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无机材料学报

无机材料学报

• 研究论文 • 上一篇    下一篇

纳米CHAP的替换结构及其相变、吸F-行为研究

黄志良1,2; 刘羽2; 张昱1; 魏军1; 何亚林1; 王大伟2   

  1. 1. 武汉化工学院材料科学与工程系, 武汉 430073; 2. 中南大学资源与环境学院, 长沙 410083
  • 收稿日期:2001-12-17 修回日期:2001-01-31 出版日期:2002-09-20 网络出版日期:2002-09-20

Substitution Structure, Phase Tranversion and Absorbing F- Action of the CHAP in Nanoscale

HUANG Zhi-liang1,2; WANG Da-Wei2; LIU Yu1; ZHANG Yu1; WEI Jun1; HE Ya-Lin1   

  1. 1.Department of Materials Science & Engineering; Wuhan Institute of Chemical Technology; Wuhan 430073; China; 2.Institute of Resource & Environment; South Central University; Changsha 410083
  • Received:2001-12-17 Revised:2001-01-31 Published:2002-09-20 Online:2002-09-20

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摘要： 用sol-gel法制备了不同CO32-掺量的碳羟磷灰石（CHAP）;采用FTIR、DTA、TG、XRD、TEM、晶粒密度测定、静态吸附等方法研究了CHAP的替换结构及其相变和吸F-行为.结果表明;CHAP属AB混合型替换结构;当WCO32-<3.34％时,随CO32-含量增加,RI增大,吸氟量减小,吸氟过程中有较强的优先吸附CO32-进入其晶格的能力,150～776℃脱CO32-相变为钙亏HAP,776℃时脱羟相变为TCP相;当WCO32-=3.34％时,RI达最大值,脱CO32-相变为正常配比HAP,在776℃时不发生脱羟相变;当3.34％32-≤7.52%时, 随CO32-含量增加, RI减小, 吸氟量增大, 吸氟过程中有较强的优先吸附F-进入其晶格的能力而CO32-被交换出来, 脱CO32-相变为钙盈HAP, 在776℃时不发生脱羟相变; CHAP纳米晶有沿柱长方
向的溶解行为, 比纯HAP的吸氟量大2～3倍, 表现出纳米尺度下的溶解-沉淀吸附效应.

关键词: 纳米吸附, 碳羟磷灰石, 替换结构, 相变, 吸F-行为

Abstract: The nano carbonate-containing hydroxyapatite(CHAP) with different CO32- contents (WCO32-)
was prepared by a sol-gel process. DTA, TG, XRD, FTIR, TEM,dynamic absorption test and crystalline density measurement were used to study substitution
structure, phase tranversion and absorbing F- action of the CHAP. Test results indicate that the CHAP is with AB mixed-type substitution structure.
When WCO32-<3.34%, RI increases and capacities absorbing F- decrease with the increasing of CO32- contents, and the CHAP has
preferentially a tendency of absorbing CO32- to enter its lattice in absorbing F- process, and a phase tranversion from the CHAP to Ca-deficient
HAP takes place at 150～776℃, then the HAP occurs dehydroxy phase tranversion at 776℃. When WCO32-=3.34%, RI has maximum
value, a phase tranversion from the CHAP to Ca-stoichiometric HAP takes place at 150～776℃, so the dehydroxy phase tranversion of HAP can
not occur at 776℃. When 3.34%<WCO32-≤7.52%, RI decreases and capacities absorbing F- increase with the increasing of CO32- content, and the CHAP has preferentially a tendency of absorbing
F- to enter its lattice and exchanging out CO32- in absorbing F- process, and a phase tranversion from the CHAP to Ca-surplus HAP takes place
at 150～776℃, so the dehydroxy phase tranversion of HAP can not occur at 776℃. The nano CHAP crystals have a behavior of dissolving along crystal length, and 2～3 times capacities absorbing
F- of the pure HAP, and show an effect of dissolving-precipitating adsorption in nanoscale.

Key words: absorption effect in nanoscale, carbonate hydroxyapatite（CHAP）, substituted struc-ture, phase tranversion, absorbing F-action

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