壳聚糖载纳米氧化铁颗粒吸附剂的配比优选与除磷性能

Proportion Optimization and Phosphate Removal Performance of Nano-Iron Oxide Impregnated Chitosan Beads

为降低水中磷的浓度,减少水体富营养化,对新型除磷吸附剂--壳聚糖载纳米氧化铁(CNFeOOH)的Fe(Ⅲ)/壳聚糖单体的摩尔配比R进行了优选试验,并对最优材料的除磷性能进行了研究,结果表明:在R=0~4.8的6种配比材料中,R=4.8的CNFeOOH吸附剂除磷效率最高.等温线数据分析表明最大吸附量为42.06 mg/g(pH=7,T=30℃),且更符合Freundlich方程,说明此过程主要为多分子层吸附;动力学吸附过程符合拟二级动力学模型,说明该吸附过程主要为化学吸附;对吸附剂进行4次吸附再生实验,发现CNFeOOH再生性能良好.

In order to reduce the concentration of phosphate in water so as to reduce the eutrophication,the molar proportion R of Fe(Ⅲ)/chitosan monomer on chitosan-loaded nano-iron oxide(CNFeOOH),the novel phosphate removal adsorbent,was optimized and the phosphate removal performance of the optimal material was investigated. The results showed that among the six ratiometric materials with R=0~4.8,the CNFeOOH adsorbent with R =4.8 had the highest phosphate removal efficiency. The analysis about isotherm data indicated that the maximum adsorption capacity was 42.06 mg/g(pH=7,T=30℃).The Freundlich equation could describe the adsorption isotherm better,indicating the process was multi-molecular layer adsorption. The adsorption kinetics was fitted by the pseudo-second order model better,indicating that the adsorption process was mainly chemical adsorption. The adsorption regeneration experiment of the adsorbent was carried out four times,and the regeneration performance of CNFeOOH was good.