Strong selectivity and high capacity in the adsorption of As (V) from wastewater by glycine-modified Fe/Cu-layered double hydroxides

A series of glycine modified Fe/Cu LDH (GFC) adsorbents were prepared. With a Fe/Cu mole ratio of 1:1, the adsorption of GFC1 for As (V) was characterized by its strong selectivity and high adsorption capacity. The adsorption of GFC1 for As (V) followed the Langmuir isotherms model and pseudo-second-order kinetics model, achieving a saturated adsorption capacity of 808.71 mg g(-1) and reaching equilibrium after 60 min. The regeneration of GFC1 was achieved under the assistance of an electrochemical device. Compared with cycle 1, the adsorption capacity in cycle 5 was decreased by about 13.53%. Based on these advantages, GFC1 can be regarded as a possible candidate for arsenic adsorption from wastewater with a high commercial value. (C) 2021 Elsevier B.V. All rights reserved.

Automated summary

A series of glycine modified Fe/Cu LDH (GFC) adsorbents were prepared with high selectivity and adsorption capacity for As (V), following Langmuir isotherms and pseudo-second-order kinetics models. GFC1 showed potential as a candidate for arsenic adsorption from wastewater with high commercial value, despite a slight decrease in adsorption capacity after multiple cycles.