Manganese dioxide nanoparticles decorated with chitosan for effective removal of lead and lanthanum ions from water by microwave sorption technique

Promoted adsorptive removal of chromium(vi) ions from water by a green-synthesized hybrid magnetic nanocomposite (NFe3O4Starch-Glu-NFe3O4ED)

“…This behavior is basically due to the possible increase in the number of active functional groups that are freely available to interact with the target metal ions on the surface of the NFe 3 O 4 Starch-Glu-NFe 3 O 4 ED nanocomposite in the same volume and therefore increase the efficiency of adsorption. 42,43 …”

Novel Gd2O3/SrFe12O19@Schiff base chitosan (Gd/SrFe@SBCs) nanocomposite as a novel magnetic sorbent for the removal of Pb(II) and Cd(II) ions from aqueous solution

“…Results demonstrate that the anions do not have much effect on the removal percentage of Pb(II) and Cd(II) ion, while in the presence of Ca(II) and Mg(II), the removal percentage of Pb(II) and Cd(II) ion shows higher decrease than Na(I) and K(I), because they have a higher positive charge and can easily interact to the negative charge of Gd/SrFe@SBCs. [57,62] 4 | CONCLUSIONS The results of regeneration tests and coexisting ions implied that Gd/SrFe@SBCs have sound reusability with more excellent selectivity for Pb(II) than Cd(II). In addition, due to the coordinate atoms and phenyl rings on the surface of Gd/SrFe@SBCs, the potential adsorption mechanism was proposed using coordinated and interaction of these groups to Pb(II) and Cd(II) ions to form polymeric complexes.…”

“…By changing sorbent and conditions, metal ions removal has been changed and confirmed that the adsorption process depended on the type, surface structure, and functional groups on the sorbent. [18,[65][66][67][68][69] In order to investigate the influence of different concentrations of Na(I), K(I), Ca(II), Mg(II) cations and Cl À and NO 3 À on the removal percentage of Pb(II) and Cd(II) ions using Gd/SrFe@SBCs many experiments were performed, [8,14,21,57,62] and the results are shown in Figure 13. Results demonstrate that the anions do not have much effect on the removal percentage of Pb(II) and Cd(II) ion, while in the presence of Ca(II) and Mg(II), the removal percentage of Pb(II) and Cd(II) ion shows higher decrease than Na(I) and K(I), because they have a higher positive charge and can easily interact to the negative charge of Gd/SrFe@SBCs.…”

“…[52][53][54] Until now, many magnetic chitosan nanocomposites have been developed for the removal of heavy metal ions such as Zn(II), Hg(II), Cr(III), Cr(VI), Cu(II), Cd(II), Co(II), and Pb(II). [11,16,18,20,[55][56][57][58][59][60] But, until this moment, a report on the synthesis of Schiff base chitosan nanocomposites using strontium hexaferrite and gadolinium oxide has not been carried out. Therefore, in this work, novel Gd/SrFe@SBCs were synthesized (Scheme 1) and characterized by various techniques.…”

New chitosan modified with epichlohydrin and bidentate Schiff base applied to removal of Pb2+ and Cd2+ ions

“…[18][19][20][21] According to World Health Organization, the concentration limit for Pb(II) and Cd(II) in drinking water are 0.01 and 0.005 ppm, respectively. [9] Therefore, removing these heavy metal ions from the environment and wastewater [18][19][20][21][22][23][24][25][26][27][28] is one of the most important goals of today's society. Until now, many attempts such as ion exchange, [29][30][31] membrane process, [32][33][34] flocculation, [22] and adsorption [20,21,23] have been made to remove heavy metal ions from aqueous solution.…”