Effects of Pretreatments on Calcium Phosphate Hydrogel Synthesis from Waste Incineration Fly Ash

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

doi:10.4164/sptj.45.684

Cited by 3 publications

(5 citation statements)

References 8 publications

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“…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: 92%

“…Based on our previous paper [17], the additive volume of phosphoric acid was optimized (incineration fly ash and CaCO 3 reagent: 6.8 cm 3 , bone powder: 5.1 cm 3 ). The batch mixture was melted in air at 1200 • C for 30 min and it was poured onto an iron plate.…”

Section: Preparation and Characterization Of Calcium Phosphate Hydrogelmentioning

confidence: 99%

“…Our previous paper [17] has reported the characterization of the electric conductivity of calcium phosphate hydrogel obtained from incineration fly ash and chicken bone powder in the temperature range of 15-70 • C. The present study deals with the determination of the fuel cell performance for calcium phosphate hydrogel membrane prepared from incineration fly ash and chicken bone powder. Further, the electric conductivity and fuel cell performance are compared with those of calcium phosphate hydrogel synthesized from pure reagents in the temperature range of 15-130 • C. …”

Section: Introductionmentioning

confidence: 98%

“…As a new effective method for reusing them, we have proposed the synthesis of calcium phosphate hydrogel from incineration fly ash and chicken bone powder [16,17]. Our previous paper [17] has reported the characterization of the electric conductivity of calcium phosphate hydrogel obtained from incineration fly ash and chicken bone powder in the temperature range of 15-70 • C. The present study deals with the determination of the fuel cell performance for calcium phosphate hydrogel membrane prepared from incineration fly ash and chicken bone powder.…”

Section: Introductionmentioning

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 Hydrogelmentioning

confidence: 92%

Section: Preparation and Characterization Of Calcium Phosphate Hydrogelmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 98%

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

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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“…In other words, calcium phosphate hydrogel retains water between long-chain phosphate structures, as shown in Fig. 5 (Fukui et al, 2008b). The distance between the long chains in the structure increases with the moisture content, which corresponds to the amount of water in the hydrogel.…”

Section: Preparation Of Membrane Electrode Assembly and Determinationmentioning

confidence: 93%

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 Fast Proton Conductor from Waste Incineration Ash

Fukui

Yoshida

2007

Hosokawa Foundation ANNUAL REPORT

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Effects of Pretreatments on Calcium Phosphate Hydrogel Synthesis from Waste Incineration Fly Ash

Cited by 3 publications

References 8 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

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

Synthesis of Fast Proton Conductor from Waste Incineration Ash

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