Effects of technical adsorbents and cleaning agents in a cement matrix - A case study

• The effects of organic cleaning agents (totally three) and degradation products from solid technical adsorbents (two) on the sorption of Eu on cement and TiO2 were measured with variation of concentration (0.001-10% of the water phase for the cleaning agents, alkaline degradation products corresponding to 0.03-8 mM DOC for the adsorbents) and reaction time (up to 420 d). The effects of the cleaning agents Industrikombi and Prefect Citron were minor. The degradation of the ion exchanger (metaacrylic polymer) had no significant effect on the Eu-sorption. The other adsorbent (filter aid, inert fibre; acrylonitrile polymer) was rapidly degrading at high pH, and the degradation products had a significant reducing effect on the sorption of Eu at added DOC-levels in the mM-range. This category of adsorbent materials should not be incorporated in a cement waste matrix or be stored in a cementitious environment together with radionuclides.

Ämnesord

TEKNIK OCH TEKNOLOGIER  -- Materialteknik (hsv//swe)

ENGINEERING AND TECHNOLOGY  -- Materials Engineering (hsv//eng)

Nyckelord

Adsorbents

Cleaning

Degradation

Europium

Organic ion exchangers

pH effects

Radioactive waste disposal

Reaction kinetics

Titanium dioxide

Alkaline degradation products

Cement matrix

Molecular organics

Organic cleaning agents

Cement additives

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