Enhanced heavy metal immobilization in cementitious materials through CO2 mineralization: A kinetic analysis and physicochemical evolution

IF 7.4 1区工程技术 Q1 CONSTRUCTION & BUILDING TECHNOLOGY

Construction and Building Materials Pub Date : 2024-11-29 DOI:10.1016/j.conbuildmat.2024.139363

Xinyu Zhu, Tao Wang, Zhenwei Yi, Zitao Yu, Kun Luo, Xiang Gao

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引用次数: 0

Abstract

The leaching of heavy metals (HMs) from industrial solid waste during its treatment and utilization has garnered extensive attention within the scientific community. The incorporation of cementitious materials to both consume waste and immobilize HMs within the construction sector is a promising strategy. Traditional suppression techniques, employing additives, incur higher costs and may adversely affect the mechanical performance of cement. This research introduces a CO₂ mineralization technology synergistically enhancing the immobilization of HMs, which inhibiting the leaching channels in cement-based materials and strengthening the chemical chelation of HMs, thereby suppressing their leaching. The results indicated that the cementitious materials, with a carbonation rate of 10 %-12 %, demonstrated enhanced physical adsorption and chemical chelation capabilities, achieving a 98 % reduction in Pb leaching and a decrease of over 50 % for Mn. Conversely, the post-mineralization reduction in free Ca²⁺ ions adversely affected the immobilization of soluble HMs like Cr(VI). Overall, this study aimed to enhance the efficacy of current methods for utilizing solid waste and sequestrating HMs whilst simultaneously pioneering innovative concepts for the mineralization application of cement-based materials.

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来源期刊

Construction and Building Materials 工程技术-材料科学：综合

CiteScore

13.80

自引率

21.60%

发文量

3632

审稿时长

82 days

期刊介绍： Construction and Building Materials offers an international platform for sharing innovative and original research and development in the realm of construction and building materials, along with their practical applications in new projects and repair practices. The journal publishes a diverse array of pioneering research and application papers, detailing laboratory investigations and, to a limited extent, numerical analyses or reports on full-scale projects. Multi-part papers are discouraged. Additionally, Construction and Building Materials features comprehensive case studies and insightful review articles that contribute to new insights in the field. Our focus is on papers related to construction materials, excluding those on structural engineering, geotechnics, and unbound highway layers. Covered materials and technologies encompass cement, concrete reinforcement, bricks and mortars, additives, corrosion technology, ceramics, timber, steel, polymers, glass fibers, recycled materials, bamboo, rammed earth, non-conventional building materials, bituminous materials, and applications in railway materials.