Title

Kinetic Studies Of Nano-Scale And Micro-Scale Zero Valent Iron Emulsions

Abstract

Nano-scale and micro-scale iron were tested for their efficiency in dehalogenating dense non-aqueous phase liquids (DNAPL) (trichloroethylene, TCE) and its ability to challenge the DNAPL (TCE) pool. The by-products of the dehydrogenation reaction, primarily ethylene, diffused out of the emulsion droplet. Ethylene production proved that the DNAPL has sorbed into the emulsion droplet where the dehalogenation reactions take place. Ethylene had a lower solubility than water allowing the gaseous compound to exit through the droplet wall and into the headspace. By comparing the rates of ethylene production in emulsions made with nano-scale iron or micro-scale iron, it could be shown which type of iron would yield a more reactive emulsion. Nano-scale iron emulsions degraded TCE more effectively than micro-scale iron emulsions. Headspace kinetic studies showed the rate of ethylene production in most nano-scale iron emulsions is significantly larger than the production rate in micro-scale iron emulsions. Emulsions mixed with Span 85 expressed this phenomenon most effectively. Degradation kinetics also prove emulsions dehalogenated DNAPL TCE more effectively than nano Fe alone. This is an abstract of a paper presented at the 223rd ACS National Meeting (Orlando, FL 4/7-11/2002).

Publication Date

12-1-2002

Publication Title

ACS Division of Environmental Chemistry, Preprints

Volume

42

Issue

1

Number of Pages

62-66

Document Type

Article; Proceedings Paper

Personal Identifier

scopus

Socpus ID

23844521309 (Scopus)

Source API URL

https://api.elsevier.com/content/abstract/scopus_id/23844521309

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