摘要
目的研究壳聚糖(CTS)和壳聚糖膜(Cd2+-CTS)对Cd2+的吸附性能。方法研究了不同时间、不同温度、不同Cd2+初始浓度下,CTS和Cd2+-CTS对Cd2+吸附率和吸附量的影响;同时,比较了CTS和Cd2+-CTS对Cd2+的吸附能力。结果吸附速率开始时较快,1h后,显著变慢,最终,吸附量和吸附率都趋于平衡;随着温度的升高,吸附量和吸附率均上升,且在同一温度下,Cd2+-CTS的吸附量、吸附率均大于CTS。在室温、溶液的pH值为12、Cd2+浓度为10～40mg/L时,得到CTS及Cd2+-CTS对Cd2+的吸附等温方程为:c0/Q1=0.0197c0+0.0046;c0/Q2=0.0183c0+0.0065(c0为溶液中Cd2+的初始浓度;Q1、Q2分别为CTS及Cd2+-CTS对Cd2+的吸附量)。两方程拟合的相关系数均为0.9998。CTS和Cd2+-CTS对Cd2+的理论饱和吸附量分别为52.8、57.8mmol/L,其与本次实验在30℃时所得到的CTS及Cd2+-CTS对Cd2+的饱和吸附量(分别为53.5、57.0mmol/L)基本吻合。结论CTS和Cd2+-CTS对Cd2+的吸附均符合Langmuir等温方程,且Cd2+-CTS的吸附能力较CTS高。
Objective To study the adsorption ability of the chitosan and the chitosan film to Cd^2＋. Methods Under the given condition,different time and different temperature and different beginning concentration of Cd^2＋, the adsorption rate and capability of the chitosan and the chitosan film were studied. Results The chitosan （or chitosan film） could adsorb Cd^2＋ quickly at first, however, an hour later, the adsorption rate declined slowly. Adsorption rate increased as the temperature increases. There was significant connection between the beginning concentration of Cd2 ＋ and the adsorption rate and capability of the chitosan （or chitosan film）. The adsorption rate of the chitosan （or chitosan film） even reached above 80% when the beginning concentration of Cd^2＋ was no more than 20 mg/L, whereas the adsorption rate and capability of the chitosan （or chitosan film） declined slowly when enhanced the beginning concentration of Cd^2＋. The adsorption rate and capability of the chitosan （or chitosan film） obtained a maximum only when the beginning concentration of Cd^2＋ was about 10 mg/L. The adsorptive ability of the chitosan film to Cd^2＋ was stronger than that of chitosan under the same condition. Conclusion The biosorption of the chitosan （or chitosan film） to Cd^2＋ fits the Langmuir equation and the adsorbability to Cd^2＋ of the cbitosan film is stronger compared with cbitosanb.
出处
《环境与健康杂志》
CAS
CSCD
北大核心
2007年第6期393-395,共3页
Journal of Environment and Health
基金
安徽省教育厅自然科学基金重点项目(2003kj008zd)
关键词
镉
壳聚糖
吸附
Cadmium
Cbitosan
Adsorption
