Major Advances and Challenges in the Synthesis of Graphene Oxide-based Heterogeneous Catalysts
Author : Reyes, John Adriel Corsiga
Major Adviser : Gatdula, Kristel M.
Major Co-Adviser : Aguila, Mae Joanne B.
Committee Members : Dizon, Lisa Stephanie H.; Eusebio, Ramon Christian P.
Year : 2020
Month : August
Type : Thesis
Degree: BS
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Abstract
Graphene oxide (GO) has a wide range of applications in heterogeneous catalysis due to its large surface area, high stability, and compatibility with other catalysts. Catalysts with non-toxic synthesis and recycling capabilities are currently needed for different applications such as energy systems, organic synthesis, contaminant degradation, etc. GO- based heterogeneous catalysts are effective, recyclable, and clean materials for application to various industries. This study aimed to compare the synthesis methods available for graphene oxide-based heterogeneous catalysts as well as review possible routes for future utilization. The widely used method to synthesize graphene oxide was the Hummers method. Graphene oxide as catalyst support is usually synthesized by exfoliating GO to allow spaces in-between GO layers for other catalyst materials to adhere via weak interaction. The synthesized catalysts have shown promising results in terms of percent degradation of dyes because of the traits that GO delivers, such as stability and recyclability, in the composite catalyst. Majority of the GO-based catalysts in the methods discussed have degradations around 80-100%, which is a significant increase compared to the performance of catalysts not aided by GO. Some of the problems in the synthesis process are generally due to the incomplete understanding of the GO structure. The functionalized vii groups present are known in the material, but its exact active sites are still not identified. However, various models, such as the Lerf-Klinowski and Dekany models, have been proposed to further understand its mechanism. Heterogeneous GO-based catalysts are still needed to be improved for both synthesis and application to further enhance catalytic performance in a variety of fields.
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