期刊
JOURNAL OF COLLOID AND INTERFACE SCIENCE
卷 514, 期 -, 页码 715-722出版社
ACADEMIC PRESS INC ELSEVIER SCIENCE
DOI: 10.1016/j.jcis.2017.12.082
关键词
3D MoS2-graphene hydrogel; 2D heterointerfaces; Hg(II) scavenging
资金
- Natural Science Foundation of China [21475018, 21235001]
- Fundamental Research Funds for the Central Universities [N160504010, N141008001]
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 (MoS2)-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 MoS2/rGO ratio, in order to improve the adsorption capacity and selectivity. The 3D MoS2-rGO hydrogel with 70 wt% MoS2 shows high selectivity for Hg(II) ions, with a distribution coefficient value (K-d) of 7.49 x 10(6) mL g(-1) even in the presence of other coexisting ions. More attractively, the free-standing and flexible 3D MoS2-rGO hydrogel can be used as a column-packed device, providing an efficient pathway for the fast removal of 80 mg L-1 Hg(II) within 7 min to achieve a tolerable concentration of < 2 mu g L-1 in 30 mL water with 5 mg of 3D MoS2-rGO hydrogel. Considering that the direct-contact adsorption is more efficient than oscillating adsorption, the 3D MoS2-rGO hydrogel as nanobuilding block shows a promising potential for cleaning the point-of-use water. (C) 2017 Elsevier Inc. All rights reserved.
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