Greener method of carbon capture using waste biomass

Starbons, made from waste biomass including food peelings and seaweed, were discovered and first reported 10 years ago by the York Green Chemistry Centre of Excellence. Using these renewable materials provides a greener, more efficient and selective approach than other commercial systems of reducing emissions.

Current widespread methods of carbon capture, such as amine treating, use liquid solutions for the treatment of emissions from chemical plants and refineries. However, these are expensive to run and require a lot of input energy compared with a relatively low output.

The synthetic make-up of Starbons, which contains pores, results in the absorption of up to 65 percent more CO₂ than other methods.

Starbons are also more selective in capturing CO₂ when mixed with nitrogen, with results showing a capture rate of 20:1 rather than 5:1 -- four times more selective than other methods.

The materials also retain their CO₂ absorption and selectivity in the presence of water, and have extremely fast rates of CO₂ absorption and desorption.

Such enhanced properties for carbon capture, in a material that is sustainable and low-cost to make, holds significant potential for helping to reduce emissions from many manufacturing plants and power stations in the UK and around the world.

Professor Michael North, Professor of Green Chemistry at the University of York, said: "This work is of fundamental importance in overturning established wisdom associated with gas capture by solids. It defies current accepted scientific understanding of the efficiency of carbon-capturing CO₂, and has the potential to be of significant commercial and governmental value in helping the UK meet its CO₂ emissions reduction promises.

Professor James Clark, Head of York's Green Chemistry Centre of Excellence, said: "The high CO₂ adsorption, high selectivity, rapid kinetics and water tolerance, combined with the low cost and ease of large scale production from waste biomass, gives Starbons great potential. We hope to offer the product as a commercial capture agent for separating CO₂ from chemical or power station waste streams."