Contribution of free radicals to chlorophenols decomposition by several advanced oxidation processes

Benítez, F. Javier; Beltrán‐Heredia, J.; Acero, Juan L.; Rubio, Francisco

doi:10.1016/s0045-6535(99)00536-6

Cited by 174 publications

(78 citation statements)

References 21 publications

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“…To mineralize the contaminants thoroughly, advanced oxidation processes (AOPs) have been used for the treatment of drinking water sources and for the remediation of contaminated waters. [1][2][3][4] AOPs include TiO 2 and ultraviolet radiation (UV), ozone (O 3 ) and UV, the Fenton reagent (H 2 O 2 /Fe 2+ ), H 2 O 2 and UV, O 3 with H 2 O 2 , high-frequency ultrasound waves, γ rays, and high-energy electrons, etc. [5][6][7][8] The feasibility of these processes has been verified experimentally.…”

Section: Introductionmentioning

confidence: 99%

Thermodynamic Analysis on the Mineralization of Trace Organic Contaminants with Oxidants in Advanced Oxidation Processes

Yang

et al. 2009

Ind. Eng. Chem. Res.

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There is a growing demand for the efficient treatment of organic polluted wastewaters by advanced oxidation processes (AOPs) which calls for the determination of the mineralization order of ease for the organic contaminants with oxidants. The mineralization abilities of organic contaminants in AOPs are investigated in this work. Photocatalytic experiments for three representative organic contaminants are carried out, and their corresponding reaction rates are determined experimentally. Meanwhile, molar Gibbs free energy changes ∆ r G m°f or the reactions of 31 organic contaminants (10 chlorinated hydrocarbons, four brominated hydrocarbons, 11 aromatic hydrocarbons and their derivatives, three chloroacetic acid, and three chloroacetyl chloride) with oxidants of• OH, H 2 O 2 ,• O -, O 3 , and O 2 are calculated, and the mineralization order of ease is determined theoretically on the basis of ∆ r G m°. The agreement of the theoretical and experimental mineralization abilities for most of the organic contaminants investigated implies the reliability of the determination of the mineralization ability from the magnitude of ∆ r G m°f or the mineralization of trace organic contaminants. Results also show that for most of the organic contaminants studied, the mineralization abilities are, and the mineralization ability of the organic contaminants depends on not only the oxidants but also the structure and properties of the organic contaminants themselves, and the degradation reaction products.

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Section: Introductionmentioning

confidence: 99%

Thermodynamic Analysis on the Mineralization of Trace Organic Contaminants with Oxidants in Advanced Oxidation Processes

Yang

et al. 2009

Ind. Eng. Chem. Res.

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“…Combined with UV, the oxidation processes have been used in destroying carcinogens and hazardous contaminants like gaseous hexamethyl disilazane (HMDS) (Chao et al 2007), gaseous 1,3-butadiene (Chou et al, 2005), aqueous refractory compounds such as 2,2,3,3,-tetrafluoro-propanol (TFP) from CD-R and DVD-R production (Chou and Chang, 2007) and some chlorophenols (Benitez et al, 2000). However, removal efficiency of low concentration of indoor volatile organic compounds (VOCs) by ozonation process alone was proven to be low, and the carbon-carbon bonds in unsaturated VOCs may lead to the formation of harmful intermediates (Weschler, 2000).…”

Section: Introductionmentioning

confidence: 99%

Ozonation of Odorous Compounds in Gases Emitted from Rubber Processing Industries

Perng

Cheng

Wang

et al. 2011

Aerosol Air Qual. Res.

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This study aimed at the removal of odorous compounds in gases emitted from rubber processing industries. Simulated odorous gas for test was prepared by mixing fresh air and an odorous gas drawn from an oven in which a sample of rubber powder was kept either at 160°C (for a thermal plastic rubber) or 200°C (for a thermal setting rubber). The prepared odorous gas was then premixed with a definite amount of ozone-enriched air and introduced into a contact system. The contact system consists of two sieve-plate columns connected in series and each column has four 1-L chambers. Depending on with or without introducing circulating scrubbing water into the columns, the oxidation reaction could be either wet or dry one.Results indicate the wet oxidation got better performances than the dry one. The former got 97 and over 90% removal of VOCs (volatile organic compounds) and odorous intensity removal, respectively, with the operation conditions of initial ozone concentration 4.0 ppm, THC (total hydrocarbon) concentrations 6.5-10.3 ppm (methane equivalent), oxidation temperature 37.3°C, gas empty bed retention time (EBRT) 12 s, and liquid/gas rate ratio 0.01 m 3 /m 3 . With conditions similar to those cited above, odor concentration (dilutions to the threshold, D/T) in the test gas could be reduced from 1,738-3,090 to 31-98 with EBRTs of 11.4-14.5 s. Activated carbon is effective for both physical and chemical removals of residual VOCs, odorous compounds, and ozone in the effluent gas from the ozonation system. Economical analysis indicates that around US$ 0.16 is required for treating 1,000 m 3 of the tested foul gas by the proposed ozonation process.

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“…While the ultraviolet light/hydrogen peroxide process has attracted considerable attention due to its usefulness for the purification of underground or drinking water and for the water treatment of industrial effluents (Benitez et al, 2000;BeltranHeredia et al, 2001;Jo et al, 2002;Santiago et al, 2002;Zhang et al, 2003;Jeong et al, 2005), few studies have been reported on the application of this process to the oxidation of gaseous VOCs. (Feitz et al, 2002;Alibegic et al, 2003).…”

Section: Introductionmentioning

confidence: 99%

Photo-Oxidation of Ethylene with Hydrogen Peroxide

Sugawara

Suzuki

Sugawara

et al. 2009

J. Chem. Eng. Japan

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Contribution of free radicals to chlorophenols decomposition by several advanced oxidation processes

Cited by 174 publications

References 21 publications

Thermodynamic Analysis on the Mineralization of Trace Organic Contaminants with Oxidants in Advanced Oxidation Processes

Thermodynamic Analysis on the Mineralization of Trace Organic Contaminants with Oxidants in Advanced Oxidation Processes

Ozonation of Odorous Compounds in Gases Emitted from Rubber Processing Industries

Photo-Oxidation of Ethylene with Hydrogen Peroxide

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