The valorization of activated carbon from stalks of Hibiscus sabdariffa. L. obtained by chemical ... more The valorization of activated carbon from stalks of Hibiscus sabdariffa. L. obtained by chemical activation using [H 3 PO 4 (PAAC) and KOH (PHAC)] followed by pyrolysis in the removal of copper from aqueous solution is reported. Samples were characterized by FTIR, XRD, SEM, Boehm method and pH ZPC , macronutrient content and the iodine number determination. Batch adsorption experiments were performed to study the effects of various parameters such as solution pH, contact time, carbonization temperature, initial adsorbate concentration and adsorbent mass at 27 o C. Analysis of macronutrient content of the Hibiscus sabdariffa. L. stalk yielded percentages of fixed carbon, moisture content, ash content and volatile matter equal to 70.36%, 3.90%, 6.28%, 19.46% respectively. Optimal conditions from equilibrium studies for the adsorption of copper(II) ions were as follows: contact times of 30 and 40 minutes for PAAC and PHAC respectively, pH=4.5 for both samples, adsorption capacities of 81.5mg/g for PAAC and 90.5 mg/g for PHAC. Adsorption isotherms were described by Langmuir, Freundlich and Temkin isotherm models. Equilibrium data were best represented by Langmuir isotherm model with monolayer adsorption capacities of 100.0 mg/g and 76.92 mg/g for PAAC and PHAC respectively. Kinetic studies revealed that adsorption rates followed pseudo-second order model. Hibiscus sabdariffa. L. stalks based activated carbons (HSSBAC) is shown to be a promising material for the adsorption of copper(II) ions from aqueous solutions.
The valorization of activated carbon from stalks of Hibiscus sabdariffa. L. obtained by chemical ... more The valorization of activated carbon from stalks of Hibiscus sabdariffa. L. obtained by chemical activation using [H 3 PO 4 (PAAC) and KOH (PHAC)] followed by pyrolysis in the removal of copper from aqueous solution is reported. Samples were characterized by FTIR, XRD, SEM, Boehm method and pH ZPC , macronutrient content and the iodine number determination. Batch adsorption experiments were performed to study the effects of various parameters such as solution pH, contact time, carbonization temperature, initial adsorbate concentration and adsorbent mass at 27 o C. Analysis of macronutrient content of the Hibiscus sabdariffa. L. stalk yielded percentages of fixed carbon, moisture content, ash content and volatile matter equal to 70.36%, 3.90%, 6.28%, 19.46% respectively. Optimal conditions from equilibrium studies for the adsorption of copper(II) ions were as follows: contact times of 30 and 40 minutes for PAAC and PHAC respectively, pH=4.5 for both samples, adsorption capacities of 81.5mg/g for PAAC and 90.5 mg/g for PHAC. Adsorption isotherms were described by Langmuir, Freundlich and Temkin isotherm models. Equilibrium data were best represented by Langmuir isotherm model with monolayer adsorption capacities of 100.0 mg/g and 76.92 mg/g for PAAC and PHAC respectively. Kinetic studies revealed that adsorption rates followed pseudo-second order model. Hibiscus sabdariffa. L. stalks based activated carbons (HSSBAC) is shown to be a promising material for the adsorption of copper(II) ions from aqueous solutions.
