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改性壳聚糖处理污水中Ni(Ⅱ)的效果

Keywords: 壳聚糖,DNS,改性壳聚糖,Ni2+,吸附

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Abstract:

通过丁二酸酐与γ-氨丙基三甲氧基硅烷改性后的纳米SiO2(即可分散的纳米二氧化硅,简称DNS)反应,合成了羧基化的DNS,再经过与壳聚糖脱水生成酰胺的过程,合成了改性壳聚糖。通过红外光谱和扫描电镜对改性壳聚糖进行表征。研究了壳聚糖及改性壳聚糖微粒吸附Ni2+时溶液pH值、时间、吸附剂用量和Ni2+初始浓度等对吸附率的影响,并确定了最佳条件为:pH=7,吸附时间为120min,吸附剂的投加量为0.3g。改性壳聚糖比壳聚糖具有更强的吸附Ni2+的能力,吸附率达67.01%。

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