绿色法制备多孔球状镧铁复合物及其吸附磷性能研究

利用水热法和碱刻蚀法制备多孔球状镧铁复合物（LFA-C）。通过扫描电镜（SEM）、红外光谱仪（FTIR）、X射线衍射仪（XRD）和比表面及微孔物理吸附仪对复合物材料进行表征分析，并考察其作为吸附剂对磷酸盐的吸附性能。结果表明，LFA-C材料表面形貌粗糙多孔，碱刻蚀过程促进氢氧化镧在LFA-C的表面生成，同时LFA-C的比表面积增加有利于获得更多的吸附活性位点。吸附动力学研究表明，LFA-C的吸附过程符合准二级动力学模型。热力学研究发现Langmiur模型能更好地拟合吸附等温线，拟合饱和吸附量为159.08 mg/g。在共存离子条件下，LFA-C吸附磷酸盐的抗干扰能力强，同时LFA-C通过吸附-解析过程展现出良好的循环性能。LFA-C作为高效去磷、抑制富营养化的环境功能材料，具有广阔的应用前景。

Study on preparation of porous spherical lanthanum-iron complex by green method and its phosphate adsorption performance

Porous spherical lanthanum-iron complexes（LFA-C） were prepared by hydrothermal and alkaline etching methods.The composite was characterized and analyzed by scanning electron microscopy（SEM），fourier transform infrared spectroscopy（FTIR），X-ray diffraction（XRD），specific surface and microporous physical adsorption instrument.And its adsorption properties of phosphate as adsorbent was investigated.The results showed that the surface of porous lanthanum-iron complexes was rough and porous.The alkali etching process promoted the formation of La（OH）₃ on the surface of LAF-C.At the same time，the increase of the specific surface area of LAF-C was conducive to obtain more adsorption active sites.The study of adsorption kinetics showed that the adsorption process of LAF-C conformed to the quasi second-order kinetic model.The saturated adsorption capacity was 159.08 mg/g.Under the condition of coexisting ions，LAF-C had strong anti-interference ability to adsorb phosphate.At the same time，LAF-C showed good cyclic performance through adsorption-desorption process.As an environmental functional material with high efficiency in dephosphorization and eutrophication inhibition，LFA-C had broad application prospects.