A Process for Carbon Dioxide Capture Using Schiff Bases Containing a Trimethoprim Unit

Abstract

Environmental problems associated with the growing levels of carbon dioxide in the atmosphere due to the burning of fossil fuels to satisfy the high demand for energy are a pressing concern. Therefore, the design of new materials for carbon dioxide storage has received increasing research attention. In this work, we report the synthesis of three new Schiff bases containing a trimethoprim unit and the investigation of their application as adsorbents for carbon dioxide capture. The reaction of trimethoprim and aromatic aldehydes in acid medium gave the corresponding Schiff bases in 83%–87% yields. The Schiff bases exhibited surface areas ranging from 4.15 to 20.33 m2/g, pore volumes of 0.0036–0.0086 cm3/g, and average pore diameters of 6.64–1.4 nm. An excellent carbon dioxide uptake (27–46 wt%) was achieved at high temperature and pressure (313 K and 40 bar, respectively) using the Schiff bases. The 3-hydroxyphenyl-substituted Schiff base, which exhibited a meta-arrangement, provided the highest carbon dioxide uptake (46 wt%) due to its higher surface area, pore volume, and pore diameter compared with the other two derivatives with a para-arrangement.

CO2 Adsorption on the N- and P-Modified Mesoporous Silicas

“…Yaseen et al investigated Schiff bases derived from trimethoprim and aromatic aldehydes as adsorbents for carbon dioxide capture. Their high CO 2 adsorption capacity was attributed to the appropriate pore size distribution and the polar nature of the heteroatoms (N and O), as well as the Lewis-base nature of the new materials [ 37 ]. It was shown that polymers containing aromatic and phosphate units were suitable for CO 2 capture.…”

Impact on Poly(Vinyl chloride) of trimethoprim schiff bases as stabilizers

“…Schiff bases 1-3 were prepared as previously stated 21 by reaction of trimethoprim moiety with the aryl aldehyde derivatives to obtain the required compounds Figure 1. Standard techniques were used to demonstrate the chemical structure of synthesized materials.…”

Investigating CO2 storage properties of Pd(II) and Co(II) chelates of a Schiff's base ligand

“…The ease of manipulating the shape size of pores in MOFs with minor or rare chemical tuning making it attractive in improving the efficiency of the material for various applications [17,18]. In the quest for new adsorbents for CO 2 capture [41][42][43][44][45][46][47][48], we turned our attention to Schiff's base with metal complexes, because they are useful as biologically active compounds [19][20][21][22][23]. In particular, amoxicillin, which is used as an antibiotic to treat various infections, contains different aromatic rings and is characterized by high nitrogen and oxygen contents.…”