Combination of electrocoagulation and photocatalysis for hydrogen production and decolorization of tartrazine dyes using CuO-TiO2 nanotubes photocatalysts

Indonesian J. Sci. Technol

Pelawi

Ibadurrohman

et al. 2022

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.

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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

Indonesian J. Sci. Technol

Pelawi

Ibadurrohman

et al. 2022

“…The nanotube array morphology increases surface area and irradiation effectiveness and can suppress the recombination rate between electrons and holes [14]. Subsequently, a study by Pelawi et al [15] improved the performance of TiNTAs by depositing CuO as an electron trapper and providing a smaller energy band gap of the photocatalyst. In another study, adding Fe as a dopant was also tried, which gave an improved photocatalyst performance effect [16,17].…”

Section: Introductionmentioning

confidence: 99%

Performance of CdS/TNTAs Nanocomposite in Removing Ciprofloxacin and Hydrogen Production using Simultaneously Electrocoagulation-Photocatalysis Process

Sugihartini

Pratiwi

Bull. Chem. React. Eng. Catal.

2022

Self Cite

This study used CdS as a pair of TiO2 Nanotube Arrays (TNTAs), considering the position and width of the energy band gap, which is expected to increase photocatalyst performance. The nancomposite was synthesized using the successive ionic layer adsorption reaction (SILAR) method, with Cd(CH3COO)2 and Na2S as precursors. The CdS/TNTAs nanocomposite is expected to reduce the energy band gap to enable the visible and UV spectrum to activate the photocatalyst. Additionally, the formed heterojunction mechanism provides opportunities for the trajectories of electrons and holes to be farther apart and reduce the recombination rate. The degradation ability of CdS/TNTAs nanocomposite in the photocatalytic process was evaluated using samples of ciprofloxacin liquid waste as an antibiotic, which is quite challenging to decompose completely. The ability of the photocatalytic process to produce hydrogen gas was also observed and its performance synergized with the electrocoagulation process. The result showed that the use of CdS as a TNTAs partner in CdS/TNTAs nanocomposites affects increasing photocatalyst performance, both in degrading ciprofloxacin and producing hydrogen gas. Furthermore, the CdS/TNTAs nanocomposite increased the photocatalytic process’s ability to degrade ciprofloxacin and produce hydrogen from 8.5 to 20.5% and 6 to 23.5 mmol/m2 compared to using TNTAs alone. The processing capability is further enhanced when run in synergy with the electrocoagulation process where the removal of ciprofloxacin reaches 86.55% and the hydrogen produced is 2.62×106 mmol/m2. Copyright © 2022 by Authors, Published by BCREC Group. This is an open access article under the CC BY-SA License (https://creativecommons.org/licenses/by-sa/4.0).

“…For example, Farah et al 12 observed that the deposition of CuO on TiO 2 using the photo-assisted deposition (PAD) method could reduce the bandgap energy to 2.60 eV. Related to the photocatalytic activity, Pelawi et al 13 found that modification by TiO 2 with CuO dopant can degrade tartrazine solution of 10.5%. Moreover, other investigators found that deposited CuO on TiO 2 exhibit higher performance in decolorization of methylene blue rather than pure TiO 2 .…”

mentioning

confidence: 99%

“…Related to the photocatalytic activity, Pelawi et al. 13 found that modification by TiO 2 with CuO dopant can degrade tartrazine solution of 10.5%. Moreover, other investigators found that deposited CuO on TiO 2 exhibit higher performance in decolorization of methylene blue rather than pure TiO 2 .…”

mentioning

confidence: 99%

Modified anti-mosquito and self-cleaning fabrics utilizing clove oil–CuO/TiO₂ composites

Ibadurrohman

Kristianto

Textile Research Journal

2022

We report on the synthesis of CuO/TiO2 composites via a photo-assisted deposition method. The encapsulated clove oil was synthesized using oil-in-water emulsification. The optimum mass ratio of CuO:TiO2 was combined with encapsulated clove oil and then coated on fabric. The obtained CuO/TiO2 composites were examined using scanning electron microscopy to scrutinize their morphology and ultraviolet-visible diffuse reflectance spectra to identify the composites’ absorption range and bandgap energy. The modified fabrics were then characterized using Fourier-transform infrared spectroscopy. The results indicated that CuO/TiO2 samples possess spheroidal shapes, while the absorption spectra of CuO/TiO2 samples were red-shifted to the visible region as the CuO content increased. Photocatalytic activities of TiO2 and CuO/TiO2 were examined by degrading methylene blue under ultraviolet light, which shows that CuO-doped TiO2 exhibits higher activity than TiO2. The self-cleaning functionality of the modified fabrics was examined using sludge solution, revealing that the modified fabrics with CuO/TiO2 composites and encapsulated clove oil (CLO-CuO/TiO2) exhibit cleaner surfaces than blank fabric. The optimum capacity of the fabrics as repellents was obtained in a sample with the smallest average mosquitoes landing of four.