CAJ | 학술논문

以石墨粉为原料按Hummers氧化法制备氧化石墨,借助X射线衍射仪(XRD)、扫描电子显微镜(SEM)、透射电子显微镜(TEM)、傅里叶变换红外光谱法(FTIR)和低温氮吸附-脱附对氧化石墨的结构和形貌进行了表征.结果表明,氧化石墨是不平整的、具有一定层状结构的褶皱片状,在其表面存在着许多含氧的官能团如:环氧基、羟基、羧基.此外还研究了氧化石墨对阳离子染料的吸附性能,结果表明:吸附过程的等温模型符合Langmuir等温式,对甲基紫、甲基绿、中性红这3种阳离子染料的最大饱和吸附量分别为:741,446和368 mg· g-1；对阳离子染料的吸附过程符合二级动力学方程.氧化石墨作为一种吸附剂能有效的去除阳离子染料与其较高的比表面积和与阳离子染料的静电吸引有关.
이석묵분위원료안Hummers양화법제비양화석묵,차조X사선연사의(XRD)、소묘전자현미경(SEM)、투사전자현미경(TEM)、부리협변환홍외광보법(FTIR)화저온담흡부-탈부대양화석묵적결구화형모진행료표정.결과표명,양화석묵시불평정적、구유일정층상결구적습추편상,재기표면존재착허다함양적관능단여:배양기、간기、최기.차외환연구료양화석묵대양리자염료적흡부성능,결과표명:흡부과정적등온모형부합Langmuir등온식,대갑기자、갑기록、중성홍저3충양리자염료적최대포화흡부량분별위:741,446화368 mg· g-1；대양리자염료적흡부과정부합이급동역학방정.양화석묵작위일충흡부제능유효적거제양리자염료여기교고적비표면적화여양리자염료적정전흡인유관.
This study reports the preparation of Graphite oxide (GO) and GO as an adsorbent for removal of cationic dyes.GO was synthesized by the oxidation of graphite through the modied Hummers approach.The structure of GO was characterized by XRD,TEM,SEM,FTIR and N2 adsorption.The results show that GO is a uneven wrinkled flake with certain layer structure and a large quantities of oxygen-containing fuctional groups exists in the form of epoxy,hydroxyl,and carboxyl groups on the surface of GO.In addition,GO has a good capability towards cationic dyes adsorption.The Langmuirian maximum adsorption capacities of GO are 741 mg·g-1 for methyl violet,446 mg·g-1 for methyl green and 368 mg·g-1 for neutral red.The adsorption processes follow the pseudosecond-order kinetics model.GO could be used potentially as an effective adsorbent for removal of cationic dyes from aqueous solution possibly due to its electrostatic attraction and large specific surface area.