锆改性壳聚糖制备的优化及饮水除氟效果
发布时间：2018-10-18 20:34
【摘要】：目的研制锆改性壳聚糖吸附剂用于除去水中的氟离子。方法取1.00 g壳聚糖,溶于60 ml的5%乙酸溶液,按锆与壳聚糖质量比为3∶20加入氧氯化锆溶液,搅拌反应60 min,然后滴加25%~28%氨水使改性壳聚糖完全析出,过滤、洗涤、70℃烘干,制得锆改性壳聚糖吸附剂。采用该吸附剂对8.95 mg/L含氟水样进行静态除氟实验(适宜条件为:pH 3~9,140 r/min振荡速度下于室温吸附120 min)。并拟合Langmuir吸附等温线和二级动力学方程。结果吸附剂用量为1.0 g/L时,除氟率在90.7%,平衡吸附量为8.12 mg/g。拟合Langmuir吸附等温线(30℃)方程的R2=0.999 4,最大吸附量为12.30 mg/g,吸附平衡常数为1.58 L/mg。拟合二级动力学方程的R2值为1。结论锆改性壳聚糖对高氟水吸附容量大,除氟效率高。
[Abstract]:Objective to prepare zirconium modified chitosan adsorbent for removing fluoride ions in water. Methods 1.00g chitosan, dissolved in 5% acetic acid solution for 60 ml, was added into zirconium oxychloride solution at 3:20, stirred for 60 min, and then dripped with 25% 28% ammonia water to separate, filter, wash and dry the modified chitosan at 70 鈩，
本文编号：2280296
[Abstract]:Objective to prepare zirconium modified chitosan adsorbent for removing fluoride ions in water. Methods 1.00g chitosan, dissolved in 5% acetic acid solution for 60 ml, was added into zirconium oxychloride solution at 3:20, stirred for 60 min, and then dripped with 25% 28% ammonia water to separate, filter, wash and dry the modified chitosan at 70 鈩，
本文编号：2280296
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