Elsevier

Chemosphere

Volume 233, October 2019, Pages 993-994
Chemosphere

Discussion
Comments on “Enhanced removal of Cr(VӀ) from aqueous solution by supported ZnO nanoparticles on biochar derived from waste water hyacinth”

https://doi.org/10.1016/j.chemosphere.2018.11.062Get rights and content

Highlights

  • A mistake of using pseudo-first-order kinetic model has been pointed out.

  • A corrected pseudo-first-order kinetic equation is presented.

  • Inappropriate citations for the adsorption kinetic models have been pointed out.

  • A suggestion for citing the original papers for the kinetic equations has been made.

Abstract

A mistake of using pseudo-first-order kinetic equation for testing kinetic parameters of adsorption has been pointed out, as well as inappropriate citations for the adsorption kinetic models. Further, this discussion gives a correct pseudo-first-order kinetic equation and makes a suggestion for citing the original papers for the pseudo-second-order and intra-particle diffusion kinetic equations.

Cited by (4)

  • Errors and inconsistencies in scientific reporting of aqueous phase adsorption of contaminants: A bibliometric study

    2022, Cleaner Materials
    Citation Excerpt :

    Mistakes in the use of pseudo-first-order kinetic model and improper citations of the models in the article published by Yu et al. (2018) have been reported by Huang (2019c). The many other comments of (Huang, 2018a; Huang, 2018b; Huang, 2019b; Huang, 2019c; Huang, 2019d; Huang, 2019e; Huang, 2019f; Huang, 2019g) on so many other articles with regard to the errors and inconsistencies in published articles that report adsorption studies, is a distress call on all adsorption experts/reviewers to be more vigilant in order to ensure that articles on adsorption research are thoroughly scrutinized to remove weaknesses before their publication. Li et al. (2019), published the metoprolol adsorption onto montmorillonite, using several experimental conditions.

  • Adsorption of lead (Pb-II) using CaO-NPs synthesized by solgel process from hen eggshell: Response surface methodology for modeling, optimization and kinetic studies

    2022, South African Journal of Chemical Engineering
    Citation Excerpt :

    The samples were shaken at speed of 250 rpm, and withdrawn at 15 minute time intervals to determine the residual of lead ion in the solution. Then data from the experiment was provided into pseudo-first-order model, pseudo-second-order, and intraparticle diffusion (Yuan-dong Huang, 2019). Adsorption Isotherm: During the solution is contacted with a solid adsorbent, molecules of adsorbate are transferred from the fluid to the solid until the concentration of adsorbate in solution as well as in the solid phase have become in equilibrium.

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