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- Type of Document: M.Sc. Thesis
- Language: Farsi
- Document No: 47474 (03)
- University: Sharif University of Technology
- Department: Chemistry
- Advisor(s): Hormozi-Nezhad, Mohammad Reza; Alamolhoda, Ali Asghar
- Abstract:
- The growing use of nanomaterials leads to causing harm to the aquatic environment resulting in a demand for effective methods to remove these nanomaterials from aquatic environment. On the other hand, the high cost of raw materials used for the production of noble metal nanomaterial limits their use or requires the development of recycling and recovery methods. In this study, we found that citrate capped gold nanoparticles (cit-AuNPs) could be removed effectively from waste water using aluminum chloride (AlCl3) coagulant. The effect of pH, of coagulant concentration, and alkalinity on the performance of this coagulant was investigated. It has been shown that the removal efficiency of AuNPs is strongly pH-dependent. In addition at the condition of AlCl3 dosages of 100 mg/L, initial pH lower than 4 and sodium hydrogen carbonate concentration higher than 5mM settle able AuNPs flocs larger than 1mm were formed, and removal efficiencies above 92% were achieved. After the precipitation of AuNPs conventional reduction and precipitation approaches were used for the recovery of metallic gold and hydrogen tetra chloroaurate. The recycled hydrogen tetra chloroaurate can then be used to produce metallic gold and the primary AuNPs, as well
- Keywords:
- Gold Nanoparticle ; Elimination ; Flocculant ; Recovery ; Metallic Gold
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