Degradation of 1,4-dioxane in water using TiO2 based photocatalytic and H2O2/UV processes

Coleman, Heather M.; Vimonses, Vipasiri; Leslie, Greg; Amal, Rose

doi:10.1016/j.jhazmat.2007.04.049

Cited by 179 publications

(69 citation statements)

References 28 publications

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“…In addition, in the presence of high concentration of peroxide, OH Á radicals preferentially react with the excess of H 2 O 2 . This undesirable reaction competes with the destruction of the dye chromophore (Galindo and Kalt 1999;Coleman et al 2007). Radical-radical reaction must also be taken into account (Konstantinou and Albanis 2004 An investigation on the decomposition of methylene blue by iron oxides at various concentrations of oxalate solutions showed that much higher concentration of hydroxyl radicals was generated by iron oxides compared with those from a commercial TiO 2 (ST-01), as determined by the coumarin method.…”

Section: Effect Of Oxidizing Agentmentioning

confidence: 99%

Parameters affecting the photocatalytic degradation of dyes using TiO2: a review

2015

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Traditional chemical, physical and biological processes for treating wastewater containing textile dye have such disadvantages as high cost, high energy requirement and generation of secondary pollution during treatment process. The advanced oxidation processes technology has been attracting growing attention for the decomposition of organic dyes. Such processes are based on the light-enhanced generation of highly reactive hydroxyl radicals, which oxidize the organic matter in solution and convert it completely into water, CO 2 and inorganic compounds. In this presentation, the photocatalytic degradation of dyes in aqueous solution using TiO 2 as photocatalyst under solar and UV irradiation has been reviewed. It is observed that the degradation of dyes depends on several parameters such as pH, catalyst concentration, substrate concentration and the presence of oxidants. Reaction temperature and the intensity of light also affect the degradation of dyes. Particle size, BETsurface area and different mineral forms of TiO 2 also have influence on the degradation rate.

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Section: Effect Of Oxidizing Agentmentioning

confidence: 99%

Parameters affecting the photocatalytic degradation of dyes using TiO2: a review

2015

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“…Conventional Fenton reactions are hampered, however, by the need for continuous supply of the Fenton reagents Fe(II) and H 2 O 2 to sustain contaminant degradation (1,17,23,25,33,40). Microbially driven Fenton reactions, on the other hand, alternately regenerate Fe(II) [via microbial Fe(III) reduction under anaerobic conditions] and H 2 O 2 (via microbial O 2 respiration under aerobic conditions), thus alleviating the need to continually supply the Fenton reagents to drive HO˙r adical production and contaminant degradation (32,36).…”

Section: Discussionmentioning

confidence: 99%

Section: A Microbially Driven Fenton Reaction System [Driven By the Fmentioning

confidence: 99%

“…Due to their high density and low aqueous phase solubility, TCE and PCE are also highly persistent in contaminated environments (3, 4). The potential carcinogen 1,4-dioxane is generally employed as a stabilizer for TCE and PCE in industrial processes (7-11), and thus, TCE-and PCE-contaminated groundwater is often commingled with 1,4-dioxane (9,(12)(13)(14)(15)(16)(17)(18)(19)(20).Current TCE and PCE remediation technologies are based on photolysis, sonolysis, and reductive transformations by iron-bearing minerals or dechlorinating microorganisms (6, 21-26). Photolysis and sonolysis, however, are limited by UV light penetration and low energy transfer efficiency, respectively (27-30), while microbially catalyzed reductive dehalogenation reactions are limited by microbial nutrient requirements, contaminant bioavailability, and incomplete dechlorination, leading to the production of toxic intermediates (31).…”

mentioning

confidence: 99%

“…The UV irradiation systems, however, are limited by UV light penetration, and H 2 O 2 must still be continuously supplied to drive the conventional Fenton reaction (32). Microbially driven Fenton reactions that alternately produce the Fenton reagents H 2 O 2 (via microbial O 2 respiration) and Fe(II) [via microbial Fe(III) reduction] alleviate the need for continual addition of H 2 O 2 and Fe(II) to drive HO˙radical production (12,17,32,40). The Fe(III)-reducing facultative anaerobe Shewanella oneidensis was recently employed to drive the Fenton reaction for oxidative degradation of PCP and 1,4-dioxane (32,36).…”

