Abstract
This pseudo second-order model is not correct. The pseudosecond order kinetic expression for the adsorption systems of divalent metal ions using sphagnum moss peat has been presented by Ho in 1995. The pseudo-second order kinetic model has a nonlinear form qt = (qe kt)/(1 + qekt) and four linear forms such as (t/qt) = (1/kqe ) + (1/qe)t, (1/qt) = (1/ kqe )(1/t) + (1/qe), qt = qe − (1/kqe)(qt/t), and (qt/t) = kqe − kqeqt. 3 The model was also used in numbers of adsorption systems in subsequent years. A review of second-order models for adsorption systems gave more details. In order to stop the proliferation of the mistake, comments have been made in Water Research, Carbohydrate Polymers, Journal of Radioanalytical and Nuclear Chemistry, and Industrial Crops and Products. Citing the original paper not only respects the work of the authors who presented a novel research idea but also discussed this idea in detail in the body of their paper. In my view, Memon et al. should have cited the original paper for the kinetic model and thereby provided greater accuracy and information details about the kinetic expression they employed.
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