Stötzel C, Müller F A, Reinert F, Niederdraenk F, Barralet J E, Gbureck U
Department for Functional Materials in Medicine and Dentistry, University of Würzburg, Pleicherwall 2, D-97070 Würzburg, Germany.
Colloids Surf B Biointerfaces. 2009 Nov 1;74(1):91-5. doi: 10.1016/j.colsurfb.2009.06.031. Epub 2009 Jul 7.
This study aimed to correlate crystallinity of hydroxyapatite (HA) with the ion adsorption behaviour of the material. Hydroxyapatite powders of various crystallinities (X(c)) and specific surface area (SSA) were prepared by precipitation following heat treatment. Adsorption experiments were carried out by using (i) multi-component ion solutions containing a broad range of light and heavy ions to study competitive adsorption and (ii) lead and zinc solutions with concentrations up to 250 ppm to determine the adsorption isotherms of the material. While as-prepared HA powders of low crystallinity (X(c)=0%) and a high SSA of 170 m(2)/g showed quantitative removal for divalent Pb, Zn, Be, U, Bi, V, Al, Cu and Ga ions, calcined powders with higher crystallinity (X(c)=65-95%) and lower SSA between 5 and 30 m(2)/g led to a quantitative removal only for a few elements (Pb, Bi, Ga). The time and concentration dependant ion removal capacity for Pb(2+) and Zn(2+) single element solutions showed quantitative removal even after short immersion times of less than 10 min for as-prepared HA powders. XRD analysis of the powders after ion adsorption revealed the presence of pyromorphite (Pb(5)(PO(4))(3)OH) and hopeite (Zn(3)(PO(4))(2)) phases, respectively.
本研究旨在关联羟基磷灰石（HA）的结晶度与该材料的离子吸附行为。通过热处理后的沉淀法制备了具有不同结晶度（X(c)）和比表面积（SSA）的羟基磷灰石粉末。吸附实验通过以下方式进行：（i）使用包含多种轻离子和重离子的多组分离子溶液来研究竞争性吸附，以及（ii）使用浓度高达250 ppm的铅和锌溶液来确定该材料的吸附等温线。虽然制备的低结晶度（X(c)=0%）且比表面积为170 m²/g的HA粉末对二价的Pb、Zn、Be、U、Bi、V、Al、Cu和Ga离子表现出定量去除效果，但结晶度较高（X(c)=65 - 95%）且比表面积在5至30 m²/g之间的煅烧粉末仅对少数几种元素（Pb、Bi、Ga）有定量去除效果。对于Pb(2+)和Zn(2+)单元素溶液，所制备的HA粉末即使在短至不到10分钟的浸泡时间后，其与时间和浓度相关的离子去除能力也显示出定量去除效果。离子吸附后粉末的XRD分析分别揭示了磷氯铅矿（Pb(5)(PO(4))(3)OH）和磷锌矿（Zn(3)(PO(4))(2)）相的存在。
