) Process

Dispersed-phase Interfaces between Mist Water Particles and Oxygen Plasma Efficiently Produce Singlet Oxygen (<sup>1</sup>O<sub>2</sub>) and Hydroxyl Radical (&bull;OH)

High-pressure Homogenizer Design

Contact Info

Product

Resources

About

Dispersed-phase Interfaces between Mist Water Particles and Oxygen Plasma Efficiently Produce Singlet Oxygen (<sup>1</sup>O<sub>2</sub>) and Hydroxyl Radical (•OH)