An adsorbent for carbon dioxide may include a composite metal oxide including a divalent first metal (M1), a trivalent second metal (M2), and an element (A) with an electronegativity of about 2.0 to about 4.0. The composite metal oxide may have an amorphous structure. A method of manufacturing the a
An adsorbent for carbon dioxide may include a composite metal oxide including a divalent first metal (M1), a trivalent second metal (M2), and an element (A) with an electronegativity of about 2.0 to about 4.0. The composite metal oxide may have an amorphous structure. A method of manufacturing the adsorbent for carbon dioxide and a capture module for carbon dioxide including the adsorbent for carbon dioxide are also disclosed.
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1. An adsorbent for carbon dioxide, comprising: a composite metal oxide including a divalent first metal (M1), a trivalent second metal (M2), and an element (A) having an electronegativity ranging from about 2.0 to about 4.0, the composite metal oxide having an amorphous structure, the element (A) b
1. An adsorbent for carbon dioxide, comprising: a composite metal oxide including a divalent first metal (M1), a trivalent second metal (M2), and an element (A) having an electronegativity ranging from about 2.0 to about 4.0, the composite metal oxide having an amorphous structure, the element (A) being included in an amount of 0.3 moles to 3 moles per one mole of a sum of the divalent first metal (M1) and the trivalent second metal (M2). 2. The adsorbent for carbon dioxide of claim 1, wherein the composite metal oxide is represented by the following Chemical Formula 1: [M11-xM2xAy]Oa [Chemical Formula 1]in Chemical Formula 1, M1 is a divalent first metal, M2 is a trivalent second metal, A is an element having an electronegativity of about 2.0 to about 4.0, x is in a range of 0.2 to 0.4, y is in a range of 0.3 to 3, and a is a number required for making a charge balance of oxygen with M1, M2, and A. 3. The adsorbent for carbon dioxide of claim 1, wherein the divalent first metal (M1) is selected from an alkaline-earth metal, a transition metal, and a combination thereof. 4. The adsorbent for carbon dioxide of claim 3, wherein the divalent first metal (M1) is selected from the group consisting of magnesium (Mg), calcium (Ca), strontium (Sr), nickel (Ni), manganese (Mn), iron (Fe), cobalt (Co), copper (Cu), zinc (Zn), beryllium (Be), and a combination thereof. 5. The adsorbent for carbon dioxide of claim 1, wherein the trivalent second metal (M2) is different from the divalent first metal (M1) and is selected from a Group 13 element, a transition metal, a lanthanide, and a combination thereof. 6. The adsorbent for carbon dioxide of claim 5, wherein the trivalent second metal (M2) is selected from the group consisting of aluminum (Al), chromium (Cr), manganese (Mn), iron (Fe), cobalt (Co), lanthanum (La), cerium (Ce), gallium (Ga), indium (In), vanadium (V), and a combination thereof. 7. The adsorbent for carbon dioxide of claim 1, wherein the mole ratio (M1/M2) between the divalent first metal (M1) and the trivalent second metal (M2) in the composite metal oxide is in a range of about 1.5/1 to about 4/1. 8. The adsorbent for carbon dioxide of claim 1, wherein the element (A) having an electronegativity ranging from about 2.0 to about 4.0 is selected from phosphorus (P), boron (B), fluorine (F), sulfur (S), chlorine (Cl), and a combination thereof. 9. The adsorbent for carbon dioxide of claim 8, wherein the electronegativity ranges from about 2.2 to about 4.0. 10. The adsorbent for carbon dioxide of claim 1, wherein the composite metal oxide is a calcined product of a composite metal hydroxide including a divalent first metal (M1), a trivalent second metal (M2), and an element (A) having an electronegativity of about 2.0 to about 4.0 but not including a carbonate anion. 11. The adsorbent for carbon dioxide of claim 1, further comprising: at least an alkali metal or an oxide of the alkali metal on a surface of the composite metal oxide. 