Insights into aqueous carbofuran removal by modified and non-modified rice husk biochars
| Autor: | Dinesh Mohan, Meththika Vithanage, Indika Herath, S. S. Mayakaduwa, Yong Sik Ok |
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| Rok vydání: | 2015 |
| Předmět: |
Langmuir
Sorbent Health Toxicology and Mutagenesis 0211 other engineering and technologies 02 engineering and technology 010501 environmental sciences 01 natural sciences Husk Water Purification chemistry.chemical_compound Carbofuran Adsorption Biochar medicine Environmental Chemistry 0105 earth and related environmental sciences 021110 strategic defence & security studies Environmental engineering food and beverages Oryza General Medicine Pollution Kinetics chemistry Chemical engineering Charcoal Pyrolysis Water Pollutants Chemical Activated carbon medicine.drug |
| Zdroj: | Environmental science and pollution research international. 24(29) |
| ISSN: | 1614-7499 |
| Popis: | Biochar has been considered as a potential sorbent for removal of frequently detected pesticides in water. In the present study, modified and non-modified rice husk biochars were used for aqueous carbofuran removal. Rice husk biochars were produced at 300, 500, and 700 °C in slow pyrolysis and further exposed to steam activation. Biochars were physicochemically characterized using proximate, ultimate, FTIR methods and used to examine equilibrium and dynamic adsorption of carbofuran. Increasing pyrolysis temperature led to a decrease of biochar yield and increase of porosity, surface area, and adsorption capacities which were further enhanced by steam activation. Carbofuran adsorption was pH-dependant, and the maximum (161 mg g−1) occurred in the vicinity of pH 5, on steam-activated biochar produced at 700 °C. Freundlich model best fitted the sorption equilibrium data. Both chemisorption and physisorption interactions on heterogeneous adsorbent surface may involve in carbofuran adsorption. Langmuir kinetics could be applied to describe carbofuran adsorption in a fixed bed. A higher carbofuran volume was treated in a column bed by a steam-activated biochar versus non-activated biochars. Overall, steam-activated rice husk biochar can be highlighted as a promising low-cost sustainable material for aqueous carbofuran removal. |
| Databáze: | OpenAIRE |
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