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Vol. 32 No. 7 (2020): Vol 32 Issue 7

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Efficient Removal of Cationic and Anionic Dyes from Aqueous Solutions using Regenerated Silk Fibroin Beads

Walaikorn Nitayaphat
Department of Home Economics, Faculty of Science, Srinakharinwirot University, Bangkok, Thailand
Thanut Jintakosol
Gems and Jewelry Program, College of Creative Industry, Srinakharinwirot University, Bangkok, Thailand

Corresponding Author(s) : Walaikorn Nitayaphat

walaikorn@g.swu.ac.th

Asian Journal of Chemistry, Vol. 32 No. 7 (2020): Vol 32 Issue 7

Abstract

Regenerated silk fibroin beads (rSFB) were successfully prepared and applied to adsorbing methylene blue and Lanasyn Navy M-DNL. The effects of contact time, initial pH and initial concentration of dyes were analyzed. The experimental results showed that, the adsorption was pH dependent with a high removal efficiency of methylene blue in basic range and high removal of Lanasyn Navy M-DNL in acidic range. The adsorption process was analyzed by using Langmuir and Freundlich isotherm models and the Langmuir isotherm model showed the best fitting to the isotherm data. The maximum adsorption capacities for methylene blue and Lanasyn Navy M-DNL were 47.55 and 78.74 μmg/g, respectively. The kinetics study showed that the adsorption process followed the second order kinetic model. The SEM images demonstrated that after adsorption the dye was adsorbed onto the regenerated silk fibroin beads surface. The adsorbent was stable and active for up to five successive cycles. Regenerated silk fibroin beads showed to be an advantageous adsorbents in terms of availability, which is beneficial for the wastewater treatment.

Keywords

Adsorption Silk fibroin Methylene blue Lanasyn Navy M-DNL Biosorbent
Nitayaphat, W., & Jintakosol, T. (2020). Efficient Removal of Cationic and Anionic Dyes from Aqueous Solutions using Regenerated Silk Fibroin Beads. Asian Journal of Chemistry, 32(7), 1623–1629. Retrieved from https://asianpubs.org/index.php/ajchem/article/view/2368
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