羟基磷灰石吸附水溶液中Zn2+影响因素的研究

对羟基磷灰石(HAp)吸附水溶液中Zn2 的各种影响因素进行了系统的研究.实验结果表明,去除率与Zn2 的初始浓度呈负相关关系;酸性环境不利于HAp对Zn2 的吸附,随着pH值的增加去除率迅速升高,当pH值升到10左右时,去除率几乎接近100%,之后随着碱性的增强去除率反而下降;去除率与作用时间、HAp的用量和作用温度呈正相关关系.HAp对水溶液中Zn2 的吸附符合Langmuir等温吸附模型,它对Zn2 的最大吸附容量为6.72 mg/g.

Factors affecting the adsorption of aqueous zinc on hydroxyapatites

In this paper,the factors affecting the adsorption of aqueous zinc on HAp are investigated.Laboratory experiments show that the zinc removal efficiency decreases with the increasing initial concentration of the solution and increases with the increasing reaction time,HAp dose and temperature,and that the influences of pH value on the removal of zinc ions are very complicated because it is extremely disadvantageous to the zinc removal efficiencies in strong acid conditions,and increases rapidly with the increasing pH value,and almost reaches 100% with pH adjusted to 10,then decreases with the increasing pH value.Typical adsorption isotherms are calculated,and the Langmiur type is best.The maximum zinc adsorption capacity for HAp is 6.72 mg/g.