SELECTED KRAFT LIGNIN FRACTIONS AS PRECURSOR FOR CARBON FOAM: STRUCTURE-PERFORMANCE CORRELATION AND ELECTROCHEMICAL APPLICATIONS

Jéssica Souza Rodrigues; Amanda de Sousa Martinez de Freitas; Cristiane Carla Maciel; Vagner Roberto Botaro; Marystela Ferreira

Paper Title

Authors

Jéssica Souza Rodrigues
Amanda de Sousa Martinez de Freitas
Cristiane Carla Maciel
Vagner Roberto Botaro
Marystela Ferreira

Modality

Pôster

Subject area

Biossensores / Biomoléculas

Publishing Date

12/12/2023

Country of Publishing

Brasil

Language of Publishing

Inglês

Paper Page

https://www.even3.com.br/anais/workshop-do-ineo-2023/613069-selected-kraft-lignin-fractions-as-precursor-for-carbon-foam--structure-performance-correlation-and-electrochemic

ISBN

978-65-272-0088-8

Keywords

Kraft lignin; Lignin Fractions; Carbon Foams; Thermal decomposition. Electrochemical applications.

Summary

The rapid exhaustion of fossil fuels highlights the need for more sustainable solutions in material science. Thus, carbon materials with high structural efficiency and multifunctional integration are gaining more and more attention among studies that seek to meet high performance with sustainability. This study describes an efficient route for the synthesis of carbon foams (CF) derived from kraft lignin (KL) by thermal decomposition of a polyurethane (PU) sacrificial mold. The structure-performance correlation of CF produced by the partial replacement of phenol with KL, and its soluble (LFSol) and insoluble (LFIns) fractions were analyzed, and the intrinsic characteristics of the materials investigated. CFs were characterized by thermal analysis, X-ray diffractometry (XRD), Raman spectroscopy, scanning electron microscopy (SEM), Brunauer-Emmett-Teller (BET), and electrochemical (electrochemical impedance spectroscopy (EIS) and cyclic voltammetry (CV)). We herein showed that specific KL fractions can partially substitute phenol in the synthesis of LPF resin-based CFs withimproved final performance. The best performing sample was the lignin fraction soluble in ethyl acetate (FLSol). The improvement of LFSol solubility parameters together with the higher S/G ratio and ß-O-4/a-OH content after fractionation have been highlighted as key features to produce CFs with higher carbon yields (54%). XRD showed that all CF had amorphous porous structures which were partially graphitized by the simple carbonization process with a higher degree of graphitization for LFSol samples. In addition, an increase in BET surface area, porosity and the average pore volume was observed when LFSol was employed. The electrochemical measurements showed that LFSol presented the highest current density (2.11x10-4 mA.cm-2), corroborating the results obtained in the CV curves with the lowest charge transfer resistance value (0.26 KO) compared to the other samples, indicating that the electron transfer process was faster in the sensor produced with FLSol. FLSol's potential for application as an electrochemical sensor was tested at a proof of concept level, and demonstrated excellent selectivity for the detection of hydroquinone in water.

Title of the Event: Workshop do INEO 2023
City of the Event: Nazaré Paulista
Title of the Proceedings of the event: Anais do Workshop INEO 2023
Name of the Publisher: Even3
Means of Dissemination: Meio Digital
DOI: Get DOI

How to cite

RODRIGUES, Jéssica Souza et al.. SELECTED KRAFT LIGNIN FRACTIONS AS PRECURSOR FOR CARBON FOAM: STRUCTURE-PERFORMANCE CORRELATION AND ELECTROCHEMICAL APPLICATIONS.. In: Anais do workshop INEO 2023. Anais...Nazaré Paulista(SP) Hotel Estância Atibainha, 2023. Available in: https//www.even3.com.br/anais/workshop-do-ineo-2023/613069-SELECTED-KRAFT-LIGNIN-FRACTIONS-AS-PRECURSOR-FOR-CARBON-FOAM--STRUCTURE-PERFORMANCE-CORRELATION-AND-ELECTROCHEMIC. Access in: 27/07/2024