In this study, we report for the first time few-layered MoS₂ nanosheets grown onto graphene dipped cellulose filter paper (M-G-CFP) using a simple hydrothermal method towards efficient adsorption of cationic methylene blue (MB) dye. Detailed morphological and chemical characterization studies of M-G-CFP are performed using FESEM, TEM, XRD and Raman spectroscopy that reveal micro flower-like MoS₂ grown onto graphene modified paper with few layers of MoS₂ nanosheets and its high purity nature. Due to electrostatic interactions between cationic dye and the anionic adsorbent surface, the hybrid M-G-CFP exhibits ultrafast removal of MB within 2 min with a maximum adsorption capacity of 485.4 mg g⁻¹ which is superior in comparison to other reported MoS₂ based adsorbents. This high adsorption capacity is attributed to large accessible active sites on the surface of the hybrid M-G-CFP structure. The adsorption mechanism of MB dye on the MoS₂ nanosheets are well described using kinetic and isotherm models with the effects of parameters like pH, contact time and temperature. The kinetic and isotherm study reveals that the adsorption of MB dye follows a pseudo-second order model, indicating the chemisorption and Langmuir model of monolayer adsorption, respectively. Furthermore, this hybrid structure can be efficiently reused for subsequent dye adsorption without compromising on its dye removal efficiency suggesting it is a feasible and promising material towards wastewater treatment applications.

中文翻译：

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纤维素纸上可重复使用的，很少层的MoS2纳米片/石墨烯杂化物，可出色地吸附亚甲基蓝染料

在这项研究中，我们首次报告了使用简单的水热方法对阳离子亚甲基蓝（MB）染料进行有效吸附的，生长在石墨烯浸渍的纤维素滤纸（MG-CFP）上的几层MoS ₂纳米片。使用FESEM，TEM，XRD和拉曼光谱对MG-CFP进行了详细的形态和化学表征研究，揭示了微花状的MoS ₂生长在石墨烯改性纸上，几乎没有MoS ₂纳米片层，并且具有高纯度。由于阳离子染料和阴离子吸附剂表面之间的静电相互作用，混合MG-CFP在2分钟内显示MB的超快去除，最大吸附容量为485.4 mg g ^-1与其他已报道的基于MoS ₂的吸附剂相比，它具有优越性。这种高吸附能力归因于混合MG-CFP结构表面上的大量可及的活性位点。MB染料在MoS ₂上的吸附机理使用动力学和等温线模型对纳米片进行了很好的描述，其中包括pH，接触时间和温度等参数的影响。动力学和等温线研究表明，MB染料的吸附遵循伪二级模型，分别表明了单层吸附的化学吸附和Langmuir模型。此外，这种杂化结构可以有效地重新用于后续的染料吸附，而不会影响其染料去除效率，这表明它是用于废水处理应用的可行且有前途的材料。