The synthesis of zirconium and tetraethylenepentamine bi-functionalized TiO2 for efficient CO2 adsorption

Abstract

In the present work, zirconium-doped metal oxide of TiO 2 (Zr N ) was synthesized and functionalized with different amount of tetraethylenepentamine (TEPA). The physical properties of the materials were tested using temperatureprogrammed desorption of NH 3 , X-ray diffractometer, X-ray photoelectron spectrometer, scanning electron microscope, transmission electron microscope, energy dispersion spectrum, Inductively coupled plasma atomic emission spectroscopy, Infrared spectrometer, N 2 adsorption-desorption analyzer, energy dispersion spectrum and thermogravimetric analyzer. Zr species has a positive effect on the enhancement of the thermal stability and amine utilization. After the introduction of Zr, the decomposition temperature of TEPA is improved to 180℃. Over TEPA decorated adsorbents, physical adsorption and chemical adsorption occurs simultaneously. When the adsorption time is 75℃, CO 2 flow rate is 20 mL/min, the adsorbent of TEPA(40)/TiO 2 (Zr 0.1 ) exhibit a remarkable amine utilization of 83.5%.

Carbon Dioxide Adsorption Performance and the Kinetic Properties of the Zirconium and Poly(ethyleneimine) Bifunctionalized Molecular Sieve of KIT-6

“…In Figure C, (a) is the IR spectrum of PEI(25)/Zr (0.1) -KIT-6 before the adsorption, (b) is that after the adsorption, and (c) is the difference between (a) and (b). Similar to the previous investigation, ,, four peaks at 1559, 1492, 1420, and 1342 cm –1 are obtained. The signals at 1559 and 1342 cm –1 are related to the C–O bonds in −COO – .…”

“…Over Zr (0.1) -KIT-6, the peaks at 1638 and 1080 cm −1 are concerned with the bending vibration of physically adsorbed H 2 O and the formation of Zr−O−Si bonds, respectively. 36 The results are in line with those of XRD, suggesting that some Si atoms are replaced by Zr heteroatoms. With the loading of PEI, amine groups react with the Zr−O−Si framework.…”

“…Figure gives the IR spectra of Zr (0.1) -KIT-6 and the modifier PEI(25)/Zr (0.1) -KIT-6 at different temperatures. Over Zr (0.1) -KIT-6, the peaks at 1638 and 1080 cm –1 are concerned with the bending vibration of physically adsorbed H 2 O and the formation of Zr–O–Si bonds, respectively . The results are in line with those of XRD, suggesting that some Si atoms are replaced by Zr heteroatoms.…”

“…With the lengthening of adsorption time, more and more gas molecules enter into the pore channels and contact the affinity sites. In this situation, fewer affinity sites are retained, resulting in a small improvement of adsorption capacity; , (3) the adsorption capacity increases first and then declines with the loading amount of PEI, which might be related to the variation of the N content and the pore structure. , Based on the TGA results, the amounts of N species increase with the improvement of the PEI loading amount. Hence, more and more basic sites are used to afford the chemical reaction with the gas adsorbates, resulting in the enhancement of the adsorption capacity.…”

“…With the lengthening of adsorption time, more and more gas molecules enter into the pore channels and contact the affinity sites. In this situation, fewer affinity sites are retained, resulting in a small improvement of adsorption capacity; 1, 36 (3) the adsorption capacity increases first and then declines with the loading amount of PEI, which might be related to the variation of the N content and the pore structure. 36,45 Based on the TGA results, the amounts of N species increase with the improvement of the PEI loading amount.…”