LAUSR.org creates dashboard-style pages of related content for over 1.5 million academic articles. Sign Up to like articles & get recommendations!

NOx sequestration by calcium aluminate cementitious materials

Photo by anniespratt from unsplash

Abstract This study quantifies NOx uptake efficiency and explores NOx binding mechanisms in calcium aluminate cementitious (CAC) materials. Comparison between unmodified and TiO2-modified CAC separates intrinsic NOx binding mechanisms from… Click to show full abstract

Abstract This study quantifies NOx uptake efficiency and explores NOx binding mechanisms in calcium aluminate cementitious (CAC) materials. Comparison between unmodified and TiO2-modified CAC separates intrinsic NOx binding mechanisms from those related to photocatalysis. Attributed to surface-related heterogeneous reactions, the NOx binding occurs in unmodified CAC at nitrite-to-nitrate ratio of 1: 1.3 and can be increased with surface area. The photocatalytic reactions in TiO2-modified CAC increase NOx uptake, and ~50% of converted NOx resists releasing back into the environment via dissolution. Compared to previously studied ordinary portland cement (OPC) materials, CAC increases NOx uptake capacity and demonstrates a more permanent NOx binding, potentially mitigating concerns related to the release of previously bound N-species in OPC. Examination of the interaction between NOx and a synthetic pure aluminum-bearing phase shows that the permanent NOx uptake in CAC could be largely attributed to the chemical binding of converted NOx within aluminum-bearing phases.

Keywords: nox uptake; calcium aluminate; nox binding; nox sequestration; aluminate cementitious

Journal Title: Cement and Concrete Research
Year Published: 2021

Link to full text (if available)


Share on Social Media:                               Sign Up to like & get
recommendations!

Related content

More Information              News              Social Media              Video              Recommended



                Click one of the above tabs to view related content.