Carbon nanotube/Prussian blue nanocomposite film as a new electrode material for environmental treatment of water samples

Abstract

The use of carbon nanotube/Prussian blue nanocomposite film as a new electrode material for the environmental treatment of water samples is reported. The application of photochemical, electrochemical and photoelectrochemical-based Fenton processes were investigated for methyl orange dye degradation.The effect of the operating parameters, such as hydrogen peroxide concentration and applied potential, was established using factorial experimental design. Surface-contour plots revealed how the interaction of the parameters influenced the system response maximum. A methyl orange degradation of 98% was achieved at neutral pH, room temperature, small amount of catalyst, low overpotential (0.0 V vs. Ag/AgCl) and very low amount of H 2 O 2 (1.0 mmol L 21 ). Moreover, since the carbon nanotube/Prussian blue nanocomposite film is very stable and can be reused without a loss of catalytic activity, this new electrode material is shown to be applicable to wastewater treatment.

Design of a Prussian Blue Analogue/Carbon Nanotube Thin‐Film Nanocomposite: Tailored Precursor Preparation, Synthesis, Characterization, and Application

“…The PB is formed by a heterogeneous reaction between iron species encapsulated in CNTs and [Fe(CN) 6 ] 3− species in aqueous solution. By using filled CNTs as a reactant, PB is deposited directly over the CNT walls, thus generating a highly stable compound with great performance as a H 2 O 2 sensor, as electrochromic material, and as catalyst for water treatment . To demonstrate that this could be extended as a general route to prepare different PBA compounds, the synthesis of CNT/PBA films was recently adapted by simply changing the species in the aqueous solution: by switching [Fe(CN) 6 ] 3− for [Ru(CN) 6 ] 4− , the procedure generates nanocomposites between CNTs and the PBA known as ruthenium purple, [Fe 4 {Ru(CN) 6 } 3 ], thus also demonstrating great stability and performance as a sensor for H 2 O 2 and as electrochromic material.…”

Recent Developments in Electrochemical Technology for Water and Wastewater Treatments

“…The novel non-metal electrodes have received extreme attention due to their active sites and high specific surface area. Nossol et al [18] reported the effectiveness of carbon nanotube (CNT)/Prussian blue (PB) nanocomposite film for water treatment. The highest CE of 99% was reported for the Fig.…”

Electrochemical degradation of RB19 dye using low-frequency alternating current: effect of a square wave

“…This may be explained by the fact that dye molecules with an increasing concentration tend to associate with clusters of low diffusivity; this lowers the rate of dye diffusion to the electrode surface with a consequent decrease in the rate of dye oxidation. 31,32…”