Journal article
Electrically Controlled Anion Exchange Based on a Polypyrrole/Carbon Cloth Composite for the Removal of Perfluorooctanoic Acid
ACS ES&T water, Vol.1(12), pp.2504-2512
12/10/2021
Abstract
A simple and effective process for perfluorooctanoic acid (PFOA) removal using electrically switched ion exchange was developed by depositing polypyrrole (PPy) on the conductive material. As a conducting polymer, PPy can switch between the oxidized state (with positive surface charges) and the reduced state (without surface charges), which results in anion exchange upon application of an oxidation or reduction potential, making it a suitable adsorbent for PFOA, a challenging anionic organic contaminant in the natural aqueous environment. Adsorption mechanisms and the regeneration ability of the PPy were explored through adsorption and desorption tests in an electrochemical quartz crystal microbalance with dissipation monitoring (EQCMD) system and via batch experiments. In the batch experiments, carbon cloths coated with PPy were used as adsorbents, showing excellent selectivity of PFOA over common inorganic anionic species, such as Cl-, NO3-, and SO42-. More than 90% of adsorbed PFOA can be quickly released within 30 min via the electrically controlled desorption method. The results of X-ray photoelectron spectroscopy analysis provide direct evidence for the anion-exchange process, which happens between Cl- and PFOA during the redox switching of PPy. The results of this study show the possibility of a novel process for the removal of PFOA from contaminated water.
Metrics
1 Record Views
Details
- Title
- Electrically Controlled Anion Exchange Based on a Polypyrrole/Carbon Cloth Composite for the Removal of Perfluorooctanoic Acid
- Creators
- Yuhao Tian - Washington State UniversityJianyu Xing - Washington State UniversityChenxi Huyan - Washington State UniversityChengzhou Zhu - Washington State UniversityDan Du - Washington State UniversityWenlei Zhu - Washington State UniversityYuehe Lin - Washington State UniversityIndranil Chowdhury - Washington State University
- Publication Details
- ACS ES&T water, Vol.1(12), pp.2504-2512
- Academic Unit
- School of Mechanical and Materials Engineering
- Publisher
- Amer Chemical Soc
- Number of pages
- 9
- Grant note
- New Faculty Award Washington State University
- Identifiers
- 99901227638601842
- Language
- English
- Resource Type
- Journal article