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Pyrolysis Behavior, Kinetic Analysis, and Biochar Production from Waste Flowers
Richa Gupta1, Ranjeet Kumar Mishra2, Kaustubha Mohanty1
1Department of Chemical Engineering, Indian Institute of Technology Guwahati, Guwahati, Assam 781039, India.
ACS Omega
|March 10, 2025
Summary
Waste flowers can be sustainably converted into biochar through pyrolysis. This study details the pyrolysis process, kinetic analysis, and characterization of biochar derived from marigold flowers, highlighting its potential for soil amendment and carbon sequestration.
Area of Science:
- Waste Management and Valorization
- Biomass Pyrolysis and Biochar Production
- Sustainable Chemistry and Circular Economy
Background:
- Waste flowers represent a significant organic waste stream with potential for sustainable valorization.
- Pyrolysis offers a promising thermochemical conversion pathway for converting floral waste into valuable biochar.
- Understanding the pyrolysis behavior and kinetics is crucial for optimizing biochar production and application.
Purpose of the Study:
- To investigate the pyrolysis behavior and kinetic parameters of waste flowers.
- To produce and characterize biochar from waste flowers for potential applications.
- To evaluate the feasibility of utilizing waste flowers for biochar production within a circular economy framework.
Main Methods:
- Thermogravimetric analysis (TGA) was used to study thermal degradation under various heating rates.
- Model-free kinetic methods (Friedman, Ozawa-Flynn-Wall, Starink, Kissinger-Akahira-Sunose) were applied to determine kinetic parameters.
- Biochar was produced in a semibatch reactor and characterized using proximate analysis, elemental analysis, BET surface area, FTIR, FESEM, and other techniques.
Main Results:
- Floral waste decomposition occurred in three stages: moisture removal, active pyrolysis, and residue formation.
- Kinetic analysis indicated a multistep reaction mechanism with average activation energies ranging from 221.50 to 236.35 kJ mol⁻¹.
- Pyrolysis of marigold flowers yielded 36.64 wt% biochar with 57.10% carbon content, a higher heating value of 33.57 MJ kg⁻¹, and a BET surface area of 9.96 m² g⁻¹.
Conclusions:
- Waste flowers are a viable feedstock for producing biochar with favorable characteristics for soil amendment and carbon sequestration.
- The kinetic data provides valuable insights for optimizing pyrolysis conditions for efficient biochar production.
- The study supports the utilization of floral waste for biochar production, contributing to sustainable waste management and circular economy principles.
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