Adsorption of water vapor onto and its electrothermal desorption from activated carbons with different electric conductivities
Adsorption of water vapor onto and its electrothermal desorption from activated carbons with different electric conductivities
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DOI：
10.1016/j.seppur.2011.09.048
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发表时间：
2012-02
影响因子：
8.6
通讯作者：
Xin Li;Zhong Li
中科院分区：
文献类型：
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作者：
Xin Li;Zhong Li
本文主要研究了不同电导率的活性炭对水蒸气的吸附和电热解吸。利用微波在氮气气氛中对活性炭进行改性，然后利用x射线光电子能谱仪和电热实验分别对改性后的活性炭表面氧含量和导电性能进行表征。通过间歇吸附实验测定了改性活性炭上水蒸气的等温线。结果表明，微波辅助改性使活性炭表面氧含量降低，大大提高了活性炭的导电性，提高了活性炭对水的电热解吸效率。水的电热解吸速率随着交流电的电导率和施加在床上的电压的增加而增加。活性炭具有良好的导电性，可以使吸附在活性炭上的水更快地解吸。例如，对于AC900，只需要100秒就可以解吸掉AC900吸附水量的80%。
This work is mainly involved with study of adsorption and electrothermal desorption of water vapor on the activated carbons (ACs) with different electric conductivities. The ACs were modified by using microwave irradiation in a nitrogen atmosphere, and then the surface oxygen content and the electric conductivity performances of the modified samples were respectively characterized using X-ray photoelectron spectrometer and electric heating experiments. The isotherms of the water vapor on the modified ACs were measured by means of batch adsorption experiments. The results show that the microwave-assisted modification make the surface oxygen contents of the ACs decrease so that the electric conductivities of the ACs are greatly improved, which would enhance the electric heating desorption efficiency of water from the modified ACs. The electrothermal desorption rate of water increases with an increase in the electric conductivities of the ACs and in the voltage exerted on the bed. The better electric conductivity performances of the ACs could make the water adsorbed on the ACs be desorbed more quickly. For example, for the AC900, it only took 100s to desorb 80% of the amounts adsorbed of water on the AC900.