A platform for research: civil engineering, architecture and urbanism
A platform for research: civil engineering, architecture and urbanism
Cements obtained from rice hull: Encapsulation of heavy metals
Rice hull is an agricultural residue containing organic materials (carbohydrates, cellulose, etc.) and about 10% of silica, as inorganic component. Usually rice hull is burned at the fields generating small silica particles that may cause respiratory and environmental damage. On the other hand, beta-Ca2SiO4 is the second most important component of commercial portland cement. The utilization of beta-Ca2SiO4 brings many environmental benefits, such as reduction of carbon dioxide emissions and the saving of raw materials and energy. This work describes the synthesis of beta-Ca2SiO4 and related cements prepared from rice hull and the insertion of heavy metals (copper and cadmium). The insertion of these metals, chemically bounded to dicalcium silicate may represent a useful method to permanent encapsulation of hazardous chemicals. Silica was obtained from burning rice hull at 600 deg C. The synthesis was carried out by a combination of sonochemical and solid-state chemical reactions and is completed at 800 deg C. It was found that copper and cadmium can be inserted into beta-Ca2SiO4 structure in proportions up to 10%.
Cements obtained from rice hull: Encapsulation of heavy metals
Rice hull is an agricultural residue containing organic materials (carbohydrates, cellulose, etc.) and about 10% of silica, as inorganic component. Usually rice hull is burned at the fields generating small silica particles that may cause respiratory and environmental damage. On the other hand, beta-Ca2SiO4 is the second most important component of commercial portland cement. The utilization of beta-Ca2SiO4 brings many environmental benefits, such as reduction of carbon dioxide emissions and the saving of raw materials and energy. This work describes the synthesis of beta-Ca2SiO4 and related cements prepared from rice hull and the insertion of heavy metals (copper and cadmium). The insertion of these metals, chemically bounded to dicalcium silicate may represent a useful method to permanent encapsulation of hazardous chemicals. Silica was obtained from burning rice hull at 600 deg C. The synthesis was carried out by a combination of sonochemical and solid-state chemical reactions and is completed at 800 deg C. It was found that copper and cadmium can be inserted into beta-Ca2SiO4 structure in proportions up to 10%.
Cements obtained from rice hull: Encapsulation of heavy metals
Romano, Jonatas Silva (author) / Rodrigues, Flavio Aparecido (author)
Journal of Hazardous Materials ; 154 ; 1075-1080
2008
6 Seiten, 9 Bilder, 1 Tabelle, 33 Quellen
Article (Journal)
English
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