Adsorption of arsenic on layered double hydroxides: Effect of the particle size

Li Yang, Megha Dadwhal, Zoya Shahrivari, Mayur Ostwal, Paul K.T. Liu, Muhammad Sahimi, Theodore T. Tsotsis*

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

67 Scopus citations

Abstract

This paper describes a study of arsenic(V) adsorption on appropriately conditioned calcined layered double hydroxide (LDH) adsorbents. Conditioning the adsorbent significantly reduced the dissolution previously observed with uncalcined and calcined LDH. The adsorption rates and isotherms have been investigated in batch experiments. As(V) adsorption is shown to follow a Sips-type adsorption isotherm. The As(V) adsorption rate on conditioned LDH increases with decreasing adsorbent particle size; the adsorption capacity of As(V) on conditioned LDH, on the other hand, is independent of the particle size. When a homogeneous surface diffusion model was used to fit the experimental kinetic data, the estimated diffusivity values were shown to depend on the particle size. On the other hand, when a bidisperse pore model, which considers the adsorbent particles to be agglomerates of microparticles with a porous region present between them, is applied to the same data, it predicts an intracrystalline diffusivity, which is fairly invariable with the particle size.

Original languageEnglish (US)
Pages (from-to)4742-4751
Number of pages10
JournalIndustrial and Engineering Chemistry Research
Volume45
Issue number13
DOIs
StatePublished - Jun 21 2006

ASJC Scopus subject areas

  • Chemistry(all)
  • Chemical Engineering(all)
  • Industrial and Manufacturing Engineering

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