Ma Jiali, Liu Jie, Song Jiangfeng, Tang Tao
Department of Chemistry, College of Science, North University of China Taiyuan 030051 China
State Key Laboratory of Polymer Physics and Chemistry, Changchun Institute of Applied Chemistry, Chinese Academy of Sciences Changchun 130022 China
RSC Adv. 2018 Jan 10;8(5):2469-2476. doi: 10.1039/c7ra12733b. eCollection 2018 Jan 9.
Conversion of waste thermoplastics into porous carbons has attracted wide attention due to the requirement of recycling of large quantities of municipal solid waste. This work reports the preparation of porous carbon sheets on magnesium oxide from mixed thermoplastics including polyethylene, polypropylene, polystyrene, polyvinyl chloride, and polyethylene terephthalate in a closed autoclave at 500 °C. The influence of the weight ratio of magnesium oxide to mixed plastics on the yield and textural properties of the carbon was examined. The morphology and structure of the porous carbon were also characterized. The maximum BET surface area was 713 m g at a weight ratio of MgO/polymer of 4 and the maximum pore volume was 5.27 cm g at a weight ratio of MgO/polymer of 6. The reaction mechanism was explored by analyzing the product distribution and composition of gas and liquid at different reaction times. Aromatics were the main source for the growth of carbon. Model experiments of carbonization of different aromatics were conducted to evaluate the carbonization reactivity of aromatics. Polycyclic aromatic hydrocarbons, especially acenes, produced more carbon.
由于大量城市固体废物回收利用的需求，将废弃热塑性塑料转化为多孔碳已引起广泛关注。这项工作报道了在500℃的密闭高压釜中，由包括聚乙烯、聚丙烯、聚苯乙烯、聚氯乙烯和聚对苯二甲酸乙二酯在内的混合热塑性塑料在氧化镁上制备多孔碳片。研究了氧化镁与混合塑料的重量比对碳产率和织构性质的影响。还对多孔碳的形态和结构进行了表征。在MgO/聚合物重量比为4时，最大BET表面积为713 m²/g，在MgO/聚合物重量比为6时，最大孔体积为5.27 cm³/g。通过分析不同反应时间的产物分布以及气体和液体的组成来探索反应机理。芳烃是碳生长的主要来源。进行了不同芳烃碳化的模型实验以评估芳烃的碳化反应活性。多环芳烃，尤其是并苯，产生的碳更多。
