3 years ago

Fabrication of phosphate functionalized chiral nematic mesoporous silica films for the efficient and selective adsorption of lanthanum ions

Enxiu Liu, Li Chen, Jiangdong Dai, Yunyun Wang, Chunxiang Li, Yongsheng Yan

Publication date: Available online 8 January 2019

Source: Journal of Molecular Liquids

Author(s): Enxiu Liu, Li Chen, Jiangdong Dai, Yunyun Wang, Chunxiang Li, Yongsheng Yan

Abstract

Excessive consumption and exploitation of rare earth elements (REEs) had led to the serious waste of resources and environmental problems in terms of the abandoned REEs-containing secondary resources, such as optical glasses doped with lanthanum (La). In this article, two types of bio-templated chiral nematic mesoporous silica films (MSFs) were prepared via the direct copolymerization (MSFs-1) and post-grafting (MSFs-2), respectively, for the selective adsorption of La(III). Nanocrystalline celluloses (NCCs) were applied as a structural oriented bio-template and phosphate groups with specific recognition ability for La(III) were modified on the surface of both films. The films retained the well-ordered chiral nematic structure with large surface area and uniform pore size after the removal of NCCs without any disruption of organosilica frameworks. Both MSFs-1 and MSFs-2 showed strong adsorption affinity for La(III) with the maximum adsorption capacity of 77.74 and 69.24 mg g−1 at pH = 7, respectively. The distribution coefficients for La(III) were 832 mL g−1 for MSFs-1 and 805 mL g−1 for MSFs-2, which indicated both films possessed good selectivity for La(III). Owing to this highly ordered chiral nematic mesoporous structure, the adsorption equilibrium could be reached within 3.0 h at 298 K. Furthermore, the MSFs exhibited the excellent regeneration ability, showing potential application possibility for the selective adsorption of La(III).

Graphical abstract

Novel highly ordered mesoporous silica films were prepared using nanocrystalline celluloses (NCCs) as template, via phosphate groups by two modification approaches, either in direct copolymerization (MSFs-1), or grafting (MSFs-2), for fast super highly efficient adsorption and high selectivity of La (III) from water.

Unlabelled Image

You might also like
Discover & Discuss Important Research

Keeping up-to-date with research can feel impossible, with papers being published faster than you'll ever be able to read them. That's where Researcher comes in: we're simplifying discovery and making important discussions happen. With over 19,000 sources, including peer-reviewed journals, preprints, blogs, universities, podcasts and Live events across 10 research areas, you'll never miss what's important to you. It's like social media, but better. Oh, and we should mention - it's free.

  • Download from Google Play
  • Download from App Store
  • Download from AppInChina

Researcher displays publicly available abstracts and doesn’t host any full article content. If the content is open access, we will direct clicks from the abstracts to the publisher website and display the PDF copy on our platform. Clicks to view the full text will be directed to the publisher website, where only users with subscriptions or access through their institution are able to view the full article.