The valorization of activated carbon from stalks of Hibiscus sabdariffa. L. obtained by chemical ... more The valorization of activated carbon from stalks of Hibiscus sabdariffa. L. obtained by chemical activation using [H 3 PO 4 (PAAC) and KOH (PHAC)] followed by pyrolysis in the removal of copper from aqueous solution is reported. Samples were characterized by FTIR, XRD, SEM, Boehm method and pH ZPC , macronutrient content and the iodine number determination. Batch adsorption experiments were performed to study the effects of various parameters such as solution pH, contact time, carbonization temperature, initial adsorbate concentration and adsorbent mass at 27 o C. Analysis of macronutrient content of the Hibiscus sabdariffa. L. stalk yielded percentages of fixed carbon, moisture content, ash content and volatile matter equal to 70.36%, 3.90%, 6.28%, 19.46% respectively. Optimal conditions from equilibrium studies for the adsorption of copper(II) ions were as follows: contact times of 30 and 40 minutes for PAAC and PHAC respectively, pH=4.5 for both samples, adsorption capacities of 81.5mg/g for PAAC and 90.5 mg/g for PHAC. Adsorption isotherms were described by Langmuir, Freundlich and Temkin isotherm models. Equilibrium data were best represented by Langmuir isotherm model with monolayer adsorption capacities of 100.0 mg/g and 76.92 mg/g for PAAC and PHAC respectively. Kinetic studies revealed that adsorption rates followed pseudo-second order model. Hibiscus sabdariffa. L. stalks based activated carbons (HSSBAC) is shown to be a promising material for the adsorption of copper(II) ions from aqueous solutions.
The valorization of activated carbon from stalks of Hibiscus sabdariffa. L. obtained by chemical ... more The valorization of activated carbon from stalks of Hibiscus sabdariffa. L. obtained by chemical activation using [H 3 PO 4 (PAAC) and KOH (PHAC)] followed by pyrolysis in the removal of copper from aqueous solution is reported. Samples were characterized by FTIR, XRD, SEM, Boehm method and pH ZPC , macronutrient content and the iodine number determination. Batch adsorption experiments were performed to study the effects of various parameters such as solution pH, contact time, carbonization temperature, initial adsorbate concentration and adsorbent mass at 27 o C. Analysis of macronutrient content of the Hibiscus sabdariffa. L. stalk yielded percentages of fixed carbon, moisture content, ash content and volatile matter equal to 70.36%, 3.90%, 6.28%, 19.46% respectively. Optimal conditions from equilibrium studies for the adsorption of copper(II) ions were as follows: contact times of 30 and 40 minutes for PAAC and PHAC respectively, pH=4.5 for both samples, adsorption capacities of 81.5mg/g for PAAC and 90.5 mg/g for PHAC. Adsorption isotherms were described by Langmuir, Freundlich and Temkin isotherm models. Equilibrium data were best represented by Langmuir isotherm model with monolayer adsorption capacities of 100.0 mg/g and 76.92 mg/g for PAAC and PHAC respectively. Kinetic studies revealed that adsorption rates followed pseudo-second order model. Hibiscus sabdariffa. L. stalks based activated carbons (HSSBAC) is shown to be a promising material for the adsorption of copper(II) ions from aqueous solutions.
The valorization of activated carbon from stalks of Hibiscus sabdariffa. L. obtained by chemical ... more The valorization of activated carbon from stalks of Hibiscus sabdariffa. L. obtained by chemical activation using [H 3 PO 4 (PAAC) and KOH (PHAC)] followed by pyrolysis in the removal of copper from aqueous solution is reported. Samples were characterized by FTIR, XRD, SEM, Boehm method and pH ZPC , macronutrient content and the iodine number determination. Batch adsorption experiments were performed to study the effects of various parameters such as solution pH, contact time, carbonization temperature, initial adsorbate concentration and adsorbent mass at 27 o C. Analysis of macronutrient content of the Hibiscus sabdariffa. L. stalk yielded percentages of fixed carbon, moisture content, ash content and volatile matter equal to 70.36%, 3.90%, 6.28%, 19.46% respectively. Optimal conditions from equilibrium studies for the adsorption of copper(II) ions were as follows: contact times of 30 and 40 minutes for PAAC and PHAC respectively, pH=4.5 for both samples, adsorption capacities of 81.5mg/g for PAAC and 90.5 mg/g for PHAC. Adsorption isotherms were described by Langmuir, Freundlich and Temkin isotherm models. Equilibrium data were best represented by Langmuir isotherm model with monolayer adsorption capacities of 100.0 mg/g and 76.92 mg/g for PAAC and PHAC respectively. Kinetic studies revealed that adsorption rates followed pseudo-second order model. Hibiscus sabdariffa. L. stalks based activated carbons (HSSBAC) is shown to be a promising material for the adsorption of copper(II) ions from aqueous solutions.
