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The TiO2 surface is functionalized with different concentrations of K2CO3 and polyethyleneimine (PEI), and in-depth research on CO2 adsorption performance and mechanism is conducted. CO2 low-temperature adsorbent was successfully prepared by ultrasonic impregnation method using K2CO3 and PEI as functionalized materials and commercial selective catalytic reduction (SCR) catalyst white embryo (porous TiO2) as carrier. The physicochemical properties of the modified adsorbents were characterized using X-ray diffraction (XRD), differential thermogravimetry (DTG), Fourier-transform infrared spectroscopy (FTIR) and X-ray photoelectron spectroscopy (XPS). The results indicate that, K2CO3 and PEI activate the porous structure of TiO2, enhancing the density of surface alkaline active sites. This enhancement facilitates the accommodation of PEI and K2CO3, exposes adsorption active sites, and promotes CO2 diffusion and CO2 adsorption. 50%PEI@TiO2 introduces numerous active functional groups and alkaline amine sites, achieving a CO2 adsorption capacity of 2.11 mmol/g. By measuring the CO2 adsorption by 50%PEI@TiO2 adsorbent and fitting to Langmuir and Freundlich adsorption isotherm models, it finds that CO2 is mainly adsorbed physically, and van der Waals force plays a major role during adsorption. The optimal adsorption and desorption temperatures for CO2 are 50 ℃ and 110 ℃, respectively. The cyclic experiment showed that, compared with PEI, K2CO3-loaded adsorbents exhibit greater stability, with a decrease in adsorption capacity of less than 10% after 30 cycles. These findings suggest that functionalized materials based on commercial SCR catalyst TiO2 pellets hold promise for low-temperature CO2 capture in industry flue gases.
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| 科 Family | 属数 Number of genus | 种数 Number of species | 占总种数比例 Percentage of total species (%) | 属 Genus | 种数 Number of species | 占总种数比例 Percentage of total species (%) |
|---|---|---|---|---|---|---|
| 鹅膏菌科Amanitaceae | 2 | 11 | 5.26 | 鹅膏菌属 Amanita | 10 | 4.78 |
| 小菇科 Mycenaceae | 2 | 12 | 5.74 | 丝盖伞属 Inocybe | 5 | 2.39 |
| 多孔菌科 Polyporaceae | 8 | 14 | 6.70 | 蜡蘑属 Laccaria | 5 | 2.39 |
| 红菇科 Russulaceae | 3 | 23 | 11.00 | 小皮伞属 Marasmius | 6 | 2.87 |
| 小菇属 Mycena | 11 | 5.26 | ||||
| 光柄菇属 Pluteus | 5 | 2.39 | ||||
| 红菇属 Russula | 17 | 8.13 | ||||
| 栓菌属 Trametes | 5 | 2.39 |
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