Ultrafine palladium nanoparticles supported on 3D self-supported Ni foam for cathodic dechlorination of florfenicol

By Liming Yang, Zhenglin Chen, Dan Cui, Xubiao Luo, Bin Liang, Lixia Yang, Tianfu Liu, Aijie Wang, Shuai Luo. Chemical Engineering Journal, 2019

149 citations recorded by the source corpus.

Abstract Electrocatalytic hydrodechlorination is deemed as a promising environmental remediation technology for fast and effective detoxification of halogenated antibiotic pollutants. In this study, a novel nickel (Ni) foam electrode decorated by ultrafine palladium (Pd) nanoparticles (denoted as Pd@Ni-foam) was reported for electrocatalytic dechlorination of florfenicol (FLO, a typical antibiotic). The Pd@Ni-foam electrode was synthesized via a facile and simple spontaneous galvanic replacement of surface Ni atoms of Ni foam with Pd precursor. The obtained Pd@Ni-foam catalyst showed an excellent performance on electrochemical dechloridation of FLO. The dechloridation efficiency of FLO (20 mg L−1) reached 99.5% with the dechloridation rate as fast as 16.58 mg min−1 at cathode potential of –1.2 V (vs. saturated Ag/AgCl), which far prevailed over pure Ni foam (2.63 mg min−1) and commercial Pd/C (11.32 mg min−1). The reaction rate constant (0.044 min−1) of FLO dechloridation at Pd@Ni-foam electrode was 44 and 4.4 times higher than that of pure Ni-foam (0.001 min−1) and commercial Pd/C (0.010 min−1), respectively. The excellent electrocatalysis for FLO dechloridation of Pd@Ni-foam cathode is ascribed to the 3D self-supported Ni-foam frame for mass transfer enhancement and the formation of Pd-Ni micro-interfaces leading to the high utilization of atomic H*. Furthermore, the toxicity assessment showed that the antibacterial activity of FLO was complete elimination after electrocatalytic dechlorination process.

Subfields: Biomedical Engineering, Electrochemistry, Water Science and Technology

View Paper: https://www.semanticscholar.org/paper/627a7f74d3d468140cc8dcfc1d74ab75507dc6d4