Research Center for Analytical Sciences, Department of Chemistry, College of Sciences, Northeastern University, Box 332, Shenyang 110819, China.
Research Center for Analytical Sciences, Department of Chemistry, College of Sciences, Northeastern University, Box 332, Shenyang 110819, China.
J Colloid Interface Sci. 2018 Mar 15;514:715-722. doi: 10.1016/j.jcis.2017.12.082. Epub 2017 Dec 29.
A hierarchical and hybridized hydrogel with rational structure and composition as adsorbent possesses a series of distinct advantages, e.g., fast ion diffusion, high selectivity and good stability. Herein, a novel three-dimensional (3D) molybdenum disulfide (MoS)-reduced graphene oxide (rGO) hydrogel with two-dimensional heterointerfaces is fabricated by an eco-friendly one-pot hydrothermal method. The heterointerfacial area could be readily tuned by the regulation of MoS/rGO ratio, in order to improve the adsorption capacity and selectivity. The 3D MoS-rGO hydrogel with 70 wt% MoS shows high selectivity for Hg(II) ions, with a distribution coefficient value (K) of 7.49 × 10 mL g even in the presence of other coexisting ions. More attractively, the free-standing and flexible 3D MoS-rGO hydrogel can be used as a column-packed device, providing an efficient pathway for the fast removal of 80 mg L Hg(II) within 7 min to achieve a tolerable concentration of < 2 μg L in 30 mL water with 5 mg of 3D MoS-rGO hydrogel. Considering that the direct-contact adsorption is more efficient than oscillating adsorption, the 3D MoS-rGO hydrogel as nanobuilding block shows a promising potential for cleaning the point-of-use water.
一种具有合理结构和组成的分层杂化水凝胶作为吸附剂具有一系列独特的优势，例如快速离子扩散、高选择性和良好的稳定性。本文通过一种环保的一锅水热法制备了一种具有二维异质界面的新型三维二硫化钼（MoS）-还原氧化石墨烯（rGO）水凝胶。通过调节 MoS/rGO 比，可以很容易地调整异质界面面积，以提高吸附容量和选择性。在 70wt% MoS 的 3D MoS-rGO 水凝胶中，Hg(II)离子的选择性很高，分配系数（K）值为 7.49×10 mL g，即使存在其他共存离子也是如此。更吸引人的是，独立式和灵活的 3D MoS-rGO 水凝胶可用作柱填充装置，为快速去除 7 min 内 30 mL 水中的 80 mg/L Hg(II)提供了有效的途径，用 5 mg 3D MoS-rGO 水凝胶将浓度降低到可容忍的 <2μg/L。考虑到直接接触吸附比振荡吸附更有效，作为纳米构建块的 3D MoS-rGO 水凝胶显示出在现场用水净化方面具有广阔的应用前景。
