铜离子印迹磁性复合吸附剂的制备

Preparation of Cu (Ⅱ) ion imprinted magnetic composite adsorbent

为了有效地提高废水中吸附剂对铜离子的吸附性能,降低重金属离子对水体的污染,以Cu(Ⅱ)为印迹离子,壳聚糖为印迹母体材料,青霉属菌丝体为核心,纳米Fe3O4为磁组分,制备了铜离子印迹磁性复合吸附剂(Cu(Ⅱ)-IMB).研究了复合吸附剂的制备方法及制备条件与Cu(Ⅱ)吸附性能的关系,并通过响应面分析法(Response Surface Methodology,RSM)优化确定了复合吸附剂制备的最佳工艺条件.实验表明,以硫酸铜中Cu(Ⅱ)为印迹模板,2g菌丝体/0.2gCS,交联剂环氧氯丙烷加入2.99g,Fe3O4加入0.505g,印迹铜离子质量为25.245mg时,所制备Cu(Ⅱ)-IMB对铜离子去除率达82.85%(质量分数),吸附容量33.8mg/g,可重复使用5次以上.用铜离子印迹磁性复合吸附剂物理吸附方法去除水体中重金属离子成本低廉,磁性回收方便,选择吸附性能好、无污染,在废水处理中具有广阔的应用前景.

In order to improve the selective adsorption of adsorbent for Cu（Ⅱ） ion and reduce the heavy metal ion pollution in wastewater, a Cu（Ⅱ） ion imprinted magnetic composite adsorbent （Cu（Ⅱ） -IMB） was synthesized by using Cu （Ⅱ） as imprinted ion, chitosan （CS） as imprinted matrix, fungal mycelium as core, nano-Fe3O4 as magnetic component. Effects of prepared conditions and ways on Cu（Ⅱ） ion adsorption were studied and the optimal prepared conditions were determined by response surface methodology in order to get the best adsorption capacity of Cu （Ⅱ） - IMB. Results show that using Cu （Ⅱ） of CuSO4 as imprinted template, 2g mycelium/0. 2g CS, 2.99g ECH, 0. 505g Fe3Oaand 25. 245mg imprinted Cu（Ⅱ）, the Cu（Ⅱ） - IMB with high adsorption capacity of 82. 85% and Cu（Ⅱ） removal rate of 33.8 mg/g can be obtained. Cu （Ⅱ） -IMB is low cost and can be recycled more than five times easily. It has high selective adsorption for imprinted Cu（Ⅱ） and has a good application prospect.