Adsorption of methyl orange (MO) by Zr (IV)-immobilized cross-linked chitosan/bentonite composite

Enhancement of the adsorption properties of two natural bentonites by ion exchange: equilibrium, kinetics and thermodynamic study

“…Therefore, it can be inferred that the pseudo-second-order model showed good compliance with the experimental data. These results are in good agreement with others studies that showed that the adsorption of MO dye on modified montmorillonite is best described by the pseudo-second-order model (Luo et al, 2015;Zhang et al, 2015, Zang et al, 2017.…”

“…Although most of these methods are efficient, they are often expensive and produce secondary waste products. Among all of these techniques, adsorption seems to be very promising, as it is inexpensive, simple to perform, requires little energy input and produces relatively little sludge (Nadaroglu et al , 2015; Zhang et al , 2015; He et al , 2018). Adsorption of MO dye on activated carbon materials has been widely studied due to the effectiveness and versatility of these materials (Chen et al , 2010; Huo et al , 2013; Leon et al , 2015).…”

Hexavalent chromium ion and methyl orange dye uptake via a silk protein sericin–chitosan conjugate

“…16,17,19 Moreover, its incorporation in biocomposites, such as chitosan-polyaniline, which showed a better adsorption capacity for Cr(VI) ions than that exhibited by chitosan alone, holds even greater promise. 20,21 Likewise, a number of other chitosan-based compositese.g., graphene oxide-chitosan, 22 zirconium crosslinked chitosan, 23 chitosan/silica gel, 24 chitosan/bentonite, 25,26 magnetic chitosan, 27 and magnetic graphene oxide-chitosan, 28 among otherswere also shown to be effective in the adsorption of dyes and heavy metals from water. Such chitosan composites are advantageous and necessary if an insoluble adsorbent is required, since the solubility of un-crosslinked chitosan in acidic media is high.…”

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“…Methyl range is an anionic dye soluble in water, widely used in the chemical, textile and paper industries. It is an anionic dye that poses a serious risk to the environment [21][22][23].…”