The Experts below are selected from a list of 36 Experts worldwide ranked by ideXlab platform
Rafiqul Islam - One of the best experts on this subject based on the ideXlab platform.
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Extension of the pore diffusion approach for modelling binary adsorption of lead and arsenic ions in a fixed‐bed column packed with Atlantic Cod Fish scales
The Canadian Journal of Chemical Engineering, 2010Co-Authors: A. Basu, Saifur Rahaman, Rafiqul IslamAbstract:The removal of lead and arsenic ions using Atlantic Cod (Gadus morhua) Fish scale involves ion exchange, chemisorption, and precipitation of its constituents and is competitive with respect to adsorption onto the negatively charged heterogeneous substrates. The nonlinear sorption equilibrium concept is preceded by pore diffusion of the solute and is utilised for numerical modelling of this binary adsorption. Numerical simulation data demonstrate reasonable agreements with experimental results of dynamic column tests. Sensitivity analyses confirm that parameters such as porosity, adsorption coefficient, mobility of ions, and number of sorption sites contribute significantly to breakthrough interval of contaminant in dynamic columns. At lower pH values (7–8.04), the adsorption coefficients of cations such as lead are significantly lower than at pH value of 11.0. L'elimination des ions de plomb et d'arsenic grâce a l'utilisation des ecailles de morues de l'Atlantique (Gadus morhua) comprend des echanges ioniques, des adsorptions chimiques et la precipitation de ses composants. Cette methode est efficace par rapport a l'adsorption dans des substrats heterogenes negativement charges. Le concept de l'equilibre de la sorption non lineaire est precede par la diffusion interstitielle des solutes et est utilise pour creer des modeles numeriques de cette adsorption binaire. Les donnees de simulation numerique sont conformes aux resultats experimentaux des essais dynamiques en colonne. Les analyses de sensibilite confirment que des parametres tels que la porosite, le cœfficient d'adsorption, la mobilite ionique, ainsi qu'un certain nombre de sites de sorptions contribuent de maniere considerable a l'apparition d'intervalles de contaminant dans les tests dynamiques en colonnes.
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The removal of As(III) and As(V) from aqueous solutions by waste materials.
Bioresource technology, 2007Co-Authors: Saifur Rahaman, A. Basu, Rafiqul IslamAbstract:The use of different waste materials such as Atlantic Cod Fish scale, chicken fat, coconut fibre and charcoal in removing arsenic [As(III) and As(V)] from aqueous solutions was investigated. Initial experimental runs, conducted for both As(III) and As(V) with the aforementioned materials, demonstrated the potential of using Atlantic Cod Fish scale in removing both species of arsenic from aqueous streams. Therefore, the biosorbent Fish scale was selected for further investigations and various parameters such as residence time, adsorbent dose, initial concentration of adsorbate, grain size of the adsorbent and pH of the bulk phase were studied to establish optimum conditions. The maximum adsorption capacity was observed at pH value 4.0. The equilibrium adsorption data were interpreted by using both Freundlich and Langmuir models. Rapid small-scale column tests (RSSCT) were also performed to determine the breakthrough characteristics of the arsenic species with respect to packed biosorbent columns.
Paula M. L. Castro - One of the best experts on this subject based on the ideXlab platform.
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Hydroxyapatite-based materials of marine origin: A bioactivity and sintering study
Materials science & engineering. C Materials for biological applications, 2015Co-Authors: Clara Piccirillo, Robert C. Pullar, Elísio Costa, Alice Santos-silva, Manuela Pintado, Paula M. L. CastroAbstract:Single phase hydroxyapatite (HAp) and biphasic material hydroxyapatite/β-tricalcium phosphate (HAp/β-TCP) were obtained from a marine source (Atlantic Cod Fish bones). Here we report a study on the biological properties of these materials, including cytotoxicity, bioactivity and haemocompatibility. Results showed that the materials are not cytotoxic, neither in their powder nor in pellet form; indeed growth of Saos-2 cells was comparable to that of commercial. The haemolysis rate was lower than 2%; hence the materials can be classified as non-haemolytic. Moreover, when immersed in Simulated Body Fluid (SBF), crystal formation was observed on the surface of both materials. The sintering behaviour of the samples was also studied; both powders showed very high sinterability (density higher than 95% of the theoretical value). Overall, these results confirm the suitability of these materials for biomedical applications.
