L-Ascorbic Acid-g-Polyaniline Mesoporous Silica Nanocomposite for Efficient Removal of Crystal Violet: A Batch and Fixed Bed Breakthrough Studies
| Autor: | Rais Ahmad Khan, Ali Alsalme, Ibtisam I. BinSharfan, Imran Hasan |
|---|---|
| Jazyk: | angličtina |
| Rok vydání: | 2020 |
| Předmět: |
Materials science
General Chemical Engineering Box–Behnken design Langmuir adsorption model mass transfer coefficient Mesoporous silica fixed bed adsorption Ascorbic acid Article lcsh:Chemistry chemistry.chemical_compound symbols.namesake Reaction rate constant Adsorption chemistry lcsh:QD1-999 Mass transfer Polyaniline symbols mesoporous silica NPs Thomas model General Materials Science Crystal violet Nuclear chemistry |
| Zdroj: | Nanomaterials, Vol 10, Iss 2402, p 2402 (2020) Nanomaterials Volume 10 Issue 12 |
| ISSN: | 2079-4991 |
| Popis: | In the present study, mesoporous silica nanoparticles (MSNs) synthesized through sol&ndash gel process and calcined at 600 ° C were further surface functionalized by a copolymer chain of L-ascorbic acid (AS) and polyaniline (PAni) by in situ free radical oxidative polymerization reaction. The surface modification of MSNs by AS-g-PAni was confirmed by using various analytical techniques, namely FTIR, XRD, SEM&ndash EDX, TEM and AFM. The composition of AS-g-PAni@MS was found to be composed of C (52.53%), N (20.30%), O (25.69%) and Si (1.49%), with 26.42 nm as the particle size. Further, it was applied for the adsorption of crystal violet (CV) dye under batch, as well as fixed bed method. RSM&ndash BBD was taken into consideration, to optimize the various operational parameters effecting the adsorption through batch method. To explore maximum efficiency of the material, it was further subjected to adsorption of CV under fixed bed method, using the variable bed heights of 3.7, 5.4 and 8.1 cm. Based on high value of regression coefficient (R2) and low value of RMSE given as (0.99, 0.02) for 3.7 cm, (0.99, 0.03), the breakthrough data were very well defined by the Thomas model, with optimum concurrence of stoichiometric adsorption capacity values. The external mass transfer equilibrium data were well fitted by the Langmuir model, with maximum monolayer adsorption capacity of 88.42 mg g&minus 1 at 303K, 92.51 mg g&minus 1 at 313 K, 107.41 mg g&minus 1 at 313 K and 113.25 mg g&minus 1 at 333 K. The uptake of CV by AS-g-PAni@MS was well defined by pseudo second order model with rate constant K2 = 0.003 L mg&ndash 1 min&ndash 1 for 50 and 0.003 L mg&ndash 1 for 60 mg L&ndash 1 CV. The adsorption reaction was endothermic with enthalpy (&Delta H) value of 3.62 KJ mol&minus 1 and highly efficient for treatment of CV-contaminated water for more the five consecutive cycles. |
| Databáze: | OpenAIRE |
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