Removal of sulfate from wastewater via synthetic Mg–Al layered double hydroxide: An adsorption, kinetics, and thermodynamic study

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

研究成果: Article査読

抄録

Sulfate-contaminated water is a major environmental problem that alters the taste of water, disturbs the digestive systems of animals and humans, and erodes both soil and metals. In this study, the layered double hydroxide LDH 4Mg2Al·NO3 and LDH 8Mg2Al·NO3 were prepared using a co-precipitation technique, and applied in the adsorption of SO42- from an aqueous solution. The reaction is well described by the Langmuir adsorption model. LDH 4Mg2Al·NO3 and LDH 8Mg2Al·NO3 afforded maximum SO42- adsorption values of 135.14 and 92.59 ​mg/g, respectively. The reaction is best explained by a pseudo-second-order mechanism, which suggests that chemisorption is the rate-determining step. The activation energies of LDH 4Mg2Al·NO3 and LDH 8Mg2Al·NO3 indicate that the adsorption of SO42- on synthetic LDHs predominantly follows an anion-exchange mechanism, wherein SO42- ions in the aqueous medium replaces intercalated NO3- ions in the synthetic LDHs. The thermodynamic parameters (ΔH̊, ΔS̊, and ΔG̊) were also calculated. The reaction was endothermic, and the synthetic LDHs afforded feasible and spontaneous adsorption of SO42-.

本文言語English
論文番号100185
ジャーナルJournal of the Indian Chemical Society
98
11
DOI
出版ステータスPublished - 2021 11

ASJC Scopus subject areas

  • 創薬
  • 物理化学および理論化学
  • 有機化学
  • 無機化学
  • 電気化学

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