A. Basu - One of the best experts on this subject based on the ideXlab platform.
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extension of the pore diffusion approach for modelling binary adsorption of lead and arsenic ions in a fixed bed column packed with Atlantic Cod Fish scales
Canadian Journal of Chemical Engineering, 2011Co-Authors: A. Basu, Md Saifur Rahaman, M R IslamAbstract:The removal of lead and arsenic ions using Atlantic Cod (Gadus morhua) Fish scale involves ion exchange, chemisorption, and precipitation of its constituents and is competitive with respect to adsorption onto the negatively charged heterogeneous substrates. The nonlinear sorption equilibrium concept is preceded by pore diffusion of the solute and is utilised for numerical modelling of this binary adsorption. Numerical simulation data demonstrate reasonable agreements with experimental results of dynamic column tests. Sensitivity analyses confirm that parameters such as porosity, adsorption coefficient, mobility of ions, and number of sorption sites contribute significantly to breakthrough interval of contaminant in dynamic columns. At lower pH values (7–8.04), the adsorption coefficients of cations such as lead are significantly lower than at pH value of 11.0. L'elimination des ions de plomb et d'arsenic grâce a l'utilisation des ecailles de morues de l'Atlantique (Gadus morhua) comprend des echanges ioniques, des adsorptions chimiques et la precipitation de ses composants. Cette methode est efficace par rapport a l'adsorption dans des substrats heterogenes negativement charges. Le concept de l'equilibre de la sorption non lineaire est precede par la diffusion interstitielle des solutes et est utilise pour creer des modeles numeriques de cette adsorption binaire. Les donnees de simulation numerique sont conformes aux resultats experimentaux des essais dynamiques en colonne. Les analyses de sensibilite confirment que des parametres tels que la porosite, le cœfficient d'adsorption, la mobilite ionique, ainsi qu'un certain nombre de sites de sorptions contribuent de maniere considerable a l'apparition d'intervalles de contaminant dans les tests dynamiques en colonnes.
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Extension of the pore diffusion approach for modelling binary adsorption of lead and arsenic ions in a fixed‐bed column packed with Atlantic Cod Fish scales
The Canadian Journal of Chemical Engineering, 2010Co-Authors: A. Basu, Saifur Rahaman, Rafiqul IslamAbstract:The removal of lead and arsenic ions using Atlantic Cod (Gadus morhua) Fish scale involves ion exchange, chemisorption, and precipitation of its constituents and is competitive with respect to adsorption onto the negatively charged heterogeneous substrates. The nonlinear sorption equilibrium concept is preceded by pore diffusion of the solute and is utilised for numerical modelling of this binary adsorption. Numerical simulation data demonstrate reasonable agreements with experimental results of dynamic column tests. Sensitivity analyses confirm that parameters such as porosity, adsorption coefficient, mobility of ions, and number of sorption sites contribute significantly to breakthrough interval of contaminant in dynamic columns. At lower pH values (7–8.04), the adsorption coefficients of cations such as lead are significantly lower than at pH value of 11.0. L'elimination des ions de plomb et d'arsenic grâce a l'utilisation des ecailles de morues de l'Atlantique (Gadus morhua) comprend des echanges ioniques, des adsorptions chimiques et la precipitation de ses composants. Cette methode est efficace par rapport a l'adsorption dans des substrats heterogenes negativement charges. Le concept de l'equilibre de la sorption non lineaire est precede par la diffusion interstitielle des solutes et est utilise pour creer des modeles numeriques de cette adsorption binaire. Les donnees de simulation numerique sont conformes aux resultats experimentaux des essais dynamiques en colonne. Les analyses de sensibilite confirment que des parametres tels que la porosite, le cœfficient d'adsorption, la mobilite ionique, ainsi qu'un certain nombre de sites de sorptions contribuent de maniere considerable a l'apparition d'intervalles de contaminant dans les tests dynamiques en colonnes.
