Highly efficient porous carbons for the removal of W(VI) oxyanion from wastewaters
| Autor: | Filomena Pinto, Nuno Lapa, Paulo do Carmo de Sá Caetano, Davide Don, Isabel Fonseca, Jakpar Jandosov, Maria Bernardo, Diogo Dias, Svitlana B. Lyubchyk, André Sanches |
|---|---|
| Rok vydání: | 2021 |
| Předmět: |
Environmental Engineering
Health Toxicology and Mutagenesis 0211 other engineering and technologies Oxyanion Wastewater treatment 02 engineering and technology 010501 environmental sciences 01 natural sciences Tungsten chemistry.chemical_compound Adsorption medicine Environmental Chemistry Waste Management and Disposal Effluent Activated carbons 0105 earth and related environmental sciences 021110 strategic defence & security studies Pollution 6. Clean water chemistry Volume (thermodynamics) Wastewater Mesoporous material Pyrolysis Rice wastes Activated carbon medicine.drug Nuclear chemistry |
| Zdroj: | Repositório Científico de Acesso Aberto de Portugal Repositório Científico de Acesso Aberto de Portugal (RCAAP) instacron:RCAAP |
| ISSN: | 0304-3894 |
| DOI: | 10.1016/j.jhazmat.2021.125201 |
| Popis: | Pyrolysis chars derived from rice wastes were chemically activated and used in W(VI) oxyanion adsorption assays in synthetic and mining wastewaters. For comparison purposes, a commercial activated carbon (CAC) was also used. Different experimental conditions were tested in the adsorption assays: solid/liquid ratio (S/L), initial pH, contact time, and initial W concentration. The porous carbon P2C+KOH presented the overall best performance in both media, due to its high surface area (2610 m2 g-1), mesopore volume (1.14 cm3 g-1), and neutral pHpzc (6.92). In the synthetic wastewater, the highest uptake capacity of P2C+KOH (854 mg g-1) was found in the assays with an S/L 0.1 g L-1, an initial pH 2, and an initial W concentration of 150 mg L-1, for 24 h. This value was almost 8 times higher than the one obtained for CAC (113 mg g-1). In the mining wastewater, P2C+KOH showed an even higher uptake capacity (1561 mg g-1) in the assay with the same experimental conditions, which was almost 3 times higher than for CAC (561 mg g-1). These results suggest that P2C+KOH seems to be an efficient alternative to CAC in the W(VI) adsorption from liquid effluents. info:eu-repo/semantics/publishedVersion |
| Databáze: | OpenAIRE |
| Externí odkaz: |
|
Full Text from ScienceDirect