Photoinduced decomposition of trichloroethylene in soil components

Tao, T; Yang, J J; Maciel, G E

doi:10.1021/es980435a

Title: Photoinduced decomposition of trichloroethylene in soil components

Full Record
Other Related Research

Abstract

The photoinduced decomposition of trichloroethylene adsorbed on Ca-montmorillonite by long-wavelength UV irradiation has been studied in a quartz tube open to air or through which air or oxygen is passed. Solid-sample and liquid-solution NMR techniques were used to identify apparent products or intermediates of the photodecomposition. Dichloroacetic acid was identified as a major organic product/intermediate; substantial amounts of pentachloroethane and trichloroacetic acid were also identified. The formation of CO{sub 2} was characterized quantitatively by wet chemical analysis. About 40% and 57%, respectively, of the total carbon of trichloroethylene was converted to carbon dioxide in air and O{sub 2} environments over a period of 16 days. Phosgene and HCl were also detected. The photodecomposition of trichloroethylene adsorbed on whole soil, on Zn{sup 2+}-exchanged and Cu{sup 2+}-exchanged montmorillonites, on kaolinite, and on silica gel was also examined in less detail; qualitatively, the conversion of trichloroethylene to dichloroacetic acid in a 48-h period occurred with the following order of decreasing efficiencies: Zn{sup 2+}-montmorillonite > silica gel > kaolinite > Ca{sup 2+}-montmorillonite > whole soil > Cu{sup 2+}-montmorillonite. These results show that the photoinduced decomposition of adsorbed trichloroethylene occurs on a variety of adsorbents, generating products and intermediates that are similar to what havemore »« less

Authors:

Tao, T; Yang, J J; Maciel, G E ^[1]

Colorado State Univ., Fort Collins, CO (United States). Dept. of Chemistry

Publication Date:: Fri Jan 01 00:00:00 EST 1999

Sponsoring Org.:: USDOE, Washington, DC (United States)

OSTI Identifier:: 298237

DOE Contract Number:: FG03-95ER14558

Resource Type:: Journal Article

Journal Name:: Environmental Science and Technology

Additional Journal Information:: Journal Volume: 33; Journal Issue: 1; Other Information: PBD: 1 Jan 1999

Country of Publication:: United States

Language:: English

Subject:: 54 ENVIRONMENTAL SCIENCES; ENVIRONMENTAL TRANSPORT; SOILS; CHLORINATED ALIPHATIC HYDROCARBONS; PHOTOCHEMICAL REACTIONS; AIR-BIOSPHERE INTERACTIONS; CARBON DIOXIDE; SOIL CHEMISTRY

Citation Formats


                    Tao, T, Yang, J J, and Maciel, G E. Photoinduced decomposition of trichloroethylene in soil components.  United States: N. p., 1999. 
        Web.  doi:10.1021/es980435a.

Copy to clipboard


                    Tao, T, Yang, J J, & Maciel, G E. Photoinduced decomposition of trichloroethylene in soil components.  United States.  https://doi.org/10.1021/es980435a

Copy to clipboard


                    Tao, T, Yang, J J, and Maciel, G E. 1999.  
        "Photoinduced decomposition of trichloroethylene in soil components".  United States.  https://doi.org/10.1021/es980435a.

Copy to clipboard


                    
@article{osti_298237,

  title        = {Photoinduced decomposition of trichloroethylene in soil components},

  author       = {Tao, T and Yang, J J and Maciel, G E},

  abstractNote = {The photoinduced decomposition of trichloroethylene adsorbed on Ca-montmorillonite by long-wavelength UV irradiation has been studied in a quartz tube open to air or through which air or oxygen is passed. Solid-sample and liquid-solution NMR techniques were used to identify apparent products or intermediates of the photodecomposition. Dichloroacetic acid was identified as a major organic product/intermediate; substantial amounts of pentachloroethane and trichloroacetic acid were also identified. The formation of CO{sub 2} was characterized quantitatively by wet chemical analysis. About 40% and 57%, respectively, of the total carbon of trichloroethylene was converted to carbon dioxide in air and O{sub 2} environments over a period of 16 days. Phosgene and HCl were also detected. The photodecomposition of trichloroethylene adsorbed on whole soil, on Zn{sup 2+}-exchanged and Cu{sup 2+}-exchanged montmorillonites, on kaolinite, and on silica gel was also examined in less detail; qualitatively, the conversion of trichloroethylene to dichloroacetic acid in a 48-h period occurred with the following order of decreasing efficiencies: Zn{sup 2+}-montmorillonite > silica gel > kaolinite > Ca{sup 2+}-montmorillonite > whole soil > Cu{sup 2+}-montmorillonite. These results show that the photoinduced decomposition of adsorbed trichloroethylene occurs on a variety of adsorbents, generating products and intermediates that are similar to what have been reported previously for TiO{sub 2}-based photodecomposition but with much longer time scales. These conversions can, therefore, be expected to occur in sunlight at the air-soil interface.},