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The removal of As(III) and As(V) from aqueous solutions by waste materials.
Bioresource technology, 2007Co-Authors: Saifur Rahaman, A. Basu, Rafiqul IslamAbstract:The use of different waste materials such as Atlantic Cod Fish scale, chicken fat, coconut fibre and charcoal in removing arsenic [As(III) and As(V)] from aqueous solutions was investigated. Initial experimental runs, conducted for both As(III) and As(V) with the aforementioned materials, demonstrated the potential of using Atlantic Cod Fish scale in removing both species of arsenic from aqueous streams. Therefore, the biosorbent Fish scale was selected for further investigations and various parameters such as residence time, adsorbent dose, initial concentration of adsorbate, grain size of the adsorbent and pH of the bulk phase were studied to establish optimum conditions. The maximum adsorption capacity was observed at pH value 4.0. The equilibrium adsorption data were interpreted by using both Freundlich and Langmuir models. Rapid small-scale column tests (RSSCT) were also performed to determine the breakthrough characteristics of the arsenic species with respect to packed biosorbent columns.
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Batch studies of lead adsorption from a multi-component aqueous solution onto Atlantic Cod Fish scale (Gadus morhua) substrate
Journal of Environmental Engineering and Science, 2007Co-Authors: A. Basu, Saifur Rahaman, S Mustafiz, M R IslamAbstract:Aqueous streams often posses several contaminants that are of environmental concerns. Removing these contaminants from the multi-component phases is a challenging task. In this study, the multi-component (combination of lead and arsenic ions) batch adsorption results are analyzed with respect to initial concentrations of the contaminants (lead: 2.5, 10, and 40 mg/L; arsenic: 350 and 1000 μg/L) and pH variations (pH value of 4, 7, 9, and 11) of the bulk phase. The adsorbent selected for this research is Atlantic Cod (Gadus morhua) Fish scale. A general trend of reduced lead adsorptivity with increasing arsenic concentration is observed at the lower concentration of 2.5 mg/L of the heavy metal cation. The decrease in lead to arsenic concentration ratio in the bulk phase is correlated with an increase in "electrostatic attractions" or with "ion pair bridging" by the arsenic species on lead ions. However, at higher lead ion concentrations of 10 ppm and 40 ppm, the effect of arsenic on lead adsorption is insig...
Saifur Rahaman - One of the best experts on this subject based on the ideXlab platform.
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Extension of the pore diffusion approach for modelling binary adsorption of lead and arsenic ions in a fixed‐bed column packed with Atlantic Cod Fish scales
The Canadian Journal of Chemical Engineering, 2010Co-Authors: A. Basu, Saifur Rahaman, Rafiqul IslamAbstract:The removal of lead and arsenic ions using Atlantic Cod (Gadus morhua) Fish scale involves ion exchange, chemisorption, and precipitation of its constituents and is competitive with respect to adsorption onto the negatively charged heterogeneous substrates. The nonlinear sorption equilibrium concept is preceded by pore diffusion of the solute and is utilised for numerical modelling of this binary adsorption. Numerical simulation data demonstrate reasonable agreements with experimental results of dynamic column tests. Sensitivity analyses confirm that parameters such as porosity, adsorption coefficient, mobility of ions, and number of sorption sites contribute significantly to breakthrough interval of contaminant in dynamic columns. At lower pH values (7–8.04), the adsorption coefficients of cations such as lead are significantly lower than at pH value of 11.0. L'elimination des ions de plomb et d'arsenic grâce a l'utilisation des ecailles de morues de l'Atlantique (Gadus morhua) comprend des echanges ioniques, des adsorptions chimiques et la precipitation de ses composants. Cette methode est efficace par rapport a l'adsorption dans des substrats heterogenes negativement charges. Le concept de l'equilibre de la sorption non lineaire est precede par la diffusion interstitielle des solutes et est utilise pour creer des modeles numeriques de cette adsorption binaire. Les donnees de simulation numerique sont conformes aux resultats experimentaux des essais dynamiques en colonne. Les analyses de sensibilite confirment que des parametres tels que la porosite, le cœfficient d'adsorption, la mobilite ionique, ainsi qu'un certain nombre de sites de sorptions contribuent de maniere considerable a l'apparition d'intervalles de contaminant dans les tests dynamiques en colonnes.
