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RISS 인기검색어
- 검색키워드
- 저자 : Ines Nitoi (검색결과 3 건)
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Mechanism and kinetic study for the degradation of lindane by photo-Fenton process
Ines Nitoi,Petruta Oancea,Tatiana Oncescu 한국공업화학회 2013 Journal of Industrial and Engineering Chemistry Vol.19 No.1
Because application of classical treatment methods cannot allow an easily Lindane (gamma 1a,2a,3b,4a,5a,6b-hexachlorocyclohexane) degradation, development of more powerful water treatment techniques, like advanced oxidation processes (AOPs), was necessary. The degradation of lindane (g-HCH) has been studied using the photo-Fenton reaction. The degradation kinetics under irradiation was optimized in respect to H2O2 concentration and Fe2+ concentration at a constant lindane concentration. The degradation rate follows pseudo-first order kinetics with respect to lindane and organic clorine mineralization. Application of photo-Fenton system also assures total organic carbon removal with 95% efficiency at 2 h irradiation. The possible pathways of lindane photodegradation is also proposed. 2012 The Korean Society of Industrial and Engineering Chemistry. Published by Elsevier B.V. All rights reserved.
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UV–VIS photocatalytic degradation of nitrobenzene from water using heavy metal doped titania
Ines Nitoi,Petruta Oancea,Malina Raileanu,Maria Crisan,Lucian Constantin,Ionut Cristea 한국공업화학회 2015 Journal of Industrial and Engineering Chemistry Vol.21 No.1
The photocatalytic degradation of nitrobenzene (NB) under UV–VIS irradiation with un-doped TiO2 andvarious heavy metals doped TiO2 powders were studied for aerated solutions. The dopant type (Fe, Co,Ni) and its concentration (0.5–5 wt.% TiO2) influence on pollutant degradation efficiency wereinvestigated. The photocatalyst with lowest Fe content (0.5 wt.%) showed a considerable betterbehaviour in respect to pollutant degradation than catalyst with higher Fe content and Co and Ni dopedtitania catalysts. The experiments were carried out for solutions with (0.37–8.45) 10 4 M NB initialcontent, using 50–250 mg/L catalyst dose, at various pHs (4–10) and irradiation time between 30 and240 min. The kinetics of NB degradation and organic nitrogen mineralization was assessed and pseudofirstorder rate constants were calculated. For optimum working conditions (0.5 wt.% Fe doped-TiO2loading of 250 mg/L, 2.52 10 4 Mpollutant initial concentration, pH = 7 and 240 min irradiation time)NB removal and organic nitrogen mineralization efficiencies were 99% and 85%, respectively. It was alsodemonstrated that degradation process occurs on catalyst surface, so experimental results are inaccordance with Langmuir–Hinshalwood model.
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Possible degradation pathways of triclosan from aqueous systems via TiO2 assisted photocatalyis
Lucian Alexandru Constantin,Ines Nitoi,Nicolae Ionut Cristea,Mirela Alina Constantin 한국공업화학회 2018 Journal of Industrial and Engineering Chemistry Vol.58 No.-
Triclosan (TCS) is an antimicrobial agent used for personal care products that cannot be removed bywastewater treatment classical processes. TCS persistence and toxicity is asking for alternative treatmentmethods such as TiO2 assisted photocatalyse. Due to the fact that within the literature are presentedvarious pathways for TCS degradation via UV/TiO2 photocatalysis, some data being contradictory,research work aimed to propose a degradation mechanism supported by as many experimental data. TCSdegradation pathways confirmed by experimental results were: addition of hydroxyl radicals at TCS nonphenolicring, proton extraction by hydroxyl radicals and direct interaction with photo generatedelectrons.
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