Porous Graphitized Carbon for Adsorptive Removal of Benzene and the Electrothermal Regeneration

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• 作者：Jinjun Li ; Renjie Lu ; Baojuan Dou ; Chunyan Ma ; Qiuhong Hu ; Yan Liang ; Feng Wu ; Shizhang Qiao ; Zhengping Hao
• 刊名：Environmental Science & Technology (ES&T)
• 出版年：2012
• 出版时间：November 20, 2012
• 年：2012
• 卷：46
• 期：22
• 页码：12648-12654
• 全文大小：383K
• 年卷期：v.46,no.22(November 20, 2012)
• ISSN：1520-5851

文摘

Graphitized carbons with mesoporous and macroporous structures were synthesized by a facile template-catalysis procedure using resorcinol and formaldehyde as carbon precursors and particulate hydrated metal oxides as both template and catalyst precursors. The materials were used as novel adsorbents for low-concentration benzene vapor. Furthermore, on the basis of the good electrical conductivities associated with the graphitized structures, an electrothermal desorption technique, which involved passing electric currents through the adsorbents to generate Joule heat, was employed to regenerate the saturated adsorbents and produce enriched benzene vapors. In comparison to microporous activated carbon, the porous graphitized carbons could afford a much quicker and more efficient regeneration by electrothermal desorption technique due to their enhanced conductivity and larger pore sizes. In addition, the concentration of the desorbed organics could be controlled by adjusting the applied voltages, which might be interesting for practical secondary treatment. It is promising that the joint utilization of porous graphitized carbon adsorbents and electrothermal desorption technique might develop effective and energy-saving processes for VOCs removal.