Titanium based organic polymers and a method of making and using same
A process of manufacturing NH2-MIL-125(Ti) for use in mitigating ingress of chlorine ions in concrete, comprising dissolving 2-amino-benzene dicarboxylic acid in a 1:1 ratio of dimethylformamide and methanol, adding a titanium (IV) isopropoxide to the mixture at 150° C. with constant stirring to form NH2-MIL-125(Ti), submerging the NH2-MIL-125(Ti) in dichloromethane for about 3 hours and separating the NH2-MIL-125(Ti). NH2-MIL-125(Ti) produced is activated and ready for use in cement-based concrete structures. NH2-MIL-125(Ti) is enabled to reduce the ingress of chlorine ions in concrete by at least 20%.
1. A method of making a cement-based concrete structure capable of mitigating ingress of chlorine ions, the method comprising:
providing cement;
providing NH2-MIL-125(Ti);
providing water;
providing aggregates
mixing the NH2-MIL-125(Ti) with the cement, the aggregates and water;
allowing the mixture of the NH2-MIL-125(Ti), the aggregates and the cement to set, thereby to form the cement-based concrete structure and wherein an average pore volume of the NH2-MIL-125(Ti) is 0.35 g/cm 3″ .
2. The method as claimed in claim 1 , wherein when mixing, the NH2-MIL-125(Ti) is mixed with the cement and the aggregates, so as to maintain the NH2-MIL-125(Ti) concentration in the mixture in the range of between 1% to 5% by cement mass.
3. The method as claimed in claim 1 , wherein when mixing, the NH2-MIL-125(Ti) is mixed with the cement and the aggregates, so as to maintain a NH2-MIL-125(Ti) concentration in the cement-based concrete mixture of about 5% by cement mass.
4. The method of claim 1 , wherein the cement-based concrete structure formed by the method is able to mitigate the ingress of chlorine ions by at least 20% compared to cement-based concrete structures lacking the NH2-MIL-125(Ti).
5. The method of claim 1 , wherein the cement-based concrete structure formed by the method, is able to decrease the penetration depth of chlorine ions in concrete structure by at least 17% compared to cement-based concrete structures lacking the NH2-MIL-125(Ti).
6. The method of claim 1 , wherein the addition of NH2-MIL-125(Ti) to the cement and the aggregates, has limited impact on the compressive strength response of the cement-based concrete structure.
7. The method of claim 1 , wherein the compressive strength response of the cement-based concrete structure is at least 91% compared to cement-based concrete structures lacking the NH2-MIL-125(Ti).
8. The method of claim 1 , wherein an average surface area of a NH2-MIL-125(Ti) molecule is about 1530 m 2 /g.
9. The method of claim 1 , wherein an average particle size of the NH2-MIL-125(Ti) is 0.1-0.5 microns.
10. The method as claimed in claim 1 , wherein providing NH2-MIL-125(Ti) comprises:
dissolving 2 amino-benzene dicarboxylic acid in a 1:1 ratio of dimethylformamide and methanol to form a mixture,
adding titanium (IV) isopropoxide to the mixture to form NH2-MIL-125(Ti),
submerging the NH2-MIL-125(Ti) in dichloromethane and,
separating the NH2-MIL-125(Ti).
11. The method as claimed in claim 10 , wherein after addition of titanium (IV) isopropoxide, a temperature of the mixture is maintained in the range of about 100° C. to about 200° C.
12. The method as claimed in claim 10 , wherein after addition of titanium (IV) isopropoxide, a temperature of the mixture is maintained at about 150° C.
13. The method as claimed in claim 10 , wherein the NH2-MIL-125(Ti) is activated and does not require heat activation.
14. The method as claimed in claim 10 , wherein the molecules of NH2-MIL-125(Ti) are rhombic in shape.