TY - JOUR
T1 - A Bipolar CdS/Pd Photocatalytic Membrane for Selective Segregation of Reduction and Oxidation Processes
AU - Costantino, Federica
AU - Gavioli, Luca
AU - Kamat, Prashant V.
PY - 2022
Y1 - 2022
N2 - A photocatalytically active bipolar membrane consisting of a CdS photocatalyst
and Pd electrocatalyst has been constructed to carry out environmentally relevant oxidation and reduction processes. The ion exchange property of a bipolar membrane (BPM) has allowed us to load the CdS photocatalyst on one side and Pd electrocatalyst on the other side. By inserting the photocatalytic BPM-CdS/Pd membrane between the two compartments of an H-cell, we can separate the reduction and oxidation processes. Following visible light excitation of CdS in the BPM-CdS/Pd membrane, we can induce vectorial electron transfer from CdS to Pd and to an electron acceptor (4-nitrophenol). The holes generated at CdS are
scavenged by ethanol or 4-chlorophenol. The photocatalytic reduction rate dependence on the Pd loading in the membrane as well as its effect on modulating the rates of electron and hole transfer processes are discussed. The design of a semiconductor and metal loaded membrane paves the way for improving selectivity and efficiency of photocatalytic processes.
AB - A photocatalytically active bipolar membrane consisting of a CdS photocatalyst
and Pd electrocatalyst has been constructed to carry out environmentally relevant oxidation and reduction processes. The ion exchange property of a bipolar membrane (BPM) has allowed us to load the CdS photocatalyst on one side and Pd electrocatalyst on the other side. By inserting the photocatalytic BPM-CdS/Pd membrane between the two compartments of an H-cell, we can separate the reduction and oxidation processes. Following visible light excitation of CdS in the BPM-CdS/Pd membrane, we can induce vectorial electron transfer from CdS to Pd and to an electron acceptor (4-nitrophenol). The holes generated at CdS are
scavenged by ethanol or 4-chlorophenol. The photocatalytic reduction rate dependence on the Pd loading in the membrane as well as its effect on modulating the rates of electron and hole transfer processes are discussed. The design of a semiconductor and metal loaded membrane paves the way for improving selectivity and efficiency of photocatalytic processes.
KW - photocatalysis, bipolar membrane, electron transfer, CdS, palladium, environmental remediation
KW - photocatalysis, bipolar membrane, electron transfer, CdS, palladium, environmental remediation
UR - http://hdl.handle.net/10807/221324
UR - https://pubs.acs.org/doi/10.1021/acsphyschemau.1c00035
U2 - 10.1021/acsphyschemau.1c00035
DO - 10.1021/acsphyschemau.1c00035
M3 - Article
SN - 2694-2445
VL - 2
SP - 89
EP - 97
JO - ACS Physical Chemistry Au
JF - ACS Physical Chemistry Au
ER -