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confidence: 99%

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Simultaneous Transformation of Commingled Trichloroethylene, Tetrachloroethylene, and 1,4-Dioxane by a Microbially Driven Fenton Reaction in Batch Liquid Cultures

Sekar

Taillefert

DiChristina

2016

Appl Environ Microbiol

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Improper disposal of 1,4-dioxane and the chlorinated organic solvents trichloroethylene (TCE) and tetrachloroethylene (also known as perchloroethylene [PCE]) has resulted in widespread contamination of soil and groundwater. In the present study, a previously designed microbially driven Fenton reaction system was reconfigured to generate hydroxyl (HO˙) radicals for simultaneous transformation of source zone levels of single, binary, and ternary mixtures of TCE, PCE, and 1,4-dioxane. The reconfigured Fenton reaction system was driven by fed batch cultures of the Fe(III)-reducing facultative anaerobe Shewanella oneidensis amended with lactate, Fe(III), and contaminants and exposed to alternating anaerobic and aerobic conditions. To avoid contaminant loss due to volatility, the Fe(II)-generating, hydrogen peroxide-generating, and contaminant transformation phases of the microbially driven Fenton reaction system were separated. The reconfigured Fenton reaction system transformed TCE, PCE, and 1,4-dioxane either as single contaminants or as binary and ternary mixtures. In the presence of equimolar concentrations of PCE and TCE, the ratio of the experimentally derived rates of PCE and TCE transformation was nearly identical to the ratio of the corresponding HO˙radical reaction rate constants. The reconfigured Fenton reaction system may be applied as an ex situ platform for simultaneous degradation of commingled TCE, PCE, and 1,4-dioxane and provides valuable information for future development of in situ remediation technologies. IMPORTANCE A microbially driven Fenton reaction system [driven by the Fe(III)-reducing facultative anaerobe S. oneidensis] was reconfigured to transform source zone levels of TCE, PCE, and 1,4-dioxane as single contaminants or as binary and ternary mixtures.The microbially driven Fenton reaction may thus be applied as an ex situ platform for simultaneous degradation of at least three (and potentially more) commingled contaminants. Additional targets for ex situ and in situ degradation by the microbially driven Fenton reaction developed in the present study include multiple combinations of environmental contaminants susceptible to attack by Fenton reaction-generated HO˙radicals, including commingled plumes of 1,4-dioxane, pentachlorophenol (PCP), PCE, TCE, 1,1,2-trichloroethane (TCA), and perfluoroalkylated substances (PFAS).T he chlorinated organic solvents trichloroethylene (TCE) and tetrachloroethylene (also known as perchloroethylene [PCE]) have been historically employed as solvents in a variety of industrial processes, including vapor degreasing of metal surfaces, paint stripping, and dry cleaning (1, 2). TCE and PCE are carcinogenic, and improper disposal practices at industrial sites have resulted in widespread contamination of soil and groundwater (1-6). Due to their high density and low aqueous phase solubility, TCE and PCE are also highly persistent in contaminated environments (3, 4). The potential carcinogen 1,4-dioxane is generally employed as a stabilizer for TCE and PCE i...

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Nonspecific Methods for the Destruction of Hazardous Chemicals in the Laboratory

2012

Destruction of Hazardous Chemicals in the Laboratory

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Degradation of 1,4-dioxane in water using TiO2 based photocatalytic and H2O2/UV processes

Cited by 179 publications

References 28 publications

Parameters affecting the photocatalytic degradation of dyes using TiO2: a review

Parameters affecting the photocatalytic degradation of dyes using TiO2: a review

Simultaneous Transformation of Commingled Trichloroethylene, Tetrachloroethylene, and 1,4-Dioxane by a Microbially Driven Fenton Reaction in Batch Liquid Cultures

Nonspecific Methods for the Destruction of Hazardous Chemicals in the Laboratory

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