TY - JOUR
T1 - Electrodeposited Palladium Nanoparticles Enhancing Atomic Hydrogen-Mediated Electrochemical Recovery of Antimony
AU - Wei, Feng
AU - Qiu, Xianhua
AU - Wang, Bo
AU - Lu, Sen
AU - Zhang, Liying
AU - Yi, Genping
AU - Feng, Yufa
AU - Nie, Jiawei
AU - Shao, Penghui
AU - Liu, Wenzong
AU - Yang, Liming
AU - Wang, Ai Jie
AU - Luo, Xubiao
N1 - Publisher Copyright:
© 2024 American Chemical Society.
PY - 2024/7
Y1 - 2024/7
N2 - Electro-generated atomic hydrogen (H*) emerges as a potent species for water contaminant remediation, yet its short life span and confinement to the electrode-solution interface have restricted its broader application. Herein, we investigated the efficacy of palladium nanoparticles loaded onto a carbon cloth (hereafter the Pd/CC) electrode in stabilizing surface atomic H* and enhancing its electroreduction performance against toxic antimonite Sb(III). In comparison to the CC electrode, the Pd/CC electrode exhibited a 0.4 V increase in the onset potential of H+ electroreduction and a 5.5-fold improvement in electrochemically active surface area. Additionally, the Sb(III) removal rate constant and metallic antimony (Sb0) formation on the Pd/CC electrode surface were increased by 2.2- and 5.1-fold, respectively. Quenching experiments showed a 20% reduction ratio of atomic H* to Sb(III) at −1.0 V vs Ag/AgCl. Moreover, in situ trapping combined with semiquantification via electron spin resonance indicated that ca. 89% of atomic H* participated in Sb(III) reduction. The exposed crystal surface of Pd nanoparticles increased the electron transport capacity and atomic H* coverage on the electrode surface, which provided a large number of reduction sites for the direct and indirect reductions of Sb(III). Furthermore, accumulated reduction products were easily recovered in dilute H2SO4, rendering the electrode reusable. This work offers a practical and innovative solution for remediating heavy-metal-polluted wastewater and simultaneously recovering metal resources.
AB - Electro-generated atomic hydrogen (H*) emerges as a potent species for water contaminant remediation, yet its short life span and confinement to the electrode-solution interface have restricted its broader application. Herein, we investigated the efficacy of palladium nanoparticles loaded onto a carbon cloth (hereafter the Pd/CC) electrode in stabilizing surface atomic H* and enhancing its electroreduction performance against toxic antimonite Sb(III). In comparison to the CC electrode, the Pd/CC electrode exhibited a 0.4 V increase in the onset potential of H+ electroreduction and a 5.5-fold improvement in electrochemically active surface area. Additionally, the Sb(III) removal rate constant and metallic antimony (Sb0) formation on the Pd/CC electrode surface were increased by 2.2- and 5.1-fold, respectively. Quenching experiments showed a 20% reduction ratio of atomic H* to Sb(III) at −1.0 V vs Ag/AgCl. Moreover, in situ trapping combined with semiquantification via electron spin resonance indicated that ca. 89% of atomic H* participated in Sb(III) reduction. The exposed crystal surface of Pd nanoparticles increased the electron transport capacity and atomic H* coverage on the electrode surface, which provided a large number of reduction sites for the direct and indirect reductions of Sb(III). Furthermore, accumulated reduction products were easily recovered in dilute H2SO4, rendering the electrode reusable. This work offers a practical and innovative solution for remediating heavy-metal-polluted wastewater and simultaneously recovering metal resources.
KW - antimony recovery
KW - antimony-containing wastewater
KW - electro-generated atomic hydrogen
KW - electrochemical reduction
KW - palladium nanoparticle
UR - http://www.scopus.com/inward/record.url?scp=85190831258&partnerID=8YFLogxK
U2 - 10.1021/acsestengg.4c00078
DO - 10.1021/acsestengg.4c00078
M3 - Journal article
AN - SCOPUS:85190831258
SN - 2690-0645
VL - 4
SP - 1668
EP - 1678
JO - ACS ES&T Engineering
JF - ACS ES&T Engineering
IS - 7
ER -