Synthesis of calcium phosphate hydrogel from waste incineration fly ash and bone powder

Fukui, Kiichi; Arimitsu, Naoki; Kidoguchi, Satoshi; Yamamoto, Tetsuya; Yoshida, Hideto

doi:10.1016/j.jhazmat.2008.06.103

Cited by 15 publications

(10 citation statements)

References 12 publications

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“…Conductivity of crystallized calcium phosphate hydrogel as a function of temperature for various raw materials. crystallized calcium phosphate hydrogel above 80 • C. These results agree with the conductivity measured at 15-70 • C in our previous work [18]. Fig.…”

Section: Characterization Of Calcium Phosphate Hydrogelsupporting

confidence: 92%

“…The conductivity of crystallized hydrogel from bone powder almost agrees with that from CaCO 3 reagent, though a decrease in the temperature raises the difference in the conductivity between them. Further, the conductivity of them reaches a maximum at 80 • C. On the other hand, crystallized hydrogel from incineration fly ash has the lowest conductivity since potassium ion present in the incineration fly ash breaks the long-chain phosphate structures [17,18]. An increase in the temperature decreases the difference in the conductivity between the hydrogel obtained from incineration fly ash and that synthesized from other raw materials.…”

Section: Characterization Of Calcium Phosphate Hydrogelmentioning

confidence: 99%

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Performance of fuel cell using calcium phosphate hydrogel membrane prepared from waste incineration fly ash and chicken bone powder

Fukui

Arimitsu

Jikihara

et al. 2009

Journal of Hazardous Materials

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Waste incineration fly ash and bone powder could be successfully recycled to calcium phosphate hydrogel, a type of fast proton conductor. The electric conductivity of the crystallized hydrogel from them was compared with that from calcium carbonate reagent. It was found that the conductivity of the hydrogel from bone powder is almost equal to that from calcium carbonate reagent, which is higher than that from incineration fly ash. Because the crystallized hydrogel from incineration ash has a lower crystallinity than that from bone powder and calcium carbonate reagent. However, the difference of the conductivity among them can be hardly observed above 100 degrees C. The fuel cell with membrane electrode assembly (MEA) using the calcium phosphate hydrogel membrane prepared from incineration fly ash and bone powder was observed to generate electricity. The performance of fuel cells having the hydrogel membrane obtained from all raw materials increases with the cell temperature, and the fuel cell containing the hydrogel membrane from incineration fly ash has the highest dependence of the fuel cell performance. For this reason, the difference in the cell performance among them can be hardly observed above 120 degrees C. This tendency agrees with the change in the electric conductivity with the temperature. Further, the performance of all fuel cells with the hydrogel membrane is superior to that of the fuel cell with perfluorosulfonic polymer membrane at temperatures greater than approximately 85 degrees C.

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Section: Characterization Of Calcium Phosphate Hydrogelsupporting

confidence: 92%

Section: Characterization Of Calcium Phosphate Hydrogelmentioning

confidence: 99%

Performance of fuel cell using calcium phosphate hydrogel membrane prepared from waste incineration fly ash and chicken bone powder

Fukui

Arimitsu

Jikihara

et al. 2009

Journal of Hazardous Materials

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show abstract

“…1,2 In industry, there is always a need for the development of new insights in order to eliminate a variety of toxic residues that cause serious damage to the environment. [3][4][5] In both cases, the water-based materials (thus called hydrogels) can offer a wide range of explorative approaches for new targeting mechanisms 6,7 (biotechnology) and cleaning strategies 8,9 (industry). The large volume of water in the hydrogel allows solute diffusion through its porous network, 10,11 making it attractive for use in pharmaceutical formulations as drug release systems and in treatment of wastewater by absorption of residues.…”

Section: Introductionmentioning

confidence: 99%

Albumin release from a brain-resembling superabsorbent magnetic hydrogel based on starch

et al. 2012

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“…And we have also reported that using calcium phosphate hydrogel from incineration fly ash might contribute to the reduction of the cost of the fuel cell though the cost of the electrolyte occupied about 10% of the cost of the fuel cell (Fukui et al, 2009). The present study deals with the characterization of the electric conductivity of calcium phosphate hydrogel obtained from incineration fly ash and the determination of the fuel cell performance for calcium phosphate hydrogel membrane prepared from incineration fly ash.…”

Section: Introductionmentioning

confidence: 94%

Synthesis of calcium phosphate hydrogel from waste incineration fly ash and its application to fuel cell

Fukui

Kidoguchi

Arimitsu

et al. 2009

Journal of Environmental Management

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a b s t r a c tWaste incineration fly ash was successfully recycled to calcium phosphate hydrogel, a type of fast proton conductor. The crystallized hydrogel from incineration fly ash had a lower electric conductivity and a lower crystallinity than that from calcium carbonate reagent. However, the difference in electric conductivity between these crystallized hydrogels decreases with temperature. This was due to the presence of potassium in the incineration fly ash. The fuel cell with a membrane electrode assembly (MEA) using the calcium phosphate hydrogel membrane prepared from incineration fly ash was observed to generate electricity. The performance of this fuel cell was almost equal to that of a mixture of K 2 CO 3 and CaCO 3 reagents; further, the performance of the former was superior to the fuel cell with a perfluorosulfonic polymer membrane at temperatures greater than approximately 85 C.

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Synthesis of calcium phosphate hydrogel from waste incineration fly ash and bone powder

Cited by 15 publications

References 12 publications

Performance of fuel cell using calcium phosphate hydrogel membrane prepared from waste incineration fly ash and chicken bone powder

Performance of fuel cell using calcium phosphate hydrogel membrane prepared from waste incineration fly ash and chicken bone powder

Albumin release from a brain-resembling superabsorbent magnetic hydrogel based on starch

Synthesis of calcium phosphate hydrogel from waste incineration fly ash and its application to fuel cell

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