Equilibrium and kinetic analysis of sorption of copper onto diatomaceous earth (CROSBI ID 199853)
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Podaci o odgovornosti
Marinić Pajc, Ljiljana ; Rogošić, Marko ; Horvat, Alka J.M. ; Štrkalj, Anita
engleski
Equilibrium and kinetic analysis of sorption of copper onto diatomaceous earth
U postupku razvoja novih materijala za sorpciju žive iz ugljikovodičnih smjesa na osnovi bakrom modificirane dijatomejske zemlje, istražena je sorpcija bakra iz vodenih otopina Cu2+ iona na prirodnoj (Dz), odnosno predobrađenoj dijatomejskoj zemlji. Predobrada Dz provedena je na dva načina: ispiranjem vodom (Dz-I) ili hidratacijom (Dz-H-48). Ravnotežna i kinetička sorpcijska analiza provedena je jednostavnim šaržnim postupkom pri 25, 40 i 60 °C ; koncentracija Cu2+ u otopini mjerena je atomskom apsorpcijskom spektrometrijom. Pokazalo se da Dz-I veže znatno veću masu bakra (79, 10 mg g-1) u odnosu na Dz (44, 8 mg g-1), pri čemu povišenje temperature smanjuje masu vezanog bakra. Ravnotežna sorpcija bakra na Dz, Dz-I i Dz-H-48 uspješno se opisuje Freundlichovim modelom. Kinetiku sorpcije moguće je opisati Lagergrenovim pseudokinetičkim modelom I. reda.
diatomaceous earth ; sorption ; copper ; Freundlich sorption isotherm ; Lagergren pseudokinetic model
Abstract In developing new materials for the sorption of mercury from hydrocarbon mixtures, based on copper-modified diatomaceous earth, sorption of copper from aqueous solutions of Cu2+ ions on natural (Dz) as well as on conditioned diatomaceous earth was investigated. Dz was conditioned in two ways, by rinsing (Dz- I) and by hydration (Dz-H-48). Equilibrium and kinetic sorption analysis was performed by a simple batch procedure at 25, 40 and 60 °C ; concentration of Cu in solution was measured by atomic absorption spectroscopy. It was found that Dz-I was capable of binding significantly more copper (79.10 mg g-1) than Dz (44.8 mg g-1) ; increasing temperature diminished the mass of bound copper. Equilibrium sorption of water on Dz, Dz-I and Dz-H-48 was successfully described by the Freundlich model. Sorption kinetics was well approximated by the Lagergren 1st order pseudokinetic model.
hrvatski
Ravnotežna i kinetička analiza sorpcijskog vezanja bakra na dijatomejsku zemlju
U postupku razvoja novih materijala za sorpciju žive iz ugljikovodičnih smjesa na osnovi bakrom modificirane dijatomejske zemlje, istražena je sorpcija bakra iz vodenih otopina Cu2+ iona na prirodnoj (Dz), odnosno predobrađenoj dijatomejskoj zemlji. Predobrada Dz provedena je na dva načina: ispiranjem vodom (Dz-I) ili hidratacijom (Dz-H-48). Ravnotežna i kinetička sorpcijska analiza provedena je jednostavnim šaržnim postupkom pri 25, 40 i 60 °C ; koncentracija Cu2+ u otopini mjerena je atomskom apsorpcijskom spektrometrijom. Pokazalo se da Dz-I veže znatno veću masu bakra (79, 10 mg g-1) u odnosu na Dz (44, 8 mg g-1), pri čemu povišenje temperature smanjuje masu vezanog bakra. Ravnotežna sorpcija bakra na Dz, Dz-I i Dz-H-48 uspješno se opisuje Freundlichovim modelom. Kinetiku sorpcije moguće je opisati Lagergrenovim pseudokinetičkim modelom I. reda.
dijatomejska zemlja ; sorpcija ; bakar ; Freundlichova sorpcijska izoterma ; Lagergrenov pseudokinetički model
Abstract In developing new materials for the sorption of mercury from hydrocarbon mixtures, based on copper-modified diatomaceous earth, sorption of copper from aqueous solutions of Cu2+ ions on natural (Dz) as well as on conditioned diatomaceous earth was investigated. Dz was conditioned in two ways, by rinsing (Dz- I) and by hydration (Dz-H-48). Equilibrium and kinetic sorption analysis was performed by a simple batch procedure at 25, 40 and 60 °C ; concentration of Cu in solution was measured by atomic absorption spectroscopy. It was found that Dz-I was capable of binding significantly more copper (79.10 mg g-1) than Dz (44.8 mg g-1) ; increasing temperature diminished the mass of bound copper. Equilibrium sorption of water on Dz, Dz-I and Dz-H-48 was successfully described by the Freundlich model. Sorption kinetics was well approximated by the Lagergren 1st order pseudokinetic model.
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