聚乙烯亚胺负载四氧化三铁对刚果红的吸附性能

Removal of Congo Red by PEI@Fe_3O_4Magnetic Composites in Batch Mode

采用表面负载法制得聚乙烯亚胺/四氧化三铁吸附剂(PEI@Fe_3O_4),以刚果红(Congo red,CR)为吸附质,系统考察p H值、吸附时间和染料初始浓度等因素对吸附材料性能的影响.结果表明,离子强度有利于CR在PEI@Fe_3O_4上的吸附量;303 K时的最大吸附量为58.3 mg/g,等温吸附曲线符合Redlich-Peterson方程且吸附过程符合Elovich动力学模型.解吸再生实验表明,吸附剂多次吸附/解吸附循环仍可维持吸附性能,显示出良好的化学稳定性.因此,该吸附剂在染料废水CR去除方面具有良好应用前景.

Polyethylenimine@Fe3O4magnetic composites(PEI@Fe3O4)were prepared by a surface overlay method and characterized.Its adsorption property toward Congo red(CR)from solution was performed in batch mode.The results showed that it was favor of CR adsorption onto PEI@Fe3O4with the increase of ionic strength.Adsorption isotherms from experimental results were fitted well by Redlich-Peterson model and the adsorption quantity from experiment was up to 58.3 mg/g at 303 K.The kinetic process was best predicted by the Elovich model.Desorption and regeneration experiments showed that the adsorbent could retain its adsorption capacity even after adsorption/desorption cycles,showing excellent mechanical and chemical stabilities.It was implied that PEI@Fe3O4is promising in the removal of anionic dyes from wastewater.