Sulphide Removal from Water Through Electrocoagulation: Kinetics, Equilibrium and Thermodynamic Analysis
| Autor: | Lokendra Singh Thakur, Prasenjit Mondal, Poorn Prakash Pande, Ravi Shankar, Shri Chand, Vinod Kumar Yadav, Shambhoo Sharan, Anil Kumar Varma |
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| Rok vydání: | 2021 |
| Předmět: |
Langmuir
Materials science Mechanical Engineering Enthalpy Inorganic chemistry 0211 other engineering and technologies Langmuir adsorption model 020101 civil engineering 02 engineering and technology Building and Construction Agricultural and Biological Sciences (miscellaneous) Endothermic process 0201 civil engineering chemistry.chemical_compound symbols.namesake Adsorption chemistry Chemisorption 021105 building & construction Architecture symbols Hydroxide Freundlich equation Civil and Structural Engineering |
| Zdroj: | Journal of The Institution of Engineers (India): Series A. 102:603-621 |
| ISSN: | 2250-2157 2250-2149 |
| DOI: | 10.1007/s40030-021-00536-x |
| Popis: | 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. |
| Databáze: | OpenAIRE |
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