The Experts below are selected from a list of 141 Experts worldwide ranked by ideXlab platform
Sari Kilpimaa - One of the best experts on this subject based on the ideXlab platform.
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physical activation of Carbon Residue from biomass gasification novel sorbent for the removal of phosphates and nitrates from aqueous solution
Journal of Industrial and Engineering Chemistry, 2015Co-Authors: Sari Kilpimaa, Hanna Runtti, Teija Kangas, Ulla Lassi, Toivo KuokkanenAbstract:Abstract Carbon Residue obtained as a by-product from wood gasification process was employed as a precursor for preparing adsorbent by physical activation. Adsorbent with BET surface area 590 m 2 g −1 and pore volume of 0.335 cm 3 g −1 was prepared and used as an adsorbent for phosphate and nitrate removal. The optimal pH and initial concentrations for phosphate and nitrate removal were determined. The kinetics showed that the adsorption data followed pseudo-second-order kinetics. The isotherm analysis indicated that the adsorption data can be represented by the Langmuir model. Results showed that activated Carbon Residue is suitable adsorbent for phosphate removal.
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removal of phosphate and nitrate over a modified Carbon Residue from biomass gasification
Chemical Engineering Research & Design, 2014Co-Authors: Sari Kilpimaa, Hanna Runtti, Teija Kangas, Ulla Lassi, Toivo KuokkaneAbstract:Abstract Carbon Residue is a by-product from the biomass gasification process in which heat and power are generated. In this study, Carbon Residue was chemically activated and the effect of this activation process on the adsorption properties was investigated. A chemically activated Carbon Residue was used as an adsorbent for the removal of phosphate and nitrate in an aqueous solution. The general idea is that the Carbon Residue could first be used as a low cost adsorbent for phosphate and nitrate ions removal, e.g. from wastewaters, and after that it could be used as a nitrogen and phosphorus rich forest fertiliser. Based on the results, the most effective pH value for phosphate removal was 6, 4 and 6 for activated Carbon Residue, Carbon Residue and activated Carbon respectively. Optimum pH value for nitrate removal was 6 for activated Carbon Residue and Carbon Residue, and 4 for activated Carbon. The optimum concentrations for the initial phosphate solutions for activated Carbon Residue, Carbon Residue and activated Carbon were 25, 50 and 25 mg L−1 respectively. For nitrate, the optimal concentration was 25 mg L−1 for all adsorbents. Phosphate and nitrate adsorption kinetics were well fitted by the pseudo-second-order kinetic model for all studied adsorbents. Phosphate and nitrate adsorption onto activated Carbon Residue obey well Langmuir adsorption isotherm.
Hanna Runtti - One of the best experts on this subject based on the ideXlab platform.
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physical activation of Carbon Residue from biomass gasification novel sorbent for the removal of phosphates and nitrates from aqueous solution
Journal of Industrial and Engineering Chemistry, 2015Co-Authors: Sari Kilpimaa, Hanna Runtti, Teija Kangas, Ulla Lassi, Toivo KuokkanenAbstract:Abstract Carbon Residue obtained as a by-product from wood gasification process was employed as a precursor for preparing adsorbent by physical activation. Adsorbent with BET surface area 590 m 2 g −1 and pore volume of 0.335 cm 3 g −1 was prepared and used as an adsorbent for phosphate and nitrate removal. The optimal pH and initial concentrations for phosphate and nitrate removal were determined. The kinetics showed that the adsorption data followed pseudo-second-order kinetics. The isotherm analysis indicated that the adsorption data can be represented by the Langmuir model. Results showed that activated Carbon Residue is suitable adsorbent for phosphate removal.
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chemically activated Carbon Residue from biomass gasification as a sorbent for iron ii copper ii and nickel ii ions
Journal of water process engineering, 2014Co-Authors: Hanna Runtti, Teija Kangas, Ulla Lassi, Toivo Kuokkane, Sari Tuomikoski, Jaakko RamoAbstract:Abstract The main goal of this research was to investigate the possibility of the utilization of Carbon Residue from biomass gasification process with and without chemical activation as a low cost sorbent for iron(II), copper(II) and nickel(II) ions from an aqueous solution. Commercial activated Carbon was used as a reference sample. Batch experiments were done to evaluate the influence of pH, initial metal concentration and contact time. The optimum pH required for maximum adsorption was found to be 4, 5 and 8, for iron, copper and nickel, respectively. According to the results, the removal of metals by Carbon Residue with and without chemical activation was higher than commercial activated Carbon. The highest maximum experimental sorption capacities ( q m ,exp ) for iron, copper and nickel by activated Carbon Residue were 21, 23 and 18 mg g −1 , respectively. The experimental equilibrium sorption data were tested for the Langmuir, Freundlich and Dubinin–Radushkevich (D–R) equations. Depending on the system the Langmuir or Freundlich isotherms have been found to provide the best correlation. The kinetics of iron, copper and nickel sorption by different adsorbent materials followed the pseudo-second-order model. Other tested kinetic models were the pseudo-first-order and the Elovich models. Weber Morris's intraparticle diffusion model showed that there are two or three different stages for the removal of metals.
