Journal
DESALINATION
Volume 473, Issue -, Pages -Publisher
ELSEVIER
DOI: 10.1016/j.desal.2019.114147
Keywords
Seawater; Metal cation; Calcium; Magnesium; Sodium bicarbonate; Desalination
Categories
Funding
- Human Resources Program in Energy Technology of the Korea institute of Energy Technology Evaluation and Planning (KETEP)
- Ministry of Trade, Industry and Energy, Korea [20174010201640]
- Korea Institute of Energy Technology Evaluation and Planning (KETEP)
- Ministry of Trade, Industry & Energy (MOTIE) of the Republic of Korea [20152010201850]
- Korea Evaluation Institute of Industrial Technology (KEIT) [20152010201850] Funding Source: Korea Institute of Science & Technology Information (KISTI), National Science & Technology Information Service (NTIS)
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A new desalination and carbon utilization method was developed using all of three major cations dissolved in seawater-based industrial wastewater (i.e., calcium, magnesium, and sodium). Here, three types of metal-based inorganic substances could be produced and utilized without additional energy requirements for precipitation reactions. Calcium and magnesium were separated in the form of hydroxide precipitates. Using a 30 wt% aqueous monoethanolamine (MEA) solution, carbon dioxide was captured and reacted with the hydroxides to produce calcium carbonate and magnesium carbonate. After Ca2+ and Mg2+ separation, sodium chloride was used to produce sodium bicarbonate based on the characteristics of primary alkanolamines mixed with a high concentration of sodium ions. The entire process produced 0.3819, 0.2549, and 0.4579 mol of calcium carbonate, magnesium carbonate, and sodium bicarbonate, respectively. X-ray diffraction (XRD) and scanning electron microscopy (SEM) were conducted to investigate their crystal structure. Moreover, FT-IR spectroscopy was utilized to investigate the ionic species under Na+-rich conditions.
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