Removal of Mn and Cd contained in mine wastewater by Mg–Al-layered double hydroxides

Mir Tamzid Rahman, Tomohito Kameda, Takao Miura, Shogo Kumagai, Toshiaki Yoshioka

研究成果: Article査読

6 被引用数 (Scopus)

抄録

The fate of heavy metals in the environment is significantly influenced by their adsorption onto clay minerals. Herein, we investigate the mechanism of MnO4 and Cd2+ removal by nitrate-intercalated Mg–Al-layered double hydroxides (LDHs) in aqueous solution and optimize the corresponding conditions, showing that these adsorbents can effectively remove Zn, Mn, and Cd from mine wastewater and revealing that adsorbent structure is retained after wastewater treatment. The removal of MnO4 ions from aqueous solution is demonstrated to proceed via their exchange for NO3 ions intercalated within LDHs and is well described by the Freundlich adsorption model, following pseudo-second-order kinetics and featuring chemisorption as the rate-determining step. In contrast, Cd2+ is shown to be removed via the formation of Cd5(OH)8(NO3)2·2H2O (at LDH2) and Cd(NO3)2·Cd(OH)2 (at LDH1).

本文言語English
ページ(範囲)1232-1241
ページ数10
ジャーナルJournal of Material Cycles and Waste Management
21
5
DOI
出版ステータスPublished - 2019 9 13

ASJC Scopus subject areas

  • 廃棄物管理と処理
  • 材料力学

フィンガープリント

「Removal of Mn and Cd contained in mine wastewater by Mg–Al-layered double hydroxides」の研究トピックを掘り下げます。これらがまとまってユニークなフィンガープリントを構成します。

引用スタイル