INFIQC   05475
INSTITUTO DE INVESTIGACIONES EN FISICO- QUIMICA DE CORDOBA
Unidad Ejecutora - UE
artículos
Título:
Removal of Cu2+, Pb2+ and Cd2+ by layered double hydroxide-humate hybrid. Sorbate and sorbent comparative studies
Autor/es:
M. ÁNGELES GONZALEZ; IVANA PAVLOVIC; RICARDO ROJAS; CRISTOBALINA BARRIGA
Revista:
CHEMICAL ENGINEERING JOURNAL
Editorial:
ELSEVIER SCIENCE SA
Referencias:
Lugar: Amsterdam; Año: 2014 vol. 254 p. 605 - 611
ISSN:
1385-8947
Resumen:
The 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 sorption isotherms were well described by Langmuir equation. The metal removal efficiency was lower when the three cations are competing for the available adsorbent sites, compared to monocomponent solutions.