Interface interactions between insecticide carbofuran and tea waste biochars produced at different pyrolysis temperatures
| Autor: | A. K. Karunarathna, Dinesh Mohan, Yong Sik Ok, Meththika Vithanage, S. S. Mayakaduwa |
|---|---|
| Jazyk: | angličtina |
| Rok vydání: | 2016 |
| Předmět: |
Health
Toxicology and Mutagenesis 02 engineering and technology 010501 environmental sciences chemisorption Toxicology black carbon 01 natural sciences chemistry.chemical_compound Adsorption lcsh:Environmental pollution Isotherm modeling pesticide lcsh:Environmental sciences 0105 earth and related environmental sciences lcsh:GE1-350 Chemical Health and Safety Chemistry Carbon black Pesticide Contamination 021001 nanoscience & nanotechnology slow pyrolysis Chemisorption Environmental chemistry lcsh:TD172-193.5 0210 nano-technology Pyrolysis Carbofuran |
| Zdroj: | Chemical Speciation & Bioavailability, Vol 28, Iss 1-4, Pp 110-118 (2016) |
| ISSN: | 2047-6523 0954-2299 |
| Popis: | Biochars showed a potential as adsorbents for organic contaminants, however, have not been tested for carbofuran, which has been detected frequently in water. This study provides evidences for the use of infused tea residue derived biochar for carbofuran removal. Biochars were produced at 300, 500 and 700 °C by slow pyrolysis and were characterized by proximate and ultimate analysis, FT-IR, SEM, BET and pore size distribution. Pyrolysis temperature showed a pronounced effect on biochar properties. The maximum carbofuran removal was achieved at pH 5. Freundlich and Temkin models best fit the equilibrium data. Biochars produced at 700 °C showed the highest sorption intensity. The adsorption process was likely to be a favorable chemisorption process with electrostatic interactions between carbofuran molecules and biochar surface. Acid-base interactions, electrophilic addition reactions and amide bond formations are the possible mechanisms of carbofuran adsorption. Overall, biochars prepared from tea waste can be utilized as effective adsorbents for removal of aqueous carbofuran. |
| Databáze: | OpenAIRE |
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