Capturing and sequestering carbon dioxide in soils

Soils contain the largest reservoir of carbon at the Earth’s surface. Soil respiration, or decomposition of soil carbon by microorganisms and respiration by roots, releases carbon dioxide at a rate about 7-8 times greater than fossil fuel burning. Soil-based carbon mitigation strategies have focused on reducing rates of decomposition or increasing soil acidity or alkalinity. However, the concentrations of carbon dioxide in soil pores is typically 45-50 times greater than atmospheric levels. This project aims to design a strategy for soil carbon dioxide capture using low-cost, environmentally friendly sorbent materials. The researchers will assess common sorbent materials for carbon dioxide sorption under typical soil gas mixtures, determine long-term stability of sorbed carbon dioxide, and develop a model framework for assessment and verification.