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removal of phosphate and nitrate over a modified Carbon Residue from biomass gasification
Chemical Engineering Research & Design, 2014Co-Authors: Sari Kilpimaa, Hanna Runtti, Teija Kangas, Ulla Lassi, Toivo KuokkaneAbstract:Abstract Carbon Residue is a by-product from the biomass gasification process in which heat and power are generated. In this study, Carbon Residue was chemically activated and the effect of this activation process on the adsorption properties was investigated. A chemically activated Carbon Residue was used as an adsorbent for the removal of phosphate and nitrate in an aqueous solution. The general idea is that the Carbon Residue could first be used as a low cost adsorbent for phosphate and nitrate ions removal, e.g. from wastewaters, and after that it could be used as a nitrogen and phosphorus rich forest fertiliser. Based on the results, the most effective pH value for phosphate removal was 6, 4 and 6 for activated Carbon Residue, Carbon Residue and activated Carbon respectively. Optimum pH value for nitrate removal was 6 for activated Carbon Residue and Carbon Residue, and 4 for activated Carbon. The optimum concentrations for the initial phosphate solutions for activated Carbon Residue, Carbon Residue and activated Carbon were 25, 50 and 25 mg L−1 respectively. For nitrate, the optimal concentration was 25 mg L−1 for all adsorbents. Phosphate and nitrate adsorption kinetics were well fitted by the pseudo-second-order kinetic model for all studied adsorbents. Phosphate and nitrate adsorption onto activated Carbon Residue obey well Langmuir adsorption isotherm.
Teija Kangas - One of the best experts on this subject based on the ideXlab platform.
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physical activation of Carbon Residue from biomass gasification novel sorbent for the removal of phosphates and nitrates from aqueous solution
Journal of Industrial and Engineering Chemistry, 2015Co-Authors: Sari Kilpimaa, Hanna Runtti, Teija Kangas, Ulla Lassi, Toivo KuokkanenAbstract:Abstract Carbon Residue obtained as a by-product from wood gasification process was employed as a precursor for preparing adsorbent by physical activation. Adsorbent with BET surface area 590 m 2 g −1 and pore volume of 0.335 cm 3 g −1 was prepared and used as an adsorbent for phosphate and nitrate removal. The optimal pH and initial concentrations for phosphate and nitrate removal were determined. The kinetics showed that the adsorption data followed pseudo-second-order kinetics. The isotherm analysis indicated that the adsorption data can be represented by the Langmuir model. Results showed that activated Carbon Residue is suitable adsorbent for phosphate removal.
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chemically activated Carbon Residue from biomass gasification as a sorbent for iron ii copper ii and nickel ii ions
Journal of water process engineering, 2014Co-Authors: Hanna Runtti, Teija Kangas, Ulla Lassi, Toivo Kuokkane, Sari Tuomikoski, Jaakko RamoAbstract:Abstract The main goal of this research was to investigate the possibility of the utilization of Carbon Residue from biomass gasification process with and without chemical activation as a low cost sorbent for iron(II), copper(II) and nickel(II) ions from an aqueous solution. Commercial activated Carbon was used as a reference sample. Batch experiments were done to evaluate the influence of pH, initial metal concentration and contact time. The optimum pH required for maximum adsorption was found to be 4, 5 and 8, for iron, copper and nickel, respectively. According to the results, the removal of metals by Carbon Residue with and without chemical activation was higher than commercial activated Carbon. The highest maximum experimental sorption capacities ( q m ,exp ) for iron, copper and nickel by activated Carbon Residue were 21, 23 and 18 mg g −1 , respectively. The experimental equilibrium sorption data were tested for the Langmuir, Freundlich and Dubinin–Radushkevich (D–R) equations. Depending on the system the Langmuir or Freundlich isotherms have been found to provide the best correlation. The kinetics of iron, copper and nickel sorption by different adsorbent materials followed the pseudo-second-order model. Other tested kinetic models were the pseudo-first-order and the Elovich models. Weber Morris's intraparticle diffusion model showed that there are two or three different stages for the removal of metals.
