RT Journal Article
T1 Electro-reversible adsorption as a versatile tool for the removal of diclofenac from wastewater
A1 Puga Pazo, Antón
A1 Pazos Currás, Marta María
A1 Rosales Villanueva, Emilio
A1 Sanromán Braga, María Ángeles
K1 3303.09 Operaciones Electroquímicas
AB 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.
PB Chemosphere
SN 00456535
YR 2021
FD 2021-10
LK http://hdl.handle.net/11093/2283
UL http://hdl.handle.net/11093/2283
LA eng
NO Chemosphere, 280: 130778 (2021)
NO Financiado para publicación en acceso aberto: Universidade de Vigo/CISUG
NO Agencia Estatal de Investigación | Ref. CTM 2017-87326-R
DS Investigo
RD 29-nov-2023