Poly(methacrylic acid)-graft-Ni3Si2O5(OH)4 multiwalled nanotubes as a novel nanosorbent for effective removal of copper(II) ions

Magnetic nickel chrysotile nanotubes tethered with pH-sensitive poly(methacrylic acid) brushes for Cu(II) adsorption

“…5 diverse pendant active groups, such as hydroxyl (-OH), carboxylic (-COOH) and amino (-NH 2 ) groups, have been proven high adsorption capacity towards various heavy metal ions by chelation or electrostatic interactions. [28,29] Our recent study found that pH-sensitive functional brushes grafted onto the surfaces of crosslinked chitosan (CCS) microsphere caused a significant increase in the adsorption capacity to Cd(II) and Cu(II) ions, [30][31][32][33] owing to the presence of high density of anionic moieties in the polymer chains. However, as far as we know, only a few studies have documented to functionalize magnetic nanosorbents with functional brushes to improve their adsorption capacity toward heavy metal ions.…”

PAMPS-graft-Ni3Si2O5(OH)4 multiwalled nanotubes as a novel nano-sorbent for the effective removal of Pb(ii) ions

“…[14][15][16][17] Moreover, it has been observed that these adsorbents require further modications to increase the number of active binding sites and make them readily available for adsorption. 18,19 Although some of the abovementioned adsorbents are able to remove Pb(II) from contaminated wastewater, high cost is still the main concern or disadvantage of these adsorbents in practical applications. Most of the inorganic minerals are limited by the drawbacks of costly regeneration, low adsorption capacity, poor selectivity and diversity of product structure and composition; however, some of them are still applied.…”

“…Among them, silicate nanomaterials, especially silicate nanotubes (NTs), are considered as promising candidates as they remain well-dispersed and stable in aqueous solutions due to the negative charge and abundant silanol groups on their surfaces. [27][28][29] Some studies have reported the application of silicate NTs in metal removal such as silicatetitanate nanotubes in hydrogel exhibit efficient removal of Cd(II) 30 and PMAA-modied silicate nanotubes exhibit effective removal of Cu(II), 18 indicating the potential application prospect of silicate NTs. In addition, the molecular chain of polymers contains one or more electron donor atoms, such as N, S, O, and P, that can form coordinate bonds with most of the toxic heavy metals; thus, these polymers can be used to enrich or separate heavy metal ions by adsorption, chelation and ion exchange.…”

“…[31][32][33] Some studies have reported that NTs can be modied by vinyl monomer or polymers including siloxane-poly(L-lactic acid)-vaterite 34 and poly(methacrylic acid). 18 However, no studies have been reported on the modi-cation of silicate NTs by PAMPS. Thus, the assumption that PAMPS-modied silicate NTs will be highly efficient in the removal of Pb(II) from water is hypothetical.…”

Redistribution of Mg and Ni cations in crystal lattice of conical nanotube with chrysotile structure

“…an alternative to carbon and chalcogenide nanotubes [20,21]), sorbents and drug containers [22][23][24], catalyst materials [25][26][27][28], and materials for Li-ion energy sources [29]. The high specific surface (up to several hundred m 2 /g [30][31][32]), abundance of OH-groups, and synthetic flexibility made hydrosilicate nanotubes and nanoscrolls suitable for these purposes.…”