蔗渣活性炭二次活化制备及其吸附CO2性能研究

doi:10.15541/jim20160293

无机材料学报 ›› 2017, Vol. 32 ›› Issue (1): 18-24.DOI: 10.15541/jim20160293 CSTR: 32189.14.10.15541/jim20160293

蔗渣活性炭二次活化制备及其吸附CO₂性能研究

魏建文, 林志峰, 何泽瑜, 和凯凯, 耿琳琳, 廖雷

(桂林理工大学广西矿冶与环境科学实验中心, 桂林 541004)

收稿日期:2016-05-03 修回日期:2016-06-20 出版日期:2017-01-20 网络出版日期:2016-12-15
作者简介:魏建文(1975–), 男, 博士, 副教授. E-mail: jianwen988@126.com
基金资助:
国家自然科学基金(51566003);广西自然科学基金(2015GXNSFAA139231);广西环境污染控制理论与技术重点实验室基金(Gui Ke Neng0901z003);广西高等学校高水平创新团队及卓越学者计划项目

Bagasse Activated Carbon Reactivation Promotes Adsorption of CO₂

WEI Jian-Wen, LIN Zhi-Feng, HE Ze-Yu, HE Kai-Kai, GENG Lin-Lin, LIAO Lei

(Guangxi Scientific Experiment Center of Mining, Metallurgy and Environment, Guilin University of Technology, Guilin 541004, China)

Received:2016-05-03 Revised:2016-06-20 Published:2017-01-20 Online:2016-12-15
About author:WEI Jian-Wen. E-mail: jianwen988@126.com
Supported by:
National Natural Science Foundation of China (51566003);Natural Science Foundation of Guangxi (2015GXNSFAA 139231);Guangxi Key Laboratory of Environmental Pollution Control Theory and Technology (Gui Ke Neng901z003);High Level Innovation Team and Outstanding Scholar Program in Guangxi

摘要/Abstract

摘要：

以蔗渣为原料, 以ZnCl₂为活化剂制备出活性炭AC, 并用KOH对活性炭AC进行二次活化制备活性炭KAC。用热重法测定材料的CO₂吸附脱附性能, 傅里叶红外光谱、氮气物理吸附-脱附和扫描电镜对样品进行表征。结果表明：KAC具有优异的CO₂吸附性能, 在60℃下其对CO₂吸附量可达3.45 mmol/g, 而AC的CO₂吸附量仅有1.79 mmol/g。KAC的CO₂吸附能力明显优于AC。循环吸附脱附的结果表明, 经过5次吸附-脱附, 材料的吸附量无显著变化, 表明材料具有良好的再生性能。傅里叶红外分析结果表明两种活性炭材料的特征峰基本一致, 活性炭表面官能团中羟基和羧基可以使活性炭表面的极性增大。氮气物理吸附-脱附和扫描电镜结果表明材料都具有发达的孔径结构, 但KAC的孔径结构比AC更发达, 因此其对CO₂的吸附能力也更强。

关键词: 蔗渣, 活性炭, 二次活化, 二氧化碳, 吸附

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

中图分类号:

TQ174

魏建文, 林志峰, 何泽瑜, 和凯凯, 耿琳琳, 廖雷. 蔗渣活性炭二次活化制备及其吸附CO₂性能研究[J]. 无机材料学报, 2017, 32(1): 18-24.

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.

图/表 12

图1 AC和KAC质量随测试时间的变化

Fig. 1 AC and KAC mass changes with testing time

图2 活性炭吸附CO2的拟一级动力学方程曲线

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

图3 活性炭吸附CO2拟二级动力学方程曲线

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

表1 活性炭吸附CO2的动力学参数

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

图4 活性炭对CO2的循环吸附

Fig. 4 Cyclic adsorption of CO2 by activated carbons

图5 脱附CO2后, 活性炭质量随循环次数的变化

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

图6 活性炭的红外光谱图

Fig. 6 Infrared spectra of activated carbons

图7 AC和KAC对N2的等温吸附曲线

Fig. 7 Isothermal adsorption of N2 by AC and KAC

表2 样品的孔结构参数

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

图8 AC的中孔和微孔孔径分布曲线

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

图9 KAC的中孔和微孔孔径分布曲线

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

图10 活性炭的SEM照片

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

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蔗渣活性炭二次活化制备及其吸附CO₂性能研究

Bagasse Activated Carbon Reactivation Promotes Adsorption of CO₂

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