Wheat Straw as a Bio-Sorbent for Arsenate, Chromate, Fluoride, and Nickel
| Autor: | Aurora Romar-Gasalla, Manuel Arias-Estévez, Juan Carlos Nóvoa-Muñoz, Avelino Núñez-Delgado, Esperanza Álvarez-Rodríguez, María J. Fernández-Sanjurjo, Gustavo Ferreira Coelho |
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| Přispěvatelé: | Universidade de Santiago de Compostela. Departamento de Edafoloxía e Química Agrícola |
| Jazyk: | angličtina |
| Rok vydání: | 2017 |
| Předmět: |
Niquel
lcsh:Hydraulic engineering Cr(VI) Geography Planning and Development straw Trigo 02 engineering and technology 010501 environmental sciences Aquatic Science Suelo 01 natural sciences Biochemistry Investigación::25 Ciencias de la tierra y del espacio::2511 Ciencias del suelo (Edafología)::251104 Química de suelos [Materias] F− chemistry.chemical_compound Soil Adsorption lcsh:Water supply for domestic and industrial purposes retention/release Nickel lcsh:TC1-978 Desorption Point of zero charge Fluoride 0105 earth and related environmental sciences Water Science and Technology lcsh:TD201-500 Waste management Chromate conversion coating Chemistry Paja Arsenate Sorption Wheat straw Cromo Ni2+ Straw 021001 nanoscience & nanotechnology Chromate Fluor Heavy metals As(V) Arsenio 0210 nano-technology Metales pesados Nuclear chemistry |
| Zdroj: | Water, Vol 9, Iss 9, p 690 (2017) Minerva. Repositorio Institucional de la Universidad de Santiago de Compostela instname |
| ISSN: | 2073-4441 |
| Popis: | Batch-type experiments were used to study As(V), Cr(VI), F−, and Ni2+ sorption/desorption on wheat straw. For the lowest concentration added (0.5 mmol·L−1), the sorption sequence was F− > Ni2+ > Cr(VI) >> As(V) (93%, 61%, 29%, 0.3%), but changed to Ni2+ > F− > Cr(VI) >> As(V) when 3.0 and 6.0 mmol·L−1 were added (with 65%, 54%, 25%, 0%, and 68%, 52%, 27%, 0% sorption, respectively). Overall, As(V) showed the lowest sorption, whereas it was 25–37% for Cr(VI), 61–68% for Ni2+, and 52–93% for F−. For As(V), pH in the equilibrium solution was always above the pH of the point of zero charge (pHPZC) for wheat straw, decreasing sorption efficiency. For Cr(VI), pH was below pHPZC, but not enough to reach high sorption. For F−, pH in the equilibrium was above pHPZC, which could reduce sorption. For Ni2+, pH in the equilibrium was always below pHPZC, which made sorption difficult. The satisfactory fitting of Cr(VI), F−, and Ni2+ data to the Freundlich model suggests multilayer-type adsorption. Desorption was high for F−, whereas Ni2+ showed the lowest desorption. This research could be especially relevant when focusing on the use of wheat straw as a bio-sorbent, and in cases where straw mulching is used Funds received to perform this study: grant numbers CGL2012-36805-C02-01 and CGL2012-36805-C02-02 (Ministerio de Economía y Competitividad, Government of Spain). The European Regional Development Fund (ERDF) partially financed it SI |
| Databáze: | OpenAIRE |
| Externí odkaz: |
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