Emmanuel Dan , Alan J. McCue , Davide Dionisi , Claudia Fernández Martín
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引用次数: 0
摘要
微波(MW)加热是将聚对苯二甲酸乙二酯(PET)转化为多孔吸附剂的一种方法。评估了在 400 °C 下以不同持续时间(3 - 35 分钟)辐照 PET 衍生吸附剂的产量、质地特性和二氧化碳吸收率。MW活化时间对所得吸附剂的物理性质和二氧化碳吸收能力都有影响。产率随着活化时间的延长而下降,但表面积、总孔体积、微孔体积和二氧化碳吸收能力都随着功率活化时间的延长而增加,然后再下降。与用作参考的商业活性炭相比,最佳样品(用 5 分钟兆瓦活化时间制得)显示出更好的质地特性以及更高的平衡和动态二氧化碳吸收能力。这种吸附剂对 10:90%vol/vol CO2:N2 混合气中对 CO2 具有良好的选择性。此外,经过 20 次循环观察,该活性炭还具有极佳的可回收性(再生效率达 97%),而且二氧化碳吸附动力学最符合拉格伦伪二阶模型。这项研究表明,低活化温度(400 °C)、短 MW 活化时间(5 分钟)和低化学剂用量(KOH,0.72 M)可利用廉价而丰富的材料(PET 废料)生产出二氧化碳吸附剂,其二氧化碳吸附效果优于商业活性炭。
Towards low-cost and sustainable activated carbon production: Influence of microwave activation time on yield and CO2 uptake of PET-derived adsorbents
Microwave (MW) heating is proposed as a method to transform polyethylene terephthalate (PET) into porous adsorbents. The yield, textural properties, and CO2 uptake of the PET-derived adsorbents irradiated at different durations (3 – 35 min) at 400 °C were assessed. MW activation time influenced both the physical properties and CO2 uptake capacities of the resulting adsorbents. The yield decreased with activation time, but the surface area, total pore volume, micropore volume, and CO2 uptake capacities all increased with MW activation time before declining. The optimal sample (produced with 5 min of MW activation time) showed improved textural properties as well as higher equilibrium and dynamic CO2 uptakes than the commercial activated carbon used as reference. This adsorbent also possesses good selectivity for CO2 in the binary 10:90%vol/vol CO2: N2 mixture. Additionally, an excellent recyclability over 20 cycles, (Regeneration Efficiency > 97%) was observed, and the CO2 adsorption kinetics best fits Lagergren’s pseudo-second-order model. This study has shown that a low activation temperature (400 °C), a short MW activation time (5 min), and a low amount of chemical agent (KOH, 0.72 M) could produce CO2 adsorbents from a cheap and abundant material (PET-waste) with better CO2 uptake to that of a commercial activated carbon.
期刊介绍:
The Journal of CO2 Utilization offers a single, multi-disciplinary, scholarly platform for the exchange of novel research in the field of CO2 re-use for scientists and engineers in chemicals, fuels and materials.
The emphasis is on the dissemination of leading-edge research from basic science to the development of new processes, technologies and applications.
The Journal of CO2 Utilization publishes original peer-reviewed research papers, reviews, and short communications, including experimental and theoretical work, and analytical models and simulations.