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无机材料学报

无机材料学报

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纳米羟基磷灰石对Ni2+的吸附性能及机理研究

张 俊1， 王德平1，2， 姚爱华1， 黄文旵1，2   

  1. 同济大学 1. 材料科学与工程学院；2. 先进土木工程材料教育部重点实验室， 上海 200092
  • 收稿日期:2008-07-01 修回日期:2008-08-27 出版日期:2009-03-20 网络出版日期:2009-03-20

Research on Adsorption Capacity for Ni2+ and Mechanism of Nano-hydroxyapatite

ZHANG Jun1, WANG De-Ping1,2, YAO Ai-Hua1, HUANG Wen-Hai1,2   

  1. 1.School of Materials Science and Engineering, Tongji University, Shanghai 200092, China; 2.Key Laboratory of Advanced Civil Engineering Materials, Tongji University, Shanghai 200092, China
  • Received:2008-07-01 Revised:2008-08-27 Published:2009-03-20 Online:2009-03-20

PDF (PC)

1929

被引次数

5

摘要： 以硝酸钙和磷酸氢二铵为原料用化学共沉淀法制备纳米羟基磷灰石(n-HA)，用XRD、TEM 和BET表征样品的相组成、结晶形貌和比表面积. 结果表明：制备的针状羟基磷灰石长轴约为31.9nm，短轴约为21.3nm，粒径均匀且表面活性高，具有较低结晶度，比表面积高达135m2/g. 选用Ni2+作为吸附目标离子，通过Zeta电位、XRD和XPS分析n-HA吸附前后的表面电位、晶体物相和表面原子结合能的变化可知：Langmuir等温吸附模型仅适用于Ni2+初始浓度低于0.1mol/L的范围；当Ni2+初始浓度高于0.1mol/L时，Ni2+取代Ca2+与表面的O成键，吸附过程包括离子交换、静电吸附和溶解沉淀作用.

关键词: 羟基磷灰石, 吸附机理, 镍离子

Abstract: Nano-hydroxyapatite was prepared by chemical precipitation with Ca(NO3)2 and (NH3)2HPO4 as reagent. The phase composition, crystal morphology and specific surface area were characterized by XRD,TEM and BET. The results indicate that n-HA synthesized shows needlelike morphology with uniform average size of 31.9nm×21.3nm, week crystallinity, high surface energy, and the specific surface area of 135m2/g. Ni2+ is selected as adsorption object ion, the Langmuir adsorption isotherm is applicable when Ni2+ initial concentration is lower than 0.1mol/L, whereas when Ni2+ initial concentration is higher than 0.1mol/L, Ni2+ substitutes Ca2+ and binds with atom O on the surface. The adsorption of Ni2+ on nHA concludes ion exchange, electrostatic adsorption and dissolution-precipitation processes, This result is proved by the change on surface potential, crystal phase composition and binding energy of surface elements of n-HA before and after adsorption, which are analyzed by Zeta potential, XRD and XPS.

Key words: hydroxyapatite, adsorption mechanism, Ni2+ ions

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