Comment on "removal of hexavalent chromium by biochar supported nZVI composite: Batch and fixed-bed column evaluations, mechanisms, and secondary contamination prevention"

Tran HN 1 , Pham VV 2 , Vo DN 3 , Nguyen-Tri P 4

Affiliations 

  • 1 Institute of Fundamental and Applied Sciences, Duy Tan University, Ho Chi Minh City 700000, Vietnam. Electronic address: [email protected]
  • 2 Faculty of Materials Science and Technology, University of Science, VNU-HCM, Ho Chi Minh City, 700000, VietNam
  • 3 Faculty of Chemical & Natural Resources Engineering, Universiti Malaysia Pahang, Lebuhraya Tun Razak, Gambang, 26300, Pahang, Malaysia
  • 4 Department of Chemistry, University of Montreal, Montreal, QC, Canada
Chemosphere, 2019 Oct;233:988-990.
PMID: 30853115 DOI: 10.1016/j.chemosphere.2019.02.084

Abstract

This article aims to discuss (1) the incorrect identification of Cr(III) and Cr(VI) binding energies in the Cr 2p XPS (X-ray photoelectron spectroscopy) spectra of the laden adsorbent (the nZVI-BC sample after Cr(VI) adsorption), (2) misconception regarding the Weber-Morris intraparticle diffusion model, and (3) inconsistency between the experiential data and the Thomas adsorption rate constants. The authors hope that our comments are beneficial for other researchers to avoid the undesirable mistakes.

* Title and MeSH Headings from MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine.

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