Alkaline ethanolamine as dual-functional agent: Effective CO2 capture agent and corrosion inhibitor for structural applications

IF 13.3 1区工程技术 Q1 ENGINEERING, CHEMICAL

Chemical Engineering Journal Pub Date : 2024-12-21 DOI:10.1016/j.cej.2024.158810

Yoganandan Govindaraj, Ryosuke Saito, Keiichi Yano, Masatoshi Sakairi, Koji Fushimi, Ryoma Kitagaki, Yogarajah Elakneswaran, Hisanori Senboku, Yuya Yoda, Masato Tsu-jino, Akira Nishida

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引用次数: 0

Abstract

Continuous CO₂ emissions from automobiles and industrial sources pose significant environmental challenges. Concrete absorbs CO₂ from the atmosphere which accelerates corrosion of rebar. The objective of this study is to propose a revolutionary technique to use 2-(methylamino)ethanol (MAE) and N-Methyldiethanolamine (MDEA) as dual-functional agents for CO₂ absorption and corrosion inhibition. This study investigates the effect of MAE and MDEA on the carbonation of a simulated concrete pore solution (saturated Ca(OH)₂ solution containing NaCl) and simultaneously analyses the changes in microstructure, composition, and electrochemical properties of the steel exposed. Results showed that the presence of 5–10 mass% of MAE and MDEA in solution effectively absorbs CO₂, stabilizing pH between 8 and 9. XRF analysis showed that adsorbed Ca on steel was decreased from 30 mass% to 1 mass% due to the presence of 0.1 mol/dm⁻³(−|-) NaCl in a saturated Ca(OH)₂ (S1C) solution. Electrochemical test results showed that 10 mass % of MAE and MDEA addition in S1C exhibited an outstanding inhibition performance with 99.5 % inhibition efficiency. The excellent polarization resistance of steel with a low i_corr value of 70nA cm⁻² was observed in a carbonated SIC solution containing 10 mass % of MAE. Furthermore, local electrochemical measurements using a newly designed flow-type droplet cell showed that 10 mass% MAE is an effective inhibitor at welded zones. These findings highlight MAE as a promising candidate for corrosion inhibition of rebar in carbonated Ca(OH)₂ solution, suggesting valuable applications in enhancing the safety of critical infrastructures.

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来源期刊

Chemical Engineering Journal 工程技术-工程：化工

CiteScore

21.70

自引率

9.30%

发文量

6781

审稿时长

2.4 months

期刊介绍： The Chemical Engineering Journal is an international research journal that invites contributions of original and novel fundamental research. It aims to provide an international platform for presenting original fundamental research, interpretative reviews, and discussions on new developments in chemical engineering. The journal welcomes papers that describe novel theory and its practical application, as well as those that demonstrate the transfer of techniques from other disciplines. It also welcomes reports on carefully conducted experimental work that is soundly interpreted. The main focus of the journal is on original and rigorous research results that have broad significance. The Catalysis section within the Chemical Engineering Journal focuses specifically on Experimental and Theoretical studies in the fields of heterogeneous catalysis, molecular catalysis, and biocatalysis. These studies have industrial impact on various sectors such as chemicals, energy, materials, foods, healthcare, and environmental protection.