西瓜皮基碳气凝胶的制备及其吸附性能

以西瓜皮为碳源,通过水热处理结合冷冻干燥法制备了碳气凝胶。采用FTIR、拉曼光谱、XPS和SEM等技术对碳气凝胶的表面基团、形貌和结构进行了表征。考察了碳气凝胶对罗丹明B和孔雀石绿模拟染料废水的吸附性能。表征结果显示,碳气凝胶呈现典型的三维无序网状多孔结构,其表面存在大量的羟基、羰基、羧基等官能团。实验结果表明,在罗丹明B或孔雀石绿初始质量浓度为10 mg/L、碳气凝胶加入量为0.5 g/L、吸附温度为常温、初始废水p H为染料废水自然酸碱度、吸附时间为1 h的条件下,碳气凝胶对孔雀石绿的去除率为92.7%,对罗丹明B的去除率为67.2%;循环使用4次到6次,罗丹明B和孔雀石绿的去除率略有降低。

Preparation of carbon aerogel from watermelon peel and its adsorption properties

The carbon aerogel was synthesized by hydrothermal treatment and freeze-drying method using watermelon peel as carbon source and characterized by FTIR,Raman spectroscopy(Raman),XPS and SEM. The adsorption capabilities of carbon aerogel to Rhodamine B and malachite green in the simulated wastewater were studied. The characterization results show that the carbon aerogel presents a typical three-dimensional disordered reticulated porous structure,and there are plenty of functional groups such as hydroxyl,carbonyl,carboxyl,etc on the surface of the carbon aerogel. The experimental results show that under the conditions of Rhodamine B or malachite green mass concentration 10 mg/L,carbon aerogel dosage 0.5 g/L,room temperature,nature pH and adsorption time 1 h,the removal rates of Rhodamine B and malachite green are 92.7% and 67.2%,respectively;After 4-6 times of reuse,the removal rate of Rhodamine B and malachite green are decreased slightly.