Work

Enhancing sustainable utilization of iron-based alkaline solid wastes for carbon mineralization: Insights into CO2 transport and adsorption dynamics

Year: 2024

Type: article

Abstract: Iron-based alkaline solid wastes provide substrates for carbon mineralization , addressing global warming. However, the mechanisms of CO 2 transport and adsorption within their porous structures are not fully understood. Using advanced grand canonical Monte Carlo (GCMC) methods, this study explores CO 2 transport and adsorption in iron-based alkaline wastes under different humidity conditions. The results show that FeO and Fe 2 O 3 reduce the CO 2 adsorption capacity in calcium hydroxide (CH) nanopores , a key component of these wastes. The presence of iron-based solids causes inhomogeneous porewater distribution, diminishing CO 2 dissolution and adsorption on the gas-liquid interface. By analyzing adsorption energy and CO 2 diffusion coefficients , we found that iron-based porous systems have lower CO 2 transport efficiency and storage capacity, highlighting their limited carbonation potential. The weak CO 2 -surface interactions in these wastes are identified as the primary challenge to improving carbon mineralization. These findings provide crucial insights for enhancing the sustainable use of iron-based alkaline wastes.

Source: Developments in the Built Environment

DOI: 10.1016/j.dibe.2024.100595

Authors: Gen Li, Jie Yang, Hao Li, Jiaxiang Liew, Jiasheng Huang

Institutions: Shenzhen Institute of Advanced Electronic Materials, Hong Kong Polytechnic University

Language: English

Topic: CO2 Sequestration and Geologic Interactions

Subfield: Environmental Engineering

Field: Environmental Science

Domain: Physical Sciences

SDGs: Responsible consumption and production, Climate action

Open Access status: gold

Estimated APC paid: $2,840