不同尺寸氧化石墨烯的制备及其对亚甲基蓝的吸附行为

Preparation of different sizes of graphene oxide and its adsorption behavior for methylene blue

围绕当前水体污染处理的研究热点,结合氧化石墨烯(GO)优异的吸附性能,以水体中的亚甲基蓝(MB)为分析对象,研究GO的尺寸大小对MB去除的影响。采用不同超声功率制备四种不同尺寸大小的GO,采用多种手段分析GO的片层大小。通过静态实验分别考察不同尺寸大小的GO对在不同的pH、时间和初始浓度下对MB的吸附效率和吸附容量的影响。此外,通过吸附等温线模型探究GO对MB的理论吸附机制,并通过多种表征手段验证其吸附机理。实验结果表明:通过调节超声功率可以获得不同尺寸的GO;GO对MB的吸附不受GO尺寸大小的影响;两者的吸附属于物理吸附。

Focusing on the current research focus of water pollution treatment,combined with the excellent adsorption performance of GO,methylene blue(MB)in water was taken as the analysis object to study the effect of GO size on MB removal.Four kinds of GO with different sizes were prepared by different ultrasonic powers,and analyzed by various means.The effects of different sizes of GO on the adsorption efficiency and capacity of MB at different pH,time and initial concentration were investigated through static experiments.Additionally,the theoretical adsorption mechanism of GO was explored by adsorption isotherm models,and was verified by various characterization methods.The results showed that different sizes of GO could be obtained by adjusting the ultrasonic power,and the adsorption of GO to MB was not affected by the size of GO.The adsorption between GO and MB belonged to physical adsorption.