Abstract:

Microwave regeneration technology is recognized as a high-efficiency and energy-saving regeneration technology.In this study, in order to decrease the temperature gradient in adsorbent beds under microwave radiation, a novel composite activated carbon with high thermal conductivity was prepared by adding expanded graphite and its regeneration under microwave radiation was investigated.The results show that the thermal conductivity of the composite activated carbon is about 6 times higher than that of the traditional commercial activated carbon while its adsorption capacity decreases a little.And the temperature difference in the composite activated carbon bed under microwave radiation is 10—30℃, less than that in the commercial activated carbon bed.The activation energy for desorption of toluene on the composite activated carbon (18.08 kJ·mol^-1) is smaller than that on the industrial activated carbons (24.84 kJ·mol^-1).Thus the composite activated carbon with high thermal conductivity not only has good adsorption properties, but also has good applicability to microwave radiation.

Key words: 微波适应型复合活性炭；微波脱附；热导率；脱附活化能；FONT-SIZE: 10.5pt, mso-bidi-font-size: 11.0pt, mso-font-kerning: 1.0pt, mso-ansi-language: EN-US, mso-fareast-language: ZH-CN, mso-bidi-language: AR-SA, mso-fareast-font-family: 宋体" lang=EN-US>VOCs

摘要：

微波再生技术被广泛认为是一种高效、节能的绿色再生技术。本文通过引入高热导率物质——膨胀石墨制备出新型微波适应型复合活性炭，解决目前活性炭在微波脱附过程中存在的温度梯度问题，同时开发VOCs活性炭吸附-微波再生技术。结果表明，制得的复合活性炭具有与普通商业活性炭相当的吸附性能，且其热导率提高6倍。同时，其甲苯脱附活化能为18.08 kJ·mol^-1,低于其在商业活性炭上的微波脱附活化能（24.84 kJ·mol^-1）25%以上；相同微波功率下，其脱附床层温度低于实验室制备的普通活性炭10～30℃。所制备的高热导率复合活性炭不仅具有良好的吸附性能，而且具有很好的微波适应性。

关键词: 微波适应型复合活性炭；微波脱附；热导率；脱附活化能；FONT-SIZE: 10.5pt, mso-bidi-font-size: 11.0pt, mso-font-kerning: 1.0pt, mso-ansi-language: EN-US, mso-fareast-language: ZH-CN, mso-bidi-language: AR-SA, mso-fareast-font-family: 宋体" lang=EN-US>VOCs