A review of synergistic effect of photocatalysis and ozonation on wastewater treatment

Agustina, Tuty Emilia; Ang, Ha Ming; Vareek, V.K

doi:10.1016/j.jphotochemrev.2005.12.003

Cited by 494 publications

(259 citation statements)

References 58 publications

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“…OH (Kiwi, et al, 2000). (Agustina, et al, 2005;Farre, et al, 2005). The 2, 4-D degradation rates in O 3 and O 3 / UV/TiO 2 were about 2.3 and 4.9 times of UV/TiO 2 , while the value for O 3 /UV/TiO 2 was about 2.2 times of O 3 .…”

Section: Resultsmentioning

confidence: 90%

“…Ozonation (O 3 ) and photocatalysis (UV/TiO 2 ) are widely investigated advanced oxidation processes (AOP) for treating contaminated waters (Djebbar and Sehili, 1998;Yao, et al, 1998;Drzewicz, et al, 2004;Singh and Muneer, 2004). Ozonation alone is less effective, since its reaction with organic contaminants is selective (Brillas, et al, 2003;Agustina, et al, 2005;Li, et al, 2005) and generation of free radicals from its decomposition takes place only at elevated pH conditions (Munter, 2001). Oxidation of contaminants in UV/TiO 2 system involves free hydroxyl radical ( .…”

Section: Introductionmentioning

confidence: 99%

“…OH), but separation of TiO 2 catalyst in suspension has been a major obstacle. Although recent developments in TiO 2 film and fiber catalysts can overcome the problem, mere photocatalysis is reported to be less efficient for several organic contaminants (Agustina, et al, 2005;Li, et al, 2005;Terashima, et al, 2006). Photocatalytic ozonation (O 3 /UV/TiO 2 ) is emerging as a more promising oxidation method for refractory organic contaminants due to a large number of .…”

Section: Introductionmentioning

confidence: 99%

“…Photocatalytic ozonation (O 3 /UV/TiO 2 ) is emerging as a more promising oxidation method for refractory organic contaminants due to a large number of . OH generation (Agustina, et al, 2005;Beltran, et al, 2005;Li ,et al, 2005;Farre, et al, 2005). Few literatures are available on the O 3 /UV/TiO 2 process,because its use is relatively new, while successful use of TiO 2 fiber catalyst is expected to be a milestone in practical applications of the UV/TiO 2 and O 3 /UV/TiO 2 processes.…”

Section: Introductionmentioning

confidence: 99%

See 3 more Smart Citations

Photocatalytic ozonation of 2, 4-dichlorophenoxyacetic acid in water with a new TiO2 fiber

Giri

Ozaki

Taniguchi

et al. 2007

Int. J. Environ. Sci. Technol.

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More effective techniques are required to mineralize the increasing number of recalcitrant organic contaminants at low concentrations in the water environment using advanced oxidation process. Though relatively new, photocatalytic ozonation (O 3 /UV/TiO 2 ) is considered superior to ozonation (O 3 ) and photocatalysis (UV/TiO 2 ), due to synergistic effects and use of immobilized TiO 2 photocatalysts is a milestone in advance oxidation process. This article aimed to elucidate 2, 4-dichlorophenoxyacetic acid (2, 4-D) mineralization characteristics in low aqueous solutions by O 3 /UV/TiO 2 using the world's first high-strength TiO 2 fiber catalyst in laboratory experiments. 2, 4-D degradation and TOC removal in O 3 , UV/TiO 2 and O 3 /UV/TiO 2 followed pseudo-first order reaction kinetic. The removal rates for 2, 4-D and TOC in O 3 /UV/TiO 2 were respectively about 1.5 and 2.4-fold larger than the summation of the corresponding values in O 3 and UV/TiO 2 . The O 3 /UV/TiO 2 process was characterized by short-lived few aromatic intermediates, faster degradations of aliphatic intermediates and dechlorination as a major step in 2, 4-D mineralization. The significantly enhanced 2, 4-D mineralization in the process was attributed to increased ozone decomposition and reduced electron-hole recombination on TiO 2 surface resulting to a large number of . OH generation. The O 3 /UV/TiO 2 process with the TiO 2 fiber catalyst was very promising with respect to the major challenges being faced in AOP involving TiO 2 , namely separation of powder catalyst in suspension and reduced efficiency of immobilized catalysts (e.g. TiO 2 film/fiber).

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Section: Resultsmentioning

confidence: 90%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Photocatalytic ozonation of 2, 4-dichlorophenoxyacetic acid in water with a new TiO2 fiber

Giri

Ozaki

Taniguchi

et al. 2007

Int. J. Environ. Sci. Technol.

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“…Ozonation has been widely applied in water treatment throughout the world, especially for the treatment of various organic compounds (44)(45)(46). Through direct oxidation, ozone can react with organic pollutants, although it is relatively slow and selective; through indirect reaction, reactive radicals (mainly • OH) can be generated via ozone decomposition in the presence of nanomaterials as catalysts for the degradation of different organics contaminants.…”

Section: Advances In Ozonation Applications While Employing Nanomatermentioning

confidence: 99%

Nanotechnology Solutions for Global Water Challenges

McGuinness

Garvey

Whelan

et al. 2015

ACS Symposium Series

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The lack of clean and safe drinking water is responsible for more deaths than war, terrorism and weapons of mass destruction combined. This suggests contaminated water poses a significant threat to human health and welfare. In addition, standard water disinfection approaches such as sedimentation, filtration, and chemical or biological degradation are not fully capable of destroying emerging contaminants (e.g. pesticides, pharmaceutical waste products) or certain types of bacteria (e.g. Cryptosporidium parvum). Nanomaterials and nanotechnology based devices can potentially be employed to solve the challenges posed by various contaminants and

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Ozone Applications

Заиков

Rakovsky

Anachkov

2008

Kirk-Othmer Encyclopedia of Chemical Technology

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Ozone applications are based on the powerful oxidative action of ozone. The ozonolysis of chemical and biochemical compounds, as a rule, takes place with high rates at low temperatures and activation energies. This result provides a basis for the development of novel and improved technologies, which find wide application in ecology, chemical, pharmaceutical, cosmetics, cellulose, paper and sugar industries, microelectronics, and many others. This article focuses on technologies for purification of waste gases, water and soils, manufacture of polymer and inorganic materials, cleanup and preparation of surfaces for electronics, superconductors, and more.

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A review of synergistic effect of photocatalysis and ozonation on wastewater treatment

Cited by 494 publications

References 58 publications

Photocatalytic ozonation of 2, 4-dichlorophenoxyacetic acid in water with a new TiO2 fiber

Photocatalytic ozonation of 2, 4-dichlorophenoxyacetic acid in water with a new TiO2 fiber

Nanotechnology Solutions for Global Water Challenges

Ozone Applications

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