Study on the adsorption of Ca2+, Cd2+ and Pb2+ by magnetic Fe3O4 yeast treated with EDTA dianhydride

Textural properties and surface chemistry of lotus stalk-derived activated carbons prepared using different phosphorus oxyacids: Adsorption of trimethoprim

“…The four carbons have similar surface functional group by comparing the peaks in their FTIR spectra. The peak at 1413 cm −1 indicated the C O belonged to the carboxyl groups [30,31]. The peak at 1574 cm −1 corresponded to asymmetric stretching vibration of COO − [32].…”

Characterization of nanoscale zero-valent iron supported on granular activated carbon and its application in removal of acrylonitrile from aqueous solution

“…In the pattern of GAC, there was only one broad peak at 23° [13,26] corresponding to amorphous carbon. After reaction of acrylonitrile with NZVI/GAC, the NZVI/GAC showed some new peaks of γ -Fe 2 O 3 (2θ = 36°), Fe 3 O 4 (2θ = 36°/52.5°/62.5°), suggesting the occurrence of reactions between the micro-electrolysis system and acrylonitrile, where NZVI particles acted as reductants providing electrons for the destruction of acrylonitrile [27,28].…”

Removal of heavy metal ions from aqueous solution using Fe3O4–SiO2-poly(1,2-diaminobenzene) core–shell sub-micron particles

“…At lower pH, amine or imine groups mainly existed in the form of ANH þ 2 A or ANH þ 3 [6,15], blocking the approach of metal ions for electrostatic repulsion and then resulted in the lower removal efficiency. In addition, the positively charged hydronium ions (H 3 O + ) competed with the metal cations for binding on the surface binding sites on the FSPs at lower pH values [33]. With increasing pH, the deprotonation of amine and imine groups was in favor of the chelating effect [6,15].…”