Highly-Organized One-Dimensional Copper-Doped Titanium Dioxide Nanotubes for Photoelectrocatalytic Degradation of Acid Orange 52

2019 ◽  
Vol 801 ◽  
pp. 285-291 ◽  
Author(s):  
Edgar Clyde R. Lopez ◽  
Vince Aron F. Cleofe ◽  
Rio Ysabel A. Cañal ◽  
Kristoffer Francis P. Boado ◽  
Jem Valerie D. Perez
Keyword(s):  
Titanium Dioxide ◽  
Uv Light ◽  
Tube Length ◽  
Light Illumination ◽  
Order Kinetic ◽  
One Pot ◽  
Titanium Dioxide Nanotubes ◽  
Acid Orange ◽  
One Dimensional ◽  
Doped Titanium Dioxide

Highly-organized one-dimensional arrays of copper-doped titanium dioxide nanotubes (Cu-TiNTs) were synthesized in a one-pot approach by double anodization of titanium sheets. Field-emission scanning electron microscopy showed that Cu-TiNTs have an average inner diameter of 52.13 nm, a wall thickness of 14.28 nm, and a tube length of 0.6401 μm. Fourier-transform infrared spectroscopy confirmed the presence of characteristic O-Ti-O bond of TiO2. X-ray fluorescence spectroscopy confirmed copper-doping with an average dopant loading of 0.0248%. Even at this low dopant loading, Cu-TiNTs were shown to be photo-active in degrading Acid Orange 52 (AO 52) under UV light illumination. The kinetic profiles of AO 52 photoelectrochemical degradation were best described by the pseudo-first-order kinetic model (R2 ≥ 0.991) with kinetic constants 9.42 x 10-3 min-1 for Cu-TiNTs as compared to 6.04 x 10-3 min-1 for pristine TiNTs. Overall, doping pristine TiNTs with Cu was shown to enhance its photoelectrocatalytic properties in degrading textile dyes such as AO 52.

Photoelectrocatalytic Degradation of C.I. Basic Blue 9 under UV Light Using Silver-Doped Titanium Dioxide Nanotubes

2020 ◽  
Vol 831 ◽  
pp. 132-141
Author(s):  
Edgar Clyde R. Lopez ◽  
Vince Aron F. Cleofe ◽  
Rio Ysabel A. Cañal ◽  
Kristoffer Francis P. Boado ◽  
Jem Valerie D. Perez
Keyword(s):  
Titanium Dioxide ◽  
Uv Light ◽  
Low Cost ◽  
Degree Of Crystallinity ◽  
Order Kinetic ◽  
Light Spectrum ◽  
One Pot ◽  
Titanium Dioxide Nanotubes ◽  
Lattice Volume ◽  
Doped Titanium Dioxide

Titanium dioxide is a widely-investigated semiconductor photocatalyst due to its wide availability and low cost. Although it has been successfully used in the photocatalytic treatment of various organics in wastewater, it remains a challenge to modify its structure to achieve enhanced catalytic properties at a wider light spectrum. Doping with transition metals was seen to narrow its optical band gap yet synthesis routes have been largely limited to the use of high-end equipment. Herein we demonstrate the use of a simpler one-pot approach to synthesize nanoporous arrays of silver-doped titanium dioxide nanotubes (Ag-TiNTs) by double anodization of titanium sheets. The synthesized Ag-TiNTs have an average inner diameter of 58.68 nm and a wall thickness of 16.46 nm. ATR-FTIR spectroscopy revealed its characteristic peaks attributed to O-Ti-O bonds. Silver doping increased the lattice volume and crystallite size of anatase with a corresponding decrease in the degree of crystallinity due to the introduction of impurity Ag atoms in its tetragonal structure. Silver was homogeneously distributed across the nanotube surface at an average loading of 1.41 at. %. The synthesized Ag-TiNTs were shown to have a superior photoelectrocatalytic activity in degrading C.I. Basic Blue 9 under UV illumination with a pseudo-first-order kinetic rate of 1.0253 x 10-2 min-1. Most importantly, the Ag-TiNTs are photoelectrocatalytically-active even at a low Ag loading.

One-pot low-temperature synthesis of TiO2 nanowire/rGO composites with enhanced photocatalytic activity

RSC Advances ◽  
2016 ◽  
Vol 6 (96) ◽  
pp. 94092-94097 ◽  
Author(s):  
Huan Xing ◽  
Wei Wen ◽  
Jin-Ming Wu
Keyword(s):  
Photocatalytic Activity ◽  
Reaction Rate ◽  
Uv Light ◽  
Reaction Rate Constant ◽  
Light Illumination ◽  
Low Temperature Synthesis ◽  
Temperature Synthesis ◽  
One Pot ◽  
Tio2 Nanowire

In situ growth of TiO2 nanowires on graphene oxide was achieved at 80 °C in an open atmosphere. The optimized TiO2/rGO hybrid exhibited a reaction rate constant 5.5 times that of TiO2 nanowires towards photodegradations of rhodamine B in water under the UV light illumination.

scholarly journals Comparative study of P25/BiOCl mixtures as photocatalysts in Acid Orange 7 degradation

