Enhancement of the electrocatalytic oxidation of dyeing wastewater (reactive brilliant blue KN-R) over the Ce-modified Ti-PbO2 electrode with surface hydrophobicity

Highly Enhanced Photoelectrocatalytic Oxidation via Cooperative Effect of Neighboring Two Different Metal Oxides for Water Purification

“…It turned out that the oxygen evolution potential (OEP) of the Ti/SnO 2 -Sb@Bi 2 MoO 6 was higher than that of Ti/SnO 2 -Sb and Ti/Bi 2 MoO 6 (Figure b). Indicating that Bi 2 MoO 6 wrapped on Sb-doped SnO 2 nanosheets weakened the interaction between adsorbed species (such as ·OOH,·OH, and ·O) and resisted the secondary reaction . In a nutshell, higher oxygen evolution potential of Ti/SnO 2 -Sb@Bi 2 MoO 6 was favorable to organic removal by hydroxyl radicals .…”

“…It can be seen that both the Ti/SnO 2 -Sb electrode and the Ti/SnO 2 -Sb@Bi 2 MoO 6 electrode exhibit a very hydrophilic effect, which indicated that the introduction of Bi 2 MoO 6 does not change the hydrophilic properties of the electrode (Figure S7a1,a2,b1,b2). The hydrophilic electrode can increase the contact area with an electrolyte, enable fast redox reaction, and protect the inner structure of SnO 2 nanosheet arrays as a result of improving durability. , The 2D and 3D topography observation illustrated that the surface of the Ti/SnO 2 -Sb electrode possessed typical plains geomorphology (Figure S7a3–a5). After the introduction of Bi 2 MoO 6 , the electrode surface became rough (Figure S7b3–b5).…”

“…Note that the total electrode activity is judged by both the electrochemical surface area (ECSA) and the catalyst’s intrinsic activity. , According to previous reports, electrochemical surface area and the number of surface-active sites of electrode material can be appraised by voltammetric charge quantity ( q *) of each electrode sample. The voltammetric charges ( q *) are proportional to the electrochemical surface area, which can be calculated by integrating the cyclic voltammetric curve closed area. , Cyclic voltammograms of Sb-doped SnO 2 nanosheets before and after Bi 2 MoO 6 wrapped is shown in Figure a. The cyclic voltammogram results suggest that Ti/SnO 2 -Sb@Bi 2 MoO 6 had the highest number of active sites, which was expected to be determined by its structural features and composition, such as the structure of Bi 2 MoO 6 (the intercrossed nanosheets and these nanosheets were randomly stacked with multidimensional open channels).…”

“…Photoelectrocatalytic (PEC) oxidation technology that combines the advantages of photocatalytic (PC) oxidation and electrocatalytic (EC) oxidation has been becoming the focus of water pollution remediation . The exceedingly critical factor for the PEC is the selection of (photo) anode materials which possess excellent optical and electrocatalytic properties simultaneously. , Enormous efforts have been dedicated to evolving a wide range of alternative materials, including Pt, RuO 2 , , IrO 2 , PbO 2 , TiO 2 , SnO 2 , and boron-doped diamond (BDD) anodes. Among them, SnO 2 has attracted more attention owing to its stability, low cost, environmentally friendly, and high oxygen evolution overpotential, which have been demonstrated as a promising anode material for the oxidation of organic compounds .…”

Fabrication and photoelectrocatalytic performance of C3N4-modified Ti/PbO2 anode with surface hydrophobicity

“…Previous studies have shown that the suitable modification is favorable to enhance PbO 2 electrode's catalytic property, such as doping of non-metals or metal ions and compounding with certain materials [24][25][26]. Graphitized carbonitride (g-C 3 N 4 ) is known to be the most stable allotrope in carbon nitride.…”