Carbon dioxide adsorption on amine-impregnated mesoporous materials prepared from spent quartz sand

Figures & data

Table 1. XRF analysis

Sample	SiO2	SO3	K2O	CaO	Fe2O3	TiO2
Waste quartz sand	99.9	0.0069	0.0136	0.0067	0.0275	0.0075
A-Q-MCM	99.9	0.0213	0.0082	0.051	0.0057	0.0094

Figure 1. BET patterns of Q-MCM and A-Q-MCM adsorbents.

Table 2. Physical properties characterized by BET analysis

Sample	Surface Area	Pore Volume (cm^3/g)	N Content (%)
MCM-41	1160.7	0.933	0.01
Q-MCM	1028.5	0.907	0.01
A-Q-MCM	619.9	0.536	2.74
M-DETA	8.1	0.012	10.6
M-TETA	3.4	0.0048	14.8
M-AMP	2.2	0.0029	5.82

Table 3. Elemental analysis of Q-MCM, A-Q-MCM, and C-MCM

Sample	C (%)	N (%)	C/N	Amine Concentration (%)
Q-MCM	0.58	0.01	58.00	0.01
A-Q-MCM	8.34	2.74	3.04	2.39
C-MCM	8.68	2.74	3.17	2.39

Figure 2. FT-IR spectra of Q-MCM and A-Q-MCM.

Figure 3. SEM micrographs of (a) A-Q-MCM and (b) Q-MCM.

Figure 4. Recycle runs of CO₂ by A-Q-MCM (adsorption at 25 °C and desorption at 100 °C for 120 min).

Figure 5. Effect of initial concentration of CO₂ on the breakthrough curve (A-Q-MCM).

Table 4. CO₂ adsorption properties of various microporous and mesoporous materials

Absorbent	CO2 Adsorption Capacity (mmol/g)	Adsorption Condition
Mesoporous carbon	1.51	298 K, 100 kPa (Saha et al., 2010)
MOF-177	1.73	298 K, 100 kPa (Saha et al., 2010)
Beta	1.75	303 K, 100 kPa (Xu et al., 2010)
M-AMP	1.14	298 K, 100 kPa (Jang et al., 2009)
M-DETA	1.87	298 K, 100 kPa (Jang et al., 2009)
M-TETA	2.22	298 K, 100 kPa (Jang et al., 2009)
Q-MCM	0.16	298K, 100 kPa
A-Q-MCM	2.08	298K, 100 kPa

Table 5. Summary of the Langmuir and Freundlich isotherm constants

Models	Langmuir Isotherm			Freundlich Isotherm
Equation	Q = Qm × KL × Co/(1 + KL × Co)			Q = KCo^1/^n
Coefficient	Qm	KL	R^2	n	K	R^2
Value	6.78	−0.001	0.836	−0.964	0.646	0.948

Saha, D., Z.B. Bao, F. Jia, and S.G. Deng. 2010. Adsorption of CO2, CH4, N2O, and N2 on MOF-5, MOF-177, and zeolite 5A. Environ. Sci. Technol. 44:1820–1826. doi:10.1021/es9032309

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