浸渍-碱性微波法载磁活性炭粉对壬基酚的吸附

Adsorption of nonylphenol on magnetic powder activated carbon prepared by impregnation-alkaline microwave method

利用浸渍-碱性微波法制备载磁粉末活性炭,通过等温吸附实验和动力学吸附实验,研究对比了其与原料活性炭、浸渍载铁活性炭对壬基酚的吸附性能。采用氮气吸附仪、FTIR、XRD、国标(GB/T12496.19-1999)邻菲啰啉分光度法及VSM,分别对3种样品进行了物相结构、表面官能团、铁含量及磁性能的分析,并探讨了吸附机理。结果表明,浸渍-碱性微波法载磁活性炭的总孔容及孔隙率均有较大提高;其吸附等温线符合Freundich方程,吸附动力学过程符合准二级动力学方程与孔道内扩散模型,相关系数R2均大于0.900。原活性炭经一定浓度的铁盐溶液浸渍后,铁含量由2%提高到8%。在碱性、N2气氛条件下微波后,铁系物主要存在形式为零价铁和Fe3O4,制得的载磁活性炭饱和磁化强度为1.12 emu/g。

Magnetic powder activated carbon was prepared by impregnation-alkaline microwave method. The adsorptive property of nonylphenol(NP) on magnetic powder activated carbon,raw material activated carbon and iron containing activated carbon were compared through isothermal adsorption experiments and kinetic adsorption experiments. The pore structure,surface chemical functional groups,configuration,iron content and magnetic analysis of three samples were tested by nitrogen adsorption instrument,FTIR,XRD,the GB(GB/T12496. 19-1999) phenanthroline spectrophotometry and VSM,respectively. And the adsorption mechanism of NP on the activated carbon was also discussed. The results showed that after impregnation and alkaline microwave process,the pore volume and surface area of magnetic powder activated carbon have a significant increase, compared with the other two samples. Its adsorption isotherm of NP correspond with Freundlich equation,while its adsorption kinetics curves of NP correspond with pseudo-second order kinetic equation and pore diffusion mode(WM model). After impregnating by iron salt solution,the iron content of activated carbon increases from 2% to 8%. Then after alkaline microwave process,the main ingredients of iron-based material on activated carbon are Fe3O4 and Fe,and the saturation magnetization of magnetic powder activated carbon is 1. 12 emu/g.