Pb&lt;SUP&gt;2+&lt;/SUP&gt; ION REMOVAL ABILITY OF HYDROXYAPATITE

Nakagawa, Souhei; Kaji, Fumihiro; Yamagami, Toshihiro; Sakurai, Makoto; Watanabe, Makoto

doi:10.3363/prb1992.14.0_119

Cited by 10 publications

(12 citation statements)

References 2 publications

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“…However, the peaks of HAP-400-Pb seem sharper than those of HAP-300-Pb. As reported previously, 13 the reaction mechanisms for Pb are different between the cases of HAP-300 and HAP-400. The former involves only substitution of Ca 2+ with Pb…”

Section: ) Pb (Ii)-and Fe (Iii)-bearing Hydroxyapatitesmentioning

confidence: 50%

“…The removal proceeds by elution of Ca and formation of lead apatite. 13 However, reactivity of HAP-400 with the other heavy metals has not been reported so far. Therefore, we investigated reaction of HAP-400 with heavy metals, Fe (III), Fe (II), Cu (II), Cd (II), Cr (III), Co (II), Ni (II), and Zn (II), together with Pb (II), and elucidated the reaction mechanisms.…”

Section: Introductionmentioning

confidence: 98%

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REACTION OF Ca-DEFICIENT HYDROXYAPATITE WITH HEAVY METAL IONS ALONG WITH METAL SUBSTITUTION

Moriguchi

Nakagawa

Kaji

2008

Phosphorus Research Bulletin

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Reaction of Ca-deficient hydroxyapatite, HAP-400, with heavy metals, Pb (II), Fe (III), Fe (II), Cu (II), Cd (II), Cr (II), Co (II), Ni (II), and Zn (II) was investigated at 25˚C for 4 h in water, compared with stoichiometric hydroxyapatite HAP-300. From heavy metal consumption and [Ca]/[Metal], which is defined by molar ratio of eluted Ca and consumed heavy metal, the reactions of HAP-400 with the heavy metals except for Pb (II) and Fe (III) proceed via metal-adsorptive substitution mechanism. In the reactions of HAP-400 with Pb (II) and Fe (III), the metals were completely consumed with equivalent elution of Ca, but these reactions proceeded by no simple substitution mechanism to afford Pb (II)-and Fe (III)-bearing HAP-400 with specific structures, namely HAP-400-Pb and HAP-400-Fe.By XRD and FT-IR microspectroscopy, it was found that HAP-400-Pb is constituted of both newly formed lead apatite crystal and the original apatite crystal, and that HAP-400-Fe is constituted of much amorphous FePO 4 phase around the original apatic phase. Therefore, it was concluded that the reactions of HAP-400 with Pb (II) and Fe (III) proceed by the following mechanism: erosion of the apatic structure and formation of a brand-new structure containing metal. This mechanism can be named apatite-erosive substitution mechanism.

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Section: ) Pb (Ii)-and Fe (Iii)-bearing Hydroxyapatitesmentioning

confidence: 50%

Section: Introductionmentioning

confidence: 98%

REACTION OF Ca-DEFICIENT HYDROXYAPATITE WITH HEAVY METAL IONS ALONG WITH METAL SUBSTITUTION

Moriguchi

Nakagawa

Kaji

2008

Phosphorus Research Bulletin

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“…Hydroxyapatites, HAP-100, HAP-200, HAP-300, and HAP-400, 22,23 were supplied from Taihei Chemical Industrial Co., Ltd.…”

Section: Methodsmentioning

confidence: 99%

“…Therefore, we investigated photo-Fenton reaction of ATZ with Fe(III)-treated hydroxyapatites prepared from hydroxyapatites, HAP-100, HAP-200, HAP-300, and HAP-400, with different crystal morphologies and Ca/P ratios (referred to 2.1) [20][21][22][23] followed by control investigations using other Fe(III) compounds (Fe2O3, FePO4, FeOOH) as catalysts and ARS as a substrate. In addition, liquid chromatography-mass spectroscopy analysis (LC-MS) of the resulting solution in the reaction of ATZ was carried out to elucidate and indentify oxidative degradation products.…”

