氨基壳聚糖吸附材料对重金属和抗生素吸附性能研究

Study on the adsorption properties of amino chitosan adsorbents for the removal of heavy metals and antibiotics

以壳聚糖为基体,制备氨基壳聚糖吸附材料(CN)。通过SEM、EA、FTIR、XPS等对其结构进行表征,研究了CN对单一重金属、抗生素及重金属-复合污染物的吸附性能。结果表明,在pH=5时,相较于Zn(II)、Cd(II),CN对Cu(II)的吸附量最高,可达0.84 mmol/g;相较于CIP、TC,CN对SMZ的吸附量最高,可达0.404 mmol/g。对于重金属-抗生素复合污染物,同时存在两种相互作用,低浓度时,桥联作用占主导;高浓度时,竞争作用占主导。

An amino functionalized chitosan adsorption material(CN)was facilely prepared.The structure was characterized by SEM,EA,FTIR and XPS.At pH=5,the capacity of Cu(II)was the highest,reaching 0.84 mmol/g,compared with the ones of Zn(II)and Cd(II).Similarly,CN has the highest adsorption capacity for SMZ,attaining to 0.404 mmol/g.For the heavy metal-antibiotic complex pollutants,there are two kinds of interaction.At a low concentration,the bridging effect is dominant,while at a high concentration,the effect is mainly competition.