Graduate Institute of Environmental Engineering, National Taiwan University , Taipei, Taiwan, Republic of China.
Central Region Campus, Industrial Technology Research Institute , Tainan, Taiwan, Republic of China.
J Air Waste Manag Assoc. 2020 Jun;70(6):616-628. doi: 10.1080/10962247.2020.1742247.
Beaded activated carbons (BACs) were derived from waste bamboo tar through carbonization (500°C for 2 hr) followed by physical activation using carbon dioxide (800-900°C for 2-4 hr). The adsorbent was examined for their physical and chemical properties, adsorption capacities toward methylethylketone (MEK) and toluene, and regenerabilities under microwave heating. It was found that the maximum total surface area reached for bamboo-tar-derived BAC after physical activation was 1364 m g, and more than 95% of the area was attributed to the microporous structures. Langmuir, Freundlich, and Dubinin-Radushkevich (D-R) isotherm models were applied to the adsorption isotherm fitting, and the minimum R for each model was 0.986, 0.915, and 0.943, respectively. The isosteric heats of adsorption calculated based on D-R parameters for methylethylketone and toluene were 44.04 to 51.50 and 45.88 to 73.27 KJ mol, respectively. They were slightly over the range of physisorption and increased with adsorbate loading, which might be related to the micropore filling mechanism. Microwave regeneration under 600 W of power output removed most of the adsorbate (>93.03%) within 8 min. The results of this study are intended to benefit future study on waste-derived adsorbent in environmental applications.
Recycling waste bamboo tar for the novel adsorbent preparation is shown feasible in this study. Beaded activated carbon (BAC) synthesized from this waste bamboo tar possessed a high specific surface area, which aided in the capturing of volatile organic compounds (VOCs). Three adsorption isotherms, Langmuir, Freundlich, Dubinin-Radushkevich (D-R) models can be applied in interpreting the experimental adsorption data, providing information on adsorption heat and possible adsorption mechanism. A potential microwave regeneration method for BAC is tested, showing high desorption efficiencies with minimum heel formation. These findings can provide a new pathway for waste bamboo tar management and VOC abatement using adsorbents.
珠状活性炭（BAC）由废竹焦油经碳化（500°C 2 小时）和二氧化碳物理活化（800-900°C 2-4 小时）制得。对吸附剂的物理化学性质、对甲乙酮（MEK）和甲苯的吸附能力以及微波加热下的再生能力进行了考察。结果表明，经物理活化后，竹焦油衍生 BAC 的最大总表面积达到 1364 m²，其中超过 95%的面积归因于微孔结构。朗缪尔、弗伦德利希和杜比宁-拉杜什科夫（D-R）等温模型用于吸附等温线拟合，每个模型的最小 R 值分别为 0.986、0.915 和 0.943。基于 D-R 参数计算的甲乙酮和甲苯吸附等焓分别为 44.04 至 51.50 和 45.88 至 73.27 KJ mol。它们略高于物理吸附范围，并随吸附质负荷的增加而增加，这可能与微孔填充机制有关。在 600 W 功率输出下进行微波再生，在 8 分钟内可去除大部分吸附质（>93.03%）。本研究的结果旨在为今后在环境应用中对废衍生吸附剂的研究提供参考。
本研究表明，从废竹焦油中回收制备新型吸附剂是可行的。由这种废竹焦油合成的珠状活性炭（BAC）具有较高的比表面积，有利于捕获挥发性有机化合物（VOCs）。朗缪尔、弗伦德利希、杜比宁-拉杜什科夫（D-R）三种吸附等温模型可用于解释实验吸附数据，提供吸附热和可能的吸附机制信息。对 BAC 的潜在微波再生方法进行了测试，显示出较高的解吸效率和最小的滞后形成。这些发现为利用吸附剂处理废竹焦油和减少 VOC 排放提供了新途径。