  doi          = {10.1021/es980435a},

  url          = {https://www.osti.gov/biblio/298237},
  journal      = {Environmental Science and Technology},
number       = 1,

  volume       = 33,

  place        = {United States},

  year         = {Fri Jan 01 00:00:00 EST 1999},

  month        = {Fri Jan 01 00:00:00 EST 1999}

}

Copy to clipboard

Journal Article:

https://doi.org/10.1021/es980435a

Other availability

Find in Google Scholar

Search WorldCat to find libraries that may hold this journal

Save / Share:

Export Metadata

Save to My Library

Similar records in OSTI.GOV collections:

Adsorption of heavy metals on soil clays

Thesis/Dissertation Puls, R

This study examined the relative affinity of the metals Cd, Ni, and Zn for the clay minerals kaolinite and montmorillonite. The influence which different mineral adsorbents and different complexing ligands in solution have on the adsorption of metal ions was assessed using the Hard-Soft Acid-Base Principle as a theoretical framework for predicting the maximum extent of adsorption and rate of adsorption. The HSAB principle is that hard bases prefer to complex hard acids and soft bases prefer to complex soft acids. The hypothesis that initiated these investigations was that the had-soft character of mineral surfaces is due to their surfacemore »« less
Local motions of organic pollutants in soil components, as studied by {sup 2}H NMR

Journal Article Xiong, J; Lock, H; Chuang, I; ... - Environmental Science and Technology

{sup 2}H NMR spectra and interpretations are presented on a series of samples, each consisting of a deuterium-labeled organic pollutant (trichloroethylene, acetone, pyridine, benzene, or ethylene glycol) adsorbed on a soil component (montmorillonite clay or humic acid). Spectra were obtained over a wide temperature range and using two values of the quadrupolar echo delay period. Computer simulations of line shapes resulting from various forms of local motion of C-{sup 2}H moieties provide useful guidelines for interpreting the experimental results. In a few cases, detailed line shape simulations are given. This approach is attractive for elucidation of the detailed motional behaviorsmore »« less
https://doi.org/10.1021/es981221w
Movement and persistence of methanearsonates in soil

Journal Article Dickens, R; Hiltbold, A - Weeds; (United States)

Experiments were conducted to determine adsorption of methanearsonate by soils, soil separates, and reference clay minerals from solutions of disodium methanearsonate (DSMA), effects of soil type and pH on the leaching of surface-applied DSMA, and effects of soil type and added organic matter on the oxidation of the methyl carbon of methanearsonate. Adsorption of methanearsonate by kaolinite and vermiculite increased with increasing concentration of DSMA in the equilibrium solution. Kaolinite and limonite adsorbed much more methanearsonate than vermiculite and montmorillonite. The clay fraction of Augusta silt loam adsorbed more methanearsonate than did the sand and silt fractions. Adsorption by wholemore »« less
https://doi.org/10.2307/4040993
Sorption of cadmium, nickel, and zinc by kaolinite and montmorillonite suspensions

Journal Article Puls, R; Bohn, H

Sorption is the predominant process governing metal ion movement in soils and includes the following physical and chemical mechanisms: adsorption, precipitation and absorption. This research attempts to use the hard-soft-acid-base principle to explain sorption selectivity of the metal cations Cd, Ni, and Zn by kaolinite and montmorillonite clays. The hard-soft character of the clay surfaces, which is due to their surface functional groups, may be inferred by cation sorption selectivity experiments where pH and complex ion formation are controlled and monitored. Calcium saturated clays were suspended in Ca(ClO{sub 4}){sub 2}, CaCl{sub 2} or CaSO{sub 4} and spikes of the abovemore »« less
Adsorption of heavy metals by silicon and aluminum oxide surfaces on clay minerals

Journal Article Schulthess, C; Huang, C

The pH value of an adsorption edge (i.e., the pH value where a change occurs in the amount of aqueous ions adsorbed by a solid phase) is dependent on the surface-metal bonding strength and, consequently, on the type of adsorption site involved. The metal-adsorption sites of natural (untreated) kaolinite, montmorillonite, and synthetic mordenite were elucidated by comparing the pH values of their adsorption edges with those of Si and Al oxides. Cation adsorption by these clays is strongly influenced by the Si/Al surface site ratio, steric effects of interlayers or channels, Lewis acid strength of the metal, and pH ofmore »« less
https://doi.org/10.2136/sssaj1990.03615995005400030008x

Similar Records