Master Degree / Yüksek Lisans Tezleri
Permanent URI for this collectionhttps://hdl.handle.net/11147/3008
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Master Thesis Synthesis of Natural Adsorbents From Lignocellulosic Biomass for the Recovery of Boron From Water Resources(01. Izmir Institute of Technology, 2023) Altınbaş, Bekir Fırat; Yüksel Özşen, AslıThis work investigated the valorization of olive tree pruning waste as a biosorbent for the removal of environmentally hazardous boron from aqueous solution using batch adsorption. For this purpose, a novel, waste-based, boron-selective biosorbent from pristine cellulose and olive tree pruning waste (N-OPW) was synthesized. After confirming the proposed synthesis route with pristine cellulose, an alkali pretreatment, followed by glycidyl-methacrylate (GMA) grafting and providing boron selectivity with n-methyl-d-glucamine (NMDG) steps were applied to the biomass, respectively. N-OPW was characterized using SEM, TGA and FT-IR analyses. N-OPW showed excellent boron biosorption capacity (21.80 mg/g) in an operation pH range between 2-12. The equilibrium was attained in two hours and the Freundlich isotherm (R2=0.997) and pseudo-second-order kinetics (R2=0.99) provided the strongest match to experimental data. According to thermodynamic studies, boron adsorption was exothermic (ΔH°= - 34.14 kJ/mol). The reusability tests with real geothermal water showed that adsorbent had no significant decrease in boron removal capacity while desorbing >99% of the boron adsorbed for three cycles of adsorption/desorption. Results indicated that a promising, reusable, and boron-selective biosorbent was successfully synthesized while utilizing olive pruning waste.Master Thesis The Development of Zinc Borate Production Process(Izmir Institute of Technology, 2004) Eltepe, Hüdal Emre; Balköse, Devrim; Balköse, DevrimThe main objective of this study is the production of zinc borate which is used in large quantities as flame retardent and smoke subpressent material by making use of ourcountry.s resources which is the largest boron reserves in the world. The development of commercially acceptable zinc borate production process was investigated from several different views and the samples obtained were characterized by using different techniques. The physico-chemical properties of each sample were characterized by X-Ray diffraction, Fourier Transform Infrared Spectroscopy (FTIR), Scanning Electron Microscopy (SEM), Energy Dispersive X-ray (EDX) analysis, thermal gravimetric analysis (TGA). Several forms of zinc borate with various dehydration temperatures are possible to obtain.A popular form of zinc borate which dehydrates above 290 C was obtained in this study.