Sulfate radical anion activated agro-industrial residues for Cr(VI) adsorption: is this activation process technically and economically feasible?
| Autor: | Luz M. Ballesteros, Aldair Vergel Rangel, D. Fabio Mercado, Hernando Guerrero-Amaya, Mariana Guerrero Becerra |
|---|---|
| Rok vydání: | 2021 |
| Předmět: |
Renewable Energy
Sustainability and the Environment Sulfate radical Chemistry 020209 energy Strategy and Management 05 social sciences Inorganic chemistry 02 engineering and technology Building and Construction Industrial and Manufacturing Engineering Ion Electrophoresis chemistry.chemical_compound Adsorption Scientific method 050501 criminology 0202 electrical engineering electronic engineering information engineering Ground coffee Surface charge Hexavalent chromium 0505 law General Environmental Science |
| Zdroj: | Journal of Cleaner Production. 289:125793 |
| ISSN: | 0959-6526 |
| DOI: | 10.1016/j.jclepro.2021.125793 |
| Popis: | Three low-cost and abundant agro-industrial residues have been used as hexavalent chromium adsorbents. Blackberry residues and spent ground coffee were the most efficient adsorbents with 10.6 ± 5.9 and 9.7 ± 3.0 mg g−1 maximum adsorption uptake, respectively. With a capacity of 1.4 ± 0.1 mg g−1, avocado seeds showed the lowest adsorption efficiency, all at pH = 5.5. These three solids were treated with a new sulfate radical anion and low temperature-based oxidation process. The particles’ characterization showed no modification in the surface area nor the textural properties but the surface chemistry changes. The electrophoretic mobility, infrared, and energy-dispersive X-ray spectroscopies showed modifications in the surface charge and functional groups due to the oxidation-mediated activation process. Upon activation, not all materials increase their adsorption capacity, and experimental correlations were made to understand this behavior. However, the activated avocado seeds have a maximum adsorption uptake of (31.6 ± 7.4) mg g−1, comparable to activated carbons’ adsorption efficiency. Regardless of the material used, experimental confirmation of the reduction-complexation Cr(VI) adsorption mechanism at pH = 5.5 was made. Finally, the technical-economic parameter ϕ is introduced to facilitate a proposed activation method’s economic feasibility evaluation. Interestingly, raw and activated avocado seeds under some studied scenarios showed similar maximum adsorption uptake values but with different ϕ values of 1.55 and 27.2 g Cr(VI)/USD. Thus, although the processes obtain similar yields, there are dissimilar regarding their economic feasibility. |
| Databáze: | OpenAIRE |
| Externí odkaz: |
|
Full Text from ScienceDirect