Comments on using of "pseudo-first-order model" in adsorption [Int. J. Biol. Macromol., vol. 81].

In Int. J. Biol. Macromol., volume 81, three articles present the idea f a “pseudo-first-order-model”. These are: “Surface ion-imprinted mino-functionalized cellulosic cotton fibers for selective extracion of Cu(II) ions” [1], “Adsorption of methyl orange (MO) by r(IV)-immobilized cross-linked chitosan/bentonite composite” 2], and “A new porous magnetic chitosan modified by melamine or fast and efficient adsorption of Cu(II) ions” [3]. In the first [1] nd second [2] articles, the authors do not cite any appropriate eferences. In the third article [3] the authors cited Zhou et al. [4] s a secondary reference. However, there is a mistake included in ef. [4]. In these two articles [3,4], the authors presented the term pseudo-first-order model” as the same equation: