Data for: Rapid adsorption of cationic dye-methylene blue on the modified montmorillonite/graphene oxide composites

Composite structure of montmorillonites（Mt）with graphene oxide (GO) or reduced graphene oxide (rGO) was successfully synthesized by grafting with 3-aminopropyl triethoxysilane (APTES) and hydrazine hydrate reduction. XRD, BET, FTIR, SEM and XPS analysis were used to characterize the surface and structure properties of the as-obtained products. Measurement results suggest that these two composites are similar in morphology and pore structure, but significantly different in the surface oxygenic groups. Adsorption properties of the Mt/GO and Mt/rGO were investigated using methylene blue (MB) as the target material. Compare to original Mt, APTES modified Mt and Mt/rGO, Mt/GO exhibited the highest adsorption capacity of 641.1 mg/g at the initial concentration of 750 mg/L, and MB was removed by 94.3% within 5min. Mechanism analysis suggested that the high absorption performance of the composite was determined by the high specific surface area, oxygenic groups of GO, high adsorption capacity of montmorillonite as well as the synergistic effect between the Mt and graphene oxide nanosheets.

本研究通过3-氨丙基三乙氧基硅烷（3-aminopropyl triethoxysilane, APTES）接枝并经水合肼还原，成功合成了蒙脱石（montmorillonites, Mt）与氧化石墨烯（graphene oxide, GO）或还原氧化石墨烯（reduced graphene oxide, rGO）的复合结构。采用X射线衍射（X-ray Diffraction, XRD）、布鲁诺尔-埃米特-泰勒比表面积分析法（Brunauer-Emmett-Teller, BET）、傅里叶变换红外光谱（Fourier Transform Infrared Spectroscopy, FTIR）、扫描电子显微镜（Scanning Electron Microscope, SEM）及X射线光电子能谱（X-ray Photoelectron Spectroscopy, XPS）对所制得产物的表面与结构性质进行了表征。测试结果表明，这两种复合物在形貌与孔隙结构上较为相似，但表面含氧基团存在显著差异。以亚甲基蓝（methylene blue, MB）为目标吸附质，考察了Mt/GO与Mt/rGO的吸附性能。相较于原始蒙脱石、APTES改性蒙脱石以及Mt/rGO，Mt/GO在初始浓度为750 mg/L时展现出最高的吸附容量，达641.1 mg/g，且可在5分钟内去除94.3%的亚甲基蓝。机理分析表明，该复合物的优异吸附性能由高比表面积、氧化石墨烯的含氧基团、蒙脱石本身的高吸附容量以及蒙脱石与氧化石墨烯纳米片之间的协同效应共同决定。