Nanosheet-based magadiite: a controllable two-dimensional trap for selective capture of heavy metals. Issue 28 (28th June 2018)

• Record Type: Journal Article
• Authors: Ding, He; Chen, Yang; Fu, Tianyi; Bai, Peng; Guo, Xianghai
• Is Part Of: Journal of materials chemistry. Volume 6:Issue 28(2018)
• Page Start: 13624
• Page End: 13632
• Publication Date: 2018-06-28
• Subjects: Materials -- Research -- Periodicals; Chemistry, Analytic -- Periodicals; Environmental sciences -- Research -- Periodicals; 543.0284
• DOI: 10.1039/c8ta04790a
• Languages: English
• ISSNs: 2050-7488

Abstract

Abstract : Nanosheet-based magadiites are promising adsorbents with controlled interlayer space and a well-defined 2D structure, which make them new candidates for heavy metal removal. Abstract : Long-chain imidazolium-based surfactants are assembled cooperatively with silicate clathrate anions to generate magadiite nanosheets, where the imidazole acts as a structure-directing agent for specific structures, while the surfactant tails regulate the distance of layers. Four different tails are selected among linear alkyl chains (C n H2 n +1, n = 12, 16, 18, 22) to evaluate structure-directing effects with the formula of [ tail -N + C5 H8 N]Br − . The well-crystallized nanosheet-based magadiites with controllable 2-dimensional rectangular layered structure are reported for the first time. The adsorption performances of these materials are investigated by removal of heavy metals, including Cu(ii ), Zn(ii ), Pb(ii ) and Cd(ii ). These materials manifest high adsorption capacity and different selectivities, especially for Cu(ii ) and Pb(ii ). The space and assembly of interlayers as well as the properties of heavy metals determine the removal efficiency and selectivity. Through a controllable interface, the as-synthesized samples could overcome the diffusion limit with enhanced selectivity and adsorption capacity, compared to conventional rosette-like magadiites. Nanosheet-based magadiites are promising adsorbents with controlled interlayer space and well-defined 2D structure, which make them new candidates for heavy metal removal and a platform to study the 2-dimensional plane trap effects between the silicate and metals.