Adsorption of nitrate from water by core-shell chitosan wrinkled microspheres @LDH composite: Electrostatic interaction, hydrogen bonding and surface complexation

Unveiling glutamic acid-functionalized LDHs: understanding the Cr(vi) removal mechanism from microscopic and macroscopic view points

“…3a, the NiFe-LDH curve shows a typical IV isotherm with an H 3 -type hysteresis loop ( P / P 0 > 0.4), indicating that the number of Glu@NiFe-LDH intermediate pores was greatly increased after the modification, which was more favorable for CrO 4 2− ion adsorption. 44 In contrast, Glu@NiFe-LDH exhibits a type II isotherm, indicating the presence of large pores in the sample. However, hysteresis lines are characteristic of mesoporous materials with pore sizes less than 50 nm.…”

Adsorption of nitrate from water by quaternized chitosan wrinkled microspheres@MgFe-LDH core–shell composite

“…There was a new absorption peak at 2933 cm −1 on the FTIR spectra of GCS, which was due to the increase in C–H caused by the crosslinking of glutaraldehyde. 24…”

“…There was a new absorption peak at 2933 cm À1 on the FTIR spectra of GCS, which was due to the increase in C-H caused by the crosslinking of glutaraldehyde. 24 Additionally, because of the formation of imino groups (-NQCH-) by Schiff base reaction, the peak at 1655 cm À1 was enhanced, and the peak at 1600 cm À1 was weakened. The peak at 1572 cm À1 was formed by the superposition of bending vibration of N-H and tensile vibration of C-N. 25,26 These changes indicated that GCS microspheres were successfully synthesized by crosslinking CS with glutaraldehyde, which also is evident in the SEM.…”

Polymer-based nanocomposite adsorbents for resource recovery from wastewater

“…9A) due to co-existing ions (Cl − , HCO 3 − , and SO 4 2− ) which competed for the active sites of the composite surface. 104 The negative effect of oxyanions (SO 4 2− and CO 3 2− ) on the adsorption of NO 3 − could be due to the stronger electrostatic attraction between the high valence anion and the adsorbent under similar conditions. 73,105…”

“…9A) due to coexisting ions (Cl − , HCO 3 − , and SO 4 2− ) which competed for the active sites of the composite surface. 104 The negative effect of oxyanions (SO 4 2− and CO 3 2−…”