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removal of phosphate and nitrate over a modified Carbon Residue from biomass gasification
Chemical Engineering Research & Design, 2014Co-Authors: Sari Kilpimaa, Hanna Runtti, Teija Kangas, Ulla Lassi, Toivo KuokkaneAbstract:Abstract Carbon Residue is a by-product from the biomass gasification process in which heat and power are generated. In this study, Carbon Residue was chemically activated and the effect of this activation process on the adsorption properties was investigated. A chemically activated Carbon Residue was used as an adsorbent for the removal of phosphate and nitrate in an aqueous solution. The general idea is that the Carbon Residue could first be used as a low cost adsorbent for phosphate and nitrate ions removal, e.g. from wastewaters, and after that it could be used as a nitrogen and phosphorus rich forest fertiliser. Based on the results, the most effective pH value for phosphate removal was 6, 4 and 6 for activated Carbon Residue, Carbon Residue and activated Carbon respectively. Optimum pH value for nitrate removal was 6 for activated Carbon Residue and Carbon Residue, and 4 for activated Carbon. The optimum concentrations for the initial phosphate solutions for activated Carbon Residue, Carbon Residue and activated Carbon were 25, 50 and 25 mg L−1 respectively. For nitrate, the optimal concentration was 25 mg L−1 for all adsorbents. Phosphate and nitrate adsorption kinetics were well fitted by the pseudo-second-order kinetic model for all studied adsorbents. Phosphate and nitrate adsorption onto activated Carbon Residue obey well Langmuir adsorption isotherm.
Ulla Lassi - One of the best experts on this subject based on the ideXlab platform.
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physical activation of Carbon Residue from biomass gasification novel sorbent for the removal of phosphates and nitrates from aqueous solution
Journal of Industrial and Engineering Chemistry, 2015Co-Authors: Sari Kilpimaa, Hanna Runtti, Teija Kangas, Ulla Lassi, Toivo KuokkanenAbstract:Abstract Carbon Residue obtained as a by-product from wood gasification process was employed as a precursor for preparing adsorbent by physical activation. Adsorbent with BET surface area 590 m 2 g −1 and pore volume of 0.335 cm 3 g −1 was prepared and used as an adsorbent for phosphate and nitrate removal. The optimal pH and initial concentrations for phosphate and nitrate removal were determined. The kinetics showed that the adsorption data followed pseudo-second-order kinetics. The isotherm analysis indicated that the adsorption data can be represented by the Langmuir model. Results showed that activated Carbon Residue is suitable adsorbent for phosphate removal.
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chemically activated Carbon Residue from biomass gasification as a sorbent for iron ii copper ii and nickel ii ions
Journal of water process engineering, 2014Co-Authors: Hanna Runtti, Teija Kangas, Ulla Lassi, Toivo Kuokkane, Sari Tuomikoski, Jaakko RamoAbstract:Abstract The main goal of this research was to investigate the possibility of the utilization of Carbon Residue from biomass gasification process with and without chemical activation as a low cost sorbent for iron(II), copper(II) and nickel(II) ions from an aqueous solution. Commercial activated Carbon was used as a reference sample. Batch experiments were done to evaluate the influence of pH, initial metal concentration and contact time. The optimum pH required for maximum adsorption was found to be 4, 5 and 8, for iron, copper and nickel, respectively. According to the results, the removal of metals by Carbon Residue with and without chemical activation was higher than commercial activated Carbon. The highest maximum experimental sorption capacities ( q m ,exp ) for iron, copper and nickel by activated Carbon Residue were 21, 23 and 18 mg g −1 , respectively. The experimental equilibrium sorption data were tested for the Langmuir, Freundlich and Dubinin–Radushkevich (D–R) equations. Depending on the system the Langmuir or Freundlich isotherms have been found to provide the best correlation. The kinetics of iron, copper and nickel sorption by different adsorbent materials followed the pseudo-second-order model. Other tested kinetic models were the pseudo-first-order and the Elovich models. Weber Morris's intraparticle diffusion model showed that there are two or three different stages for the removal of metals.
