Wan Ngah W S, Hanafiah M A K M, Yong S S
School of Chemical Sciences, Universiti Sains Malaysia, 11800 Penang, Malaysia.
Colloids Surf B Biointerfaces. 2008 Aug 1;65(1):18-24. doi: 10.1016/j.colsurfb.2008.02.007. Epub 2008 Feb 17.
The adsorption of humic acid on crosslinked chitosan-epichlorohydrin (chitosan-ECH) beads was investigated. Chitosan-ECH beads were characterized by Fourier transform infrared spectroscopy (FTIR), surface area and pore size analyses, and scanning electron microscopy (SEM). Batch adsorption experiments were carried out and optimum humic acid adsorption on chitosan-ECH beads occurred at pH 6.0, agitation rate of 300 rpm and contact time of 50 min. Adsorption equilibrium isotherms were analyzed by Langmuir and Freundlich models. Freundlich model was found to show the best fit for experimental data while the maximum adsorption capacity determined from Langmuir model was 44.84 mg g(-1). The adsorption of humic acid on chitosan-ECH beads was best described with pseudo-first-order kinetic model. For desorption study, more than 60% of humic acid could be desorbed from the adsorbent using 1.0M HCl for 180 min.
研究了腐殖酸在交联壳聚糖-环氧氯丙烷（壳聚糖-ECH）珠粒上的吸附情况。通过傅里叶变换红外光谱（FTIR）、表面积和孔径分析以及扫描电子显微镜（SEM）对壳聚糖-ECH珠粒进行了表征。进行了批量吸附实验，壳聚糖-ECH珠粒对腐殖酸的最佳吸附发生在pH 6.0、搅拌速率300 rpm和接触时间50分钟时。用朗缪尔和弗伦德利希模型分析了吸附平衡等温线。发现弗伦德利希模型对实验数据拟合最佳，而由朗缪尔模型确定的最大吸附容量为44.84 mg g(-1)。腐殖酸在壳聚糖-ECH珠粒上的吸附用拟一级动力学模型描述最佳。对于解吸研究，使用1.0M HCl处理180分钟，超过60%的腐殖酸可从吸附剂上解吸下来。
