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Removal of Heavy Methal Ions from Wastwater Via Novel Nanocomposite of Biochar/Tio2

Anoosha, Ebrahim | 2018

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  1. Type of Document: M.Sc. Thesis
  2. Language: Farsi
  3. Document No: 52056 (06)
  4. University: Sharif University of Technology
  5. Department: Chemical and Petroleum Engineering
  6. Advisor(s): Farhadi, Fathollah
  7. Abstract:
  8. To investigate the metallic cation (Ni and Pb) removal performance of the rice barn-obtained biochar which was modified by nitric acid and titanium nanoparticles (TiO2) adsorption tests were conducted in continuous and non-continuous systems. First section addressed the characterization of the synthesized sorbents using field emission scanning electron microscope (FESEM), Fourier transform infrared spectroscopy (FT-IR), X-ray diffraction (XRD), energy dispersive X ray spectroscopy (EDX) and sorption-desorption porosity analysis (BET). In the second section, the effect of different parameters such as pH, initial concentration of the metallic ions, temperature, time, sorbent content, ionic strength and UV radiation during the pollutant removal process was investigated. The process kinetics was examined using pseudo-first and pseudo-second order models; while the process isotherm was assessed by empirical models of Langmuir- Freundlich. Thermodynamic of the process was evaluated by Van’t Hoff model and finally the simultaneous impact of pH, initial metallic ion concentration and temperature was studied using response surface method (RSM). For both metallic pollutants, the results indicated that the initial concentration was more effective and sensitive parameter compared to pH and temperature. Kinetic analysis and adsorption isotherm of the equilibrated data showed more accurate fitting of the data with pseudo-second order kinetic model and Freundlich isotherm model. Moreover, the optimal operational condition was C= 400 mg/L, pH=6.44 and T=40 ℃ for Pb and C=400 mg/L, pH=6.44 and T=40 ℃ for Ni. Under the optimal condition, the adsorption capacity for Pb and Ni were calculated as 177.54 and 94.18 mg/g, respectively. These values showed 0.9% and 3.7% difference with the RSM-estimated values for Pb and Ni, respectively. Thermodynamic investigation of the process showed that the Ni and Pb adsorption has an exothermic and spontaneous nature. In the third section, the performance of the sorbent was investigated in a continuous system to examine the effect of various parameters such as initial concentration of Pb ion in the effluent, initial pH and the adsorption substrate height. The results were also simulated by Thomas model. The results show that a good match between experimental data and model
  9. Keywords:
  10. Waste Treatment ; Adsorption ; Rice Husk ; Response Surface Method ; Heavy Metals Removal

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