Visible Light Photoelectrocatalytic Degradation of Rhodamine B Using Ti/TiO2-NiO Photoanode (original) (raw)

Visible light photoelectrocatalytic degradation of rhodamine B using a dye-sensitised TiO2 electrode

Chemical Papers, 2014

Titanium dioxide is a promising catalyst for application in the photodegradation of organic pollutants in water due to its powerful oxidising property and long-term photostability. This study presents the production of titanium dioxide using the sol-gel process, dye sensitisation of the TiO2 electrode, and the performance of that cell. Sensitisation of titanium dioxide was performed using a dye, i.e., Fe(II)-polypyridyl complexes. The photoelectrocatalytic degradation of rhodamine B (RB) using ITO/TiO2/dye as electrode was investigated via a series of potentials, from +1.0 V to −1.0 V, and at various pH and NaCl concentration values (ITO is indium tin oxide conductive glass). The photoelectrocatalytic degradation of RB was performed with a visible light lamp. The change in the absorbance of RB with various potentials indicated that the absorbance of RB in solution systems with the sensitised TiO2 electrodes decreased with increasing anodic potential bias. The degradation cell exhibi...

PHOTOELECTROCATALYTIC OXIDATION OF RHODAMINE B IN AQUEOUS SOLUTION USING Ti/TiO 2 MESH PHOTOELECTRODES

Journal of Environmental Science and Health, Part A, 2002

To further improve the photooxidation techniques for water and wastewater purification, a Ti/TiO 2 mesh electrode, was successfully prepared by anodizing Ti mesh in 0.5M H 2 SO 4 solution. The structural and surface morphology of the Ti/TiO 2 electrode was examined by Raman spectroscopy and scanning electronic microscopy (SEM) respectively. The examination results indicated that its structure and properties were affected by its growth rate in the anodization process, and anatase TiO 2 was dominant in its composition. The photocatalytic (PC) oxidation and photoelectrocatalytic (PEC) oxidation of rhodamine B in aqueous solution using the Ti/TiO 2 electrode were investigated and compared. The experimental results demonstrated that the PEC oxidation by applying an electrical bias between the Ti/TiO 2 electrode and Pt electrode could significantly enhance the degradation rate of rhodamine B compared with the PC oxidation. It was found that the best performance of PEC oxidation was achieved by applying the electrical bias of 0.6V. The mechanism of rhodamine B degradation in the PEC process was discussed by studying the changes of absorbance spectrum and proton nuclear magnetic resonance spectroscopy of rhodamine B during the PEC degradation. The experimental results illustrated that both de-ethylation and chromogen destruction of rhodamine B under UV-light irradiation in the PEC degradation took place simultaneously.

The promoted photoelectrocatalytic degradation of rhodamine B over TiO2 thin film under the half-wave pulsed direct current

Applied Catalysis B: Environmental, 2011

The photoelectrocatalytic (PEC) degradation of rhodamine B (RhB) over nanosized titanium dioxide (TiO 2) coated working electrode was investigated under the half-wave pulsed direct current (DC). It was found that the PEC degradation of RhB was greatly enhanced under the half-wave pulsed DC mode, compared to under the constant DC mode widely used in the photoelectrochemical cells. It was mostly ascribed to it that the electrons could be more efficiently conducted into the outer circuit under the half-wave pulsed DC, leading to the improved generation of the holes at the surface of TiO 2 working electrode and thereby promoting the PEC oxidation of RhB, relative to under the constant DC. We provide a simple and promising way to improve the photocatalytic oxidation of organic dyes over TiO 2 thin film.

