Adsorption isotherms and kinetics of arsenic removal from aqueous solution by Mg–Al layered double hydroxide intercalated with nitrate ions

研究成果: Article査読

26 被引用数 (Scopus)

抄録

Arsenic contamination in groundwater is an environmental problem that affects large populations on the global scale. The anion exchange material, Mg–Al layered double hydroxide (Mg–Al LDH) intercalated with NO3, is an effective adsorbent for removing As(V) from aqueous solutions. In this study, we prepared Mg–Al LDH with a high anion exchange capacity by the co-precipitation method, and investigated its adsorption isotherm and reaction kinetics with As(V). The adsorption process is well described by the Langmuir model. The maximum adsorption capacities were determined to be 142.86 and 76.92 mg/g for LDHs synthesized with initial Mg/Al molar ratios of 2 and 4, respectively. The reaction kinetics of As(V) with Mg–Al LDH is demonstrated to be pseudo-second order, which indicates that chemisorption (i.e., anion exchange of HAsO42− with the intercalated NO3) is the rate determining step. The values of the activation energy also indicate that anion exchange is the predominant adsorption mechanism.

本文言語English
ページ(範囲)703-714
ページ数12
ジャーナルReaction Kinetics, Mechanisms and Catalysis
120
2
DOI
出版ステータスPublished - 2017 4

ASJC Scopus subject areas

  • 触媒
  • 物理化学および理論化学

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