新生磷酸钙对绿原酸的吸附特性研究

Adsorption Characteristics of Chlorogenic Acid on Fresh Calcium Phosphate

以新生磷酸钙为吸附剂，通过静态吸附试验研究其对绿原酸的吸附性能，系统考察了吸附时间，pH和绿原酸的初始质量浓度对新生磷酸钙吸附效果的影响，并进行了吸附动力学和吸附等温线研究。结果表明：当绿原酸的初始质量浓度分别为25mg／L，50mg／L，75mg／L时，新生磷酸钙对绿原酸的吸附过程均可用准二级动力学方程描述（R2=0．9743～0．9817）。pH是影响吸附作用的重要因素，当pH在7．3＋0．1时，绿原酸的吸附量达到最大值。吸附等温曲线符合Lar】gmuir模型（R2=0．9970），由Langmuir线性拟合方程可得新生磷酸钙对绿原酸的饱和吸附量为15．36mg／g。

In the present study, fresh calcium phosphate was used to remove chlorogenic acid from aqueous solutions under different experimental conditions. The effects of adsorption time, pH, and initial chlorogenic acid concentration on adsorption efficiency were systematically investigated, Meanwhile, the adsorption kinetics and isotherm were also studied, The results showed that the pseudo-second-order equation provided the best correlation to the experimental data （R2=0.974 3-4）.981 7）, under the initial chlorogenic acid concentration were 25 mg/L, 50 mg/L and 75 mg/L. pH value was an important factor for affecting adsorption. The amount of adsorbed chlorogenic acid reached maximum when pH value was 7.3＋0.1. The results showed that the adsorption isotherm could be described by Langmuir model （R2=0.997 0）, and the saturated adsorption capacity reached 15.36 mg/g.