Removal of methylene blue dye using nano zerovalent iron, nanoclay and iron impregnated nanoclay – a comparative study

Abstract

There has been an increasing challenge from the emission of methylene blue (MB) dye-containing wastewater and its management methods in industry.

Comments on “Removal of methylene blue dye using nano zerovalent iron, nanoclay and iron impregnated nanoclay – a comparative study” by M. M. Tarekegn, R. M. Balakrishnan, A. M. Hiruy and A. H. Dekebo, RSC Adv., 2021, 11, 30109

“…It is of course important to emphasize that this ‘Comment’ paper should not discredit the work by Tarekegn et al 1 On the contrary, the original published article is really interesting and contributes to scientific knowledge; however, as indicated above, some corrections should be conducted and published by the original authors. Furthermore, the present authors hope that these comments will be read in the spirit in which they are intended; that is, constructive criticism to produce a better final scientific paper, and to avoid the dissemination of undesirable and overlooked mistakes into the scientific literature, as discussed for example in several recent critical papers, here cited within the Discussion section.…”

“…Here we will mainly focus on subsection ‘3.4 Adsorption isotherms, kinetics and thermodynamics’ in the original paper, 1 where several fundamental errors can be discovered.…”

“…Recently, the above-cited paper (hereafter also called ‘the original paper’) was published in RSC Advances by Tarekegn et al 1 The objective of the paper is ambitious, and this detailed study of the preparation and characterization of nZVI, nanoclay and iron-impregnated nanoclay, and their use for adsorbing the methylene blue (MB) dye in batch mode, is worthy of interest.…”

Nano Clay-Polymer Composite for Water Treatment

“…The acute and chronic impacts of dyes are skin allergy, metamorphosis, tumor and cancer [73].The adsorption through nano-composites clay is being used by various researchers. Most common dye, methylene blue is been adsorbed through thin film membrane prepared with mixed matrix nanoclay/chitosan on poly-vinylidene difluoride microfiltration base, Kappa-carrageenan biopolymer-based nanocomposite hydroge, PVA/CMC/halloysite nanoclay bio composites, nZVI nanoclay, iron impregnated nanoclay, and nano-clay composite PLA/C20A [74][75][76][77][78]. Orange G dye has been successfully removed from the aqueus solution through nanoclay composites [79].…”

Optimization study of the adsorption of malachite green removal by MgO nano-composite, nano-bentonite and fungal immobilization on active carbon using response surface methodology and kinetic study

“…Globally, about 280,000 tons of synthetic dyes are discharged into natural streams every year from wastewater produced by a variety industries, such as leather, food, textile, paper, cosmetic, printing, and carpet manufacturers [2]. The textile industry consumes 100-200 L of water per kg of textiles produced, Page 2 of 37 Hussien Hamad Environmental Sciences Europe (2023) 35:26 resulting in the generation of large amounts of wastewater during the dyeing process [3]. Malachite green (MG) is a synthetic dye used to dye silk, cotton, leather, wool, and paper, and it is also employed as a fungicide and disinfectant in the fish farming industry, as it affords the control of fish parasites and diseases [4].…”