改性废弃稀土抛光粉吸附除磷的研究

Utilization of Ce(IV)/La(III) Hydroxide as Recovery of Waste Ceria Polishing Powder from Glass Polishing for Removal of Phosphate

探讨了废弃稀土抛光粉的改性方法以及改性后材料对磷酸根离子的吸附特性．结果表明，改性稀土抛光粉对磷酸根阴离子显示了良好的吸附效果，改性后的磷吸附量是改性前的100倍，在室温（25℃），初始浓度5～150mg／L，pH为3、5、7、9、11的条件下，其吸附等温线能很好地用Langmuir方程进行描述．对于低浓度（5～10mg／L）磷溶液，改性后材料在所选pH条件下对磷的去除率可达100％，表明将废弃稀土抛光粉改性成磷吸附剂是可行的．

This research has investigated the possibility of converting waste polishing agent（mainly a mixture of Ce（Ⅳ）/La（Ⅲ） oxide） into an adsorbent for phosphate removal from water. The phosphate adsorption capacity of the resultant adsorbent was 100 times higher than that of the raw material. The adsorption isotherm fitted well to the Langmuir isotherm at room temperature in an initial concentration range of 5 mg/L to 150 mg/L and at selected pH of 3,5,7,9,11, respectively. In the low phosphate concentra- tion range （5-10 mg/L）, 100% phosphate removal could be achieved at the selected pH. It proves that it＇s feasible to remove phos- phate in water using the modified waste ceria polishing powder.