Adsorption of SeO42− by delaminated Mg-Al layered double hydroxide nanosheets

研究成果: Article査読

1 被引用数 (Scopus)

抄録

Layered double hydroxides (LDHs) are excellent anion-exchange materials, and are useful in adsorbing hazardous anions. The LDHs form nanosheets upon delamination, which improves their efficiency. In this study, we investigated the SeO42− adsorption properties of the nanosheets obtained by the delamination of NO3⋅Mg-Al LDH in an aqueous solution and compared them with those of the NO3⋅Mg-Al LDH. The SeO42− adsorption by both substances was a “pseudo-second-order rate reaction”. The reaction-rate constant during the early stage was greater for the nanosheets as their surface area was larger than the NO3⋅Mg-Al LDH. The amorphous nanosheets reverted to an ordered LDH structure after the anion exchange. Atomic force microscopy (AFM) imaging and the corresponding height profile analysis of the samples confirmed the nanosheets stacking post SeO42− adsorption. We propose a mechanism of the SeO42− adsorption by the NO3⋅Mg-Al LDH nanosheets. These findings may improve the understanding of the anion exchange by the LDHs, which may lead to the development of high-efficiency materials that extract metals such as Se from wastewater.

本文言語English
論文番号108266
ジャーナルInorganic Chemistry Communications
122
DOI
出版ステータスPublished - 2020 12

ASJC Scopus subject areas

  • 物理化学および理論化学
  • 無機化学
  • 材料化学

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