聚丙烯酰胺辅助水热法制备碳纳米球及其亚甲基蓝吸附特性

Preparation of polyacrylamide-assisted hydrothermal carbon nanospheres and adsorption of methylene blue

以葡萄糖,阴离子型聚丙烯酰胺(APAM)为原料,通过辅助水热法制备了不同APAM加入量的单分散碳纳米球(CNs-APAM)。利用SEM、FTIR、XRD、TG、紫外可见分光光度计(UV-vis)对样品进行了表征与测试。考察了APAM添加量对碳纳米球(CNs)分散性及产率的影响,及不同APAM添加量的CNs对亚甲基蓝(MB)吸附性能。研究显示APAM的添加量在120 mg时,CNs分散性最佳,收率最高,产率高达21.5%。吸附结果表明,当APAM的加入量为120 mg,吸附时间约2 h,MB溶液浓度为30 mg/L,溶液初始pH为10.0时,CNs-APAM在MB上具有最佳吸附效果,最大吸附量为124.26 mg•g^(-1)。吸附模型的拟合结果表明,CNs-APAM吸附MB过程符合Langmuir模型与准二级动力学模型。

Monodisperse carbon nanospheres(CNs-APAM)with different APAM incorporation amounts were prepared by an assisted hydrothermal method using glucose,anionic polyacrylamide(APAM)as raw material.The samples were characterized and tested using SEM,FTIR,XRD,TG,and ultraviolet-visible spectrophotometer(UV-vis).The effects of APAM addition on the dispersion and yield of carbon nanospheres(CNs)and the adsorption performance of CNs on methylene blue(MB)with different APAM additions were investigated.It was shown that the best dispersion and highest yield of CNs were achieved at the addition of APAM at 120 mg,with the yield up to 21.5%.The adsorption results showed that CNs-APAM had the best adsorption effect on MB with the maximum adsorption amount of 124.26 mg•g^(-1) when the addition amount of APAM was 120 mg,the adsorption time was about 2 h,the concentration of MB solution was 30 mg/L,and the initial pH of the solution was 10.0.The fitting results of the adsorption model showed that the process of MB adsorption by CNs-APAM was consistent with Langmuir model with quasi-secondary kinetic model.