# Ozonolysis of Lignin: From Extensive Degradation to Selective Ring‐Opening Oxidation

## TL;DR

This paper reviews how ozone can be used to modify lignin, a plant byproduct, to create new sustainable materials.

## Contribution

The paper bridges historical ozone use in pulp processing with its modern potential for selective lignin modification.

## Key findings

- Ozonolysis can break down lignin structures effectively.
- Ozone shows promise as a selective tool for lignin functionalization.
- Challenges remain in optimizing ozonolysis for lignin valorization.

## Abstract

Despite its potential as a renewable feedstock, lignin, a major component of plant cell walls and a by‐product of the pulp and paper industry, has long been underutilized. Historically, pulp mills employed ozonolysis, a powerful oxidative process, to delignify cellulosic fibers and break down lignin. The ability of this technique to modify lignin structures has attracted attention in recent years, creating opportunities for the development of novel lignin‐based materials with improved functions. This review revisits the use of ozone as a bleaching agent and bridges its historical role in pulp processing with its emerging potential as a selective oxidative tool for lignin modification in materials chemistry. We discuss the fundamental chemical processes, significant developments in ozonolysis technology, and its potential to functionalize sustainable biomaterials. We also give our perspectives on the present obstacles and potential opportunities for ozonolysis optimization in lignin valorization.

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