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On the capture of ultralow-level benzene in indoor environments: Experiments, modeling and molecular simulation
Separation and Purification Technology ( IF 8.6 ) Pub Date : 2020-06-26 , DOI: 10.1016/j.seppur.2020.117306
Dingchao Zhang , Junjie Liu , Meng Liu , Lumeng Liu , D.D. Do

Benzene is one of the major indoor air pollutants, according to the World Health Organization (WHO), and understanding its adsorption and the difference between the adsorption behavior of benzene and water are essential in developing high-performance, water-resistant adsorbents. This paper presents a comprehensive study of benzene adsorption in carbon nano-porous materials by combining high-resolution measurement, modeling and molecular simulation. High-resolution isotherms and isosteric heats of benzene adsorption in two materials, microporous activated carbon fiber (ACF) and micro-mesoporous CMK-3 were provided. It is found that CMK-3 has higher specific adsorption capacity than ACF at very low pressures (<10−3 P/P0), making it a promising adsorbent for benzene capture in indoor environments. The Dubinin – Radushkevich model were used to fit the isotherms over the low-pressure regions. Furthermore, the experimental isotherm and the isosteric heat were analyzed with molecular simulation results, and the emphasis is placed on the behavior at ultralow pressures of benzene, typically found in indoor environments. Suggestion on the evaluation and management of adsorbents in terms of minimizing the impacts of ambient moisture were provided.



中文翻译:

关于室内环境中超低含量苯的捕获:实验,建模和分子模拟

根据世界卫生组织(WHO)的数据,苯是主要的室内空气污染物之一,了解苯的吸附以及苯和水的吸附行为之间的差异对于开发高性能,防水吸附剂至关重要。本文结合高分辨率测量,建模和分子模拟,对碳纳米多孔材料中苯的吸附进行了全面的研究。提供了两种材料(微孔活性炭纤维(ACF)和微介孔CMK-3)中苯吸附的高分辨率等温线和等温线。发现在非常低的压力下(<10 -3 P / P 0,CMK-3具有比ACF高的比吸附能力)),使其成为在室内环境中捕获苯的有希望的吸附剂。Dubinin – Radushkevich模型用于拟合低压区域的等温线。此外,利用分子模拟结果分析了实验等温线和等排热,重点放在了通常在室内环境中发现的超低苯压力下的行为。提供了关于评估和管理吸附剂的建议,以最大程度地减少环境水分的影响。

更新日期:2020-07-03
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