花型MOF-La的合成及其吸磷效果的研究

Synthesis on MOF-La with Flower Struture and Its Adsorption of Phosphorus

采用溶剂热法合成MOF-La材料,通过NaOH溶液对MOF-La进行调节,得到花型结构的MOF-La材料.利用X-射线衍射仪(XRD)、比表面及孔径分析仪和扫描电子显微镜(SEM)对MOF-La及花型MOF-La材料进行表征,采用紫外可见分光光度计(UV-vis)测试花型MOF-La材料吸附后水中磷酸盐的浓度,从而建立结构与性能的关系.结果表明:(1)MOF-La具有水稳定性;(2)花型MOF-La材料对磷酸盐的最大吸附容量为24.4/g;(3)准二级动力学模型能较好地描述花型MOF-La材料对水中磷酸盐的吸附过程,Langmuir和Freundlich等温吸附模型均能拟合花型MOF-La材料对水中磷酸盐的吸附数据.

MOF-La was synthesized by hydrothermal method, and the MOF-La with flower structure was obtained by using of NaOH solution. The surface structure and morphology were characterized by X-ray diffraction, specific surface and aperture analyzer and scanning electron microscopy(SEM).The equilibrium concentration of phosphate in the water was measured by UV-visible spectrophotometer(UV-vis). The structure and properties of MOF-La were analyzed. The conclusions are as follows:(1) MOF-La has good water stability;(2) The adsorption capacity of MOF-La/g;(3) The kinetics of phosphate adsorption of MOF-La with flower structure can be fitted by the pseudo-second-order kinetic model. The data for phosphate adsorption of MOF-La with flower structure can be described by Langmuir and Freundlich isotherm adsorption models.