Abstract
To address global warming through carbon dioxide storage, three valsartan metal complexes were synthesized in excellent yields (87–92%) through a reaction of the appropriate metal chloride (tin chloride, nickel chloride hexahydrate, or magnesium chloride hexahydrate) and excess valsartan (two mole equivalents) in boiling methanol for 3 h. The structures of the metal complexes were established based on the data obtained from ultraviolet-visible, Fourier transform infrared, and proton nuclear magnetic resonance spectra, as well as from elemental analysis, energy-dispersive X-ray spectra, and magnetic susceptibility. The agglomeration and shape of the particles were determined using field emission scanning electron microscopy analysis. The surface area (16.63–22.75 m2/g) of the metal complexes was measured using the Brunauer-Emmett-Teller method, whereas the Barrett-Joyner-Halenda method was used to determine the particle pore size (0.011–0.108 cm3/g), total average pore volume (6.50–12.46 nm), and pore diameter (6.50–12.47 nm), for the metal complexes. The carbon dioxide uptake of the synthesized complexes, at 323 K and 4 MPa (40 bar), ranged from 24.11 to 34.51 cm2/g, and the nickel complex was found to be the most effective sorbent for carbon dioxide storage.
Highlights
Earth’s atmosphere acts as a solar energy snare to maintain the global temperature at a natural average level to make life on earth possible
The field emission scanning electron microscopy (FESEM) and energy dispersive X-ray (EDX) analyses were performed on a TESCAN MIRA3 LMU system (Kohoutovice, Czech Republic) at an accelerating voltage of 15 kV
The synthesized metal complexes were characterized (EDX), which confirmed the types of elements that each complex contained
Summary
Earth’s atmosphere acts as a solar energy snare to maintain the global temperature at a natural average level to make life on earth possible. Porous materials with large surface areas have been used as CO2 storage media [10] Such materials have different adsorption capacities depending on their structure [27]. N-{4-[(1-(1H-tetrazol-5-yl) phenyl) benzyl}-N-valeryl-L-valine, is a medication that is mainly used to reduce high blood pressure and to treat heart failure [33,34] It is highly stable, has a high molecular weight (435.5), a high aromatic content (two aryl groups and a tetrazole ring), has various functionalities (ketone, ester, and NH), and contains a high proportion (27%) of heteroatoms (nitrogen and oxygen). We showed that various materials can be used as efficient media for CO2 capture [35,36,37,38]
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