UiO-66 metal-organic frameworks for water treatment
department or school: Applied Science, Faculty of
department or school: Engineering, School of (Okanagan)
data provider: DSpace
degree campus: UBCO
creator: Ahmadijokani, Farhad
issued: 2023-12-18T18:52:34Z
issued: 2024
related degree: Doctor of Philosophy - PhD
degree grantor: University of British Columbia
description: Metal-organic frameworks (MOFs), specifically Zr-based UiO-66, have gained attention for removing toxic pollutants due to their unique attributes. These include a large surface area, high porosity, active adsorption sites, tunable chemistry, pore control, and robust host-guest interactions. However, the practical use of pure MOF powders in water treatment faces limitations such as insolubility, processability, brittleness, safety concerns, and separation challenges. One of the significant concerns when using MOFs for water treatment is how well they maintain stability when exposed to aqueous environments. Therefore, this thesis demonstrates the stability of UiO-66 MOF over one year in water and chloroform, with minor changes observed in structure when exposed to dimethylformamide (DMF). The results from the stability studies contribute to a better understanding of UiO-66's stability in aqueous media. UiO-66 exhibits effective removal of organic pollutants, including methyl red (MR), methyl orange (MO), malachite green (MG), and methylene blue (MB), which possess different charges. The stable UiO-66 polycrystalline MOFs still grapple with the challenge of effective separation from the treated water. This thesis pursued a magnetic approach for the magnetization of UiO-66, coupled with subsequent post-modification. This strategy aimed to facilitate the efficient separation of UiO-66 from treated water using an external magnet. A two-step post-modification procedure, utilizing 2,4,6-trichloro-1,3,5-triazine (TCT) and 5-phenyl-1H-tetrazole (PTZ) agents, was introduced to enhance the adsorption performance of the magnetic nanocomposite. Despite a reduction in porosity and specific surface area compared to the pristine UiO-66-NH2, the resulting magnetic post-modified UiO-66 exhibited significantly improved adsorption capacity. Notably, magnetic UiO-66-TCT demonstrated a high adsorption capacity of approximately 298 mg/g for methyl orange (MO), offering facile MOF separatio…
aggregated CHO: https://circle.library.ubc.ca/rest/handle/2429/86968
note: UiO-66 Metal-Organic Frameworks for Water Treatment by Farhad Ahmadijokani M.Sc., Sharif University of Technology, 2017 A THESIS SUBMITTED IN PARTIAL FULFILLMENT OF THE REQUIREMENTS FOR THE DEGREE OF DOCTOR OF PHILOSOPHY in THE COLLEGE OF GRADUATE STUDIES (Mechanical Engineering) THE UNIVERSITY OF BRITISH COLUMBIA (Okanagan) December 2023 © Farhad Ahmadijokani, 2023ii The following individuals certify that they have read, and recommend to the College of Graduate Studies for acceptance, a dissertation entitled: UiO-66 Metal-Organic Frameworks for Water Treatment submitted by Farhad Ahmadijokani in partial fulfillment of the requirements of the degree of Doctor of Philosophy Dr. Mohammad Arjmand, School of Engineering Supervisor Dr. Lukas Bichler, School of Engineering Supervisory Committee Member Dr. Jian Liu, School of Engineering Supervisory Committee Member Dr. Liwei Wang, School of Engineering University Examiner Dr. Sohrab Zendehboudi, Memorial University External Examiner iii Abstract Metal-organic frameworks (MOFs), specifically Zr-based UiO-66, have gained attention for removing toxic pollutants due to their unique attributes. These include a large surface area, high porosity, active adsorption sites, tunable chemistry, pore control, and robust host-guest interactions. However, the practical use of pure MOF powders in water treatment faces limitations such as insolubility, processability, brittleness, safety concerns, and separation challenges. One of the significant concerns when using MOFs for water treatment is how well they maintain stability when exposed to aqueous environments. Therefore, this thesis demonstrates the stability of UiO-66 MOF over one year in water and chloroform, with minor changes observed in structure when exposed to dimethylformamide (DMF). The results from the stability studies contribute to a better understanding of UiO-66's stability in aqueous media. UiO-66 exhibits effective removal of organic pollutants, including methyl red (MR…
has type: Thesis/Dissertation
date issued: 2024-02
is shown at: 10.14288/1.0438293
language: eng
degree discipline: Mechanical Engineering
provider: Vancouver : University of British Columbia Library
publisher: University of British Columbia
rights: Attribution-NonCommercial-NoDerivatives 4.0 International
rights URI: http://creativecommons.org/licenses/by-nc-nd/4.0/
scholar level: Graduate
contributor: Arjmand, Mohammad
type: Text
identifier URI: http://hdl.handle.net/2429/86968