title: Nanoparticles of KFeP2O7 implanted on silica gel beads for Cd2+ ion adsorption.
abstract: Nanoparticles of iron and potassium diphosphate (KFeP2O7) implanted in silica gel beads (SiO2) have been investigated as an alternative adsorbent for removing Cd2+ ions from aqueous solutions. Batch adsorption experiments were conducted as a function of contact time, adsorbent dosage, initial cadmium ion concentration, solution pH, and temperature. Kinetic and thermodynamic studies on the cadmium adsorption onto KFeP2O7/SiO2 include a complete analysis and discussion. The equilibrium data were well described by the Freundlich isotherm model. The adsorption kinetic of cadmium on KFeP2O7/SiO2 followed a pseudo-first-order kinetic model obtained by using nonlinear regression analysis. Thermodynamic parameters (enthalpy change, free energy change, and entropy change) indicated that the Cd2+ adsorption process was spontaneous and exothermic in nature. The results showed that the studied KFeP2O7 nanomaterial implanted in silica is an effective adsorbent for cadmium ion removal from wastewater.
authors.affiliation: a Departamento de Química , Instituto Nacional de Investigaciones Nucleares , A.P. 18-1027, Col. Escandón, Delegación Miguel Hidalgo, C.P. 11801, D. F., México.
authors.forename: Eduardo
authors.initials: E
authors.lastname: Ordoñez-Regil
authors.forename: Francisco
authors.initials: F
authors.lastname: Granados-Correa
authors.forename: Enrique
authors.initials: E
authors.lastname: Ordoñez-Regil
authors.forename: María Guadalupe
authors.initials: MG
authors.lastname: Almazán-Torres
mesh_terms: D000327:Adsorption; D002104:Cadmium / Q000737:chemistry / Q000302:isolation & purification*; D003198:Computer Simulation; D007477:Ions; D058085:Iron Compounds / Q000737:chemistry*; D053768:Metal Nanoparticles / Q000737:chemistry* / Q000648:ultrastructure; D008863:Microspheres; D008956:Models, Chemical; D010316:Particle Size; D010710:Phosphates / Q000737:chemistry*; D017680:Potassium Compounds / Q000737:chemistry*; D058428:Silica Gel / Q000737:chemistry*; D014874:Water Pollutants, Chemical / Q000737:chemistry / Q000302:isolation & purification*; D018508:Water Purification / Q000379:methods
chemical_list: D007477:Ions; D058085:Iron Compounds; D010710:Phosphates; D017680:Potassium Compounds; D014874:Water Pollutants, Chemical; D002104:Cadmium; D058428:Silica Gel; C013216:potassium phosphate
keywords: Cd2+ adsorption; KFeP2O7/SiO2 adsorbent; isotherms; kinetics; thermodynamics