Bagasse Activated Carbon Reactivation Promotes Adsorption of CO2

doi:10.15541/jim20160293

Abstract

Abstract:

Activated carbon (AC) was prepared from bagasse using ZnCl₂ as the activator. The new type of activated carbon (KAC) was prepared from AC using KOH as the second activator. CO₂ adsorption/desorption properties were determined by thermal gravimetric analysis method (TGA). The activated carbon materials were characterized by Fourier transform infrared spectroscope (FTIR), N₂ adsorption-desorption and scanning electron microscope (SEM). The results showed that CO₂ adsorption quantities of KAC and AC were 3.45 mmol/g and 1.79 mmol/g, respectively at 60℃. KAC has a better adsorption capacity than AC. The CO₂ adsorption capacity after five adsorption/desorption cycles showed no obvious changes, display the materials good regeneration performance. The results of FTIR spectra showed that the characteristic peaks of the two activated carbon materials were almost the same. The polarity of the activated carbon surface increased with the increase of hydroxyl and carboxyl groups on activated carbons. N₂ adsorption-desorption spectra and SEM images demonstrated that all the two kinds of materials had abundant pores, and KAC had much more pores which resulted in better adsorption capacity.

Key words: bagasse, activated carbon, reactivation, carbon dioxide, adsorption

CLC Number:

TQ174

WEI Jian-Wen, LIN Zhi-Feng, HE Ze-Yu, HE Kai-Kai, GENG Lin-Lin, LIAO Lei. Bagasse Activated Carbon Reactivation Promotes Adsorption of CO₂[J]. Journal of Inorganic Materials, 2017, 32(1): 18-24.

Figures/Tables 12

Fig. 1 AC and KAC mass changes with testing time

Fig. 2 Pseudo-first-order kinetic equation curves of CO2 absorption for the activated carbons

Fig. 3 Pseudo-second-order kinetic equation curves of CO2 absorption for the activated carbons

Table 1 Kinetics parameters of adsorption of CO2 on activated carbons

Models	Parameters	AC	KAC
Pseudo-first-order	q_e/(mmol•g^-1)	1.70	3.48
	k₁/(min^-1)	0.06	0.02
	R²	0.994	0.989
Pseudo-second-order	q_e/(mmol•g^-1)	2.37	8.17
	k₂/(mmol•g^-1•min^-1)	0.020	0.001
	R²	0.973	0.892

Fig. 4 Cyclic adsorption of CO2 by activated carbons

Fig. 5 Mass changes of CO2 desorbed activated carbons mass with cycle time

Fig. 6 Infrared spectra of activated carbons

Fig. 7 Isothermal adsorption of N2 by AC and KAC

Table 2 Pore structure parameters of samples

Samples	S_BET/(m²·g^-1)	V_total/(cm³·g^-1)	D_BET/nm
AC	991	0.43	1.72
KAC	2170	1.33	2.48

Fig. 8 Pore size distribution curves of mesopore and micropore of AC

Fig. 9 Pore size distribution curves of mesopore and micropore of KAC

Fig. 10 SEM images of activated carbons(a) AC; (b) AC; (c) KAC; (d) KAC

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Bagasse Activated Carbon Reactivation Promotes Adsorption of CO₂

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