首页|Amine-impregnated nanoarchitectonics of mesoporous silica for capturing dry and humid 400 ppm carbon dioxide: A comparative study
Amine-impregnated nanoarchitectonics of mesoporous silica for capturing dry and humid 400 ppm carbon dioxide: A comparative study
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Various amine-impregnated mesoporous silica adsorbents were prepared for a comparative study of 400 ppm CO2 adsorption at room temperature(25 or 30 ℃)under dry and 60% relative humidity conditions.Five types of amines-polyethylenimine(PEI),tetraethylenepentamine(TEPA),triethylenetetramine(TETA),diethylenetri-amine(DETA),and ethylenediamine(EDA)-and three types of mesoporous silica with different pore structures(SBA-15,MCM-41,and MCM-48)were used.The amine loading amount was also optimized according to the CO2 adsorption results obtained using a thermogravimetric analyzer under dry conditions.SBA-15 samples with 50-60 wt% loadings of TEPA and TETA showed a relatively high adsorption capacity of approximately 2 mmol g~(-1).The adsorption capacities of EDA and DETA loaded samples were less than 0.5 mmol g~(-1).The PEI impregnated SBA-15 exhibited relatively high CO2 adsorption rate(0.058 mmol g~(-1)min~(-1)).X-ray diffraction,Fourier transform infrared spectroscopy,N2 adsorption/desorption,and scanning electron microscopy revealed that the amines filled the mesopores of the sample.The amines also covered the outer surface of the mesoporous silica with narrow pore sizes(MCM-41 and MCM48).In humid conditions,SBA-15 with 50 wt% loading of PEI,TEPA,and TETA showed an adsorption capacity of 2.16 mmol g~(-1),2.12 mmol g~(-1),and 1.80 mmol g~(-1),respectively.An enhanced capacity was observed under humid conditions,especially for the PEI-loaded samples.During the cyclic adsorption test,PEI-and TEPA-impregnated SBA-15 exhibited superior cycling stability compared to the sample with TETA,where the material retained a capacity of approximately 2 mmol g~(-1)over 10 cycles.
CO2 adsorptionDirect air captureMesoporous silicaAmineHumidity
Rajesh Kumar、Mahuya Bandyopadhyay、Madhu Pandey
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Graduate School of Engineering,Hiroshima University,Higashi-Hiroshima,739-8527,Japan
Institute of Infrastructure,Technology,Research and Management,IITRAM,Maninagar,Ahmedabad,380026,Gujarat,India
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