Significant Improvement On Selectivity And Capacity Of Glycine-Modified Feco-Layered Double Hydroxides In The Removal Of As (V) From Polluted Water

A series of novel Fe/Co layered double hydroxides modified with glycine (named as FeCo-LDH@G) were prepared and served as high-performance adsorbents for As (V). With a Fe/Co mole ratio of 1:1, the Fe0.02Co0.02-LDH@G adsorbents achieved significant improvements on the adsorption selectivity and capacity for As (V). The As (V) adsorption by Fe0.02Co0.02-LDH@G follows Langmuir isotherm model and pseudo-second-order kinetics model. The maximum adsorption capacity is 820 mg g(-1) and the equilibrium reaches in 120 min. Under the assistance of electrochemical devices, the Fe0.02Co0.02-LDH@G adsorbent was regenerated and the adsorption capacity for As (V) was dropped only about 13.41% in 5 cycles. These excellent performances make Fe0.02Co0.02-LDH@G as promising As (V) adsorbents for commercial wastewater treatments.