Chitin hydrogel reinforced with TiO 2 nanoparticles as an arsenic sorbent
| Autor: | Sabrina G. Albornoz, Sergio A. Giorgieri, María Luz Peralta Ramos, Claudio Javier Pérez, María Emilia Villanueva, Joaquín Antonio González, Guillermo Javier Copello |
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| Rok vydání: | 2016 |
| Předmět: |
Sorbent
Chemistry General Chemical Engineering Langmuir adsorption model Infrared spectroscopy Sorption 02 engineering and technology General Chemistry 010402 general chemistry 021001 nanoscience & nanotechnology 01 natural sciences Industrial and Manufacturing Engineering 0104 chemical sciences symbols.namesake Adsorption Chemical engineering Self-healing hydrogels symbols Environmental Chemistry Organic chemistry Point of zero charge Fourier transform infrared spectroscopy 0210 nano-technology |
| Zdroj: | Chemical Engineering Journal. 285:581-587 |
| ISSN: | 1385-8947 |
| DOI: | 10.1016/j.cej.2015.10.035 |
| Popis: | In this work chitin hydrogels were reinforced with TiO 2 nanoparticles acting as fillers. The mechanical and physicochemical characteristics of these hydrogels were studied by oscillatory rheology, infrared spectroscopy (FTIR), Scanning Electron Microscopy (SEM) and Small Angle X-ray Spectroscopy (SAXS). Adsorption showed to be higher at pHs below the TiO 2 point of zero charge (pH ≈ 6.9). The equilibrium was achieved within 4 h following an Elovich kinetic model. The equilibrium assay showed a maximum capacity of 3.1 mg/g with better fitting for the Langmuir model. Moreover, the homogeneity/heterogeneity parameters of the Sips, Toth and Redlich–Peterson models were close to a value of 1, indicating a homogeneous sorbent/sorbate interaction. Typical natural water ions competed with As(V) for the sorption sites, being sulfate the most relevant interference. This interference was also evidenced in As(V) adsorption from natural water samples where the sorption capacity varied depending the anion composition of the sample. The reutilization of the hybrid gel was assessed up to five adsorption cycles. |
| Databáze: | OpenAIRE |
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