-
The removal of As(III) and As(V) from aqueous solutions by waste materials.
Bioresource technology, 2007Co-Authors: Saifur Rahaman, A. Basu, Rafiqul IslamAbstract:The use of different waste materials such as Atlantic Cod Fish scale, chicken fat, coconut fibre and charcoal in removing arsenic [As(III) and As(V)] from aqueous solutions was investigated. Initial experimental runs, conducted for both As(III) and As(V) with the aforementioned materials, demonstrated the potential of using Atlantic Cod Fish scale in removing both species of arsenic from aqueous streams. Therefore, the biosorbent Fish scale was selected for further investigations and various parameters such as residence time, adsorbent dose, initial concentration of adsorbate, grain size of the adsorbent and pH of the bulk phase were studied to establish optimum conditions. The maximum adsorption capacity was observed at pH value 4.0. The equilibrium adsorption data were interpreted by using both Freundlich and Langmuir models. Rapid small-scale column tests (RSSCT) were also performed to determine the breakthrough characteristics of the arsenic species with respect to packed biosorbent columns.
-
Batch studies of lead adsorption from a multi-component aqueous solution onto Atlantic Cod Fish scale (Gadus morhua) substrate
Journal of Environmental Engineering and Science, 2007Co-Authors: A. Basu, Saifur Rahaman, S Mustafiz, M R IslamAbstract:Aqueous streams often posses several contaminants that are of environmental concerns. Removing these contaminants from the multi-component phases is a challenging task. In this study, the multi-component (combination of lead and arsenic ions) batch adsorption results are analyzed with respect to initial concentrations of the contaminants (lead: 2.5, 10, and 40 mg/L; arsenic: 350 and 1000 μg/L) and pH variations (pH value of 4, 7, 9, and 11) of the bulk phase. The adsorbent selected for this research is Atlantic Cod (Gadus morhua) Fish scale. A general trend of reduced lead adsorptivity with increasing arsenic concentration is observed at the lower concentration of 2.5 mg/L of the heavy metal cation. The decrease in lead to arsenic concentration ratio in the bulk phase is correlated with an increase in "electrostatic attractions" or with "ion pair bridging" by the arsenic species on lead ions. However, at higher lead ion concentrations of 10 ppm and 40 ppm, the effect of arsenic on lead adsorption is insig...
Clara Piccirillo - One of the best experts on this subject based on the ideXlab platform.
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Hydroxyapatite-based materials of marine origin: A bioactivity and sintering study
Materials science & engineering. C Materials for biological applications, 2015Co-Authors: Clara Piccirillo, Robert C. Pullar, Elísio Costa, Alice Santos-silva, Manuela Pintado, Paula M. L. CastroAbstract:Single phase hydroxyapatite (HAp) and biphasic material hydroxyapatite/β-tricalcium phosphate (HAp/β-TCP) were obtained from a marine source (Atlantic Cod Fish bones). Here we report a study on the biological properties of these materials, including cytotoxicity, bioactivity and haemocompatibility. Results showed that the materials are not cytotoxic, neither in their powder nor in pellet form; indeed growth of Saos-2 cells was comparable to that of commercial. The haemolysis rate was lower than 2%; hence the materials can be classified as non-haemolytic. Moreover, when immersed in Simulated Body Fluid (SBF), crystal formation was observed on the surface of both materials. The sintering behaviour of the samples was also studied; both powders showed very high sinterability (density higher than 95% of the theoretical value). Overall, these results confirm the suitability of these materials for biomedical applications.