水合氧化铈负载沸石对含磷废水的深度处理

Phosphorus Removal Using Hydrous Ceric Oxide Impregnated Zeolite HCO-MZ

通过浸渍-焙烧-浸渍活化处理方法制备水合氧化铈负载天然沸石（HCO—Mz）吸附剂，探讨了该吸附剂对水中磷的吸附性能．研究表明，当Ce（VI）离子浓度为0．050mol／L，在硫酸溶液中加热浸渍，干燥后400℃高温焙烧处理，再经稀硫酸加热活化，80～100℃干燥后制得的HCO-Mz吸附剂，其理论负载铈量m（水合氧化铈）／m（沸石）约为172．5mg／g．采用本研究方法制得的HCO—MZ吸附剂可在pH值为4—8的范围内使用，其吸附行为可很好地采用Langmuir等温方程式进行描述．在室温、磷初始质量浓度为30mg／L、HCO—MZ投加量为30．0g／L的实验条件下得到的磷去除率可达99％，对磷的吸附容量约为0．99mg／g，适用于工业污水处理和生活污水的深度除磷．

Hydrous ceric oxide impregnated zeolites （HCO - MZ） were prepared by mixing a small quantity of natural zeolite with solution of Ce（VI） sulphate, followed by calcination and acid activation treat- ments. The adsorption behavior of,phosphate on the HCO - MZ was studied. The optimal synthetic condition was found as the following： concentration of Ce（VI） at 0. 050 tool/L, heating in 6 mol/L H2SO4 solution for 12 h at 90 ℃, calcination at 400 ℃, activating in dilute H2SO4 solution, drying at 80 - 100℃, resulting in a loading amount of 172. 5 mg/g zeolite. About 99 % removal of phosphate and an adsorption capacity of ca. 0. 99 mg/g could be achieved within 2. 0 h at the initial concentration phosphate of 30 mg/L, dosage of adsorbent at 30. 0 g/L in the natural water pH range of 4 to 8. The adsorption isotherm fitted well to the Langmuir＇s model.