磁性共价有机框架材料吸附甲基橙和茜素绿两种阴离子有机染料

Adsorption of Two Anionic Organic Dyes Methyl Orange and Alizarin Green Using a Magnetic Covalent Organic Frameworks

以自制的磁性共价有机框架材料(COF)为吸附剂,采用静态吸附法研究了其对甲基橙(MO)和茜素绿(AG-25)的吸附行为。结果表明,在25℃,p H值6~8的条件下,磁性COF对两种阴离子染料的的吸附量分别为997和1314 mg/g。两种染料的吸附等温线符合Langmuir等温吸附模型,表明吸附过程为单层吸附;吸附动力学均符合准二级动力学模型,说明吸附过程以化学吸附为主。磁性COF对水体中的阴离子染料体现出高吸附量和快速吸附的特点,具有潜在的价值。

Adsorption of methyl orange（ MO） and alizarin green（ AG-25） onto a novel magnetic covalent organic frameworks（ COF） were studied via static adsorption method. The maximal adsorption capacities reach997 mg/g for MO and 1314 mg/g for AG-25 within the p H range of 6 ～ 8 at 25 ℃. The adsorption isotherms follow Langmuir isothermal adsorption model,indicating a monolayer adsorption. The pseudo-second-order model best fits adsorption kinetics data,implying the adsorption processes are mainly chemical adsorption.Magnetic COF shows advantages of excellent adsorption performance and rapid separation,which is believed to enlarge the application of COF on the removal of anionic dyes from wastewaters.