A novel 3D superelastic polyethyleneimine functionalized chitosan aerogels for selective removal of Cr(VI) from aqueous solution: performance and mechanisms

Xanthate-Modified Magnetic Fe3O4@SiO2-Based Polyvinyl Alcohol/Chitosan Composite Material for Efficient Removal of Heavy Metal Ions from Water

“…The absorption peaks at 1110 cm −1 were caused by the Si–O–Si vibrations, which also confirmed the formation of silicon shells on the surface of the Fe 3 O 4 [ 45 , 46 , 47 , 48 ]. After the modification, the intensity of the characteristic peaks weakened, and the peak characteristics of C=S and S–C–S appeared at 1214 cm −1 , indicating the successful production of the thiol-based modified chitosan hydrogel [ 49 , 50 ]. The infrared spectrum of the XMPC indicated the presence of chitosan and Fe 3 O 4 @SiO 2 .…”

Mechanically robust sodium alginate/cellulose nanofibers/polyethyleneimine composite aerogel for effective removal of hexavalent chromium and anionic dyes

“…The broad peaks between 3600 and 3000 cm À1 for all samples are assigned to the tensile vibration of OH. [23] The characteristic COO , and C O C . [15] Among them, 1610 and 1463 cm À1 represent COO (symmetric stretching) and COO (asymmetric stretching), respectively.…”

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.…”