Electrochemical monitoring of photoelectrocatalytic degradation of rhodamine B using TiO2 thin film modified graphite electrode

Journal of Solid State Electrochemistry, 2012

A novel electrode was prepared by forming TiO 2 thin films using a commercially available TiO 2 powder (Degussa P25) on graphite plates for water photoelectrocatalytic decontamination. In addition to, for the first time the photoelectrochemical degradation of 3,4-dichlorophenol was investigated. The effects of applied potential, pH, and initial 3,4-dichlorophenol concentration on the photoelectrocatalytic (PEC) degradation of 3,4-dichlorophenol using ultraviolet (UV) illuminated TiO 2 /graphite (TiO 2 /C) thin film electrode was examined and discussed. Also, direct photolysis (DP), electrochemical oxidation (EC), photocatalytic (PC) and photoelectrocatalytic (PEC) degradation of 3,4-dichlorophenol were compared. Results show that the best responses for PEC are obtained at applied potential 1.2 V versus reference electrode, pH 8.0 and initial 3,4-dichlorophenol concentration 6.7 mg L-1 .

Hydrothermal Synthesis, Characterization and Photocatalytic Activity of Nanosized TiO_2 Based Catalysts for Rhodamine B Degradation

Turkish Journal of Chemistry, 2007

Nanosize crystalline TiO2 and SiO2/TiO2 mixed oxide particles as a photocatalyst for rhodamine B dye (RB) degradation in aqueous media were synthesized by a hydrothermal process at 200 • C. They were characterized using XRD, SEM, FT-IR, UV/VIS and BET analysis. The effects of silica content on the crystallinity and photocatalytic activity of TiO2 were investigated. Photocatalytic activity of the nano-TiO2 was compared with that of SiO2/TiO2 mixed oxides at the same conditions for degradation of RB, and mixed oxide catalysts showed more effective catalytic activity than the TiO2. The results revealed that photodegradation of RB proceeds by pseudo-first-order reaction kinetics where the rate constant, k, for degradation of 30 mg/L RB using the catalyst with 0.05 SiO2/TiO2 mole ratio is 0.133 min −1 .

Electric-agitation-enhanced photodegradation of rhodamine B over planar photoelectrocatalytic devices using a TiO2 nanosized layer

Applied Catalysis B: Environmental, 2010

The photocatalytic (PC) and photoelectrocatalytic (PEC) degradations of liquid-phase rhodamine B (RhB) were investigated over titanium dioxide (TiO 2) coated patterned indium tin oxide (ITO) substrate, denoted as planar ITO/TiO 2 /ITO device. It is found that over planar ITO/TiO 2 /ITO device, the PEC degradation of RhB by a bias of 1.5 V is significantly increased than the PC degradation of RhB, mainly because the horizontal electric field can not only suppress the hole-electron recombination, but also act as an electric agitator to enhance the competitive adsorption of RhB onto the TiO 2 surface. The results show that the planar ITO/TiO 2 /ITO device is an alternative way to achieve efficient degradation of dyes with simple configuration.

NANO TUBE TITANIUM DIOXIDE / TITANIUM ELECTRODE FABRICATION WITH NITROGEN AND SILVER METAL DOPED ANODIZING METHOD: PERFORMANCE TEST OF ORGANIC COMPOUND RHODAMINE B DEGRADATION Original Article

International Journal of Pharmacy and Pharmaceutical Sciences, 2015

Objective: The objective of this study was to prepare the titanium dioxide (TiO2) by using Anodizing method that was subsequently coated with nitrogen (N) and silver metal (Ag) in the TiO2/Ti matrix. Methods: The preparation of N-TiO2/Ti using the sol-gel method was carried out by adding 3 ml of 5M NH4Cl as the source of nitrogen with a dipcoating technique. Ag@TiO2/Ti was prepared using an electrodeposition method with 0.1M AgNO3 solution in 0.5% EDTA as the source of Ag metal dopants for one minute. Results: Photocurrent response test using the Linear Sweep Voltametry (LSV) showed that the TiO2/Ti electrode becomes active when irradiated UV light, while the addition of dopants makes nonmetal (N-TiO2/Ti) and metal (Ag@TiO2/Ti) active in visible or UV light irradiation. The analysis of Rhodamine B organic compound degradation by using UV-Vis spectrophotometer showed that the TiO2/Ti electrode was active in UV light irradiation at degradation rate 0.09 min-1 , while N-TiO2/Ti and Ag@TiO2/Ti were active in visible light irradiation at degradation rate 0.0372 min-1 and 0.0732 min-1 , respectively. Conclusion: The photoelectrocatalytic activity test to degrade organic compound of Rhodamine B showed that N-TiO2/Ti and Ag@TiO2/Ti electrode were able to be active in visible light.

