Hierarchical mesoscale assembly of PbO₂on 3D titanium felt/TiO₂nanotubular array electrode for anodic decolourisation of RB-5 dye

Abstract

Hierarchical PbO 2 nanoparticles (NPs) were grown by hydrothermal method on TiO 2 nanotubes (NTs) at 3D titanium felt, which is simple and scalable method. TiO 2 NTs were formed on titanium felt by anodising at 25°C in environmentally friendly methanesulphonic acid solution. The growth of PbO 2 on the TiO 2 NTs depended on immersion time during hydrothermal synthesis and followed a LaMer-Dinegar burst kinetic model of nucleation and growth. PbO 2 formation began with rapid nucleation, followed by mesoscale assembly due to organic capping of poly(vinylpyrrolidinone). The electrochemical performance of 3D electrode was recorded in pH 3 sodium sulphate solutions containing Reactive Black 5 (RB-5) azo dye at 25°C. The resulting hierarchical 3D electrode achieved 98% decolourisation after 50 min of anodic oxidation with a first order batch decay rate of 0.0875 min −1 .

A PEDOT-Pt-TiO2 hybrid material synthesized by the casting method for photocatalytic hydrogen generation

“…TiO 2 nanotubes (TiO 2 NTs) are nanotubular structures that are commonly modified by polymeric materials [6]. They have been utilised in medicine [7], water and air treatment [8], electronic devices [9,10], lithium-ion batteries [11][12][13], sensors [14,15], and solar cells [16][17][18]. Hierarchical TiO 2 NTs obtained via anodic oxidation are used as scaffolds for polymeric materials [18][19][20][21].…”