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Sulphide Removal from Water Through Electrocoagulation: Kinetics, Equilibrium and Thermodynamic Analysis
https://orcid.org/http://orcid.org/0000-0002-6476-1509
The current study covers the effect of operating parameters on electrocoagulation (EC) process with Al and Fe electrodes in terms of sulphide reduction. Maximum sulphide reductions of 82% and 87% were noted for Al and Fe electrodes, at optimum operating conditions for initial concentration of 600 mg/L. The sulphide removal mechanism of both electrodes was validated using Langmuir, Freundlich, Hill, Temkin, Elovich and Jossens isotherm models. The Langmuir adsorption isotherm suggests the best fitting with coefficient of regression (R2) of 0.996 and 0.997 for both electrodes, respectively, suggesting monolayer coverage of adsorbed molecules. The kinetic study suggests that the adsorption mechanism during EC process follows second-order kinetics for both electrodes. The thermodynamic study showed that the adsorption of sulphide onto hydroxide formed during EC process was feasible, spontaneous and endothermic in the temperature range of 15–40 °C. The heat of enthalpy during EC process was 41.319 and 50.878 kJ/mol for both electrodes and standard Gibb’s free energy was 4.203 and 3.946 kJ/mol for both electrodes at 25 °C temperature. The activation energy for Al and Fe electrodes was 22.315 and 44.846 kJ/mol, indicating domination of activated chemisorption phenomena during EC process.
Sulphide Removal from Water Through Electrocoagulation: Kinetics, Equilibrium and Thermodynamic Analysis
https://orcid.org/http://orcid.org/0000-0002-6476-1509
The current study covers the effect of operating parameters on electrocoagulation (EC) process with Al and Fe electrodes in terms of sulphide reduction. Maximum sulphide reductions of 82% and 87% were noted for Al and Fe electrodes, at optimum operating conditions for initial concentration of 600 mg/L. The sulphide removal mechanism of both electrodes was validated using Langmuir, Freundlich, Hill, Temkin, Elovich and Jossens isotherm models. The Langmuir adsorption isotherm suggests the best fitting with coefficient of regression (R2) of 0.996 and 0.997 for both electrodes, respectively, suggesting monolayer coverage of adsorbed molecules. The kinetic study suggests that the adsorption mechanism during EC process follows second-order kinetics for both electrodes. The thermodynamic study showed that the adsorption of sulphide onto hydroxide formed during EC process was feasible, spontaneous and endothermic in the temperature range of 15–40 °C. The heat of enthalpy during EC process was 41.319 and 50.878 kJ/mol for both electrodes and standard Gibb’s free energy was 4.203 and 3.946 kJ/mol for both electrodes at 25 °C temperature. The activation energy for Al and Fe electrodes was 22.315 and 44.846 kJ/mol, indicating domination of activated chemisorption phenomena during EC process.
Sulphide Removal from Water Through Electrocoagulation: Kinetics, Equilibrium and Thermodynamic Analysis
https://orcid.org/http://orcid.org/0000-0002-6476-1509
The current study covers the effect of operating parameters on electrocoagulation (EC) process with Al and Fe electrodes in terms of sulphide reduction. Maximum sulphide reductions of 82% and 87% were noted for Al and Fe electrodes, at optimum operating conditions for initial concentration of 600 mg/L. The sulphide removal mechanism of both electrodes was validated using Langmuir, Freundlich, Hill, Temkin, Elovich and Jossens isotherm models. The Langmuir adsorption isotherm suggests the best fitting with coefficient of regression (R2) of 0.996 and 0.997 for both electrodes, respectively, suggesting monolayer coverage of adsorbed molecules. The kinetic study suggests that the adsorption mechanism during EC process follows second-order kinetics for both electrodes. The thermodynamic study showed that the adsorption of sulphide onto hydroxide formed during EC process was feasible, spontaneous and endothermic in the temperature range of 15–40 °C. The heat of enthalpy during EC process was 41.319 and 50.878 kJ/mol for both electrodes and standard Gibb’s free energy was 4.203 and 3.946 kJ/mol for both electrodes at 25 °C temperature. The activation energy for Al and Fe electrodes was 22.315 and 44.846 kJ/mol, indicating domination of activated chemisorption phenomena during EC process.
Sulphide Removal from Water Through Electrocoagulation: Kinetics, Equilibrium and Thermodynamic Analysis
J. Inst. Eng. India Ser. A
Shankar, Ravi (author) / Sharan, Shambhoo (author) / Varma, Anil Kumar (author) / Mondal, Prasenjit (author) / Chand, Shri (author) / Thakur, Lokendra Singh (author) / Pande, Poorn Prakash (author) / Yadav, Vinod Kumar (author)
Journal of The Institution of Engineers (India): Series A ; 102 ; 603-621
2021-06-01
19 pages
Article (Journal)
Electronic Resource
English
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