Hierarchical Microspheres of MoS2 Nanosheets: Efficient and Regenerative Adsorbent for Removal of Water-Soluble Dyes

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• 作者：Anushka Tina Massey ; Rashi Gusain ; Sangita Kumari ; Om P. Khatri
• 刊名：Industrial & Engineering Chemistry Research
• 出版年：2016
• 出版时间：July 6, 2016
• 年：2016
• 卷：55
• 期：26
• 页码：7124-7131
• 全文大小：611K
• 年卷期：0
• ISSN：1520-5045

文摘

This study demonstrates fast and efficient removal of dyes from the wastewater using nanostructural MoS₂ as a regenerative adsorbent. The hierarchical microspheres of MoS₂ nanosheets were prepared by a one-step facile and scalable hydrothermal route using polyethylene glycol as a templating material. Chemical and morphological features of hierarchical microspheres of MoS₂ nanosheets were examined by XPS, FTIR, XRD, FESEM, and HRTEM. The adsorption of a series of organic dyes using MoS₂ nanosheets was systematically investigated. The kinetic study illustrated that adsorption of methylene blue dye onto the MoS₂ nanosheets followed the pseudo-second-order model. The adsorption isotherm at the equilibrium was supported by the Freundlich model. The hierarchical microspheres of MoS₂ nanosheets showed adsorption capacity as high as 297, 204, 216, 183, 146 mg g^–1 for methylene blue, malachite green, rhodamine 6G, fuchsin acid, and congo red dyes, respectively. The high adsorption capacity was attributed to the hierarchical arrangement of MoS₂ nanosheets in the microscopic spheres, where dye molecules have very fast accessibility. Importantly, the hierarchical microspheres of MoS₂ nanosheets can be efficiently regenerated and reused for the dye adsorption of subsequent batch without compromising the adsorption capacity.