含不同粒径羟基磷灰石牙膏对铜离子吸附作用的研究

Effects of dentifrice containing hydroxyapatite particles with various grain sizes on the sorption of Cu(Ⅱ) ion from aqueous solution

目的:研究含不同粒径羟基磷灰石(hydroxyapatite,HA)的牙膏对水溶液中铜离子的吸附效能。方法:取3%60 nm HA牙膏、3%12μm HA牙膏、空白对照牙膏分别配成3组不同浓度牙膏悬液,分别加入初始浓度为4.0 mg/L的铜离子溶液中,静置24 h后去上清液用电感耦合等离子发射光谱仪测定残余铜离子的量,计算铜离子吸附率。结果:吸附实验后各组溶液中铜离子浓度随着牙膏悬液浓度增加而降低,含60nm HA牙膏组中吸附后铜离子浓度最低,其对铜离子的吸附效能高于含12μm HA牙膏组和空白牙膏组,含12μm HA牙膏组和空白牙膏组对铜离子吸附效能的比较差异无统计学意义。结论:可能由于纳米级材料存在尺寸效能,含纳米级HA牙膏对水溶液中铜离子的吸附效能最高,提示在牙膏中加入纳米级HA可获得良好的重金属离子吸附效果。

Objective To study the capacity of dentifrice containing hydroxyapatite （HA） particles with various grain sizes on the sorption of Cu （ II ） ion from aqueous solution. Methods Three groups of dentifrice suspensions containing 3% HA particles with 60 nm grain size, 3% HA particles with 12 μm grain size, and blank dentifrice were prepared with serial concentrations. Copper ion solutions with initial concentration of 4.0 mg/L were mixed with dentifrice suspensions respectively and then been kept still for 24 hours. The residual copper ion concentration of the supernatant was measured by inductively coupled plasma emission spectrometer and the sorption rate of copper ion was calculated. Results The residual copper ion concentration of the supernatant decreased with increase of the concentration of dentifrice suspensions. The sorption rate of copper ion of dentifrice containing 60 nm HA was highest among the three groups. Conclusion Nano HA should be added into dentifrice to enhance the sorption capacity of copper ion from aqueous solution.