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制备条件对掺镁羟基磷灰石结构及除氟性能的影响
作者:刘纯玮   刘忆玲 陈缜缜   
单位:(中国矿业大学化工学院 江苏 徐州 221116) 
关键词:镁掺杂羟基磷灰石 化学沉淀法 制备工艺 除氟性能 
分类号:TQ132.2
出版年,卷(期):页码:2019,47(7):0-0
DOI:
摘要:

 为了提高羟基磷灰石(HAP)滤料的除氟能力,以磷酸、四水硝酸钙和六水硝酸镁为原料,采用化学沉淀法制备一种Mg掺杂羟基磷灰石(Mg-HAP)除氟滤料,研究了制备条件对滤料除氟性能的影响,探究了Mg-HAP滤料的结构与除氟性能之间的关系。结果表明:掺镁量和陈化时间主要影响晶体结构;钙、镁与磷的摩尔比和反应温度主要影响Mg-HAP的纯度;在滤料晶体结构相对保持完整时,滤料的羟基含量越多,滤料的除氟容量越高。在n(Mg)/n(Ca+Mg)为0.10,n(Ca+Mg)/n(P)为1.50,反应温度30 ℃,搅拌1 h,90 ℃陈化60 min的优化制备工艺条件下,制备的Mg-HAP滤料样品,Mg在HAP的内部分布均匀;Mg取代羟基磷灰石晶格中的少部分Ca,导致晶面结构发生畸变,晶格缺陷增加,表面吸附能力增强;同时滤料的羟基含量提高,滤料的除氟容量提高。与HAP相比,Mg-HAP除氟容量提高了近4倍。

 To improve the defluoridation capacity of hydroxyapatite (HAP), a Mg-doped hydroxyapatite (Mg-HAP) was prepared by a chemical precipitation method using H3PO4, Ca(NO3)2•4H2O and Mg(NO3)2•6H2O as raw materials. The effect of preparation condition on defluoridation properties of the Mg-HAP was investigated. The relationship between the structure and the defluoridation properties of the Mg-HAP was analyzed. The results indicate that the content of added Mg (n(Mg)/n(Ca+Mg) and aging time mainly affect the crystal structure of Mg-HAP, and the molar ratio (n(Ca+Mg)/n(P)) and the reaction temperature mainly affect the purity of Mg-HAP. The defluoridation capacity of Mg-HAP with the more hydroxyl is greater. The Mg-HAP sample can be prepared under optimized condition (i.e., n(Mg)/n(Ca+Mg) of 0.10, n(Ca+Mg)/n(P) of 1.50, reaction temperature of 30 ℃, stirring for 1h, aging at 90 ℃ for 60 min). Under the optimized condition, Mg is evenly distributed on the surface of HAP, and the amount of Ca in the lattices of HAP is replaced by Mg, thus leading to the distortion of crystal plane and the increase of lattice defects, and strengthening the surface adsorptive capacity. Also, the defluoridation capacity increases with the increase of hydroxyl content. The defluoridation capacity of Mg-HAP is nearly four times greater than that of HAP.

基金项目:
江苏省科技重点研究项目(BE2015628)。
作者简介:
参考文献:

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