Synthesis and characterisation of biocompatible metal-organic frameworks for water treatment and NOᵪ removal application /

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Student Theses

2025

Wu, Chen

Thesis

This folio is a collection of three separate research papers which includes three experiments studies and each contribution can also be read as a stand-alone article. The first article explores the development and application of alkaline earth metal-based metal-organic frameworks (MOFs) for the efficient removal and sensing of copper(II) ions from aqueous solutions. The unique structural properties of these MOFs, characterized by high porosity and tunable surface areas, facilitate enhanced adsorption capabilities for copper ions. The study investigates the synthesis of various MOFs and their performance in capturing copper(II) ions, demonstrating that specific structural modifications can significantly improve their efficacy. Additionally, the article examines the mechanisms underlying the adsorption processes, emphasizing the role of coordination interactions. The results highlight the potential of alkaline earth metal-based MOFs as sustainable and effective materials for environmental remediation, offering promising avenues for future research in heavy metal ion removal and sensing applications. The second article investigates the efficient removal of the pharmaceutical compounds piroxicam and ketoprofen using acid-modulated iron(III) MOFs. The study focuses on the synthesis of these MOFs, which are engineered through the strategic addition of acidic components to enhance their structural properties and adsorption capabilities. The performance of the acid-modulated iron(III) MOFs is thoroughly evaluated in terms of their ability to adsorb and eliminate the targeted drugs from aqueous solutions. Results demonstrate that the acid modification significantly improves the crystallinity and surface area of the MOFs, leading to enhanced adsorption performance. The adsorption mechanisms are also explored, providing insights into the interactions between the MOFs and the pharmaceutical compounds. This research highlights the potential of acid-modulated iron(III) MOFs as effective materials for the removal of contaminants from wastewater, contributing to the development of sustainable strategies for environmental protection. The third study explores the tuning of crystallinity in bismuth-based MOFs and their application in the removal of nitric oxide (NO) from gas streams. By systematically varying synthesis conditions, including temperature, reaction time, and ligand concentrations, we achieved bismuth MOFs with distinct crystallinities: amorphous, semi-crystalline, and well-crystallized structures. The impact of crystallinity on the adsorption performance for NO was rigorously evaluated, revealing that the amorphous structure demonstrated the highest efficiency in NO removal, followed by the semi-crystalline and well-crystallized variants. The enhanced performance of the amorphous MOF was attributed to its increased surface area and higher density of active sites, facilitating more effective gas adsorption. This research underscores the significance of crystallinity in optimizing the functionality of bismuth-based MOFs and highlights their potential as advanced materials for environmental remediation, specifically in addressing air pollution caused by nitrogen oxides

LG51.H43 Dr 2025eb Wuc

https://educoll.lib.eduhk.hk/records/G44ZpQty