氧化石墨烯/海藻酸钙复合薄膜对亚甲基蓝的吸附性能研究

Studies of the Adsorption Properties of Methylene Blue on Graphene Oxide/Calcium Alginate Composite Membranes

摘要: 利用冷冻干燥法制备了纯海藻酸钙(CA)和氧化石墨烯/海藻酸钙(GO/CA)复合薄膜材料。采用扫描电子显微镜和傅里叶变换红外光谱仪对材料的表面形貌和化学特性进行表征。研究了GO与CA重量百分比、接触时间、吸附剂加入量、温度和溶液pH等实验参数对GO/CA薄膜吸附亚甲基蓝(MB)的影响。实验结果表明：GO的加入有助于提高复合材料的吸附容量，GO的重量百分比为20%时，复合薄膜对MB的吸附容量达到187.5 mg/g，吸附平衡时间大约为600 min，随着吸附剂加入量从5增加到35 mg，MB的去除率由87.1%增至99.1%，说明GO/CA薄膜是一种良好的MB吸附材料。

Abstract: Pure calcium alginate (CA) and graphene oxide/calcium alginate (GO/CA) composite membranes were prepared by a freeze-drying method. Their surface morphology and chemical properties were characterized by scanning electron microscope and Fourier transform infrared spectroscopy. The effects of experimental parameters, such as weight percentage of GO and CA, contact time, adsorbent dosage, temperature, and solution pH on the adsorption methylene blue (MB) onto GO/CA membranes were studied. The experimental results showed that the adsorption capacity of the composite was improved by adding GO. When the weight percentage of GO was 20%, the adsorption capacity of the composite membrane to MB was 187.5 mg/g, the adsorption equilibrium time was about 600 min, and the dye removal rate increased from 87.1% to 99.1% with increasing of the amount of adsorbent dosage from 5 to 35 mg, indicating that the GO/CA membrane is a good MB adsorption material.