Morphology control of brushite prepared by aqueous solution synthesis

Toshima, Takeshi; Hamai, Ryo; Tafu, Masamoto; Takemura, Yuka; S, Fujita; Chohji, Tetsuji; Tanda, Satoshi; Li, S.; Qin, Guimian

doi:10.1016/j.jascer.2014.01.004

Cited by 76 publications

(43 citation statements)

References 36 publications

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“…the pH and reactant concentrations in a simplified aqueous solution process [29]. Consequently, the particle size and filterability of the sludge resulting from wastewater treatment with DCPD can likely be controlled by adjusting the morphology of DCPD during its manufacture.…”

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

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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.

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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

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“…In a subsequent step, crystal structure refinement has been performed. Indexation of the powder XRD data was confirmed for the unsubstituted brushite using the auto indexing program DIC VOL implemented in the FullProf program [43] as described in the experimental section. The present compound was confirmed to be single phased, all peaks being identified in the monoclinic struc ture of brushite.…”

Section: Unsubstituted Brushite Cahpo 4 2h 2 Omentioning

confidence: 99%

Brushite (Ca,M)HPO4, 2H2O doping with bioactive ions (M = Mg2+, Sr2+, Zn2+, Cu2+, and Ag+): a new path to functional biomaterials?

Sayahi

Santos

Elfeki

et al. 2020

Materials Today Chemistry

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Ion substitution Human stem cells Bone biomaterial Calcium phosphate Dicalcium phosphate dihydrate, DCPD (CaHP0 4 •2H 2 O), brushite, is an important calcium phosphate compound encountered in mineralized tissues and used in medicine, especially in bone cernent for mulations. However, the use of DCPD as direct implantable biomaterial has not received dedicated attention. In addition, the possibility to dope DCPD with biologically active ions to modulate its per formances was not systematically explored. We have investigated in depth the doping of DCPD with Mg 2+ , sr2 + , Zn 2+ , Cu 2+ , and Ag + ions. Clear modifications in terms of chemical composition, particl e size, pore distribution, crystal morphology, and affinity for water were pointed out. Then, the samples were cultured with human adipose derived stem cells to explore cytotoxicity and proliferation. Various be haviors were noticed dependent on the incorporated metal ions. Such DCPD compounds associated with bioactive metal ions, and particularly Ag + and Zn 2+ , appear promising as a new family of reactive ma terials for use, as such or in combination, in bone related applications.

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“…3) Research on controlling the morphology of DCPD particles has relevance for the aforementioned purposes, because their chemical reactivity and physical properties are determined by their surface condition, size, and shape. 4) In the case of solution synthesis, both Miller et al 5) and our group reported effective parameters for controlling the morphology of DCPD particles; examples include the initial pH value and concentration, 6) coexistence ions 7) and mixing process. 8) Modification of these parameters makes it possible to control the morphology of DCPD particles in terms of the tabular and petaloid shapes.…”

Section: Introductionmentioning

confidence: 91%

Improving the properties of dicalcium phosphate dihydrate (DCPD) powder by changing the morphology

Toshima

Sato

Takamatsu

et al. 2018

J. Ceram. Soc. Japan

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Dicalcium phosphate dihydrate (DCPD, CaHPO 4 •2H 2 O) has attracted attention as an environmental material recently because it reacts selectively with fluoride ions and transforms them into the highly stable, non-toxic material fluoroapatite [FAp, Ca 10 (PO 4) 6 F 2 ]. During this chemical reaction, the FAp particles retain their approximate shapes; in other words, DCPD particles act as templates for FAp particles. Our previous studies showed that the morphology of DCPD particles with tabular and petaloid shapes is controllable by use of a crystallization parameter under conditions of solution synthesis. DCPD has various applications, such as treatment of wastewater and polluted soil. Materials used for environmental purposes require not only appropriate chemical reactivity but also various powder properties to make them usable under various conditions. Thus, in this study, we compared the typical powder properties (bulk and tap densities, compressibility, Carr's flowability index, sedimentation rate, and permeability) of the different morphologies of DCPD in terms of their suitability for environmental applications. The obtained results show that petaloid-shaped particles offer superior usability as compared to tabular-shaped particles.

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Morphology control of brushite prepared by aqueous solution synthesis

Cited by 76 publications

References 36 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

Brushite (Ca,M)HPO4, 2H2O doping with bioactive ions (M = Mg2+, Sr2+, Zn2+, Cu2+, and Ag+): a new path to functional biomaterials?

Improving the properties of dicalcium phosphate dihydrate (DCPD) powder by changing the morphology

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