Cobalt/zinc based metal organic frameworks as an effective adsorbent for improved removal of As(V) and Cr(VI) in a wide pH range

Azile Nqombolo, Tshimangadzo S. Munonde, Thollwana A. Makhetha, Richard M. Moutloali, Philiswa N. Nomngongo

Research output: Contribution to journalArticlepeer-review

21 Citations (Scopus)

Abstract

Herein, a Co/Zn based metal organic frameworks (ZIF-67/ZIF-8) adsorbent was synthesized through a facile method and used for the removal of As(V) and Cr(VI) ions. The adsorbent was characterized by Brunauer Emmett and Teller (BET), X-ray photoelectron spectroscopy (XPS), high resolution scanning electron microscopy (HR-SEM) equipped with energy dispersive spectroscopy (EDS), transmission electron scanning microscopy (TEM) and X-ray diffraction (XRD). The XPS results confirmed that a mixed metal MOF ZIF-67/ZIF-8 was formed. Several isotherm models were studied and the obtained results indicated a homogeneous monolayer adsorption described by Langmuir isotherm with maximum capacities of 69.4 and 71.4 mg g-1 for Cr(VI) and As(V) respectively. The adsorbent selectively removed both oxyanions in real water samples, i.e., a complex matrix that contained other metals and anions. The ZIF-67/ZIF-8 showed excellent adsorption properties towards the two targeted heavy metals therefore can be a great adsorbent in wastewater treatment.

Original languageEnglish
Pages (from-to)1845-1855
Number of pages11
JournalJournal of Materials Research and Technology
Volume12
DOIs
Publication statusPublished - 2021

Keywords

  • Adsorptive removal
  • Contaminated water
  • Intraparticle diffusion
  • Langmuir
  • MOF
  • Maximum adsorption
  • Monolayer adsorption
  • Toxic metals
  • ZIF-67/ZIF-8

ASJC Scopus subject areas

  • Ceramics and Composites
  • Biomaterials
  • Surfaces, Coatings and Films
  • Metals and Alloys

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