Effect of Anions on Morphology Control of Brushite Particles

Hamai, Ryo; Toshima, Takeshi; Tafu, Masamoto; Masutani, Takaaki; Chohji, Tetsuji

doi:10.4028/www.scientific.net/kem.529-530.55

Cited by 15 publications

(19 citation statements)

References 9 publications

(10 reference statements)

Supporting

Mentioning

Contrasting

Order By: Relevance

“…The minor changes in the particle size of DCPD after reacting with fluoride was a result of the characteristics of this heterogeneous reaction. In a previous study, we developed a method for controlling the particle shape of DCPD by addition of acetic acid [10] …”

Section: Resultsmentioning

confidence: 99%

Properties of sludge generated by the treatment of fluoride-containing wastewater with dicalcium phosphate dihydrate

Tafu

Arioka

Takamatsu

et al. 2016

Euro-Mediterr J Environ Integr

Self Cite

View full text Add to dashboard Cite

Fluoride-containing wastewater is discharged from various industrial sites, including semiconductor, plating, and metal-treatment plants. To remove the fluoride, we treated wastewater with dicalcium phosphate dihydrate (DCPD, CaHPO 4 Á2H 2 O) to form fluorapatite [Ca 10 (PO 4 ) 6 F 2 ] crystals. We investigated the fluoride removal efficiency and the properties of the resulting sludge. For comparison, we also treated wastewater using conventional aluminum coprecipitation. The DCPD used in this study was a by-product of the gelatin industry. Nanoscale precursor particles were induced on the DCPD by treatment with warm water. After treatment of fluoridecontaining wastewater in batch experiments, the amount, particle size distribution, settleability, and filterability of the resulting sludge were measured to assess the usability of DCPD. We found that the amount of chemical additives required for the DCPD method was less than that for the conventional method. Additionally, the amount of sludge produced using the DCPD method was small and the final fluoride concentration was below 5 mg L -1 . In settleability tests, the sludge produced by the DCPD method was precipitated within 10 min. In filterability tests, most DCPD sludge was separated within 5 min. The settleability and filterability of sludge from the DCPD method were better than those of the conventional method. The release of fluoride from the DCPD sludge was below the levels stipulated by Japanese soil pollution regulations. Consequently, the sludge was considered unlikely to cause soil pollution, thereby facilitating landfill management. We concluded that DCPD can be used effectively to treat fluoride-containing wastewater and that the resulting sludge is unlikely to cause environmental damage.

show abstract

Section: Resultsmentioning

confidence: 99%

Properties of sludge generated by the treatment of fluoride-containing wastewater with dicalcium phosphate dihydrate

Tafu

Arioka

Takamatsu

et al. 2016

Euro-Mediterr J Environ Integr

Self Cite

View full text Add to dashboard Cite

show abstract

“…Coating of HA on DCPD is effective for improving reaction time of fluoride ion and maintains particle morphology of DCPD. We have appeared that morphology of DCPD particle is easily controlled by change of additives such as acetic acid [11]. If we use the characteristic-shaped DCPD and coat them with, the DCPD, in case of HA-coated DCPD, FAp seems to have grown by using calcium and phosphate ion ion, which are originated from DCPD contacted with them, and fluoride ion in the solution.…”

Section: Resultsmentioning

confidence: 99%

Effect of Hydroxyapatite on Reaction of Dicalcium Phosphate Dihydrate DCPD) and Fluoride Ion

Tafu¹,

Masutani²,

Takemura³

et al. 2013

Bioceram Dev Appl

Self Cite

View full text Add to dashboard Cite

DCPD, dicalcium phosphate dihydrate (CaHPO 4 •2H 2 O) reacts with fluoride ion in an aqueous solution, and forms fluorapatite (FAp, Ca 10 (PO 4 )6F 2 ). In previous study, we have found that DCPD does not react with fluoride ion directly, but show few hours of induction period by reaction with fluoride. In this study, effect of hydroxyapatite (HA, Ca 10 (PO 4 ) 6 (OH) 2 ) on the reactivity of DCPD with fluoride ion was investigated. By mixing HA with DCPD, it was appeared that the induction period of the reaction was shortened. Morphology of the obtained FAp was similar to HA paricles. We carried on coating of HA on the DCPD particle by soaking DCPD in simulated body fluid (SBF, Kokubo Solution). By coating HA on DCPD particles, particle morphology of the obtained FAp was consistency to the DCPD particles. These results suggest that the shape and particle size of FAp after reaction of DCPD is controllable by DCPD particle as template, and coating with HA. Effect of Hydroxyapatite on

show abstract

“…In recent studies of calcium phosphate bioceramics, various crystallization conditions (e.g., calcium and phosphorous concentrations, temperature, ionic strengths, and solution pH) were investigated [29][30][31][32][33][34][35][36]. We previously reported the effects of both acetate anion and pH on the morphology of DCPD crystallization [37]. The addition of acetate ion changed the morphology of the DCPD crystals and their yields.…”

Section: Introductionmentioning

confidence: 99%

Morphology control of brushite prepared by aqueous solution synthesis

Toshima

Hamai

Tafu

et al. 2014

Journal of Asian Ceramic Societies

View full text Add to dashboard Cite

Dicalcium phosphate dihydrate (DCPD, CaHPO 4 •2H 2 O), also known as brushite, is one of the important bioceramics due to not only diseases factors such as kidney stone and plaque formation but also purpose as fluoride insolubilization material. It is used medicinally to supply calcium, and is of interest for its unique properties in biological and pathological mineralization. It is important to control the crystal morphology of brushite since its chemical reactivity depends strongly on its surface properties; thus, its morphology is a key issue for its applications as a functional material or precursor for other bioceramics. Here, we report the effects of the initial pH and the Ca and phosphate ion concentrations on the morphology of DCPD particles during aqueous solution synthesis. Crystal morphologies were analyzed by scanning electron microscopy and X-ray diffraction. The morphology phase diagram of DCPD crystallization revealed that increasing the initial pH and/or ion concentration transformed DCPD morphology from petal-like into plate-like structures.

show abstract

Effect of Anions on Morphology Control of Brushite Particles

Cited by 15 publications

References 9 publications

Properties of sludge generated by the treatment of fluoride-containing wastewater with dicalcium phosphate dihydrate

Properties of sludge generated by the treatment of fluoride-containing wastewater with dicalcium phosphate dihydrate

Effect of Hydroxyapatite on Reaction of Dicalcium Phosphate Dihydrate DCPD) and Fluoride Ion

Morphology control of brushite prepared by aqueous solution synthesis

Contact Info

Product

Resources

About