Study on kinetic of UV and solar assisted photocatalytic degradation of rhodamine B by TiO2 nanostructure layer

Materials Technology: Advanced Performance Materials, 2012

Water and energy crisis are two problems that need to attend in the next decay. Lack of adequate fresh water throughout the world special in regions with scarcity of water will affect the social manner. This paper discusses on the life cycle assessment for retrofitting the photocatalytic technology as an alternative waste water treatment. The effect and kinetic of UV and solar irradiation on photocatalytic dynamic reactor using TiO 2-P25 (Degussa) were investigated for removal of rhodamine B (RhB) dye chosen as organic pollutant. The degradation kinetic of RhB is discussed in terms of Longmire model. The results showed that UV irradiation was more efficient than solar irradiation to degrade the RhB dye. The effect of temperature on performance of photo reactor was monitored in 15, 25 and 50uC. The photocatalytic reactor degraded the RhB in warm conditions better than the cool conditions.

Hydrothermal modification of zinc oxide and titanium dioxide for photocatalytic degradation of Rhodamine B

INTERNATIONAL SYMPOSIUM ON GREEN AND SUSTAINABLE TECHNOLOGY (ISGST2019)

Zinc oxide (ZnO) and titanium dioxide (TiO2) powders were hydrothermally modified in 10 M sodium hydroxide solutions at 120 °C for 24 hours to alter its morphologies. Hydrothermally treated ZnO and TiO2 showed partially rod-shaped particles and used as catalysts in the photocatalytic degradation of Rhodamine B under UV illumination. The effect of operational parameters on degradation efficiency such as catalyst loading (0.5 g/L to 2.5 g/L), initial dye concentration (2.5 ppm to 12.5 ppm), initial H2O2 concentration (0.1 M to 4.0 M) and solution pH (3 to 11) were studied. ZnO showed better photocatalytic activity as compared to TiO2 because ZnO has a lower bandgap energy and more active electron-hole pairs formation in the system. The optimum conditions were 0.5 M H2O2, 1.5 g/L ZnO suspension and 7.5 ppm Rhodamine B at neutral solution pH. The degradation of Rhodamine B followed pseudo first order reaction, with the apparent rate of reaction, kapp = 0.0501 min-1. An effective, efficient and environmental friendly method to remove organic dye from wastewater was developed and could be implemented in treating various types of organic pollutants.

Synthesis of TiO2 Photoelectrode Nanostructures for Sensing and Removing Textile Compounds Rhodamine B

Biointerface Research in Applied Chemistry, 2021

The study of the sensing and removal of Rhodamine B (RhB) textile compounds is the photoelectrocatalytic system applications development. RhB was used as a model to study the performance of TiO2 (NTiO2) photoelectrode nanostructures as environmentally friendly sensors. The synthesis of NTiO2 was carried out on the surface of the Titanium electrode by applying a potential bias of 25.0 V. The NTiO2 formed on the surface of the Titanium electrode (NTiO2/Ti) was characterized using SEM, XRD, FTIR, and Cyclic Voltammetry (CV). The formation of NTiO2 is characterized by the formation of a honeycomb-like tube on the Ti electrode surface. In addition, it is strengthened by diffractogram peaks at 2ϴ = 25 o and 48 o and IR absorption at wavenumbers of 3441.01 cm-1 (-OH groups) and 1629.85 cm-1 (Ti-O group). As for the results of sensing RhB using CV, it is known that RhB is oxidized on the surface of NTiO2/Ti with a value of Ea = 1.54 V. The oxidation process that occurs is controlled by the ...