Abstract
Heavy metals widely exist in wastewater, which is a serious threat to human health or water environment. Highly efficient removal of heavy metal ions from wastewater is a major challenge to wastewater treatment. In this work, capacitive removal of heavy metal ions from wastewater via an electro-adsorption and electro-reaction coupling process was originally demonstrated. The removal efficiency of heavy metal ions in the binary-component solutions containing metal nitrate (10 mg/L) and NaCl (100 mg/L) can reach 99%. Even the removal efficiency of heavy metal ions can be close to 99% in the multi-component solution containing all the seven metal nitrates (10 mg/L for each) and 100 mg/L NaCl. Meanwhile, the electro-adsorption and electro-reaction coupling process maintained excellent regeneration ability even after 20 cycles. Furthermore, the heavy metal ions removal mechanism was proven to be the pseudocapacitive intercalation of heavy metal ions into the layered structure of the employed W18O49/graphene in the electro-adsorption and electro-reaction coupling process. This work demonstrates great potential for general applicability to wastewater treatment.
| Original language | English |
|---|---|
| Pages (from-to) | 3333-3340 |
| Number of pages | 8 |
| Journal | Environmental Science and Technology |
| Volume | 55 |
| Issue number | 5 |
| Early online date | 19 Feb 2021 |
| DOIs | |
| Publication status | Published - 2 Mar 2021 |
ASJC Scopus subject areas
- Chemistry(all)
- Environmental Chemistry
Access to Document
- Revised-Manuscript
This document is the Accepted Manuscript version of a Published Work that appeared in final form in Environ. Sci. Technol., copyright © American Chemical Society after peer review and technical editing by the publisher. To access the final edited and published work see https://pubs.acs.org/doi/10.1021/acs.est.0c07849