Copper, zinc, cadmium and lead biosorption by Gymnogongrus torulosus. Thermodynamics and kinetics studies
Gymnogongrus torulosus adsorption efficiency for cadmium(II), copper(II), lead(II) and zinc(II) were studied in batch mode in different acidic conditions. The adsorbent removal efficiency was determined as a function of contact time, initial metal ions concentration, pH and temperature. G. torulosus...
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todo:paper_09277765_v81_n2_p620_Areco2023-10-03T15:47:16Z Copper, zinc, cadmium and lead biosorption by Gymnogongrus torulosus. Thermodynamics and kinetics studies Areco, M.M. Dos Santos Afonso, M. Biosorption Gymnogongrus torulosus Kinetics Metal removal Acidic conditions Adsorption efficiency Adsorption process Affinity constants Batch modes Biosorption capacity Biosorption process Contact time Copper (ii) Dubinin-Radushkevich Freundlich Gymnogongrus torulosus Intra-particle diffusion Kinetic experiment Langmuir models Langmuirs Lead biosorption Metal removal Metal uptake Pseudo second order kinetics Pseudo-second-order kinetic models Rate-limiting steps Removal efficiencies SEM Solution parameters Surface area Temkin model Thermodynamics and kinetics Water adsorption Adsorption Cadmium Chemisorption Lead Metal ions Metals Removal Thermodynamics Zinc Zinc compounds Biosorption copper lead metal ion zinc acidity article biomass biosorption calculation controlled study enthalpy entropy Gymnogongrus torulosus isotherm kinetics metal recovery nonhuman pH priority journal red alga scanning electron microscopy surface property temperature thermodynamics waste component removal waste water management Adsorption Cadmium Copper Kinetics Lead Particle Size Rhodophyta Seaweed Surface Properties Thermodynamics Zinc Gymnogongrus torulosus Gymnogongrus torulosus adsorption efficiency for cadmium(II), copper(II), lead(II) and zinc(II) were studied in batch mode in different acidic conditions. The adsorbent removal efficiency was determined as a function of contact time, initial metal ions concentration, pH and temperature. G. torulosus was characterized by SEM, water adsorption surface area and EDS. The Langmuir, Freundlich, Dubinin-Radushkevich and Temkin models have been applied and results showed that the biosorption process was better described by the Langmuir model. Kinetic experiments demonstrated that fast metal uptakes follow a pseudo-second-order kinetic model and that intra-particle diffusion and/or chemisorption were the rate-limiting steps. Experimental results show that G. torulosus isotherm followed the biosorption series, Cu > Cd ∼ Zn ∼ Pb. Biosorption capacities were affected by solution parameters. The maximum metal uptake (qmax) increased with increasing pH. The affinity constant, qmax, and the pseudo-second-order kinetic constants were calculated for the adsorption of all studied metals onto G. torulosus. The Gibbs free energy of the adsorption process as well as the process enthalpy and entropy were calculated from experimental results. © 2010 Elsevier B.V. Fil:Areco, M.M. Universidad de Buenos Aires. Facultad de Ciencias Exactas y Naturales; Argentina. JOUR info:eu-repo/semantics/openAccess http://creativecommons.org/licenses/by/2.5/ar http://hdl.handle.net/20.500.12110/paper_09277765_v81_n2_p620_Areco |
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Universidad de Buenos Aires |
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I-28 |
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R-134 |
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Biblioteca Digital - Facultad de Ciencias Exactas y Naturales (UBA) |
| topic |
Biosorption Gymnogongrus torulosus Kinetics Metal removal Acidic conditions Adsorption efficiency Adsorption process Affinity constants Batch modes Biosorption capacity Biosorption process Contact time Copper (ii) Dubinin-Radushkevich Freundlich Gymnogongrus torulosus Intra-particle diffusion Kinetic experiment Langmuir models Langmuirs Lead biosorption Metal removal Metal uptake Pseudo second order kinetics Pseudo-second-order kinetic models Rate-limiting steps Removal efficiencies SEM Solution parameters Surface area Temkin model Thermodynamics and kinetics Water adsorption Adsorption Cadmium Chemisorption Lead Metal ions Metals Removal Thermodynamics Zinc Zinc compounds Biosorption copper lead metal ion zinc acidity article biomass biosorption calculation controlled study enthalpy entropy Gymnogongrus torulosus isotherm kinetics metal recovery nonhuman pH priority journal red alga scanning electron microscopy surface property temperature thermodynamics waste component removal waste water management Adsorption Cadmium Copper Kinetics Lead Particle Size Rhodophyta Seaweed Surface Properties Thermodynamics Zinc Gymnogongrus torulosus |
