Synergy of ozonation and photocatalysis to mineralize low concentration 2,4-dichlorophenoxyacetic acid in aqueous solution

Giri, Rabindra Raj; Ozaki, Hiroaki; Ishida, Toshihisa; Takanami, Ryohei; Taniguchi, Shigeji

doi:10.1016/j.chemosphere.2006.08.007

Cited by 60 publications

(32 citation statements)

References 17 publications

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“…For this reason, Giri et al (2007) studied its degradation with a heterogeneous advanced oxidation process (O 3 /TiO 2 /UV). In all cases, the UV radiation used was 10 W. The results showed that the degradation of 2,4-D was significantly greater when this system was used.…”

Section: Photocatalytic Ozonationmentioning

confidence: 99%

Advanced Oxidation Processes for Wastewater Treatment: State of the Art

Poyatos

Muñío

Almécija

et al. 2009

Water Air Soil Pollut

425

174

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The protection and conservation of natural resources is one of the main priorities of modern society. Water is perhaps our most valuable resource, and thus should be recycled. Many of the current recycling techniques for polluted water only concentrate the pollutant without degrading it or eliminating it. In this sense, advanced oxidation processes are possibly one of the most effective methods for the treatment of wastewater containing organic products (effluents from chemical and agrochemical industries, the textile industry, paints, dyes, etc.). More conventional techniques cannot be used to treat such compounds because of their high chemical stability and/or low biodegradability. This article describes, classifies, and analyzes different types of advanced oxidation processes and their application to the treatment of polluted wastewater.

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Section: Photocatalytic Ozonationmentioning

confidence: 99%

Advanced Oxidation Processes for Wastewater Treatment: State of the Art

Poyatos

Muñío

Almécija

et al. 2009

Water Air Soil Pollut

425

174

View full text Add to dashboard Cite

show abstract

“…the accumulation of disposed residues in natural waters (Bucheli, Grüebler, Müller, & Schwarzenbach, 1997). There have been many studies on the removal of chlorophenoxy herbicides using titanium dioxide (Bahnemann, Muneer, & Haque, 2007;Giri, Ozaki, Ishida, Takanami, & Taniguchi, 2007;Kamble, Sawant, & Pangarkar, 2006;Singh, Saquib, Haque, & Muneer, 2007;Tanaka & Reddy, 2002) Very little work involved ZnO (Djebbar & Sehili, 1998). Since ZnO has almost the same band gap energy (3.2 eV) as TiO 2 , its photocatalytic capability is anticipated to be similar to that of TiO 2 .…”

Section: Introductionmentioning

confidence: 99%

Photodegradation of Chlorophenoxyacetic Acids by ZnO/r-Fe2O3 Nanocatalysts: A Comparative Study

Abdullah¹,

Mun²,

Zainal³

et al. 2013

IJC

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ZnO/γ-Fe 2 O 3 nanocomposite was synthesized via simple precipitation. The synthesized nanocatalysts underwent heat treatment at 450 o C for an hour. The characteristics of the nanocomposite were investigated by XRD, TEM, and BET surface area measurement. Zeta potential analysis was used to examine the surface charge properties of the nanocatalysts. The synthesized nanocomposite has an average particle size of 11 nm and a surface area of 20 m 2 g -1 . The potential of ZnO/γ-Fe 2 O 3 as a photocatalyst was evaluated by photodegrading chlorophenoxyacetic acids (PAA, 2,4-D, 2,4,5-T and 4CA). The decomposition of chlorophenoxyacetic acids by ZnO/γ-Fe 2 O 3 followed 4CA > 2,4,5-T ≈ 2,4-D > PAA. The result indicates the applicability of ZnO/γ-Fe 2 O 3 nanocomposite as a photocatalyst in removing organic pollutants in wastewater.

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“…To avoid deactivation of photocatalysts and increase the efficiency of mineralization of contaminants, addition of ozone has been the focus of much recent research (Kim et al, 2003;Kasprzyk-Hordern et al, 2003;Pengyi et al, 2003;Einaga and Futamura, 2004;Zhang and Liu, 2004;Giri et al, 2007). In photocatalyst ozonization, the photocatalytic oxidation rate greatly increases due to synergistic photocatalytic and photochemical effects in the combined systems (Jeong et al, 2004;Jeong et al, 2005;Jeong et al, 2006).…”

Section: Introductionmentioning

confidence: 99%

Removal of Ethylene and Secondary Organic Aerosols Using UV-C254 + 185 nm with TiO2 Catalyst

Chang

Sekiguchi

Wang

et al. 2013

Aerosol Air Qual. Res.

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In this investigation we evaluated the feasibility and effectiveness of ozone-producing UV (254 + 185 nm) irradiation and a TiO 2 photocatalyst for degradation of ethylene, which is strongly hydrophobic and does not decompose easily in a humid environment. Tests were performed in a photoreactor (V = 0.55 L) under UV irradiation at various wavelengths (365, 254 and 254 + 185 nm), relative humidities (RH < 1% and RH > 86%), atmospheres (pure N 2 and air), residence times (11-33 sec), initial ethylene concentrations in the range of 25-105 ppmv and TiO 2 contact areas (86.4-259 cm 2 ) with presumably ambient pressure and temperature.The experimental results demonstrated that the use of TiO 2 under 254 + 185 nm UV irradiation significantly enhanced the photodegradation of ethylene compared to the case of UV irradiation alone, due to the synergistic effect of photochemical oxidation in the gas phase and photocatalytic oxidation on the TiO 2 surface. Photodegradation induced with 254 + 185 nm UV irradiation was compared with photodegradation induced with UV irradiation at wavelengths of 365 and 254 nm. The highest conversion and mineralization levels were obtained with 254 + 185 nm UV irradiation among the three tested UV sources. Moreover, irradiating with 254 +185 nm light generated secondary organic aerosols (SOA) via gas-to-particle conversion of organic compounds in the air stream. The results indicate that the concentration of generated SOAs decreased in the presence of the TiO 2 catalyst, and thus that TiO 2 may be used to effectively control the emissions of undesirable SOAs.In an application test, for photocatalytic oxidation with 254 + 185 nm UV irradiation, corresponding to a flow rate of 0.5 L/min, and an initial concentration of 34 ppmv, over 90% of the inlet ethylene could be degraded.

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Synergy of ozonation and photocatalysis to mineralize low concentration 2,4-dichlorophenoxyacetic acid in aqueous solution

Cited by 60 publications

References 17 publications

Advanced Oxidation Processes for Wastewater Treatment: State of the Art

Advanced Oxidation Processes for Wastewater Treatment: State of the Art

Photodegradation of Chlorophenoxyacetic Acids by ZnO/r-Fe2O3 Nanocatalysts: A Comparative Study

Removal of Ethylene and Secondary Organic Aerosols Using UV-C254 + 185 nm with TiO2 Catalyst

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