Products of Hexachlorocyclopentadiene (C-56) in Aqueous Solution

Chou, Sheng-Fu J.; Griffin, Robert A.; Chou, Mei-In M.; Larson, Richard A.

doi:10.1897/1552-8618(1987)6[371:pohcia]2.0.co;2

Cited by 5 publications

(5 citation statements)

References 9 publications

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“…Another treatment alternative of hazardous wastes that has been studied is direct photolysis (Chou et al, 1987;Mill et al, 1981;Zepp and Cline, 1977). During direct photolysis, the chemical directly absorbs the incident radiation and then degrades.…”

Section: Introductionmentioning

confidence: 99%

Visible‐Light‐Sensitized Dechlorination of Perchloroethylene

Lin

Jou

Wang

2009

Water Environment Research

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An aqueous reaction mixture containing perchloroethylene (PCE), a photosensitizer, and an electron donor was irradiated by visible lamps to facilitate a sunlight-sensitized dechlorination reaction. Various types of lamps, electron donors, and photosensitizers were examined, to compare the rates of dechlorination. Of the six photosensitizers evaluated, methylene blue was the most effective. Electron donors varied in effectiveness, as follows: trimethylamine . triethylamine . tributylamine. The intermediates and reaction products were identified by a purge-and-trap gas chromatography mass spectrometer system. The photosensitized dechlorination method degraded PCE via an electron-transfer-relay mechanism. Degradation products identified were trichloroethylene, dichloroethylenes, and chloroethylene. It seems a sequential dechlorination pathway was followed. The PCE dechlorination in a natural sunlight irradiation test was shown to be more effective than any of the simulated visible light sources. The result supports the feasibility of future development of solarpowered dechlorination remediation systems with the use of sunlight, nontoxic dyes, and electron donors. Water Environ. Res., 81, 76 (2009).

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Section: Introductionmentioning

confidence: 99%

Visible‐Light‐Sensitized Dechlorination of Perchloroethylene

Lin

Jou

Wang

2009

Water Environment Research

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“…The literature contains several models of isotherms of water adsorption on alumina. Attempts have been made, for example, to linearize the isotherm: this simple method is, however, worthless when the slopes are as clearly inflected as in our case. A more fruitful method subjects the isotherm, cut up into several segments, to a polynomial mathematical treatment .…”

Section: Resultsmentioning

confidence: 76%

Optimization of the Textural Characteristics of an Alumina To Capture Contaminants in Natural Gas

et al. 1996

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Capillary condensation of water can seriously impair the performance of an adsorbent intended for use in removing contaminants (mercury, arsenic, sulfur, etc.) in natural gas. Adsorption and desorption isotherms were used to determine how the nature and pore structure distribution of the adsorbent (alumina, active cabon) affect water adsorption. The contribution of the different phenomena involved (chemisorption, physisorption, capillary condensation) have been determined. The threshold of capillary condensation is reached much more rapidly on active carbon and microporous alumina (40% relative humidity) than on a highly mesoporous alumina (75−80% relative humidity).

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“…It was also recognized that tetrachlorocyclobutenes and -butynes have the same molecular formula as the TCBDs. Indeed, penta- and hexachlorocyclobutenes have been reported in environmental samples. , …”

Section: Resultsmentioning

confidence: 99%

Environmental Analysis by ab Initio Quantum Mechanical Computation and Gas Chromatography/Fourier Transform Infrared Spectrometry

and¹,

Titus²,

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et al. 1996

Anal. Chem.

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Computational chemistry, in conjunction with gas chromatography/mass spectrometry/Fourier transform infrared spectrometry (GC/MS/FT-IR), was used to tentatively identify seven tetrachlorobutadiene (TCBD) isomers detected in an environmental sample. Computation of the TCBD infrared spectra was performed with the Gaussian quantum chemistry software. The Hartree-Fock/6-31G* level of theory was employed, with IR frequencies scaled by a standard factor of 0.89. This approach shows great promise as a means of characterizing or confirming environmental analyte identifications when standard spectra, or pure standards required to measure standard spectra, are unavailable.

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Products of Hexachlorocyclopentadiene (C-56) in Aqueous Solution

Cited by 5 publications

References 9 publications

Visible‐Light‐Sensitized Dechlorination of Perchloroethylene

Visible‐Light‐Sensitized Dechlorination of Perchloroethylene

Optimization of the Textural Characteristics of an Alumina To Capture Contaminants in Natural Gas

Environmental Analysis by ab Initio Quantum Mechanical Computation and Gas Chromatography/Fourier Transform Infrared Spectrometry

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