| spellingShingle |
Biosorption Gymnogongrus torulosus Kinetics Metal removal Acidic conditions Adsorption efficiency Adsorption process Affinity constants Batch modes Biosorption capacity Biosorption process Contact time Copper (ii) Dubinin-Radushkevich Freundlich Gymnogongrus torulosus Intra-particle diffusion Kinetic experiment Langmuir models Langmuirs Lead biosorption Metal removal Metal uptake Pseudo second order kinetics Pseudo-second-order kinetic models Rate-limiting steps Removal efficiencies SEM Solution parameters Surface area Temkin model Thermodynamics and kinetics Water adsorption Adsorption Cadmium Chemisorption Lead Metal ions Metals Removal Thermodynamics Zinc Zinc compounds Biosorption copper lead metal ion zinc acidity article biomass biosorption calculation controlled study enthalpy entropy Gymnogongrus torulosus isotherm kinetics metal recovery nonhuman pH priority journal red alga scanning electron microscopy surface property temperature thermodynamics waste component removal waste water management Adsorption Cadmium Copper Kinetics Lead Particle Size Rhodophyta Seaweed Surface Properties Thermodynamics Zinc Gymnogongrus torulosus Areco, M.M. Dos Santos Afonso, M. Copper, zinc, cadmium and lead biosorption by Gymnogongrus torulosus. Thermodynamics and kinetics studies |
| topic_facet |
Biosorption Gymnogongrus torulosus Kinetics Metal removal Acidic conditions Adsorption efficiency Adsorption process Affinity constants Batch modes Biosorption capacity Biosorption process Contact time Copper (ii) Dubinin-Radushkevich Freundlich Gymnogongrus torulosus Intra-particle diffusion Kinetic experiment Langmuir models Langmuirs Lead biosorption Metal removal Metal uptake Pseudo second order kinetics Pseudo-second-order kinetic models Rate-limiting steps Removal efficiencies SEM Solution parameters Surface area Temkin model Thermodynamics and kinetics Water adsorption Adsorption Cadmium Chemisorption Lead Metal ions Metals Removal Thermodynamics Zinc Zinc compounds Biosorption copper lead metal ion zinc acidity article biomass biosorption calculation controlled study enthalpy entropy Gymnogongrus torulosus isotherm kinetics metal recovery nonhuman pH priority journal red alga scanning electron microscopy surface property temperature thermodynamics waste component removal waste water management Adsorption Cadmium Copper Kinetics Lead Particle Size Rhodophyta Seaweed Surface Properties Thermodynamics Zinc Gymnogongrus torulosus |
| description |
Gymnogongrus torulosus adsorption efficiency for cadmium(II), copper(II), lead(II) and zinc(II) were studied in batch mode in different acidic conditions. The adsorbent removal efficiency was determined as a function of contact time, initial metal ions concentration, pH and temperature. G. torulosus was characterized by SEM, water adsorption surface area and EDS. The Langmuir, Freundlich, Dubinin-Radushkevich and Temkin models have been applied and results showed that the biosorption process was better described by the Langmuir model. Kinetic experiments demonstrated that fast metal uptakes follow a pseudo-second-order kinetic model and that intra-particle diffusion and/or chemisorption were the rate-limiting steps. Experimental results show that G. torulosus isotherm followed the biosorption series, Cu > Cd ∼ Zn ∼ Pb. Biosorption capacities were affected by solution parameters. The maximum metal uptake (qmax) increased with increasing pH. The affinity constant, qmax, and the pseudo-second-order kinetic constants were calculated for the adsorption of all studied metals onto G. torulosus. The Gibbs free energy of the adsorption process as well as the process enthalpy and entropy were calculated from experimental results. © 2010 Elsevier B.V. |
| format |
JOUR |
| author |
Areco, M.M. Dos Santos Afonso, M. |
| author_facet |
Areco, M.M. Dos Santos Afonso, M. |
| author_sort |
Areco, M.M. |
| title |
Copper, zinc, cadmium and lead biosorption by Gymnogongrus torulosus. Thermodynamics and kinetics studies |
| title_short |
Copper, zinc, cadmium and lead biosorption by Gymnogongrus torulosus. Thermodynamics and kinetics studies |
| title_full |
Copper, zinc, cadmium and lead biosorption by Gymnogongrus torulosus. Thermodynamics and kinetics studies |
| title_fullStr |
Copper, zinc, cadmium and lead biosorption by Gymnogongrus torulosus. Thermodynamics and kinetics studies |
| title_full_unstemmed |
Copper, zinc, cadmium and lead biosorption by Gymnogongrus torulosus. Thermodynamics and kinetics studies |
| title_sort |
copper, zinc, cadmium and lead biosorption by gymnogongrus torulosus. thermodynamics and kinetics studies |
| url |
http://hdl.handle.net/20.500.12110/paper_09277765_v81_n2_p620_Areco |
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