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

Research output: Contribution to journalArticlepeer-review

6 Citations (Scopus)

Abstract

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).

Original languageEnglish
Pages (from-to)1232-1241
Number of pages10
JournalJournal of Material Cycles and Waste Management
Volume21
Issue number5
DOIs
Publication statusPublished - 2019 Sep 13

Keywords

  • Adsorption
  • Cadmium
  • Manganese
  • Mg–Al-layered double hydroxides
  • Mine wastewater

ASJC Scopus subject areas

  • Waste Management and Disposal
  • Mechanics of Materials

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