Study on cellulose degradation induced by hydroxyl radical with cellobiose as a model using GC-MS, ReaxFF simulation...

Area of Science:

• Biomass degradation
• Chemical kinetics
• Computational chemistry

Background:

• Cellulose is a key biopolymer with extensive industrial applications.
• Understanding cellulose degradation mechanisms is crucial for biomass conversion and material science.
• Hydroxyl radicals (OH) are significant agents in cellulose decomposition.

Purpose of the Study:

• To investigate the degradation products of cellulose induced by hydroxyl radicals.
• To elucidate the reaction pathways of cellulose degradation using computational methods.
• To validate simulation results with experimental data and quantum chemical calculations.

Main Methods:

• Analysis of reaction products using Gas Chromatography-Mass Spectrometry (GC-MS).
• ReaxFF (Reactive Force Field) kinetics simulations to model degradation pathways.
• Density Functional Theory (DFT) quantum chemistry calculations (B3LYP/6-31+g(d,p)) for validation.

Main Results:

• Identified C2-C5 degradation products, including oxaldehyde, malonaldehyde, and 2-hydroxysuccinaldehyde.
• Simulated four reaction pathways detailing the formation of small molecular products from glucose units.
• Confirmed that H-abstraction by OH initiates saccharide ring opening and glycosidic bond breakage.

Conclusions:

• ReaxFF kinetics simulations are effective for exploring OH-induced cellulose degradation mechanisms at room temperature.
• The computational approach accurately correlates with experimental findings.
• The study provides detailed insights into the molecular mechanisms of cellulose degradation.