摘要
选用柠檬酸修饰高粱秸秆为新型吸附剂,用于去除水溶液中的阳离子染料结晶紫.讨论了吸附时间、染料浓度及pH等因素对溶液中结晶紫去除率的影响.实验结果显示,该吸附剂对阳离子染料结晶紫具有较好的吸附性能及较高的吸附效率.对于质量浓度为400 mg/L的结晶紫溶液,在8 h之内即可将溶液中的结晶紫基本吸附完全,染料去除率达到99%以上.吸附动力学研究表明,该吸附剂对不同浓度的结晶紫染料的吸附过程皆符合准二级动力学方程.吸附等温线Langmuir方程和Freundlich方程拟合结果显示,该吸附更加符合表明以单分子形式进行吸附的Langmiur方程,柠檬酸修饰高粱秸秆对结晶紫的最大吸附量达到518.13mg/g.
The new adsorbent citic acid-modified grain sorghum stalk was used to remove cationic dyes crystal violet（CV） from aqueous solution.The effects of various experimental parameters（e.g.contact time,initial concentration of dye and pH etc.）were examined on a batch sorption basis.The experiments results showed that this adsorbent exhibited high sorption capacities and high efficiency toward crystal violet.The adsorption equilibrium could reach within 8h and the removal ratio of crystal violet was more than 99% as the dye concentration was 400 mg/L.The adsorption kinetics showed that the adsorption process for various concentration dye all can be better described by the pseudo-second-order model.The experimental sorption equilibrium data were better fitted by Langmuir（R20.999） than Freundlich isotherm,confirming that the adsorption of crystal violet on citic acid-modified grain sorghum stalk was in the form of monolayer.The maximum adsorption capacity of crystal violet was 518.13 mg/g.
出处
《武汉工程大学学报》
CAS
2010年第12期47-51,共5页
Journal of Wuhan Institute of Technology
关键词
高粱秸秆
柠檬酸
修饰
染料
结晶紫
吸附
grain sorghum stalk
critic acid
modification
dye
crystal violet
adsorption
