Adsorptive Removal of Anionic Azo Dye New Coccine Using Silica and Silica-gel with Surface Modification by Polycation
| Autor: | Tien Duc Pham, Viet Phuong Bui, Thuy Nga Pham, Thi Mai Dung Le, Kim Thuy Nguyen, Van Hoi Bui, The Dung Nguyen |
|---|---|
| Jazyk: | angličtina |
| Rok vydání: | 2021 |
| Předmět: |
Langmuir
Polymers and Plastics Silica gel Organic chemistry General Chemistry Chloride PDADMAC Article silica-gel chemistry.chemical_compound Adsorption QD241-441 chemistry Ionic strength adsorption silica new coccine medicine Surface modification Freundlich equation Fourier transform infrared spectroscopy Nuclear chemistry medicine.drug |
| Zdroj: | Polymers, Vol 13, Iss 1536, p 1536 (2021) Polymers Volume 13 Issue 10 |
| ISSN: | 2073-4360 |
| Popis: | In the present work, adsorption of anionic azo dye, new coccine (NCC) on silica and silica-gel in an aquatic environment was discovered. Effective conditions such as adsorption time, pH, the influence of dosage on NCC adsorption using strong polycation, poly-diallyl-dimethylammonium chloride (PDADMAC) modified silica (PMS) and PDADMAC modified silica-gel (PMSG) were systematically studied. The removal of NCC using PMS and PMSG were much higher than that using raw silica and silica-gel without PDADMAC in all pH ranges from 3 to 10. The adsorption of NCC onto PMS and PMSG was achieved maxima at the same conditions of contact time 30 min, pH 6. The optimum adsorbent dosages of PMS and PMSG for NCC removal were 10 and 20 mg·mL−1, respectively. Experimental results of NCC adsorption isotherms onto PMS and PMSG at different ionic strength were fitted by Langmuir and Freundlich models. The NCC removal efficiencies using PMS and PMSG were higher than 87%, indicating that PMS and PMSG are novel and reusable adsorbents for removal of anionic dye. Based on adsorption isotherms, and surface group changes after PDADMAC modification and NCC adsorption examined by Fourier transform infrared spectroscopy (FTIR), we demonstrate that electrostatic interaction between positively charged adsorbents’ surfaces and negative sulfonic groups of NCC are the main driving force for anionic azo dye adsorption onto PMS and PMGS adsorbents. |
| Databáze: | OpenAIRE |
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