The valorization of activated carbon from stalks of Hibiscus sabdariffa. L. obtained by chemical ... more The valorization of activated carbon from stalks of Hibiscus sabdariffa. L. obtained by chemical activation using [H 3 PO 4 (PAAC) and KOH (PHAC)] followed by pyrolysis in the removal of copper from aqueous solution is reported. Samples were characterized by FTIR, XRD, SEM, Boehm method and pH ZPC , macronutrient content and the iodine number determination. Batch adsorption experiments were performed to study the effects of various parameters such as solution pH, contact time, carbonization temperature, initial adsorbate concentration and adsorbent mass at 27 o C. Analysis of macronutrient content of the Hibiscus sabdariffa. L. stalk yielded percentages of fixed carbon, moisture content, ash content and volatile matter equal to 70.36%, 3.90%, 6.28%, 19.46% respectively. Optimal conditions from equilibrium studies for the adsorption of copper(II) ions were as follows: contact times of 30 and 40 minutes for PAAC and PHAC respectively, pH=4.5 for both samples, adsorption capacities of 81.5mg/g for PAAC and 90.5 mg/g for PHAC. Adsorption isotherms were described by Langmuir, Freundlich and Temkin isotherm models. Equilibrium data were best represented by Langmuir isotherm model with monolayer adsorption capacities of 100.0 mg/g and 76.92 mg/g for PAAC and PHAC respectively. Kinetic studies revealed that adsorption rates followed pseudo-second order model. Hibiscus sabdariffa. L. stalks based activated carbons (HSSBAC) is shown to be a promising material for the adsorption of copper(II) ions from aqueous solutions.
The valorization of activated carbon from stalks of Hibiscus sabdariffa. L. obtained by chemical ... more The valorization of activated carbon from stalks of Hibiscus sabdariffa. L. obtained by chemical activation using [H 3 PO 4 (PAAC) and KOH (PHAC)] followed by pyrolysis in the removal of copper from aqueous solution is reported. Samples were characterized by FTIR, XRD, SEM, Boehm method and pH ZPC , macronutrient content and the iodine number determination. Batch adsorption experiments were performed to study the effects of various parameters such as solution pH, contact time, carbonization temperature, initial adsorbate concentration and adsorbent mass at 27 o C. Analysis of macronutrient content of the Hibiscus sabdariffa. L. stalk yielded percentages of fixed carbon, moisture content, ash content and volatile matter equal to 70.36%, 3.90%, 6.28%, 19.46% respectively. Optimal conditions from equilibrium studies for the adsorption of copper(II) ions were as follows: contact times of 30 and 40 minutes for PAAC and PHAC respectively, pH=4.5 for both samples, adsorption capacities of 81.5mg/g for PAAC and 90.5 mg/g for PHAC. Adsorption isotherms were described by Langmuir, Freundlich and Temkin isotherm models. Equilibrium data were best represented by Langmuir isotherm model with monolayer adsorption capacities of 100.0 mg/g and 76.92 mg/g for PAAC and PHAC respectively. Kinetic studies revealed that adsorption rates followed pseudo-second order model. Hibiscus sabdariffa. L. stalks based activated carbons (HSSBAC) is shown to be a promising material for the adsorption of copper(II) ions from aqueous solutions.
