Abiotic and Biological Transformation of Tetraalkoxysilanes and Trichloroethene/cis-1,2-Dichloroethene Cometabolism Driven by Tetrabutoxysilane-Degrading Microorganisms

Autor:	Rolf U. Halden, James D. Ingle, Lewis Semprini, Sanjay Vancheeswaran, Kenneth J. Williamson
Rok vydání:	1999
Předmět:	Abiotic component Inorganic chemistry Cometabolism General Chemistry Biodegradation Mineralization (biology) Chemical reaction chemistry.chemical_compound Hydrolysis chemistry Environmental chemistry Environmental Chemistry Silicic acid Solubility
Zdroj:	Environmental Science & Technology. 33:1077-1085
ISSN:	1520-5851 0013-936X
DOI:	10.1021/es981021k
Popis:	Attenuation of silicon-based organic compounds (tetraalkoxysilanes) by abiotic hydrolysis and biological mineralization was investigated. At Lawrence Livermore National Laboratory site 300, tetraalkoxysilanes are present along with trichloroethene (TCE) as subsurface contaminants. Under abiotic conditions, the alkoxysilanes such as tetrabutoxysilane (TBOS) and tetrakis(2-ethylbutoxy)silane (TKEBS) hydrolyze to 1-butanol and 2-ethylbutanol, respectively, and silicic acid. The rates of hydrolysis of TBOS and TKEBS were determined to evaluate the significance of the hydrolysis reaction in the attenuation process, and typical rates at pH 7, 30 °C, and 28 μmol/L initial concentration were 0.32 and 0.048 μmol/L/day, respectively. The TBOS hydrolysis reaction was observed to be acid- and base-catalyzed and independent of temperature from 15 to 30 °C. All hydrolysis experiments were conducted at concentrations above the solubility limit of TBOS and TKEBS, and the rate of hydrolysis increased with concentration of...
Databáze:	OpenAIRE
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