摘要
[目的]研究Sr－Fe－壳聚糖磁性纳米微球对亚甲基蓝的吸附效果。[方法]以SrFe12 O19为内核、壳聚糖为外壳，制备了Sr－Fe－壳聚糖磁性纳米微球，将其用于对亚甲基蓝的吸附，并探讨了吸附时间、染料初始浓度、吸附剂投量、pH、温度等对吸附效果的影响。[结果]Sr－Fe－壳聚糖磁性纳米微球吸附过程基本在30 min内完成，且吸附率均达到96．3％；磁球对MB的吸附有较好的pH和温度适应性，在中性偏碱范围内（pH 7～11），25～50℃时，吸附率均保持96．0％以上；染料初始浓度为10～30 mg／L时，磁球吸附率随初始浓度的增加有轻微下降，但仍保持在95．2％以上；在染料初始浓度为30 mg／L时，磁球最佳投量为1．00 g／L，吸附率为97．4％；Sr－Fe－壳聚糖磁性纳米微球对亚甲基蓝的吸附符合Langmuir等温吸附方程，吸附过程符合准二级动力学方程特征。[结论]该研究为染料废水的吸附处理提供了一种新的材料与方法。
Abstract
Objective]The research aimed to study adsorption performance of methylene blue (MB) by Sr-Fe-chitosan magnetic nanoparti-cles.[ Method] Sr-Fe-chitosan magnetic nanospheres were made of SrFe12 O19 as the core and chitosan as the shell.The adsorption study of Sr-Fe-chitosan microspheres for MB was investigated.Effects of adsorption time, dye initial concentration, sorbent dosage, pH and temperature on the adsorption were explored.[ Result] Sr-Fe-chitosan magnetic nanospheres adsorption process was mainly completed in the first 30 min,and the adsorption rate was higher than 96.3%.The magnetic microspheres showed good pH and temperature adapt abilities, in the range of pH=7-11, 25-50 ℃, all the adsorption rate was more than 96.0%.When the initial dye concentration was 10-30 mg/L, the adsorption rate was slightly decreased with the increase of initial MB concentration, but it was still more than 95.2%.When the dye concentration was 30 mg/L, the best dosage was 1.00 g/L, with the corresponding adsorption rate being 97.4%.The adsorption of Sr-Fe-chitosan microspheres was in accordance with the Langmuir adsorption isotherm equation, and the adsorption process followed the characteristics of Pseudo-second-or-der adsorption model.[ Conclusion] This study provides a new material and method for wastewater treatment containing dye.
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