A comparative study on sorption of arsenate ions from water by crosslinked chitosan and crosslinked chitosan/MMT nanocomposite
| Autor: | Bodhaditya Das, Tarun K. Maji, Rashmi R. Devi, Ashim Jyoti Thakur, Pankaj Gogoi |
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| Rok vydání: | 2016 |
| Předmět: |
Langmuir
Nanocomposite Chemistry Process Chemistry and Technology Arsenate Sorption 02 engineering and technology 010501 environmental sciences 021001 nanoscience & nanotechnology 01 natural sciences Pollution Chitosan chemistry.chemical_compound Montmorillonite Polymer chemistry Chemical Engineering (miscellaneous) Freundlich equation Glutaraldehyde 0210 nano-technology Waste Management and Disposal 0105 earth and related environmental sciences Nuclear chemistry |
| Zdroj: | Journal of Environmental Chemical Engineering. 4:4248-4257 |
| ISSN: | 2213-3437 |
| Popis: | Montmorillonite (MMT) clay incorporated chitosan (CT) nanocomposite was prepared by simplified ionic gelation method. Different characterization techniques were performed to investigate the binding and structural properties of prepared materials. It was found that incorporation of clay into chitosan followed by crosslinking with glutaraldehyde (GLU) enhances the arsenate sorption rate and better stability was observed on cyclic run compared to glutaraldehyde crosslinked chitosan (Ct/Glu). The sorption process attained equilibrium within 90 min of treatment time and a dose of 2 g/L of crosslinked chitosan/MMT (MMT/Ct/Glu) was sufficient to bring down the arsenate concentration below 0.01 mg/L. Increase in initial ion concentration of arsenate ions decreases the sorption rate, but the ion uptake capacity increases. The sorption was reasonably explained with Langmuir (R L ∼ 0.995 & 0.996 for MMT/Ct/Glu & Ct/Glu) and Freundlich isotherms (n ∼ 2.75 & 3.12 for MMT/Ct/Glu & Ct/Glu). The R 2 values indicated a monolayer type of chemisorption pattern. The sorption process was found to be governed by pseudo second order kinetics. |
| Databáze: | OpenAIRE |
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