摘要
脱脂棉在碱存在下与环硫氯丙烷发生醚化反应,合成了一种环境功能材料——聚硫醚纤维素(PTCC)。考察了溶液酸度对吸附容量的影响并研究了PTCC对3种阳离子染料的吸附动力学与热力学。研究结果表明,中性介质较有利于吸附的进行;298K、pH=7.0时,静态吸附2h后,吸附趋于平衡,PTCC对碱性艳蓝B、碱性艳蓝R和夜蓝的饱和吸附量分别为726、652和320mg/g;PTCC对阳离子染料的吸附过程符合Lagergren二级吸附动力学方程,吸附速率常数k2随着温度的降低而升高,低温有利于吸附反应的进行;吸附过程ΔG、ΔH和ΔS均为负值,表明该吸附是自发的放热过程,主要是通过范德华力实现的。吸附过程的吸附等温模型符合Langmuir等温式,可以用单分子层吸附理论加以解释。
Polythioether type cotton cellulose （ PTCC） ,a functional material,was synthesized by the etherification of cotton cellulose and chloromethylthiirane in an alkaline medium. The effect of pH on adsorption capacity of PTCC for cationic dyes was investigated. The adsorption kinetics and thermodynamics of cationic dyes on PTCC were studied. The experimental results show that neutral condition favored the adsorption. At 298 K,pH = 7. 0,the adsorption approached to equilibrium in 2 h,the saturated adsorption capacities of PTCC for basic Blue B,basic Blue R and night blue were 726,652 and 320 mg/g,respectively. The adsorption of cationic dyes on PTCC followed the second-order kinetic model,the adsorption rate constant k2 increased with the decrease of temperature,indicating that low temperature favors the adsorption. The negative values of ΔG,ΔH and ΔS suggest that the adsorptions are spontaneous and exothermic processes,which were achieved mainly by Vander Waals force. The adsorption isotherms fit well with the Langmuir equation,which can be explained as a monolayer adsorption.
出处
《应用化学》
CAS
CSCD
北大核心
2010年第7期817-822,共6页
Chinese Journal of Applied Chemistry
基金
上海市科技支撑计划项目(09230500300)
关键词
聚硫醚纤维素
阳离子染料
吸附
热力学
动力学
polythioether type cotton cellulose
cationic dyes
adsorption
thermodynamics
kinetics
