Peyravi Arman, Ahmadijokani Farhad, Arjmand Mohammad, Hashisho Zaher
Department of Civil and Environmental Engineering, University of Alberta, Edmonton, AB T6G 1H9, Canada.
Nanomaterials and Polymer Nanocomposites Laboratory, School of Engineering, University of British Columbia, Kelowna, BC V1V 1V7, Canada.
J Hazard Mater. 2022 Jul 5;433:128792. doi: 10.1016/j.jhazmat.2022.128792. Epub 2022 Mar 26.
Microwave regeneration of adsorbents offers several advantages over conventional regeneration methods; however, its application for microwave transparent adsorbents such as polymers is challenging. In this study, hypercrosslinked polymer/graphene oxide (GO) nanocomposites with large surface area and enhanced microwave absorption ability were synthesized. Polymers of 4, 4´-bis ((chloromethyl)-1, 1´-biphenyl- benzyl chloride) were hypercrosslinked through the Friedel-Crafts reactions. GO sheets were synthesized through the Hummer's method. Nanocomposites with different GO contents (1-8 wt%) were synthesized by solution mixing method. Thermogravimetry analysis revealed a large enhancement in the thermal stability of GO-filled nanocomposites compared to pristine polymer. N adsorption isotherm analysis showed 7% and 10% reduction in BET surface area and total pore volume of the nanocomposite with 8 wt% GO. Compared to the pristine polymer, the dielectric constant and dielectric loss factor increased from 5 to 17 and 0.05-1.6, respectively, for the nanocomposites with 8 wt% GO. Microwave-assisted desorption of toluene from samples revealed more than 160 ºC and 4 times improvement in the desorption temperature and desorption efficiency, respectively, by addition of 4 wt% GO to the polymer. This study showed the important role of GO addition for efficient microwave-assisted regeneration of polymer adsorbents.
与传统再生方法相比，吸附剂的微波再生具有若干优势；然而，将其应用于聚合物等微波透明吸附剂具有挑战性。在本研究中，合成了具有大表面积和增强微波吸收能力的超交联聚合物/氧化石墨烯（GO）纳米复合材料。4,4´-双（（氯甲基）-1,1´-联苯-苄基氯）聚合物通过傅-克反应进行超交联。GO片通过Hummer法合成。采用溶液混合法合成了具有不同GO含量（1-8 wt%）的纳米复合材料。热重分析表明，与原始聚合物相比，GO填充的纳米复合材料的热稳定性有很大提高。N吸附等温线分析表明，含8 wt% GO的纳米复合材料的BET表面积和总孔体积分别降低了7%和10%。与原始聚合物相比，含8 wt% GO的纳米复合材料的介电常数和介电损耗因子分别从5增加到17和从0.05增加到1.6。对样品进行微波辅助甲苯脱附实验表明，向聚合物中添加4 wt% GO后，脱附温度提高了160多摄氏度，脱附效率提高了4倍。本研究表明，添加GO对聚合物吸附剂的高效微波辅助再生具有重要作用。
