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Fe_3O_4为内核、SiO_2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Fe_3O_4@SiO_2@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。Fe_3O_4@SiO_2@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。
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 Fe_3O_4@SiO_2@CS/PAA,of which Fe_3O_4 is the core,SiO_2 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 Fe_3O_4@SiO_2@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.
出处
《太原理工大学学报》
CAS
北大核心
2017年第2期149-155,共7页
Journal of Taiyuan University of Technology
基金
国家自然科学青年基金资助项目:磁性核壳结构膨润土基煤泥水沉降复合絮凝剂的制备研究(51204119)
山西省青年科学基金:磁响应性絮凝剂的组装设计与嵌套结构形成机理研究(2014021015-4)
磁性Fenton层状结构材料的构筑及其对焦化废水污染物的吸附-氧化协同作用机制研究(2015021107)
关键词
磁性壳聚糖
含铬废水
吸附
核壳结构
吸附动力学
magnetic chitosam
Cr(Ⅵ)-containing wastewater
adsorption
core-shell structure
adsorption kinetics