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Kinetic analysis of kraft lignin conversion via the Fenton process: process optimization and stochastic modelling

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Author(s):
Ramos, Lucas ; Maltempi-Mendes, Giovani ; Siqueira, Adriano Francisco ; Napoleao, Diovana Aparecida dos Santos ; Chandel, Anuj Kumar
Total Authors: 5
Document type: Journal article
Source: REACTION CHEMISTRY & ENGINEERING; v. 10, n. 1, p. 11-pg., 2024-10-23.
Abstract

Lignin is a macromolecule with a highly branched and complex structure, making it difficult to degrade. It is a by-product of the pulp and paper industry and extensive treatment is required to mitigate environmental issues associated with effluent discharge. As an alternative, lignin can be treated through advanced oxidative processes (AOPs) using the Fenton reaction, which involves hydrogen peroxide (H2O2) and iron ions. In this context, a rotational central composite design (RCCD) was conducted to optimize lignin degradation using different molar ratios of H2O2/Fe2+ and H2O2/Fe3+ to assess the synergistic catalytic action of ions. The reactions were conducted in a batch reactor (2 L capacity), and a kinetic study of lignin degradation was performed using a stochastic model to characterize the oxidative process. Optimized conditions for the Fenton reaction were predicted, adopting a molar ratio of H2O2/Fe2+ of 9.0 and H2O2/Fe3+ of 6.0. The optimal conditions resulted in a 47.3% reduction in total organic carbon (TOC), reaching a conversion of over 80% in the depolymerization process. A quadratic model performed for the response variable TOC reduction showed a correlation coefficient (R-2) of 0.926, indicating the model's quality and its ability to predict the variable with the greatest influence on the lignin depolymerization process. Further, Pseudomonas putida exhibited growth on low-molecular-weight aromatic molecules after depolymerization of kraft lignin. (AU)

FAPESP's process: 23/08226-0 - Lignin-derived catalyst ink for printed electrodes
Grantee:Lucas Ramos
Support Opportunities: Scholarships in Brazil - Post-Doctoral
FAPESP's process: 22/13184-1 - Lignin-derived catalyst ink for printed electrodes
Grantee:Anuj Kumar
Support Opportunities: Regular Research Grants
FAPESP's process: 20/12559-6 - Bio-valorization of lignin from Kraft pulp mills through establishment of Pulp-Ligcon metagenome sequencing
Grantee:Anuj Kumar
Support Opportunities: Research Grants - Young Investigators Grants