Water Research Centre, Asia University, Taichung 41354, Taiwan
Received Date: February 11, 2017 Accepted Date: March 21, 2017 Published Date: March 30, 2017
Citation: Ho YS (2017) Utilization of Cross-linked Chitosan/Bentonite Composite in the Removal of Methyl Orange from Aqueous Solution. Chem Sci J 7: e116. doi: 10.4172/2150-3494.1000e116
Copyright: © 2017 Ho YS. This is an open-access article distributed under the terms of the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original author and source are credited.
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Recently, Ho has published a research paper entitled “Utilization of cross-linked chitosan/bentonite composite in the removal of methyl orange from aqueous solution” . In section of adsorption kinetics, authors noticed “The pseudo-first-order kinetic model, also known as the Lagergren kinetic equation as expressed in Equation (1), is widely employed to understand the kinetic behavior of the adsorption reactions ”.
This is a quotation error. Equations (1) could not be found in the reference . In fact, Equation (1) is not correct. Units of parameters in Equation (1) also cannot agree each other. Thus results and conclusion in “Utilization of cross-linked chitosan/ bentonite composite in the removal of methyl orange from aqueous solution” might not be apt. The first order rate equation was initially represented by Langergren which describes the adsorption of malonic acid and oxalic acid into charcoal in 1898 . Lagergren’s first order equation was called as pseudo-first order to represent a difference in kinetic equation using the solution concentration and adsorbance capacity of a solid by chemisorption kinetic models [4,5] since 1998. The absorption reactions using the Lagergren rate equations was published by Ho in 2004 . The most commonly used formula is
qe and qe (mg/g) represents the capacities of adsorption at equilibrium and t represents the time. k (1/min) represents the pseudo-first order adsorption rate constant. In recent years, the same mistake can be found in Food Chemistry , Journal of Molecular Liquids  and Journal of Environmental Sciences .
A commentary has been done [8,11] to prevent the propagation of pseudo-first order model mistake and the intra particle diffusion model. The original paper citation might not only show the author’s work who presented a novel research but also gives the information about their idea of research in detail in their paper . In my view, to represent the pseudo-first order and intra-particle diffusion kinetic models, Huang et al.  might have cited the original paper which would enhance the accuracy and information about the kinetic expression they have used.
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