Section: Introductionmentioning

confidence: 99%

HETEROGENEOUS PHOTO-FENTON REACTION OF A HERBICIDE ATRAZINE BY USING Fe(III)-TREATED HYDROXYAPATITES

Moriguchi

Sakamoto

Nakagawa

2013

Phosphorus Research Bulletin

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“…The morphology of the resulting particle reveals plate-shape. 15) In addition to the three kinds of HAp powders, spherical HAp powders are synthesized via a spray-dry method, this powders is composed of spherical agglomerates of needle-shaped microcrystals with the sizes of 0.2-0.3 mm. 14) In the present study, we prepared four kinds of IP6/HAp powders using commercially-available HAp powders with diferent morphology and specific surface area (SSA): HAp-100 (fine particle, 33-37 m 2 ･g -1 ), HAp-200 (hexagonal shape, 1-2 m 2 ･g -1 ), HAp-400 (plate shape, 37 m 2 ･g -1 ), and s-HAp (spherical shape, 45 m 2 ･g -1 ).…”

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confidence: 99%

Fabrication of chelate-setting hydroxyapatite cements from four kinds of commercially-available powder with various shape and crystallinity and their mechanical property

Horiguchi

Yoshikawa

Oribe

et al. 2008

J. Ceram. Soc. Japan

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Hydroxyapatite (Ca 10 (PO 4 ) 6 (OH) 2 ; HAp) is one of inorganic components of bone and teeth, and has an osteoconductivity and execellent biocompatibility. Thus, the HAp has been used as biomaterials for bone graftings. Clinically-used HAp cements are set on the basis of the acid-base reaction of Ca 4 O(PO 4 ) 2 and CaHPO 4 . This mechanism accompany the changes of pH during hardening, leading to inflammation around tissues, together with slow setting time. We have succeeded to develop novel HAp cement, which is created by mixing the HAp powder modified with inositol phosphate (IP6) and water. The present IP6-HAp cement is set based on the chelate-bonding of IP6 without the acid-base reaction. The IP6 is not only biocompatible but also has able to chelate to some metal ions as strongly as EDTA. In the present study, we fabricated four kinds of IP6-HAp cements using commercially-available HAp powders with diferent morphology and specific surface area (SSA): HAp-100 (fine particle), HAp-200 (hexagonal shape), HAp-400 (plate shape), and s-HAp (spherical shape). Among the cement specimens examined, the IP6/HAp-100 cement derived from HAp-100 powder had maximum compressive strength of 10 MPa under following condition: Powder/Liquid (P/L) ratio＝1/0.45[w/w]. The HAp-100 powder was composed of microcrystals with the highest SSA of 62.4 m 2 ･g -1 among the HAp powder used in the present work. On the other hand, the compressive strength of the IP6/HAp-200 cements showed the lowest value of 2 MPa under following condition: P/L ratio＝1/0.35[w/w]. The HAp-200 powder of a starting material was composed of hexagonal-shaped crystals, and had the lowest SSA of 7.0 m 2 ･g -1 . These results indicate that the compressive strength of novel IP6/HAp cements was affected by powder properties, especially, the morphology and SSA of starting HAp powders.

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Pb<SUP>2+</SUP> ION REMOVAL ABILITY OF HYDROXYAPATITE

Cited by 10 publications

References 2 publications

REACTION OF Ca-DEFICIENT HYDROXYAPATITE WITH HEAVY METAL IONS ALONG WITH METAL SUBSTITUTION

REACTION OF Ca-DEFICIENT HYDROXYAPATITE WITH HEAVY METAL IONS ALONG WITH METAL SUBSTITUTION

HETEROGENEOUS PHOTO-FENTON REACTION OF A HERBICIDE ATRAZINE BY USING Fe(III)-TREATED HYDROXYAPATITES

Fabrication of chelate-setting hydroxyapatite cements from four kinds of commercially-available powder with various shape and crystallinity and their mechanical property

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