利用水滑石类层柱化合物(LDHs)处理重金属阳离子污染物,目前国内研究尚少.选用具有生物安全性的壳聚糖为改性剂,通过自组装共沉淀反应和表面修饰技术使其与水滑石基体形成超分子体系,制备出具有强螯合性能的低聚壳聚糖-水滑石(COS-LDHs).实验表明,经少量COS-LDHs处理1.5h后,水溶液中pb2+的质量浓度从5mg/L降到2μg/L以下;XRD、XPS、FT-IR、TG-DTA、BET、TEM等表征说明COS-LDHs在自组装过程中结晶良好、层间结构稳定、比表面积增加且改性分子与基体的复合良好.
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