Polyvinyl Alcohol/Calcium Carbonate Nanocomposites as Efficient and Cost-Effective Cationic Dye Adsorbents
| Autor: | Jaber Ghourbanpour, Davoud Jahani, Amin Nazari, Amir Ameli |
|---|---|
| Rok vydání: | 2020 |
| Předmět: |
Langmuir
Nanocomposite Materials science Polymers and Plastics nanocomposite isotherm Cationic polymerization General Chemistry Polyvinyl alcohol Article dye removal Solvent lcsh:QD241-441 chemistry.chemical_compound Adsorption chemistry Chemical engineering lcsh:Organic chemistry adsorption kinetics Safranin Freundlich equation calcium carbonate |
| Zdroj: | Polymers Polymers, Vol 12, Iss 2179, p 2179 (2020) Volume 12 Issue 10 |
| ISSN: | 2073-4360 |
| Popis: | A novel polyvinyl alcohol (PVA)/calcium carbonate-based double-layer cationic dye adsorbent was developed. Polyvinyl alcohol (50 wt %) and calcium carbonate (50 wt %) were used together with borax as a cross-linking agent. The nanocomposite was prepared using only water, without the need for any toxic solvent or hazardous chemical. The final samples were obtained by the solvent casting method. The nanocomposite adsorbent was characterized using a Fourier transform infrared (FTIR) spectroscope and a scanning electron microscope (SEM). The adsorption performance on two cationic dyes, i.e., methylene blue and safranin was studied. Dye adsorption was quantified by measuring the nanocomposite swelling, contact time, and dye concentration. Pseudo first-order and pseudo second-order kinetic models as well as intraparticle diffusion model were used to model the adsorption kinetics. Moreover, the isotherm dye adsorption was investigated by Langmuir and Freundlich models. The results revealed that the developed nanocomposite has relatively high adsorption efficiency and short adsorption time and retains its performance after several successive absorption&ndash desorption processes. The results also showed that the pseudo-second-order model best describes the adsorption kinetics, and the Freundlich isotherm model has a better compatibility with the experimental data. Finally, an adsorption mechanism was proposed for the dye removal process. The developed PVA/CaCO3 nanocomposite can be potentially used for efficient dye removal in wastewater treatments. |
| Databáze: | OpenAIRE |
| Externí odkaz: |
|