CINTECX, Universidade de Vigo, Grupo de Bioingeniería y Procesos Sostenibles, Departamento de Ingeniería Química, Campus Lagoas-Marcosende, 36310, Vigo, Spain.
CINTECX, Universidade de Vigo, Grupo de Bioingeniería y Procesos Sostenibles, Departamento de Ingeniería Química, Campus Lagoas-Marcosende, 36310, Vigo, Spain.
Chemosphere. 2021 Oct;280:130778. doi: 10.1016/j.chemosphere.2021.130778. Epub 2021 May 16.
In this study, adsorption of a non-steroidal anti-inflammatory drug such as Diclofenac (DCF) on a commercial carbonaceous aerogel honeycomb monolith (NANOLIT®-NQ40) was ascertained. Based on, the overall design of an adsorption treatment should include a feasible regeneration process for the spent adsorbent. In this work, the adsorption/desorption process was ameliorated by coupling of electrochemical technology (anodic/cathodic polarisation). It was determined that the anodic polarisation enhanced the DCF removal and it was related with the applied voltage and the disposition of the electrodes into the bulk solution. Anodic polarisation at optimal conditions (voltage 0.9 V, electrodes gap 2.5 cm and electrolyte concentration higher than 1 mM) provoked an enhancement (around 30%) in the DCF adsorption rate. The spent aerogel regeneration method for the adsorbed or electro-adsorbed DCF was investigated and cathodic polarisation proved to be a viable regeneration alternative attaining the total regeneration of aerogel. The electro-desorption mechanism seemed to be linked to the generation of repulsive intermolecular forces in the aerogel surface. Finally, the sequential electro-adsorption/electro-desorption process was performed in successive cycles. The results confirmed the feasibility of this strategy, maintaining the efficiency with no structural changes in the monolith after several cycles being the electro-reversible adsorption of pollutants on aerogel a promising technology for the removal of pharmaceuticals from wastewater.
在这项研究中，确定了一种商业碳质气凝胶蜂窝整体式（NANOLIT®-NQ40）对非甾体抗炎药（如双氯芬酸（DCF））的吸附作用。根据吸附处理的总体设计，应该包括对用过的吸附剂进行可行的再生过程。在这项工作中，通过电化学技术（阳极/阴极极化）的耦合来改善吸附/解吸过程。结果表明，阳极极化增强了 DCF 的去除，这与施加的电压和电极在体相溶液中的布置有关。在最佳条件（电压 0.9 V、电极间隙 2.5 cm 和电解质浓度高于 1 mM）下进行阳极极化会使 DCF 的吸附速率提高约 30%。对吸附或电吸附的 DCF 的用过的气凝胶的再生方法进行了研究，结果表明阴极极化是一种可行的再生替代方法，可以实现气凝胶的完全再生。电脱附机理似乎与气凝胶表面生成的排斥分子间力有关。最后，在连续的循环中进行了顺序电吸附/电脱附过程。结果证实了这种策略的可行性，在经过几个循环后，整体式结构没有发生变化，仍保持着效率，这表明污染物在气凝胶上的电可逆吸附是从废水中去除药物的一种很有前途的技术。
