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Photocatalytic Dyes Degradation in Wastewater Using Carbon Nanotube Based Composite Catalyst

Shokrgozar, Atefeh | 2018

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  1. Type of Document: M.Sc. Thesis
  2. Language: Farsi
  3. Document No: 50708 (06)
  4. University: Sharif University of Technology
  5. Department: Chemical and Petroleum Engineering
  6. Advisor(s): Khorashe, Farhad; Baghalha, Morteza; Niyaz Mahmoodi, Mohammad
  7. Abstract:
  8. Increased photo catalytic activity of NiO and 〖Co〗_3 O_4 were obtained by Ni〖Co〗_2 O_4 synthesizing and supporting functionalized multiwall carbon nano-tubes via calcinations followed by hydrothermal precipitation. NiO, 〖Co〗_3 O_4 and Ni〖Co〗_2 O_4 were prepared in the same procedure exactly for the subsequent photo catalytic activity to be compared to Ni〖Co〗_2 O_4/MWCNT later on. The photo catalytic degradation of Reactive Red 120 dye as a deazo organic pollutant model was used for experimental photo catalytic performance analysis. The CCD method was applied for experimental designing, modeling, and optimizing the operational parameters of the photo catalytic degradation of RR120 using Ni〖Co〗_2 O_4/MWCNT nano-composite. The catalyst dosage, initial dye concentration, and pH were defined as independent variables while dye removal percentage and TOC reduction percentage were chosen as response functions. The optimal values of the parameters were found to be catalyst dosage of 0.01g, pH of 3 and an initial dye concentration of 20 ppm that resulted in 88.9% removed dye and 48.7% reduced TOC. The kinetic investigation showed that the photo catalytic degradation of RR120 follows pseudo first order kinetics which resulted in apparent first order rate constant to be 0.01603 1⁄min .The effect of 0.01 M various mineral salts of NaCl, 〖Na〗_2 SO_4, NaNO_3 and NaCO_3 in photo catalytic degradation of RR120 on optimal conditions were investigated; the results showed the inhibition effect of 〖CO〗_3^- , 〖Cl〗^-, SO_4^(2-)from maximum inhibition to minimum in turn, but NO_3^- anions enhanced and accelerated the photo catalytic degradation of RR120 as the full purification was obtained just after 60min irradiation. The fabricated nano-particles were characterized by the SEM, EDS, XRD, UV–vis DRS analysis
  9. Keywords:
  10. Cobalt Oxide ; Photocatalytic Dye Degradation ; Nickle Oxide ; Carbon Nanotubes Nanocomposites ; Textile Effluent ; Waste Treatment ; Photocatalytic Purification ; Reactive Red 120 Dyes

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