【摘要】 针对含Cr（Ⅵ）废水来源广、危害大、易蓄积、难去除等特点,基于壳聚糖对Cr（Ⅵ）良好的吸附性能,合成了具有以Fe₃O₄为内核、SiO₂为夹心层、CS/PAA为外壳的类"三明治"结构,富含氨基、羟基、羧基等功能基团的新型吸附剂Fe₃O₄@SiO₂@CS/PAA.在最优工艺条件t=75℃,pH=2下,吸附剂投量仅为1.0g·L-1时,对质量浓度为100mg·L-1的Cr（Ⅵ）模拟废水Cr（Ⅵ）的去除率高达64.69%,这表明该吸附剂具有较高的吸附量,该吸附剂对Cr（Ⅵ）的吸附机理服从准二级动力学过程,该吸附过程以化学作用为主。Fe₃O₄@SiO₂@CS/PAA是一种优良的Cr（Ⅵ）吸附剂,将有效解决Cr（Ⅵ）难处理的问题,为吸附剂的无毒无害化的研究提供一定的理论和现实指导意义。更多还原

【Abstract】 According to the fact that Cr（Ⅵ）-containing wastewater has widespread sources,great toxicity,ease to accumulate but difficulty to remove,on the basis of the excellent adsorption performance of chitosan（CS）,a novel"sandwich"structure adsorbent Fe₃O₄@SiO₂@CS/PAA,of which Fe₃O₄ is the core,SiO₂ is the sandwich layer,and CS/PAA is the shell,was synthesized.The as-prepared adsorbents were rich in amino,carboxyl,and hydroxyl groups.The absorbents for treatment of Cr（Ⅵ）（100mg/L）simulation wastewater exhibited high adsorption for Cr（Ⅵ）under the optimum condition t=75 ℃,pH=2,ρm=1.0g/L,and the Cr（Ⅵ）removal rate reached64.69%.The adsorption process follows a pseudo-second-order kinetic model and is dominated by chemical action.The Fe₃O₄@SiO₂@CS/PAA particles are excellent adsorbent for Cr（Ⅵ）,which solves the difficult removing problem of Cr（Ⅵ）and provides theoretical and practical significance for non-toxic and harmless adsorbents.更多还原