• 关键词：羟基磷灰石  除氟  吸附  吸附热力学

• 基金项目：江苏省科技支撑计划(No. BE2011648);创新研究群体科学基金(No. 50921002)

• 徐卫华
• 中国矿业大学化工学院, 徐州 221116

• 冯莉
• 中国矿业大学化工学院, 徐州 221116

• 张曼
• 中国矿业大学化工学院, 徐州 221116

• 王新华
• 中国矿业大学化工学院, 徐州 221116

• 摘要：通过不同钙/磷物质的量比条件下合成羟基磷灰石(HAP),选用除氟容量最高的产物成球,并用FTIR、XRD、SEM对产物的结构进行表征.结果表明,成球以后羟基磷灰石的结构性质并没有发生改变.吸附试验表明,球状滤料的吸附过程受到吸附时间、温度、pH的影响;温度升高有利于吸附过程的进行,80 min内吸附基本达到平衡,吸附过程的最佳pH值在3左右.吸附过程接近单层吸附,吸附过程的ΔH^θ>0,ΔG^θ<0,说明吸附过程是自发吸热的过程.吸附过程中的ΔS^θ为0.0292 kJ·mol^-1·K^-1.

• Abstract：Hydroxyapatite (HAP) was synthetized under conditions of different molar ratios of calcium to phosphorous. The product with the highest defluoridation capacity was selected to prepare HAP ball, and its structures were characterized with FTIR, XRD and SEM. Results showed that the structures and properties of HAP did not change after spheroidization. Adsorption test indicated that the adsorption process of globular filter material was influenced by adsorption time, temperature and pH. Temperature increase was conducive to the adsorption process and adsorption equilibrium was approached within 80 mins. The optimum pH for adsorption was about 3. The adsorption process was spontaneous and endothermic because of ΔH^θ> 0 and ΔG^θ<0, as well as close to monolayer adsorption. In adsorption process ΔS^θ was 0.0292 kJ·mol^-1·K^-1.

• Key words：hydroxyapatite  defluoridation  adsorption  adsorption thermodynamics

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