摘要
为了进一步提高活性碳纤维的CO_2吸附量和抗水性能,采用浸渍法将活性碳纤维进行改性处理,得到一系列改性样品,并对其进行了SEM和FTIR表征。研究了活性碳纤维种类、浸渍试剂(Na OH溶液、Zn Cl2溶液及离子液体)等对吸附剂孔结构、CO_2吸附量、循环使用性和抗水性能的影响,并探讨了CO_2在改性活性碳纤维内的动力学吸附扩散行为。研究结果表明:改性活性碳纤维的CO_2吸附性能和抗水性能均显著改善,其中CO_2最高吸附量达24.4%(0.1MPa和25℃),吸湿率减小到1.33%,且具有良好的吸附/脱附循环使用性。均相扩散模型(HSDM)描述了实时吸附数据,此模型能够较好地反映CO_2在样品内的扩散行为,改性活性碳纤维仍能保持良好的扩散速率,扩散系数Ds值数量级为10^(–5)m^2/s,与空白活性碳纤维相当。
In order to increase the CO2 adsorption capacity and to improve the water resistance of activated carbon fibers,a series of modified activated carbon fibers were prepared by impregnation method,and characterized by using scanning electron microscopy(SEM)and infrared spectroscopy(FTIR).The effects of the activated carbon fibers types and the immersion reagents(NaOH solution,ZnCl2 solution and ionic liquid)on the pore structure,CO2 adsorption capacity,cycling performance and water resistance of the adsorbents were studied.The adsorption kinetics and diffusion behaviors of CO2 in the modified activated carbon fibers were also discussed.The results show that the CO2 adsorption and water resistance of the modified activated carbon fibers are significantly improved,and the maximum adsorption capacity of CO2 is 24.4%(0.1MPa and 25℃),and the moisture absorption rate was reduced to 1.33%.The adsorbents also performed well during the adsorption/desorption cycles.The homogeneous diffusion model(HSDM)was used to describe the real-time adsorption data,and reflected the diffusion behavior of CO2 in the samples quite well.The modified activated carbon fiber can still maintain a high diffusion rate with the diffusion coefficients Ds at a level of 10-5m2/s,equivalent to that of the blank activated carbon fibers.
作者
李灿灿
朱佳媚
任婷
郭斌
严红芳
LI Cancan;ZHU Jiamei;REN Ting;GUO Bin;YAN Hongfang(School of Chemical Engineering and Technology,China University of Mining&Technology,Xuzhou 221116,Jiangsu,China)
出处
《化工进展》
EI
CAS
CSCD
北大核心
2018年第9期3520-3527,共8页
Chemical Industry and Engineering Progress
基金
国家自然科学基金(21606252)
中央高校基本科研业务费专项基金(2015XKMS044)项目