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removal of phosphate and nitrate over a modified Carbon Residue from biomass gasification
Chemical Engineering Research & Design, 2014Co-Authors: Sari Kilpimaa, Hanna Runtti, Teija Kangas, Ulla Lassi, Toivo KuokkaneAbstract:Abstract Carbon Residue is a by-product from the biomass gasification process in which heat and power are generated. In this study, Carbon Residue was chemically activated and the effect of this activation process on the adsorption properties was investigated. A chemically activated Carbon Residue was used as an adsorbent for the removal of phosphate and nitrate in an aqueous solution. The general idea is that the Carbon Residue could first be used as a low cost adsorbent for phosphate and nitrate ions removal, e.g. from wastewaters, and after that it could be used as a nitrogen and phosphorus rich forest fertiliser. Based on the results, the most effective pH value for phosphate removal was 6, 4 and 6 for activated Carbon Residue, Carbon Residue and activated Carbon respectively. Optimum pH value for nitrate removal was 6 for activated Carbon Residue and Carbon Residue, and 4 for activated Carbon. The optimum concentrations for the initial phosphate solutions for activated Carbon Residue, Carbon Residue and activated Carbon were 25, 50 and 25 mg L−1 respectively. For nitrate, the optimal concentration was 25 mg L−1 for all adsorbents. Phosphate and nitrate adsorption kinetics were well fitted by the pseudo-second-order kinetic model for all studied adsorbents. Phosphate and nitrate adsorption onto activated Carbon Residue obey well Langmuir adsorption isotherm.
Toivo Kuokkane - One of the best experts on this subject based on the ideXlab platform.
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chemically activated Carbon Residue from biomass gasification as a sorbent for iron ii copper ii and nickel ii ions
Journal of water process engineering, 2014Co-Authors: Hanna Runtti, Teija Kangas, Ulla Lassi, Toivo Kuokkane, Sari Tuomikoski, Jaakko RamoAbstract:Abstract The main goal of this research was to investigate the possibility of the utilization of Carbon Residue from biomass gasification process with and without chemical activation as a low cost sorbent for iron(II), copper(II) and nickel(II) ions from an aqueous solution. Commercial activated Carbon was used as a reference sample. Batch experiments were done to evaluate the influence of pH, initial metal concentration and contact time. The optimum pH required for maximum adsorption was found to be 4, 5 and 8, for iron, copper and nickel, respectively. According to the results, the removal of metals by Carbon Residue with and without chemical activation was higher than commercial activated Carbon. The highest maximum experimental sorption capacities ( q m ,exp ) for iron, copper and nickel by activated Carbon Residue were 21, 23 and 18 mg g −1 , respectively. The experimental equilibrium sorption data were tested for the Langmuir, Freundlich and Dubinin–Radushkevich (D–R) equations. Depending on the system the Langmuir or Freundlich isotherms have been found to provide the best correlation. The kinetics of iron, copper and nickel sorption by different adsorbent materials followed the pseudo-second-order model. Other tested kinetic models were the pseudo-first-order and the Elovich models. Weber Morris's intraparticle diffusion model showed that there are two or three different stages for the removal of metals.
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removal of phosphate and nitrate over a modified Carbon Residue from biomass gasification
Chemical Engineering Research & Design, 2014Co-Authors: Sari Kilpimaa, Hanna Runtti, Teija Kangas, Ulla Lassi, Toivo KuokkaneAbstract:Abstract Carbon Residue is a by-product from the biomass gasification process in which heat and power are generated. In this study, Carbon Residue was chemically activated and the effect of this activation process on the adsorption properties was investigated. A chemically activated Carbon Residue was used as an adsorbent for the removal of phosphate and nitrate in an aqueous solution. The general idea is that the Carbon Residue could first be used as a low cost adsorbent for phosphate and nitrate ions removal, e.g. from wastewaters, and after that it could be used as a nitrogen and phosphorus rich forest fertiliser. Based on the results, the most effective pH value for phosphate removal was 6, 4 and 6 for activated Carbon Residue, Carbon Residue and activated Carbon respectively. Optimum pH value for nitrate removal was 6 for activated Carbon Residue and Carbon Residue, and 4 for activated Carbon. The optimum concentrations for the initial phosphate solutions for activated Carbon Residue, Carbon Residue and activated Carbon were 25, 50 and 25 mg L−1 respectively. For nitrate, the optimal concentration was 25 mg L−1 for all adsorbents. Phosphate and nitrate adsorption kinetics were well fitted by the pseudo-second-order kinetic model for all studied adsorbents. Phosphate and nitrate adsorption onto activated Carbon Residue obey well Langmuir adsorption isotherm.