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Selective Pb2+ removal and electrochemical regeneration of fresh and recycled FeOOH.
- Source :
- Nano Research; Jul2023, Vol. 16 Issue 7, p9352-9363, 12p
- Publication Year :
- 2023
-
Abstract
- Heavy metal pollution is a key environmental problem. Selectively extracting heavy metals could accomplish water purification and resource recycling simultaneously. Adsorption is a promising approach with a facile process, adaptability for the broad concentration of feed water, and high selectivity. However, the adsorption method faces challenges in synthesizing high-performance sorbents and regenerating adsorbents effectively. FeOOH is an environmentally friendly sorbent with low-cost production on a large scale. Nevertheless, the selectivity behavior and regeneration of FeOOH are seldom studied. Therefore, we investigated the selectivity of FeOOH in a mixed solution of Co<superscript>2+</superscript>, Ni<superscript>2+</superscript>, and Pb<superscript>2+</superscript> and proposed to enhance the capacity of FeOOH and regenerate it by using external charges. Without charge, the FeOOH electrode shows a Pb<superscript>2+</superscript> uptake capacity of 20 mg/g. After applying a voltage of −0.2/+0.8 V, the uptake capacity increases to a maximum of 42 mg/g and the desorption ratio is 70%–80%. In 35 cycles, FeOOH shows a superior selectivity towards Pb<superscript>2+</superscript> compared with Co<superscript>2+</superscript> and Ni<superscript>2+</superscript>, with a purity of 97% ± 3% in the extracts. The high selectivity is attributed to the lower activation energy for Pb<superscript>2+</superscript> sorption. The capacity retentions at the 5<superscript>th</superscript> and the 35<superscript>th</superscript> cycles are ca. 80% and ca. 50%, respectively, comparable to the chemical regeneration method. With industrially exhausted granular ferric hydroxide as the electrode material, the system exhibits a Pb<superscript>2+</superscript> uptake capacity of 37.4 mg/g with high selectivity. Our work demonstrates the feasibility of regenerating FeOOH by charge and provides a new approach for recycling and upcycling FeOOH sorbent. [ABSTRACT FROM AUTHOR]
- Subjects :
- HEAVY metal toxicology
FERRIC hydroxides
HEAVY metals
ACTIVATION energy
WATER supply
Subjects
Details
- Language :
- English
- ISSN :
- 19980124
- Volume :
- 16
- Issue :
- 7
- Database :
- Complementary Index
- Journal :
- Nano Research
- Publication Type :
- Academic Journal
- Accession number :
- 169750709
- Full Text :
- https://doi.org/10.1007/s12274-023-5569-2