Microstructure and leaching behavior of polymer composites for encapsulating toxic solid wastes

Felipe Rengifo, Avelino E Saez, Wendell P Ela, Anh Quach, Bryce Garbo, Carrie Franks, Brian J J Zelinski, Dunbar P. Birnie, Harry D. Smith, Gary L. Smith

Research output: Contribution to journalArticle

2 Citations (Scopus)

Abstract

This work presents a water-based process for the manufacture of a polymeric waste form for the encapsulation of soluble toxic salts. The process is based on the elaboration of an aqueous emulsion in which polymeric precursors are mixed with the waste. Upon drying and curing, the emulsion inverts to form a waste form with mechanical integrity that stabilizes the toxic salt. The final polymer matrix is a mixture of an epoxy resin and poly(styrene butadiene) (PSB). Sodium nitrate was used as a model salt waste. The microstructure and composition of the samples were examined using scanning electron microscopy, osmium tetroxide staining, and salt extraction. The results show that the epoxy resin is dispersed in a continuous PSB phase, and the encapsulated salt is distributed throughout the matrix. Leaching tests were carried out by exposing sections of the waste forms to large volumes of well-stirred water. The measured time dependence of the leaching process is described quantitatively by a model based on the diffusion of the salt through the waste form. Effective diffusivities of the salt in the polymeric matrix ranged between 10-8 and 10-7 cm2/s. The results suggest that diffusion occurs through limited but significant continuous porosity.

Original languageEnglish (US)
Pages (from-to)7492-7499
Number of pages8
JournalIndustrial and Engineering Chemistry Research
Volume43
Issue number23
StatePublished - Nov 10 2004

Fingerprint

Poisons
Solid wastes
solid waste
Leaching
microstructure
Polymers
polymer
Salts
leaching
salt
Microstructure
Composite materials
Epoxy Resins
emulsion
Emulsions
Epoxy resins
matrix
resin
Osmium Tetroxide
osmium

ASJC Scopus subject areas

  • Polymers and Plastics
  • Environmental Science(all)
  • Chemical Engineering (miscellaneous)

Cite this

Microstructure and leaching behavior of polymer composites for encapsulating toxic solid wastes. / Rengifo, Felipe; Saez, Avelino E; Ela, Wendell P; Quach, Anh; Garbo, Bryce; Franks, Carrie; Zelinski, Brian J J; Birnie, Dunbar P.; Smith, Harry D.; Smith, Gary L.

In: Industrial and Engineering Chemistry Research, Vol. 43, No. 23, 10.11.2004, p. 7492-7499.

Research output: Contribution to journalArticle

Rengifo, F, Saez, AE, Ela, WP, Quach, A, Garbo, B, Franks, C, Zelinski, BJJ, Birnie, DP, Smith, HD & Smith, GL 2004, 'Microstructure and leaching behavior of polymer composites for encapsulating toxic solid wastes', Industrial and Engineering Chemistry Research, vol. 43, no. 23, pp. 7492-7499.
Rengifo, Felipe ; Saez, Avelino E ; Ela, Wendell P ; Quach, Anh ; Garbo, Bryce ; Franks, Carrie ; Zelinski, Brian J J ; Birnie, Dunbar P. ; Smith, Harry D. ; Smith, Gary L. / Microstructure and leaching behavior of polymer composites for encapsulating toxic solid wastes. In: Industrial and Engineering Chemistry Research. 2004 ; Vol. 43, No. 23. pp. 7492-7499.
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