2015-Sustainable Industrial Processing Summit
SIPS 2015 Volume 9: Physics, Advanced Materials, Multifunctional Materials
| Editors: | Kongoli F, Dubois JM, Gaudry E, Fournee V, Marquis F |
| Publisher: | Flogen Star OUTREACH |
| Publication Year: | 2015 |
| Pages: | 275 pages |
| ISBN: | 978-1-987820-32-4 |
| ISSN: | 2291-1227 (Metals and Materials Processing in a Clean Environment Series) |
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Variations for Multifunctional Composites - A Material Family for Solutions of Problems after DDT (Mosquito Killing) and Decontamination of Radioactive Solutions
Laszlo Kotai1;1RESEARCH CENTRE FOR NATURAL SCIENCES, HUNGARIAN ACADEMY OF SCIENCES, Budapest, Hungary;
Type of Paper: Regular
Id Paper: 354
Topic: 22
Abstract:
Composites produced from porous foamed volcanic glass and special binders provide us useful materials with different properties and wide variations of application fields. Depending on the nature of the binder, composite properties can be controlled and in this way, magic materials can be manufactured with unusual and unexpected properties, for example, as carriers for controlled releasing of special ingredients (e.g. selective biological mosquito-larvae killing agent) or for encapsulation of harmful materials containing radioactive isotopes (e.g. for treatment of large amount of aqueous waste with low radioactive isotope content).
Using a starch-protein mixture binder (made from wheat flour) and foamed pumicite, a porous composite material is prepared which contains opened and closed pores and thus can be used as carrier material for BTI (Bacillus Thueringiensis Israelensis), a special and selective biological mosquito-larvae killing agent. Mosquito-larvas, in general, live and feed on the water surface of muddy areas. Our carrier material can float on water surface until it is loaded with BTI and releases the active ingredient in 24-28 hours, which is long enough to kill larvas. An important property of the carrier material is that it sinks in water after releasing BTI and decomposes into harmless natural materials.
Using hydraulic binders and pumicite, a "solid sponge" with opened pores is produced. The surface of the composite usually presents a column-like shape. This material can absorb waste water. The water (solvent) can be evaporated on the surface of the composite and thus the solid non-volatile impurities, e.g. isotopes, are kept in the pores. The evaporation can be done by natural evaporation accelerated by air stream or may also be done in a closed system with external heating. The intensity of evaporation is proportional to the free surface area of the composite column (in case of column). The isotope waste filled columns can be treated in processes like cement or glass forming to ensure final deposition.