LaCl_(3)@Zeolite自支撑多孔吸附材料的制备及其同步脱氮除磷效果

Preparation of LaCl_(3)@Zeolite Self-supporting Porous Adsorption Materials and Their Effects of Simultaneous Nitrogen and Phosphorus Removal

以粉煤灰为前驱体、偏硅酸钠为激发剂,通过化学发泡原理制备富含类沸石相的粉煤灰基多孔地质聚合物;以多孔地质聚合物为基本骨架,经水热转化、LaCl_(3)负载改性制备自支撑多孔吸附材料。采用扫描电子显微镜(SEM)、X射线衍射(XRD)、比表面积分析(BET)、X射线能谱分析(EDS)等测试手段对所得吸附材料进行了表征,并通过静态吸附试验研究其同步脱氮除磷效果。研究结果表明:利用氯化镧溶液浸渍自支撑多孔吸附材料,可将La^(3+)成功负载于多孔吸附材料上;当氮溶液和磷溶液pH值为6、氨氮初始浓度为25 mg/L、磷初始浓度为30 mg/L、固液比(吸附材料与氮磷水样质量比)为1∶15时,LaCl_(3)@Zeolite自支撑多孔吸附材料对氨氮和磷的去除率分别达到了90%和100%,且其静态吸附等温线符合Langmuir等温吸附模型,吸附动力学数据符合准二级动力学方程。

Using fly ash as precursor and sodium metasilicate as activator,fly ash-based porous geopolymer rich in zeolite-like phase was prepared by chemical foaming principle.Using porous geopolymer as the basic framework,the self-supporting porous adsorption materials were prepared by hydrothermal conversion and LaCl_(3) loading modification.The performances of the above adsorption materials were characterized by SEM,XRD,BET and EDS.Meanwhile,the effect of simultaneous nitrogen and phosphorus removal for the prepared adsorption materials were studied through static adsorption experiments.The research results show that the use of lanthanum chloride solution to impregnate the self-supporting porous adsorption material can successfully load La^(3+) on the porous adsorption material.When the pH value of the nitrogen and phospho-rus solution is 6,the initial concentration of ammonia nitrogen is 25 mg/L,the initial concentration of phosphate is 30 mg/L,and the solid-to-liquid ratio is 1∶15(mass ratio of the adsorption meterial to the nitrogen and phosphorus water sample),the removal rate of ammonia nitrogen and phosphorus from LaCl_(3)@Zeolite self-supporting porous adsorption material reaches 90%and 100%,respectively.And the static adsorption isotherm conformed to the Langmuir isotherm adsorption model,and the adsorption kinetic data conformed to the pseudo-second-order kinetic equation.