Biosorption of metal ions on lignocellulosic materials: batch and continuous-flow process studies
| Autor: | Rizwan Ahmad, M. Mahmood-ul-Hassan, Vishandas Suthar, Munazza Yousra |
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| Rok vydání: | 2017 |
| Předmět: |
Chromium
Langmuir Metal ions in aqueous solution chemistry.chemical_element 02 engineering and technology 010501 environmental sciences Management Monitoring Policy and Law 01 natural sciences symbols.namesake Adsorption Metals Heavy Freundlich equation Cellulose 0105 earth and related environmental sciences General Environmental Science Ions Waste Products Chemistry Biosorption Langmuir adsorption model Sorption Agriculture General Medicine Hydrogen-Ion Concentration 021001 nanoscience & nanotechnology Pollution Saccharum Kinetics Models Chemical symbols 0210 nano-technology Water Pollutants Chemical Nuclear chemistry Cadmium Environmental Monitoring |
| Zdroj: | Environmental monitoring and assessment. 190(5) |
| ISSN: | 1573-2959 |
| Popis: | Metal adsorption capacities of bioadsorbents, derived from low-cost agricultural waste, were assessed. Batch and column experiments were conducted for evaluation of lead (Pb), cadmium (Cd), and chromium (Cr) sorption kinetics on to modified (by treating with base and acid) and unmodified sugarcane bagasse and corn cob. Langmuir, Freundlich, and Redlich–Peterson equations were used to understand metal adsorption behavior and Elovich and Lagergren’s pseudo-first-order and pseudo-second-order kinetics equations were used for estimation of adsorption kinetics parameter. The suitability of the models to experimental data was reflected by high r2 values. Among sorption models, Langmuir and Redlich–Peterson were proved equally good and Cd, Cr, and Pb adsorption process followed the Langmuir isotherm. Batch adsorption experiment showed that the metal adsorption ability of the treated materials was higher than that of untreated. The adsorption sequence was Pb > Cr > Cd. Pseudo-second-order kinetics model was found suitable in describing the obtained data. Result of the column adsorption experiments supplement the batch results and revealed the role of agricultural waste materials in remediation of heavy metal-polluted water. |
| Databáze: | OpenAIRE |
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