Adsorption of Pb2+, Cu2+ and Cd2+ by sulfhydryl modified chitosan beads

Retracted: Adsorption of Pb(II) and Cd(II) by magnetic chitosan‐salicylaldehyde Schiff base: Synthesis, characterization, thermal study and antibacterial activity

“…[ 31,32,40 ] In this work, removal of Pb(II) and Cd(II) ions may be take place through both physical and chemical adsorption. [ 33,34 ] However, complexation is favorite mechanism for removal of metal ions. [ 41 ] The chemical adsorption mechanism is proposed in Scheme 1.…”

“…The maximum adsorption capacity of Cu(II) and Pb(II) on the NPCS‐PEI are 276.12 and 645.16, respectively. Yang et al [ 34 ] prepared chitosan‐based bead by crosslinking as well as sulfhydryl modification reaction and studied its removal activity of Pb(II), Cu(II) and Cd(II). One of the most important advantages of magnetic chitosan Schiff bases, is their easily separated from solution using an external magnet and finally resulting the colorless and clear supernatant.…”

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

“…[1][2][3][4] These pollutions are very stable, cannot be degraded, and highly toxic, which may pose a serious threat to human health and the environment. Various heavy meal ions such as Cr(VI), [5,6] Cu(II), [5,[7][8][9][10] Co(II), [5] Cd(II), [7,[10][11][12][13] Hg(II), [14,15] Ni(II), [9] Zn(II), [9] Pb(II), [7,8,[10][11][12][13][16][17][18][19][20] and Li [21] are among the most dangerous pollutions due to their high toxicity, the nature of carcinogenicity, and bioaccumulation. Therefore, it is necessary to develop an effective technique to remove heavy metal ions from water.…”

“…Therefore, it is necessary to develop an effective technique to remove heavy metal ions from water. [5][6][7][8][9][10][11][12][13][14][15][16][17][18][19][20][21] Until now, various routes such as membrane filtration, [22,23] electrocoagulation, [24] ion-exchange, [25,26] and adsorption [5][6][7][8][9][10][11][12][13][14][15][16][17][18][19][20][21] have been developed to removal of heavy metal ions from wastewater. Adsorption process is very simple, cost-effective, highly efficient, flexible, and does not produce secondary pollution has attracted more attention.…”

“…Adsorption process is very simple, cost-effective, highly efficient, flexible, and does not produce secondary pollution has attracted more attention. [27][28][29][30][31] In this technique, various traditional adsorbents such as montmorillonite, [32,33] silica, [34,35] active carbon, [36][37][38] magnetic nanoparticles, [39,40] and modified chitosan [5][6][7][8][9][10][11][12][13][14][15][16][17][18][19][20][21][27][28][29][30][31] have been probed and applied for removing heavy metal ions from wastewater. Modified chitosan due to the existence of active sorbent groups such as -NH 2 , -OH, -SO 3 H, and -COOH are often used to treat wastewater containing heavy metal ions.…”