摘要
采用静态吸附法对比了2种阴离子染料和2种阳离子染料在头发上的吸附能力,并测定了头发对阳离子染料碱性品红和亚甲基蓝的吸附动力学和吸附等温线,用准一级、二级动力学模型和Langmuir、Freundlich等温吸附模型进行拟合,计算了热力学参数。结果表明,头发对阳离子染料吸附能力较强,而对阴离子染料吸附能力较差,这主要和头发表面与染料之间电性引力有关。头发对碱性品红和亚甲基蓝在中、碱性条件下吸附效果较好,120 min达到吸附平衡,相同条件下,吸附量:亚甲基蓝>碱性品红。准二级动力学模型和Freundlich等温吸附模型能较好地描述头发对阳离子染料的吸附过程。吸附热力学参数计算结果表明,该吸附是一种自发、吸热、以多分子层吸附为主的物理过程。
A comparison study was made on the capacities of human hair adsorpting with two cationic dyes and two anionic dyes,also the adsorption isotherms and adsorption kinetics of fuchsin basic and methylene blue onto hair were measured through static adsorption experiments.Adsorption isothermal and adsorption kinetics data were interpreted by pseudo-first-order,pseudo-second-order kinetic models,and Langmuir,Freundlich equations models,and the parameters of thermodynamics were also calculated.The results show that the adsorption capacities with cationic dyes are much higher than those with anionic dyes,this is consistent with the electrical gravity between dyes and hair.Hair had good adsorption properties when neutral and alkaline with fuchsin basic and methylene blue and the adsorption equilibrium time was about 120 min,on the same condition,the adsorption capacity was methylene blue fuchsin basic.The adsorption kinetics fit to pseudo-second-order model and the adsorption isothermal fit to Freundlich adsorption model.The calculated thermodynamic parameters show that the adsorption of cationic dyes onto hair were spontaneous,endothermic,molecular layer,physical adsorption process.
出处
《应用化工》
CAS
CSCD
2013年第8期1401-1404,1407,共5页
Applied Chemical Industry
基金
浙江省自然科学基金2009年资助项目(Y4090166)
关键词
头发
阳离子染料
吸附动力学
吸附热力学
human hair
cationic dyes
adsorption kinetics
adsorption thermodynamics
作者简介
朱仙弟（1965-），男，浙江台州人，台州学院副教授，主要从事无机材料和废水处理研究。电话：13566652824．E—mail：zxdyxy@tzc．edu．cn
