Hierarchical Microspheres of MoS2 Nanosheets: Efficient and Regenerative Adsorbent for Removal of Water-Soluble Dyes
Hierarchical Microspheres of MoS2 Nanosheets: Efficient and Regenerative Adsorbent for Removal of Water-Soluble Dyes
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DOI：
10.1021/acs.iecr.6b01115
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发表时间：
2016-07-06
影响因子：
4.2
通讯作者：
Khatri, Om P.
中科院分区：
文献类型：
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作者：
Massey, Anushka Tina;Gusain, Rashi;Khatri, Om P.
这项研究表明，使用纳米结构的二硫化钼作为再生吸附剂，从废水中快速有效地去除染料。以聚乙二醇为模板，采用一步水热法制备了MoS 2纳米片的分级微球。采用XPS、FTIR、XRD、FESEM和HRTEM等手段对MoS 2纳米片分级微球的化学和形貌特征进行了研究。系统研究了二硫化钼纳米片对一系列有机染料的吸附性能。动力学研究表明，亚甲基蓝染料在MoS 2纳米片上的吸附符合准二级动力学模型。吸附等温线符合Freundlich模型。MoS 2纳米片的分级微球对亚甲基蓝、孔雀石绿绿色、罗丹明6 G、酸性品红和刚果红染料的吸附容量分别高达297、204、216、183、146 mg g（-1）。高吸附容量归因于MoS 2纳米片在微观球体中的分级排列，其中染料分子具有非常快的可及性。重要的是，分层微球的二硫化钼纳米片可以有效地再生和重复使用的染料吸附的后续批次，而不损害吸附能力。
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.