Adsorption of cationic dye from aqueous solutions by date pits: Equilibrium, kinetic, thermodynamic studies, and batch adsorber design
| Autor: | Nabil M. Abdelmonem, N. M. Aboeleneen, R. A. Mansour |
|---|---|
| Rok vydání: | 2018 |
| Předmět: |
02 engineering and technology
Plant Science 010501 environmental sciences Kinetic energy 01 natural sciences chemistry.chemical_compound Adsorption Environmental Chemistry Coloring Agents 0105 earth and related environmental sciences Aqueous solution Chemistry Cationic polymerization Hydrogen-Ion Concentration 021001 nanoscience & nanotechnology Pollution Solutions Kinetics Biodegradation Environmental Chemical engineering Batch processing Thermodynamics Sorption isotherm 0210 nano-technology Methylene blue |
| Zdroj: | International journal of phytoremediation. 20(10) |
| ISSN: | 1549-7879 |
| Popis: | The retention profile of methylene blue from aqueous solutions onto the solid adsorbent date pits has been investigated in a batch system. The characterization and adsorption efficiency for methylene blue was evaluated using date pits. Fourier Transform Infra-Red, Scanning Electron Microscope, Brunauer-Emmett-Teller analysis were performed to determine the characteristics of the material. The effect of contact time, initial dye concentration, adsorbent dosage, temperature, and solution pH were investigated. The adsorption was found to increase with increasing time, decreasing concentration of dye, decreasing temperature and increasing dosage up to equilibrium values which was 20 min, 25°C, and 0.1 g adsorbent, respectively. The adsorption was favorable at high and low pH (pH 3, pH 7). The adsorption equilibrium data were best fitted by Freundlich isotherm. The adsorption kinetics was found to follow the pseudo second order kinetic model. Thermodynamic parameters such as free energy, enthalpy, and entropy were calculated and found to be -4.6 kJ/mole, -7.9 kJ/mole, and -11.8 kJ/mole, respectively. The thermodynamic parameters of the uptake of methylene blue onto the date pits indicated that, the process is exothermic and proceeds spontaneously at low temperature. A single stage batch adsorber was designed for adsorption of methylene blue by Date Pits based on optimum isotherm. |
| Databáze: | OpenAIRE |
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