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Environmentally Friendly in Situ Regeneration of Graphene Aerogel as a Model Conductive Adsorbent
Environmental Science & Technology ( IF 10.8 ) Pub Date : 2017-12-29 00:00:00 , DOI: 10.1021/acs.est.7b02795 Meilan Pan 1 , Chao Shan , Xiaolin Zhang , Yanyang Zhang , Chanyuan Zhu , Guandao Gao , Bingcai Pan
Environmental Science & Technology ( IF 10.8 ) Pub Date : 2017-12-29 00:00:00 , DOI: 10.1021/acs.est.7b02795 Meilan Pan 1 , Chao Shan , Xiaolin Zhang , Yanyang Zhang , Chanyuan Zhu , Guandao Gao , Bingcai Pan
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Adsorption is a classical process widely used in industry and environmental protection, and the regeneration of exhausted adsorbents, as the reverse process of adsorption, is vital to achieving a sustainable adsorption process. Chemical and thermal regeneration, which feature high costs and environmental side effects, are classical but not environmentally friendly methods. Herein, a new regeneration method based on an electrochemical process using graphene aerogel (GA) as a model conductive adsorbent was proposed. First, 3D GA was prepared to adsorb organic and inorganic pollutants, avoiding the inconvenience of using powdered graphene. Then, the exhausted GA was cleaned by the electrochemical desorption and degradation of adsorbed organic pollutants if undesired and the electrorepulsion of adsorbed metal ions in the absence of any additional chemicals, showing a high processing capability of 1.21 L g–1 GA h–1 and low energy consumption (∼0.2 kWh m–3 solution). The mechanisms involved in the electrochemistry-induced desorption process cover a decline in the GA adsorption performance depended on the electrochemically adjustable surface charge conditions, and the further repulsion and migration of adsorbates is subject to the strong in situ electric field. This work has important implications for the development of environmentally friendly regeneration processes and qualified adsorbents as well as the application of a green and efficient regeneration concept for traditional adsorption processes.
中文翻译：
石墨烯气凝胶作为模型导电吸附剂的环保原位再生
吸附是工业和环境保护中广泛使用的经典过程，作为吸附的逆过程，废吸附剂的再生对于实现可持续的吸附过程至关重要。具有高成本和环境副作用的化学和热再生是经典方法，但不是环境友好的方法。在此，提出了一种新的基于石墨烯气凝胶（GA）作为模型导电吸附剂的电化学方法再生方法。首先，准备了3D GA来吸附有机和无机污染物，从而避免了使用粉末状石墨烯带来的不便。然后，–1 GA h –1和低能耗（〜0.2 kWh m –3解决方案）。电化学诱导的解吸过程涉及的机理包括，GA吸附性能的下降取决于电化学可调节的表面电荷条件，并且被吸附物的进一步排斥和迁移会受到强烈的原位电场的影响。这项工作对开发环保型再生工艺和合格的吸附剂以及将绿色高效再生概念应用于传统吸附工艺具有重要意义。
更新日期：2017-12-31
中文翻译：
石墨烯气凝胶作为模型导电吸附剂的环保原位再生
吸附是工业和环境保护中广泛使用的经典过程，作为吸附的逆过程，废吸附剂的再生对于实现可持续的吸附过程至关重要。具有高成本和环境副作用的化学和热再生是经典方法，但不是环境友好的方法。在此，提出了一种新的基于石墨烯气凝胶（GA）作为模型导电吸附剂的电化学方法再生方法。首先，准备了3D GA来吸附有机和无机污染物，从而避免了使用粉末状石墨烯带来的不便。然后，–1 GA h –1和低能耗（〜0.2 kWh m –3解决方案）。电化学诱导的解吸过程涉及的机理包括，GA吸附性能的下降取决于电化学可调节的表面电荷条件，并且被吸附物的进一步排斥和迁移会受到强烈的原位电场的影响。这项工作对开发环保型再生工艺和合格的吸附剂以及将绿色高效再生概念应用于传统吸附工艺具有重要意义。
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