树脂基水合氧化铈复合材料深度去除污水中磷酸盐

通过"前驱体导入-原位沉积"的工艺路线,将水合氧化铈(HCO)纳米颗粒负载入强碱阴离子交换树脂(SAE)孔道内,制得复合纳米吸附剂HCO@SAE并用于污水中磷酸盐的深度去除。试验结果表明:与其母体材料SAE、粉末活性炭(PAC)和大孔吸附树脂XAD-4相比,HCO@SAE具有最佳的磷酸盐吸附性能。溶液pH值对HCO@SAE吸附磷酸盐的性能有较大影响,且在中性条件下可获得最大的磷酸盐吸附量(30.96 mgP/g)。得益于负载HCO纳米颗粒对磷酸盐的专属内配位络合作用,HCO@SAE能够在共存高浓度竞争离子的条件下实现对磷酸盐的选择性吸附。采用NaOH-NaCl混合溶液作为脱附剂可实现对吸附饱和HCO@SAE的高效再生,再生后吸附性能保持稳定,从而实现多批次循环吸附操作。

Deep Removal of Phosphate in Wastewater by Resin-based Hydrated Cerium Oxide Composite

Hydrated cerium oxide(HCO)nanoparticles were loaded into strong-base anion exchanger(SAE)through the process of"precursor lead-in and in-situ deposition",and a composite nano adsorbent HCO@SAE was prepared and used for deep removal of phosphate in wastewater.HCO@SAE exhibited the best phosphate removal performance as compared to its host materials:SAE,powder activated carbon(PAC)and macroporous polystyrene resin(XAD-4).The p H value of the solution had a great influence on phosphate adsorption performance of HCO@SAE,and the maximum phosphate adsorption capacity(30.96 mgP/g)could be obtained at neutral pH.Benefiting from the inner-sphere complexation between phosphate and the loaded HCO nanoparticles,HCO@SAE was capable of selective adsorbing phosphate even coexisting with high levels of other competing anions.More attractively,the exhausted HCO@SAE could be effectively regenerated by using NaOH-NaCl binary solution as the desorbent.After regeneration,its adsorption performance remained stable,thus realizing multi-batch cyclic adsorption operation.