Batch and continuous fixed bed adsorption of heavy metals removal using activated charcoal from neem (Azadirachta indica) leaf powder
Autor: | Himanshu J. Patel |
---|---|
Jazyk: | angličtina |
Rok vydání: | 2020 |
Předmět: |
Pollution remediation
Correlation coefficient Kinetics Ionic bonding lcsh:Medicine 02 engineering and technology 010501 environmental sciences 01 natural sciences Endothermic process Article Water Purification Metal Adsorption Metals Heavy lcsh:Science 0105 earth and related environmental sciences Azadirachta Multidisciplinary Chemistry lcsh:R 021001 nanoscience & nanotechnology Volumetric flow rate Plant Leaves Activated charcoal Charcoal visual_art Environmental chemistry visual_art.visual_art_medium Thermodynamics lcsh:Q Powders 0210 nano-technology Water Pollutants Chemical Nuclear chemistry |
Zdroj: | Scientific Reports, Vol 10, Iss 1, Pp 1-12 (2020) Scientific Reports |
ISSN: | 2045-2322 |
Popis: | The present investigate was intended for adsorption of heavy metals i.e. Pb, Cu, Cr, Zn, Ni and Cd onto activated charcoal prepared from neem leaf powder (AC-NLP) using batch and column studies. Batch adsorption was performed using different variables like adsorbent dose, temperature and contact duration. Thermodynamic analysis of batch treatment concluded that adsorption is thermodynamically feasible and endothermic. This adsorption followed the Pseudo second-order kinetic model derived from correlation coefficient values of chemical kinetic studies. For column study, interpretation of breakthrough curves and parameters were conducted by varying flow rate, initial concentration and bed height; and reveal that optimum conditions were lower flow rate (5 mL/min) and lower initial concentration (5 mg/L) and higher bed height (20 cm). Comparisons of batch and column study through isotherm models were evaluated and column study is more preferred than batch treatment. Maximum Thomas adsorption capacity was achieved upto 205.6, 185.8, 154.5, 133.3, 120.6, 110.9 mg/g for Pb, Cu, Cd, Zn, Ni and Cr respectively. This removal pattern is elucidated by metal ionic properties. Various adsorbing agents such as acids and bases were utilized for adsorption–desorption of AC-NLP. |
Databáze: | OpenAIRE |
Externí odkaz: | |
Nepřihlášeným uživatelům se plný text nezobrazuje | K zobrazení výsledku je třeba se přihlásit. |