Influence of synthesis parameters on the properties of MXenes: a comparative study of ammonium bifluoride and HCl-LiF etching methods for membrane reactor applications
Date
2024
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Publisher
University of Delaware
Abstract
MXenes, a class of two-dimensional materials derived from MAX phases, hold immense potential for applications in membrane technology due to their unique structural and functional properties. This thesis explores the synthesis of MXenes from Ti3AlC2 MAX phase using various etching methods, including NH4HF2, HCl-LiF, and sonication-assisted techniques. The study aims to optimize synthesis parameters to achieve high-quality MXenes with enhanced properties suitable for industrial applications. ☐ Detailed analysis reveals that NH4HF2-etched MXene exhibits a high BET surface area of 59.9860 m2/g, consistent pore sizes around 75 ˚A, and robust thermal stability up to 600°C. These properties make it particularly suitable for gas separation, desalination, and nanoparticle filtration. The presence of unique functional groups identified through FTIR contributes to its enhanced thermal stability and potential for further functionalization. Comparative analysis of HCl-LiF etched, mixed-phase, and degraded MXenes highlights significant variations in surface area, pore structure, and optical properties, underscoring the importance of optimal synthesis conditions. ☐ The findings establish a strong foundation for developing advanced MXene membranes, particularly NH4HF2-etched MXene, for use in membrane reactors and various separation processes. Future research should explore integrating MXenes with biocompatible polymers for biomedical applications and investigating MXene membrane performance in real-world scenarios, such as water purification and gas separation. This work paves the way for significant advancements in MXene-based technologies, offering promising solutions for environmental remediation and industrial applications.
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Keywords
Etching techniques, Membrane reactors, Membrane separation, Structural properties, Thermal stability