A new guar gum-based adsorbent for the removal of Hg(II) from its aqueous solutions

Gum ghatti and poly(acrylamide-co-acrylic acid) based biodegradable hydrogel-evaluation of the flocculation and adsorption properties

“…The gum polysaccharides are full of the anionic functionalities which act as the adsorption sites for the adsorption of cationic dyes [29e32]. In a study, the graft co-polymer of guar gum was used for the removal of Hg(II) from the aqueous solution [33]. In another study, peach gum based adsorbent was used for the removal of methylene blue and methyl violet from aqueous solution [34].…”

Synthesis and adsorption characteristics of an heterogenized manganese nanoadsorbent towards methyl orange

“…The positive values of ΔH o revealed that the adsorption process was endothermic in nature; hence with increasing temperature the adsorbed amount at equilibrium increased. The positive value of ΔS° revealed the increased randomness and an increase in the degrees of freedom at the MnNP-solution interface during the immobilization of the MO dye ions on the active sites of the adsorbent (methyl orange is a bulk molecule in comparison with H 2 O; so some water molecules could be desorbed by adsorption of a methyl orange molecule), which indicate the partial liberation of the solvation MO ions from solvent molecules before adsorption (liberation of water molecules from solvated-MO), therefore, enabling commonness of randomness and spontaneity in the system [3][4][5][6][7][8][9][10]. The necessity of a large amount of heat to remove the MO dye ions from the solution makes the sorption process endothermic.…”

“…The experimental adsorption equilibrium data of MO dye on MnNP were fitted by applying the Langmuir, Freundlich and Langmuir-Freundlich isotherm models, which are usual models for aqueousphase adsorption (Table S1) [3][4][5][6][7][8][9][10]. These adsorption models give a representation of the adsorption equilibrium between an adsorbate in solution and the surface active sites of the adsorbent.…”

“…Adsorption is considered quite attractive in terms of its efficiency of removal from dilute solutions [3][4][5][6][7][8][9][10].…”

TiO2 immobilised on biopolymer nanofibers for the removal of bisphenol A and diclofenac from water

“…Polymers like chitosan [19], cyclodextrin [20], cellulosic biopolymer [21], alginic acid [22], and guar gum [23] have been extensively studied for this purpose. Biopolymers have also been studied for stabilization of nanoparticles [24] e.g.…”