12. A method of manufacturing an adsorbent for carbon dioxide, including a composite metal oxide, which includes a divalent first metal (M1), a trivalent second metal (M2), and an element (A) with an electronegativity ranging from about 2.0 to about 4.0 and has an amorphous structure, the method comprising: preparing a mixed aqueous solution by dissolving a salt of a divalent first metal and a salt of a trivalent second metal in water;adjusting pH of the mixed aqueous solution to be basic to precipitate a composite metal hydroxide:separating the composite metal hydroxide;mixing the composite metal hydroxide with an aqueous solution of a salt including an element with an electronegativity of about 2.0 to about 4.0 to obtain a mixture;adjusting pH of the mixture to be equal to or less than about 7 and stirring the mixture to prepare an ion-exchanged composite metal hydroxide;separating the ion-exchanged composite metal hydroxide from the mixture; andcalcining the ion-exchanged composite metal hydroxide to obtain a composite metal oxide, andwherein the salts of the divalent first metal and of the trivalent second metal do not include a carbonate anion, the element (A) being included in the composite metal oxide in an amount of 0.3 moles to 3 moles per one mole of a sum of the divalent first metal (M1) and the trivalent second metal (M2). 13. The method of claim 12, wherein the preparing a mixed aqueous solution includes selecting the salt of a divalent first metal from nitrates, acetates, and hydrates thereof, the divalent first metal selected from an alkaline-earth metal, a transition metal, and a combination thereof. 14. The method of claim 13, wherein the salt of a divalent first metal is selected from nitrates, acetates, and hydrates thereof and includes the divalent first metal selected from magnesium (Mg), calcium (Ca), strontium (Sr), nickel (Ni), manganese (Mn), iron (Fe), cobalt (Co), copper (Cu), zinc (Zn), beryllium (Be), and a combination thereof. 15. The method of claim 12, wherein the preparing an mixed aqueous solution includes selecting the salt of a trivalent second metal from nitrates, acetates, and hydrates thereof, the trivalent second metal being different from the divalent first metal and being selected from a Group 13 element, a transition metal, a lanthanide, and a combination thereof. 16. The method of claim 15, the salt of a trivalent second metal is selected from nitrates, acetates, and hydrates thereof, and includes the trivalent second metal selected from aluminum (Al), chromium (Cr), manganese (Mn), iron (Fe), cobalt (Co), lanthanum (La), cerium (Ce), gallium (Ga), indium (In), vanadium (V), and a combination thereof. 17. The method of claim 12, wherein the adjusting pH of the mixed aqueous solution includes modifying the pH of the mixed aqueous solution to a range of about 9 to about 12. 18. The method of claim 12, wherein the method further comprises aging the composite metal hydroxide with stirring at a temperature of 60° C. or lower. 19. The method of claim 12, wherein the method further comprises drying the composite metal hydroxide at a temperature of 60° C. or lower and under a pressure of atmospheric pressure or lower. 20. The method of claim 12, wherein the ion-exchanged composite metal hydroxide is represented by the following Chemical Formula 2, [M11-xM2x(OH)2]x+[((A1)y(A2)z(A3)1-y-z)n−x/n]x−.mH2O. [Chemical Formula 2]wherein M1 is the divalent first metal, M2 is the trivalent second metal, A1 is an anion of the salt of the divalent first metal, A2 is an anion of the salt of the trivalent second metal, A3 is an anion of the salt including an element having an electronegativity ranging from about 2.0 to about 4.0, each of x, y, and z is in a range of about 0.2 to about 0.4, y+z is less than 1, n is determined depending on valences of the anion A1, the anion A2, and the anion A3, and m is in a range of about 0 to about 8. 21. The method of claim 20, wherein the anion (A1) of the salt of the divalent first metal and the anion (A2) of the salt of the trivalent second metal is selected from a nitrate ion (NO3−), an acetate ion (CH3COO−), and a combination thereof. 22. The method of claim 12, wherein the salt including an element having an electronegativity ranging from about 2.0 to about 4.0 has an anion selected from a phosphate ion (PO43−), a borate ion (BO33), a sulfate ion (SO42−), a peroxosulfate ion (SO2O82−), a chloride ion (Cl−), a chlorate ion (ClO4−), a fluoride ion (F−), and a combination thereof. 23. The method of claim 12, wherein the salt including an element having an electronegativity ranging from about 2.0 to about 4.0 has a cation selected from K+, Ca2+, NH4+, Na+, and a combination thereof. 24. The method of claim 12, wherein the adjusting the pH of the mixture to be equal to or less than 7 includes maintaining the pH of the mixture in a range of about 3 to about 6 to facilitate the formation of the ion-exchanged composite metal hydroxide. 25. The method of claim 12, wherein the calcining is performed at a temperature ranging from about 200° C. to about 700° C. 26. A capture module for carbon dioxide comprising the adsorbent for carbon dioxide according to claim 1.
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