The valorization of activated carbon from stalks of Hibiscus sabdariffa. L. obtained by chemical ... more The valorization of activated carbon from stalks of Hibiscus sabdariffa. L. obtained by chemical activation using [H 3 PO 4 (PAAC) and KOH (PHAC)] followed by pyrolysis in the removal of copper from aqueous solution is reported. Samples were characterized by FTIR, XRD, SEM, Boehm method and pH ZPC , macronutrient content and the iodine number determination. Batch adsorption experiments were performed to study the effects of various parameters such as solution pH, contact time, carbonization temperature, initial adsorbate concentration and adsorbent mass at 27 o C. Analysis of macronutrient content of the Hibiscus sabdariffa. L. stalk yielded percentages of fixed carbon, moisture content, ash content and volatile matter equal to 70.36%, 3.90%, 6.28%, 19.46% respectively. Optimal conditions from equilibrium studies for the adsorption of copper(II) ions were as follows: contact times of 30 and 40 minutes for PAAC and PHAC respectively, pH=4.5 for both samples, adsorption capacities of 81.5mg/g for PAAC and 90.5 mg/g for PHAC. Adsorption isotherms were described by Langmuir, Freundlich and Temkin isotherm models. Equilibrium data were best represented by Langmuir isotherm model with monolayer adsorption capacities of 100.0 mg/g and 76.92 mg/g for PAAC and PHAC respectively. Kinetic studies revealed that adsorption rates followed pseudo-second order model. Hibiscus sabdariffa. L. stalks based activated carbons (HSSBAC) is shown to be a promising material for the adsorption of copper(II) ions from aqueous solutions.
The valorization of activated carbon from stalks of Hibiscus sabdariffa. L. obtained by chemical ... more The valorization of activated carbon from stalks of Hibiscus sabdariffa. L. obtained by chemical activation using [H 3 PO 4 (PAAC) and KOH (PHAC)] followed by pyrolysis in the removal of copper from aqueous solution is reported. Samples were characterized by FTIR, XRD, SEM, Boehm method and pH ZPC , macronutrient content and the iodine number determination. Batch adsorption experiments were performed to study the effects of various parameters such as solution pH, contact time, carbonization temperature, initial adsorbate concentration and adsorbent mass at 27 o C. Analysis of macronutrient content of the Hibiscus sabdariffa. L. stalk yielded percentages of fixed carbon, moisture content, ash content and volatile matter equal to 70.36%, 3.90%, 6.28%, 19.46% respectively. Optimal conditions from equilibrium studies for the adsorption of copper(II) ions were as follows: contact times of 30 and 40 minutes for PAAC and PHAC respectively, pH=4.5 for both samples, adsorption capacities of 81.5mg/g for PAAC and 90.5 mg/g for PHAC. Adsorption isotherms were described by Langmuir, Freundlich and Temkin isotherm models. Equilibrium data were best represented by Langmuir isotherm model with monolayer adsorption capacities of 100.0 mg/g and 76.92 mg/g for PAAC and PHAC respectively. Kinetic studies revealed that adsorption rates followed pseudo-second order model. Hibiscus sabdariffa. L. stalks based activated carbons (HSSBAC) is shown to be a promising material for the adsorption of copper(II) ions from aqueous solutions.
The valorization of activated carbon from stalks of Hibiscus sabdariffa. L. obtained by chemical ... more The valorization of activated carbon from stalks of Hibiscus sabdariffa. L. obtained by chemical activation using [H 3 PO 4 (PAAC) and KOH (PHAC)] followed by pyrolysis in the removal of copper from aqueous solution is reported. Samples were characterized by FTIR, XRD, SEM, Boehm method and pH ZPC , macronutrient content and the iodine number determination. Batch adsorption experiments were performed to study the effects of various parameters such as solution pH, contact time, carbonization temperature, initial adsorbate concentration and adsorbent mass at 27 o C. Analysis of macronutrient content of the Hibiscus sabdariffa. L. stalk yielded percentages of fixed carbon, moisture content, ash content and volatile matter equal to 70.36%, 3.90%, 6.28%, 19.46% respectively. Optimal conditions from equilibrium studies for the adsorption of copper(II) ions were as follows: contact times of 30 and 40 minutes for PAAC and PHAC respectively, pH=4.5 for both samples, adsorption capacities of 81.5mg/g for PAAC and 90.5 mg/g for PHAC. Adsorption isotherms were described by Langmuir, Freundlich and Temkin isotherm models. Equilibrium data were best represented by Langmuir isotherm model with monolayer adsorption capacities of 100.0 mg/g and 76.92 mg/g for PAAC and PHAC respectively. Kinetic studies revealed that adsorption rates followed pseudo-second order model. Hibiscus sabdariffa. L. stalks based activated carbons (HSSBAC) is shown to be a promising material for the adsorption of copper(II) ions from aqueous solutions.
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