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
Abstract
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0.050 MOl/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172.5 Mg/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30 Mg/l、HCO-Mz投加量为30.0 g/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0.99 Mg/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 treatments.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 mol/L,heating in 6 mol/L H 2SO 4 solution for 12 h at 90 ℃,calcination at 400 ℃,activating in dilute H 2SO 4 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.