Synthesis and modification of MCM-41 with PEI using hydrothermal techniques in autoclave and microwave reactor

Synthesis and modification of MCM-41 with PEI using hydrothermal techniques in autoclave and microwave reactor

• Autor
• Yasmin Teles Barboza
• Co-autores
• Marília Rafaele Oliveira Santos , Silvia Maria Egues Dariva , Juliana Faccin De Conto Borges
• Resumo

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  The ordered mesoporous silica MCM-41 stands out due to its characteristics such as high surface area and pore volume. In this work, its synthesis is presented in two ways: via microwave and autoclave reactor. Microwave synthesis significantly accelerates the process by reducing reaction time, thanks to the rapid and uniform heating provided by microwaves, resulting in more adjustable pore sizes and larger specific surface areas. Additionally, this study performed the one-pot synthesis and modification of amine-modified MCM-41 using a microwave reactor and compared it to conventional synthesis in an autoclave reactor with post-synthesis impregnation modification. This study is pioneering, presenting promising results for one-step modification and synthesis, yielding a surface area almost three times larger than the conventional method. Physicochemical characterizations (BET, XRD, and FTIR) revealed surface areas of 1147 and 852 m² g^-1 for the silica synthesized using microwave and autoclave methods, respectively. Microwave technology proved effective, demonstrating that it is possible to obtain MCM-41-type silica in just 30 minutes while maintaining physicochemical properties. These results highlight the potential of this technique to optimize mesoporous silica synthesis processes, with important implications for future applications.

   

• Palavras-chave
• MCM-41, Microwave irradiation, One-pot modification.
• Área Temática
• Sintese e Caracterização