Removal of Cu2+, Pb2+ and Cd2+ by layered double hydroxide-humate hybrid. Sorbate and sorbent comparative studies

M. ÁNGELES GONZALEZ; IVANA PAVLOVIC; RICARDO ROJAS; CRISTOBALINA BARRIGA

ELSEVIER SCIENCE SA

Lugar: Amsterdam; Año: 2014 vol. 254 p. 605 - 605

he synthesis of a layered double hydroxide-humate (LDH-H) hybrid was purposed for the removal of Cu2+, Pb2+ and Cd2+ from aqueous solutions. This sorbent has been synthesized by incorporating humate anion into magnesium aluminum layered double hydroxide with chloride as interlayer anion (LDH-Cl) via ion exchange. Effects of various physic-chemical factors such as pH influence, contact time, initial metal concentration and the simultaneous sorption of the three heavy metal ions onto LDH-H were investigated. The sorption capacities of humic acid (HA), LDH-Cl and LDH-H were compared under the same experimental condition. The hybrid LDH-H presented better properties, such as greater stability and less pH increase throughout the sorption process. A high affinity and large removal capacity of Cu2+, Pb2+ and Cd2+ were obtained by complexation and hydroxide precipitation mechanism, being this major for the case of Cu2+, according to his low hydroxide solubility product value. The sorpt