Synthesis of calcium phosphate hydrogel from waste incineration fly ash and bone powder.
Waste incineration fly ash and bone powder could be successfully recycled into calcium phosphate hydrogel, a type of fast proton conductor. Various properties of the intermediate and calcium phosphate hydrogel from them were characterized and compared with that from calcium carbonate reagent. It was found that the intermediate from the incineration fly ash and calcium phosphate glass was more brittle than that from bone powder and calcium carbonate reagent. The electric conductivity of crystallized hydrogel obtained from all raw materials increases exponentially with temperature. However, the crystallized hydrogel from incineration fly ash has lower electric conductivity and lower crystallinity than that from bone powder and the reagent. Moreover, the difference in electric conductivity between these crystallized hydrogels decreases with temperature. Compared with using the reagent as a raw material, bone powder provides a 25% reduction in the usage of H(3)PO(4) to acquire the crystallized hydrogel which has the highest conductivity. These experimental results suggest that the incineration fly ash and bone powder are useful calcium sources for the synthesis of calcium phosphate hydrogel.
Fukui
Kunihiro
K
Department of Chemical Engineering, Graduate School of Engineering, Hiroshima University, Higashi-Hiroshima 739-8527, Japan. kfukui@hiroshima-u.ac.jp
Arimitsu
Naoki
N
Kidoguchi
Satoshi
S
Yamamoto
Tetsuya
T
Yoshida
Hideto
H
D000818:Animals; D001842:Bone and Bones / Q000737:chemistry*; D002130:Calcium Phosphates / Q000138:chemical synthesis* / Q000737:chemistry; D002244:Carbon / Q000737:chemistry*; D002645:Chickens; D060729:Coal Ash; D020136:Hydrogel, Polyethylene Glycol Dimethacrylate / Q000138:chemical synthesis* / Q000737:chemistry; D017745:Incineration; D015394:Molecular Structure; D052638:Particulate Matter / Q000737:chemistry*; D014961:X-Ray Diffraction
D002130:Calcium Phosphates; D060729:Coal Ash; D052638:Particulate Matter; D020136:Hydrogel, Polyethylene Glycol Dimethacrylate; D002244:Carbon; C020243:calcium phosphate