Synthesis of mesoporous magnetic MnFe2O4@CS-SiO2 microsphere and its adsorption performance of Zn2+ and MB studies

Preparation of a double-network hydrogel based on wastepaper and its application in the treatment of wastewater containing copper(ii) and methylene blue

“…19 While the binding energy of the WP/PAM-MB decreased slightly from 399.49 eV to 399.24 eV, indicating that the WP/PAM had electrostatic interaction with N element in MB, increasing the density of the nearby electron cloud. 42,50 The 43 As for the WP/PAM-MB, the C-O-H peak originally located at 532.71 eV had moved to a higher binding energy (532.81 eV), demonstrating that C-O-H was involved in the MB adsorption, which was in accordance with the results reported previously. 57 Combined with the analysis of N 1s, it was reasonable to conclude that it was the C-O-H in the WP/PAM had electrostatic interaction with N in MB.…”

“…Obviously, the higher R 2 value ( R 2 > 0.99) in the pseudo-second-order model evinced that the adsorption behavior of the WP/PAM on Cu( ii ) and MB was related to chemical adsorption. 42 The K 2 < 1 indicated that the reaction between the WP/PAM and Cu( ii ) and MB were rapid. 43 Besides, the Q e values obtained by the pseudo-second-order model were 132.2 mg g −1 for Cu( ii ) and 1653.6 mg g −1 for MB, respectively, which were near to the experimental values (139.5 mg g −1 for Cu( ii ) and 1705.5 mg g −1 for MB).…”

“… 19 While the binding energy of the WP/PAM–MB decreased slightly from 399.49 eV to 399.24 eV, indicating that the WP/PAM had electrostatic interaction with N element in MB, increasing the density of the nearby electron cloud. 42,50 …”

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

“…[10,12,17,61] The reusability of the Gd/SrFe@SBCs in Pb(II) and Cd(II) ions removal has been studied and represented in Figure 10, and revealed that after 5 cycles the removal percentage of Pb(II) and Cd(II) ions decreases from 98 and 78% to 93 and 71%, respectively, similar to previous studies, due to the solubility of chitosan in acid media and losses of chitosan mass. [11,[61][62][63] Two different kinetic models, pseudo-first and secondorder, were used for the rate determination of Pb(II) and Cd(II) ions adsorption onto Gd/SrFe@SBCs. The linear form of first-and second-order models are given below: ln q e À q t ð Þ¼lnq ek 1 t: where q e and q t are adsorption capacities at equilibrium and at t time, respectively.…”

“…[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.…”