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Adsorption of Heavy Metals and Various Pollution from Aqueous Solutions by Vegetable Residues

Mohebali, Sanaz | 2018

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  1. Type of Document: M.Sc. Thesis
  2. Language: Farsi
  3. Document No: 50646 (06)
  4. University: Sharif University of Technology
  5. Department: Chemical and Petroleum Engineering
  6. Advisor(s): Bastani, Dariush; Seif-Kordi, Ali Akbar
  7. Abstract:
  8. Celery residue modified with H2SO4 was utilized as a low-cost adsorbent for removal of hazardous dyes (methylene blue, malachite green and congo red) and heavy metals (Pb(II) and Cd(II)) from aqueous solution in batch adsorption process. Also, celery residue modified with cationic surfactant (CTAB) to enhance the removal of congo red (anionic dye). The treated and untreated adsorbent was characterized by Fourier transform infrared (FTIR) spectroscopy and Scanning Electron Microscopy (SEM). The efficacy of dye removal of the modified celery residue was investigated by varying adsorbent dose, contact time, pH, initial dye concentration, and temperature. Experimental data were fitted by three different isotherm models including Langmuir, Freundlich and Temkin. The maximum monolayer adsorption capacity of adsorbent found out to be 476.19, 526.32, 238.095, 217.39 and 196.08 mg/g at 303 K for adsorption of MB, MG, CR, Cd(II) and Pb(II) respectively onto modified celery residue and 526.32 mg/g for adsorption of CR onto CTAB-modified celery residue. Three adsorption kinetic models including pseudo-first order, pseudo-second order and intra-particle diffusion were used to analyse experimental data. Also, thermodynamic studies were carried out and the values of ΔH˚, ΔS˚ and ΔG have been determined. Regeneration of adsorbent was evaluated for MB and MG and excellent results were obtained. In order to investigate this process from industrial point of view, adsorption process also carried out in column mode. Thomas, Yoon-Nelson and response dose models were applied to describe the results of column mode experiments. The results of this study indicate that modified celery residue is an effective low-cost adsorbent for removal of dyes and heavy metals from aqueous solutions
  9. Keywords:
  10. Adsorption ; Dye ; Heavy Metals ; Surface Modification ; Agricultural Wastes

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