可渗透反应墙结合CoFe2O4/GO纳米复合材料去除模拟废水中Pb(II)及其吸附机理研究

为探究氧化石墨烯负载高铁酸钴(CoFe2O4/GO)纳米复合材料性质及其对水溶液中Pb(II)的去除效果，采用X射线衍射(XRD)、傅里叶红外光谱(FTIR)、扫描电子显微镜(SEM)、X射线光电子能谱(XPS)、超导量子干涉仪(SQUID)、拉曼光谱及N2吸附对合成的CoFe2O4/GO纳米复合材料进行表征，利用可渗透反应墙对材料实用性进行探究，探索反应过程中不同酸度及温度对Pb(II)去除效果的影响，并利用动力学及等温吸附对CoFe2O4/GO纳米复合材料去除水溶液中Pb(II)的机理进行研究。结果表明，XRD表征发现GO的晶面及CoFe2O4的立方晶系尖晶石型结构。FTIR光谱显示Co-O和Fe-O振动，且CoFe2O4/GO表面含有大量-OH、-C=O、及-COO-等不饱和基团。SEM谱图观察到出CoFe2O4发生了部分团聚，且观察到存在一些空隙结构，其平均粒径为48.93 nm。XPS表征观察到CoFe2O4/GO表面含有C、O、Fe、Co等元素，且有Co2p存在。通过CoFe2O4/GO磁性表征，其饱和磁化强度约为27.01 emu/g。该复合材料D峰：G峰的比值较高，表明含有大量含氧基团。CoFe2O4/GO的BET比表面积为148.672 3 m2/g，孔径集中在3.93 nm左右。可反应渗透强处理模拟废水，在100 min后逐渐达到饱和，在4次内重复利用该材料可取的很好效果。pH值在8时为反应体系最优酸度，随着温度的升高，Pb(II)去除率随之增加，温度升高有利于吸附。Freundlich吸附等温方程及准二级动力学更适用于描述CoFe2O4/GO吸附Pb(II)的过程。可渗透反应墙结合CoFe2O4/GO纳米复合材料去除模拟废水中Pb(II)具有良好效果。

Study on Pb(II) Removal from Simulated Wastewater by Permeable Reaction Barrier Combined with CoFe2O4/GO Nanocomposites and Its Adsorption Mechanism

In order to investigate the properties of graphene oxide supported cobalt ferrate (CoFe2O4/GO) nanocomposites and their removal effects on Pb(II) in aqueous solution, the synthesized CoFe2O4/GO nanocomposites were characterized by XRD, FTIR, SEM, XPS, SQUID, Raman and N2 adsorption. The permeable reaction barrier was used to investigate the practicability of these materials and the effect of different acidity and temperature on the removal of Pb (II) in the reaction process. The mechanism of removing Pb (II) from aqueous solution by CoFe2O4/GO nanocomposites was studied by means of kinetics and adsorption isotherm. The results show that the crystal plane of GO and the cubic spinel structure of CoFe2O4 are found by XRD characterization. FTIR spectra showed that Co-O and Fe-O vibrate, and the surface of CoFe2O4/GO contains a large number of unsaturated groups such as -OH, -C=O, and-COO-. SEM spectra showed that CoFe2O4/GO partially agglomerated and some void structures were observed, the average particle size of CoFe2O4 is 48.93 nm. XPS characterization showed that the surface of CoFe2O4/GO contained C, O, Fe, Co, especially Co2p. The saturation magnetization of CoFe2O4/GO is approximately 27.01 emu/g. The ratio of D peak to G peak of these materials is higher, which indicates that CoFe2O4/GO has better oxidation, and it contains a large number of oxygen-containing groups. The BET specific surface area of CoFe2O4/GO is 148.672 3 m2/g, and the pore size is concentrated at approximately 3.93 nm. The simulated wastewater can be treated by permeable reaction barrier and saturated gradually after 100 minutes. It is desirable to reuse the material within 4 times. The optimum acidity of the reaction system is pH =8. With the increase of temperature, the removal rate of Pb (II) increases, and the increase of temperature is beneficial to adsorption. Freundlich isotherm sorption and quasi-second-order kinetics are more suitable for describing the process of CoFe2O4/GO adsorbing Pb (II). Permeable reaction barrier combined with CoFe2O4/GO nanocomposites has a good effect on removal Pb (II) from simulated wastewater.