Omar Asmaa M, Metwalli Ossama I, Saber Mohamed R, Khabiri Gomaa, Ali Mohamed E M, Hassen Arafa, Khalil Mostafa M H, Maarouf Ahmed A, Khalil Ahmed S G
Environmental and Smart Technology Group (ESTG), Physics Department, Faculty of Science, Fayoum University 63514 Fayoum Egypt
Chemistry Department, Faculty of Science, Fayoum University 63514 Fayoum Egypt.
RSC Adv. 2019 Sep 9;9(49):28345-28356. doi: 10.1039/c9ra05427h.
Herein, different phases of MoS nanosheets were synthesized, characterized and tested for dye removal from water. The influence of the MoS phases as well as the 1T concentration on the adsorption performance of organic dyes MO, RhB and MB was deeply investigated. The results revealed that the 1T-rich MoS nanosheets have superior adsorption performance compared to other 2H and 3R phases. The kinetic results of the adsorption process demonstrate that the experimental data followed the pseudo-second order equation. Meanwhile, the adsorption of dyes over the obtained materials was fitted with several isotherm models. The Langmuir model gives the best fitting to the experimental data with maximum a adsorption capacity of 787 mg g. The obtained capacity is significantly higher than that of all previous reports for similar MoS materials. Computational studies of the 2H and 1T/2H-MoS phases showed that the structural defects present at the 1T/2H grain boundaries enhance the binding of hydroxide and carboxyl groups to the MoS surface which in turn increase the adsorption properties of the 1T/2H-MoS phase.
在此，合成了不同相的MoS纳米片，对其进行了表征，并测试了其从水中去除染料的性能。深入研究了MoS相以及1T浓度对有机染料MO、RhB和MB吸附性能的影响。结果表明，富含1T的MoS纳米片比其他2H和3R相具有更优异的吸附性能。吸附过程的动力学结果表明，实验数据符合准二级方程。同时，用几种等温线模型对所得材料上染料的吸附进行了拟合。Langmuir模型对实验数据拟合最佳，最大吸附容量为787 mg/g。所得容量显著高于之前所有关于类似MoS材料的报道。对2H和1T/2H-MoS相的计算研究表明，1T/2H晶界处存在的结构缺陷增强了羟基和羧基与MoS表面的结合，进而提高了1T/2H-MoS相的吸附性能。
