Simultaneous Decolorization of Tartrazine and Production of H2 in a Combined Electrocoagulation and Photocatalytic Processes using CuO-TiO2 Nanotube Arrays: Literature Review and Experiment

Abstract

We reported the simultaneous decolorization of tartrazine and H2 production via electrocoagulation and photocatalysis using CuO-doped TiO2 nanotube arrays (TNTA) composites. Tartrazine was removed by the combination of adsorption, electrocoagulation, and photocatalytic degradation, while H2 was produced through water reduction at the cathode and water splitting process on the photocatalyst surface. The photoreactor contains CuO-TNTA as a photocatalyst and is equipped with an 80-W UV lamp. Deposition of CuO on TNTA was conducted using a successive ionic layer adsorption and reaction (SILAR) method. The nanotubular of the TNTA as well as the distribution of CuO were evaluated employing FESEM and HRTEM. XRD patterns confirmed weak diffraction of CuO and TNTA revealing an anatase crystallite phase. The band gap of the CuO-TNTA was also found to be redshifted from that of pure TNTA. The simultaneous processes with the combined systems (20 V, pH = 11) managed to remove 80% of tartrazine while producing a high H2 yield (1.84 mmol), significantly higher than those obtained by each process.

Calcium Oxide Nanoparticle Production and its Application as Photocatalyst

“…Finally, above results showed additional information for the use of photocatalyst for being used as an alternative way for solving waste water. This is in line with current research [67][68][69].…”

Utilization of glycerol solution for hydrogen production by a combination of photocatalysis and electrolysis processes with Fe-TiO2 nanotubes

“…The procedures for interpreting and calculating the average tube inner diameter and tube wall of TiNTA have been explained in previous paper [27,28]. The average tube inner diameter of all photocatalyst samples ranged between 221 and 303 nm; meanwhile, the average tube wall thickness was between 27 and 37 nm (Table 2).…”

“…The average tube inner diameter of all photocatalyst samples ranged between 221 and 303 nm; meanwhile, the average tube wall thickness was between 27 and 37 nm (Table 2). It is reported that the mixing process and water content during anodization may affect the final size and nanotubular structure of TiNTAs [27]. This phenomenon occurs because there is a competition between the dissolution of TiO2 into the electrolyte solution at the top of the tube and the formation of TiO2 in the bottom tube during anodization.…”