乙二胺改性锯末对刚果红的吸附研究-《郑州大学学报(工学版)》

文章信息/Info

作者:: 邹卫华; 李苛; 高帅鹏; 等.; 郑州大学化工与能源学院,河南郑州,450001, 郑州大学化工与能源学院,河南郑州,450001, 郑州大学化工与能源学院,河南郑州,450001, 郑州大学化工与能源学院,河南郑州,450001

Author(s):: ZoU Wei-hua; LI Ke; GAO Shuai-peng; BAI Hong-juan; School of Chemical Engineering and Engineering,Zhengzhou University ,Zhengzhou 450001 ,China

Keywords:: ethylenediamine; sawdust; congo red; adsorption; kinetic study ; regeneration

摘要:: 将锯末使用乙二胺改性作为吸附剂,研究其对阴离子染料刚果红的吸附行为.考察pH值,盐度,温度,初始浓度以及时间等因素对吸附的影响.结果表明,采用乙二胺改性的锯末对刚果红的吸附量增大,未改性和改性锯末的最大吸附量分别为6.99和14.77 mg·g-1.吸附过程符合Freundlieh吸附等温式；采用准二级动力学模型和粒子扩散模型对刚果红的吸附动力学及机理进行研究,锯末对刚果红的吸附分为膜扩散和颗粒内扩散两个阶段.吸附饱和的锯末用NaOH解吸再生效果最好.

Abstract:: The potential feasibility of ethylenediamine modified sawdust as the adsorbent for removal of anionicdye of congo red from aqueous solution was investigated. The experiments were carried out as function of pH,salt concentration,temperature,initial concentration and contact time. The results show that the sawdust mod-ified with ethylenediamine made the adsorption capacity of congo red increase. By functionalizing,the adsorp-tion capacity (q.) of sawdust for congo red was increased from 6.99 to 14.77 mg/g at 298 K. The equilibri-um data agreed well with the Freundlich model.The pseudo-second order and the intra-particle diffusion mod-el were used for discussing the kinetics and mechanism of adsorption of congo red.The adsorption of congo redcan be devided into two phases: membrane diffusion and particle internal diffusion.The best desorption meth-od for saturated sawdust was NaOH.