2021 ◽  
pp. 25-28
Author(s):  
Lorena MENDEZ-ALVARADO ◽  
Miguel A. RIVERA-FLORES ◽  
Miguel A. SANDOVAL ◽  
Rosalba FUENTES
Keyword(s):  
Solvothermal Method ◽  
Organic Dyes ◽  
Uv Light ◽  
Hierarchical Structures ◽  
Degradation Efficiency ◽  
Light Illumination ◽  
Acid Orange 7 ◽  
X Ray Diffraction ◽  
Acid Orange ◽  
X Ray

Objectives. Among strategies used to improve the photocatalytic properties of titanium dioxide (TiO2), coupled semiconductor has been widely studied. Bismuth oxychloride (BiOCl) semiconductor has been highlighted, specially, with hierarchical structures (3D), because it has been shown to have higher performance in the photodegradation of organic dyes in wastewater. Therefore, in this work the degradation efficiency of acid orange 7 (AO7) was studied using TiO2 (P25 Degussa), synthesized BiOCl with hierarchical structure, and mixtures of them as photocatalysts. Methodology. BiOCl was synthesized by the solvothermal method. The BiOCl was characterized by different techniques such as X-ray diffraction (XRD) and scanning electron microscopy (SEM). In addition, the pore distribution and the surface area were determined. Photocatalytic experiments were carried out with a photocatalyst dose of 1 g‧L-1, initial dye concentration of 50 mg‧L-1, and UV light illumination. Contribution. The interaction of P25 Degussa with BiOCl microspheres (75/25, respectively) improved the photocatalytic degradation achieving a 50% degradation efficiency.

Synthesis of Silver-Doped Titanium Dioxide Nanotubes by Single-Step Anodization for Enhanced Photodegradation of Acid Orange 52

2019 ◽  
Vol 950 ◽  
pp. 149-153
Author(s):  
Edgar Clyde R. Lopez ◽  
Joey D. Ocon ◽  
Jem Valerie D. Perez
Keyword(s):  
Single Step ◽  
High Definition ◽  
Top Down ◽  
Titanium Dioxide Nanotubes ◽  
Acid Orange ◽  
X Ray ◽  
Uv Illumination ◽  
Ordered Array ◽  
Inner Diameter ◽  
Doped Titanium Dioxide

Silver-doped TiO2 nanotubes (Ag-TiNTs) were synthesized in a top-down approach by single-step anodization of titanium sheets. The highly-ordered array of Ag-TiNTs was confirmed by scanning electron microscopy with an average inner diameter of 41.28 nm and a wall thickness of 35.38 nm. Infrared spectroscopy confirmed the presence of O-Ti-O bonds. Analysis of the X-ray powder diffraction profiles showed the characteristic peaks for anatase and titanium for both pristine TiNTs and Ag-TiNTs. Ag-doping caused no observed changes in the crystalline structure of pristine TiNTs. High-definition X-ray fluorescence spectroscopy revealed that the synthesized Ag-TiNTs have 0.05 wt% Ag-loading. Even at low Ag-loading, the Ag-TiNTs were shown to be photo-active, achieving 10.13% degradation of Acid Orange 52 under UV illumination after 120 min.

Fe/S Co-Doped Titanium Dioxide Nanotubes: Optimization of the Photoelectrocatalytic Degradation Kinetics of Phenol Red

2021 ◽  
Vol 891 ◽  
pp. 49-55
Author(s):  
Edgar Clyde R. Lopez ◽  
Nicole Elyse B. Saputil ◽  
Lance A. Loza ◽  
Fiona Fritz G. Camiguing ◽  
Marlon L. Mopon Jr. ◽  
...  
Keyword(s):  
Titanium Dioxide ◽  
Dye Degradation ◽  
Degradation Kinetics ◽  
Batch Reactor ◽  
Phenol Red ◽  
Titanium Dioxide Nanotubes ◽  
Photoelectrocatalytic Degradation ◽  
Cubic Model ◽  
Doped Titanium Dioxide ◽  
Optimized Conditions

Photoelectrocatalysis has emerged as a promising technology to degrade recalcitrant pollutants such as textile dyes in wastewater completely. Titanium dioxide is typically used as a photocatalyst, but its wide bandgap constrains its use to the use of ultraviolet light. To extend its use to the visible-light region, we doped titanium dioxide nanotubes with iron and sulfur. We used them as a photoelectrode for the photoelectrocatalytic degradation of a model pollutant – phenol red. Response surface methodology using a Box-Behnken design of experiments was used to investigate the effects of initial dye concentration, applied potential, and dopant loading on phenol red degradation kinetics. Statistical analysis showed that our reduced cubic model adequately correlates these parameters. The fastest dye degradation rate was achieved at the optimized conditions: initial phenol red concentration = 5.0326 mg L-1, applied voltage = 29.9686 V, and dopant loading = 1.2244 wt.%. Complete degradation of phenol red may be achieved after 11.77 hours of treatment under the optimized conditions in a batch reactor. Our model's robustness enables it to be used for process modeling and a basis for designing scaled-up photoelectrocatalytic reactors.

Sign in / Sign up

Export Citation Format

Share Document