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Comprehending adsorption of methylethylketone and toluene and microwave regeneration effectiveness for beaded activated carbon derived from recycled waste bamboo tar.
Journal of the Air & Waste Management Association ( IF 2.7 ) Pub Date : 2020-06-04 , DOI: 10.1080/10962247.2020.1742247
Yu-Ting Chen,Ying-Pin Huang,Can Wang,Ji-Guang Deng,Hsing-Cheng Hsi

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 m2 g−1, 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 R2 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−1, 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.

Implications

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.



中文翻译:

理解甲基乙基酮和甲苯的吸附以及微波处理再生竹废焦油中的珠状活性炭的再生效果。

竹炭废料通过碳化(500°C,2小时),然后使用二氧化碳进行物理活化(800-900°C,2-4小时)而得到珠状活性炭。检查了吸附剂的物理和化学性质,对甲基乙基酮(MEK)和甲苯的吸附能力以及在微波加热下的可再生性。发现在物理活化之后,源自竹焦油的BAC达到的最大总表面积为1364m 2  g -1,并且超过95%的面积归因于微孔结构。将Langmuir,Freundlich和Dubinin-Radushkevich(DR)等温线模型应用于吸附等温线拟合,并且最小R 2每个模型分别为0.986、0.915和0.943。基于DR参数计算的甲基乙基酮和甲苯的等温吸附热分别为44.04至51.50和45.88至73.27 KJ mol -1。它们略高于物理吸附范围,并随吸附物负载量的增加而增加,这可能与微孔填充机理有关。在600 W的功率输出下进行微波再生,在8分钟内除去了大部分被吸附物(> 93.03%)。这项研究的结果旨在有益于将来在环境应用中对源自废物的吸附剂的研究。

含义

这项研究表明,回收废竹焦油制备新型吸附剂是可行的。由这种废竹节焦油合成的珠状活性炭(BAC)具有较高的比表面积,有助于捕获挥发性有机化合物(VOC)。可以使用三种吸附等温线Langmuir,Freundlich,Dubinin-Radushkevich(DR)模型来解释实验吸附数据,从而提供有关吸附热和可能的吸附机理的信息。测试了一种潜在的BAC微波再生方法,该方法显示了高解吸效率和最小的脚跟形成。这些发现可为使用吸附剂管理废竹焦油和减少VOC提供新途径。

更新日期:2020-06-04
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