• 文献标题:   Sunlight-assisted tailoring of surface nanostructures on single-layer graphene nanosheets for highly efficient cation capture and high-flux desalination
  • 文献类型:   Article
  • 作  者:   ZHANG L, HU XG, ZHOU QX
  • 作者关键词:  
  • 出版物名称:   CARBON
  • ISSN:   0008-6223 EI 1873-3891
  • 通讯作者地址:   Nankai Univ
  • 被引频次:   1
  • DOI:   10.1016/j.carbon.2020.01.112
  • 出版年:   2020

▎ 摘  要

Highly efficient approaches using nanomaterials for ion capture and desalination have been widely explored to address fresh water scarcity worldwide; however, the complex preparation process and the large-scale and high-density perforation of porous graphene layers remain technical challenges. Herein, we found that sunlight-assisted tailoring of surface nanostructures involving controllable morphological and structural alterations of graphene unequivocally improved the ion adsorption and ion filtration performance. Notably, the interlayer spacing of single-layer graphene could be sufficiently tuned via lighting control to promote selective interactions between ions and nanosheets. After 7 d simulated sunlight treatment, the transformed SLG (SLG-S-7) exhibited 86.1%, 77.3% and 46.1% increases of adsorption capacity for Na+, Pb2+ and Fe3+ in the complex ion system, respectively. Notably, the adsorption capacity of SLG-S-7 for single Pb2+ was even 2.3-fold greater than that of pristine SLG. Further, the layer-stacked SLG-S-7 membrane achieved super water fluxes (167.1 L m(-2) h(-1) bar(-1)) and a high separation performance without sacrificing salt ion rejection, which was attributed to the sunlight-induced larger water transport channels and defect-free nanosheets in the membrane. This work provides new insight for the design of novel graphene-based nanostructures to address the increasingly serious water contamination issue and the scarcity of fresh water. (C) 2020 Elsevier Ltd. All rights reserved.