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Freundlich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.
The potential feasibility of ethylenediamine modified sawdust as the adsorbent for removal of anionic dye 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 （qm） 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 red can be devided into two phases： membrane diffusion and particle internal diffusion. The best desorption meth- od for saturated sawdust was NaOH.
出处
《郑州大学学报（工学版）》
CAS
北大核心
2013年第2期28-31,36,共5页
Journal of Zhengzhou University（Engineering Science）
基金
河南省科技攻关计划资助项目(102102210103)
河南省教育厅科技攻关资助项目(2010A610003)
关键词
乙二胺
锯末
刚果红
吸附
动力学研究
再生
ethylenediamine
sawdust
congo red
adsorption
kinetic study
regeneration
