| Grant number: | 21/14992-1 |
| Support Opportunities: | Scholarships in Brazil - Post-Doctoral |
| Start date: | August 01, 2022 |
| End date: | July 22, 2026 |
| Field of knowledge: | Engineering - Materials and Metallurgical Engineering - Nonmetallic Materials |
| Principal Investigator: | Luiz Henrique Capparelli Mattoso |
| Grantee: | João Otávio Donizette Malafatti |
| Host Institution: | Embrapa Instrumentação Agropecuária. Empresa Brasileira de Pesquisa Agropecuária (EMBRAPA). Ministério da Agricultura, Pecuária e Abastecimento (Brasil). São Carlos , SP, Brazil |
| Associated research grant: | 18/22214-6 - Towards a convergence of technologies: from sensing and biosensing to information visualization and machine learning for data analysis in clinical diagnosis, AP.TEM |
| Associated scholarship(s): | 23/03632-0 - Development of sensor arrays based on zeolite nanostructures functionalized with porphyrins for polyphenol detection, BE.EP.PD |
Abstract The cultivation of coffee has grown significantly in recent years, being one of the products with the highest benefit and consumption globally. However, wet processing of coffee generates large volumes of wastewater with a high content of phenolic compounds, such as caffeic and chlorogenic acid, which are toxic and persistent in the environment. Thus, it is necessary to control water quality after using it by monitoring the presence of the residual compounds. In this sense, chemical sensors become an alternative for quick, selective, sensitive detection, use in portable devices in the ultraviolet-visible region with a possible colorimetric alteration. Zeolites such as faujasite (FAU) have significant advantages attributed to the highest stability, elevated surface area, porosity, and lability due to the presence of charged counter ions. For this purpose, the presence of ions such as silver on the surface can interact with polyolefins, changing the optical properties of the contaminants. For sensor manipulation, the zeolites will be incorporated into a nanofiber membrane based on polycaprolactone (PCL) and polymethylmethacrylate (PMMA) due to biocompatibility and mechanical strength properties. To obtain nanofibers, solution blow spinning (SBS) is a methodology that allows the introduction of nanoparticles in a polymeric matrix simply and practically. Thus, this project proposes to obtain nanocomposites of PCL/PMMA/FAU nanofibers to monitor the coffee industry's pollutants. The FAU will be obtained from the part of the silica extracted from the rice husk, thus generating a second-generation product contributing to the functioning of the current circular economy proposals. The detections will be performed in a UV-visible spectrophotometer, and visual responses from colorimetric changes are also expected. This purpose seeks to understand the interactions that allow the sensor to function and the selectivity and sensitivity towards the contaminants of interest. (AU) | |
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