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ADSORPTION OF REACTIVE AZO DYES ON CHITOSAN/OIL-PALM ASH COMPOSITE ADSORBENT: BATCH AND CONTINUOUS STUDIES MASITAH BINTI HASAN UNIVERSITI SAINS MALAYSIA 2008 ADSORPTION OF REACTIVE AZO DYES ON CHITOSAN/OIL-PALM ASH COMPOSITE ADSORBENT: BATCH AND CONTINUOUS STUDIES by MASITAH
| Content Provider | Semantic Scholar |
|---|---|
| Author | Hasan, Binti |
| Copyright Year | 2009 |
| Abstract | The adsorption of reactive blue 19 (RB19), reactive orange 16 (RO16) and reactive black 5 (RB5) on cross-linked chitosan/oil palm ash composite beads was studied in batch and column modes of operation. Batch adsorption studies were carried out for adsorption of reactive dyes onto cross-linked chitosan/ oil palm ash composite beads. Various experimental parameters were studied including initial dye concentration (50 500 mg/L), contact time, pH of solution (2 13) and temperature (30 50 C). The experimental data were analyzed using Langmuir, Freundlich, Temkin and Dubinin-Raduskevich isotherm model. The adsorption of RB19 and RO16 was found to follow Freundlich model, while RB5, showed a better fit to the Langmuir and Freundlich isotherm model. Pseudo-first-order, pseudo-second-order kinetic model and intraparticle diffusion model were used to analyze the kinetic data. It was found that the data follow the pseudo-first-order kinetic model at lower concentration, while at higher concentrations, it followed pseudo-second-order kinetic model for RB19 for all temperature studied. Contrary, RO16 and RB5 dye followed pseudo-first-order kinetic model for whole initial concentration and temperature studied. However, based on the standard normalized deviation, the pseudo-second-order kinetic model fitted well for whole system of dyes studied. Various thermodynamic parameters, such as Gibbs energy (∆G), entalphy change (∆H) and entrophy change (∆S), were calculated, which indicated that the present system was spontaneous and endothermic process for RB19 and RO16. However, exothermic process of adsorption of RB5 was observed. The cross-linked chitosan/oil palm ash composite beads were characterized by Scanning Electron microscopy (SEM) and Fourier Transform Infrared (FT-IR) Spectroscopy. Evidence from FT-IR spectra showed the participation of amine groups in the adsorption of RB19, RO16 and RB5 dyes and the mechanism was proposed to be electrostatic interaction between the positive charge amine groups and negative |
| File Format | PDF HTM / HTML |
| Alternate Webpage(s) | http://eprints.usm.my/8999/1/ADSORPTION__OF_REACTIVE_AZO_DYES_ON_CHITOSAN_OIL_PALM_ASH.pdf |
| Language | English |
| Access Restriction | Open |
| Content Type | Text |
| Resource Type | Article |
