海藻酸钠基复合材料对铅、镉的吸附性能

Adsorption Capability of Sodium Alginate Composites to Pb^(2+) and Cd^(2+)

以海藻酸钠和氧化石墨烯为前体物、乙二胺四乙酸二钠为表面改性剂,采用不同方法制备了3种功能材料,用于水样中铅、镉的吸附去除。实验对3种材料进行了比表面积、孔径分析和SEM表征,显示材料都为三维网络结构,通过静态吸附法研究了其对铅、镉的吸附去除效果,其中通过冷冻干燥后再进行交联制备的SEG2材料吸附效果最佳,常温下振荡吸附3h对Pb2+和Cd2+的去除率达到了97.44%和97.16%,可以应用于实际废水中Pb2+和Cd2+的处理。

Three adsorbents for Pb^2+ and Cd^2+ in aqueous solutions have been prepared by modifying grapheme oxide/sodium alginate with disodium ethylenediaminetetraacetate in different methods. Specific surface area,pore size analysis and the scanning electron microscope (SEM) pictures show the characteristics of these adsorbents,which indicates that they are all network-like structure. Static adsorption experiments for Pb^2+ and Cd^2+ are carried out. The SA/EDTA/GO2 adsorbent has outstanding adsorption performance which is prepared by blending and vacuum freeze drying. The maximum removing capacity of SA/EDTA/GO2 for Pb^2+ and Cd^2+ are 97.44% and 97.16% respectively at 298K,indicating the potential material for practical application.