凹凸棒土复合吸附剂对磷酸根吸附行为的研究

Study on the Treatment of Water Containing Phosphates with Attapulgite Compound Adsorbents

实验以凹凸棒土和氯化镁为原料,在高温下进行灼烧得到粒状的无机复合物。该复合物对水体中的磷具有很好的吸附性。用X射线和扫描电镜对吸附剂吸附前后的表面进行分析,阐述其吸附过程表面积的变化及吸附机理。结果表明:该吸附剂对磷酸根吸附的动力学服从Langmuir速率方程,温度升高加快吸附速率。在磷酸根初始浓度为100mg·g-1、吸附温度为20℃、pH为5.4时可获得最大吸附容量为34.8mg·g-1。

The particulate inorganic adsorbent was obtained by reaction of attapulgite and MgCl3 at high temperature . The adsorbent has a good adsorptivity. The yield and mechanisms of phosphate removal were explained on the basis of analysis on the surface of the particle before and after adsorption by X-ray spectroscopy and SEM. In addition, adsorption kinetics follows Langmuir equation, the adsorption rate of phosphate was significantly influenced by temperature. The largest adsorptive capacity could be 34.8 mg·g^-1 at initial concentration of 50 mg·L^-1, adsorption temperalure 20℃, pH 5.4.