The effects of surfactant in the sol–gel synthesis of CuO/TiO2 nanocomposites on its photocatalytic activities under UV-visible and visible light illuminations

Ravishankar, T. N.; Vaz, Maurício de Oliveira; Teixeira, Sérgio R.

doi:10.1039/c9nj05246a

Cited by 50 publications

(25 citation statements)

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“…Many researchers [33] reported that adding surfactant could maintain stable suspension of particles. The surfactants play steric dispersing agent roles, which can keep particles in small diameters.…”

Section: Effects Of Hpc Surfactantmentioning

confidence: 99%

“…The surfactants play steric dispersing agent roles, which can keep particles in small diameters. [33] The surfactant can adsorb on TiO 2 surface, change its zeta potential to provide stability of the sol, and avoid the aggregation of particles. Two kinds of HPC were used as surfactants in this study, one with viscosity of 6-10 cps, and the other with viscosity of 150-400 cps.…”

Section: Effects Of Hpc Surfactantmentioning

confidence: 99%

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Preparation of TiO2 Sols with High Solid Contents by Sol Gel Method

Lu¹,

Chen²

2021

IJBBMB

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Titanium oxide has been extensively used as a photocatalytic material because of its excellent UV light-responsive effect, high refractive index, and high chemical stability. TiO 2 in anatase phase for applications in optical or electronic devices and photocatalysis has generally been used in the form of a thin film. The aim of this study was to prepare a stable TiO 2 sol with high solid content. Therefore one can use less coating time to have a mono layer of TiO 2 film on the substrate. In this study, TiCl 4 was slowly added to the distilled water in an ice bath. Aqueous solution of sodium hydroxide was added to adjust the pH of the solution to between 8 and 12 to form titanium hydroxide gel. After aging for a period of time, the Ti(OH) 4 gel was filtered and sufficiently washed. The filtered cake was repulped in water. Hydrochloric acid, as a catalyst for polycondensation, was slowly added to the solution with stirring. After poly-condensation reaction and crystallization, a transparent suspended TiO 2 sol was formed. XRD results show that the crystalline phase was anatase. The suspended TiO 2 particles were rhombus primary particles with the major axis ca. 20 nm and the minor axis ca. 5 nm. The sample prepared at pH 8 had the largest BET surface area of 141 cm 3 /g among all samples. The best preparation condition to have the smallest TiO 2 particles are Ti: H = 1: 1 (atomic ratio), 10% solid content of TiO 2 , and hydroxypropyl cellulose with viscosity of 150-400 cps as a surfactant. The thin film was obtained by dip-coating the glass in TiO 2 sol. Since the sol had high solid content, the coating time became less. The dip-coating on glass was less than three times to have one monolayer TiO 2 . The transparent TiO 2 thin film had super-hydrophilicity after illumination by UV light.

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Section: Effects Of Hpc Surfactantmentioning

confidence: 99%

Section: Effects Of Hpc Surfactantmentioning

confidence: 99%

Preparation of TiO2 Sols with High Solid Contents by Sol Gel Method

Lu¹,

Chen²

2021

IJBBMB

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“…Ravishankar [ 72 ] et al. reported the effect of surfactants on the photocatalytic performance of CuO/TiO 2 heterojunction materials prepared by the sol–gel method.…”

Section: Synthesis Of Nanoscale Spherical Tio2mentioning

confidence: 99%

Progress on the nanoscale spherical TiO₂ photocatalysts: Mechanisms, synthesis and degradation applications

et al. 2020

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Titanium dioxide (TiO2) has the advantages of strong photocatalytic activity, non‐toxicity, and low cost, and so on. It has always occupied a dominant position in many photocatalytic materials, especially nanoscale spherical TiO2 has the characteristics of high specific surface area and pore‐volume, and so on. Therefore, Degussa P25, as a typical representative of the nanoscale spherical structure, is currently the only material produced on a large scale. According to the structure, nanoscale spherical TiO2 can be divided into three types: solid, core‐shell, and hollow spheres. However, there is still a lack of the latest review on the synthetic doping and application of nanoscale spherical TiO2. Therefore, we first describe the degradation mechanism of nanoscale spherical TiO2 and summarize the latest progress of its synthesis strategy in this review, including doping and other modification techniques, and finally introduce the application of nanoscale spherical TiO2 photocatalytic degradation of volatile organic compounds, dye wastewater, antibiotics, pesticides, and oily wastewater. Through this review, it is helpful for researchers to further understand the synthesis and application of nanoscale spherical TiO2, hoping to continuously improve the disadvantages and photocatalytic activity of nanoscale spherical TiO2, and promote the widespread application of nanoscale spherical TiO2 on an industrial scale.

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“…Recent progress on coupling the heterogeneous structure of TiO 2 with visible light sensitizers has been demonstrated as a promising approach to substantially improve the light harvesting ability of the TiO 2 template. Several binary visible-light sensitizers, such as Bi 2 O 3 , Cu 2 O, CuO, Fe 2 O 3 , CdS, and Bi 2 S 3 , have been adopted for coupling with TiO 2 templates to achieve improved photoactive performance [2][3][4][5][6][7][8]. Among these visible-light sensitizers, binary oxides provide a better, more suitable process and chemical compatibility for integration with TiO 2 templates in comparison with most sulfides.…”

Section: Introductionmentioning

confidence: 99%

Sputtering-Assisted Synthesis of Copper Oxide–Titanium Oxide Nanorods and Their Photoactive Performances

Liang

2022

Nanomaterials

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A TiO2 nanorod template was successfully decorated with a copper oxide layer with various crystallographic phases using sputtering and postannealing procedures. The crystallographic phase of the layer attached to the TiO2 was adjusted from a single Cu2O phase or dual Cu2O–CuO phase to a single CuO phase by changing the postannealing temperature from 200 °C to 400 °C. The decoration of the TiO2 (TC) with a copper oxide layer improved the light absorption and photoinduced charge separation abilities. These factors resulted in the composite nanorods demonstrating enhanced photoactivity compared to that of the pristine TiO2. The ternary phase composition of TC350 allowed it to achieve superior photoactive performance compared to the other composite nanorods. The possible Z-scheme carrier movement mechanism and the larger granular size of the attached layer of TC350 under irradiation accounted for the superior photocatalytic activity in the degradation of RhB dyes.

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The effects of surfactant in the sol–gel synthesis of CuO/TiO₂ nanocomposites on its photocatalytic activities under UV-visible and visible light illuminations

Abstract: Effective and low-cost CuO/TiO2 nanocomposites were prepared at room temperature by a surfactant-assisted sol–gel method for photocatalytic activities under UV-visible and visible light irradiations.

Cited by 50 publications

References 61 publications

Preparation of TiO<sub>2</sub> Sols with High Solid Contents by Sol Gel Method

Preparation of TiO<sub>2</sub> Sols with High Solid Contents by Sol Gel Method

Progress on the nanoscale spherical TiO₂ photocatalysts: Mechanisms, synthesis and degradation applications

Sputtering-Assisted Synthesis of Copper Oxide–Titanium Oxide Nanorods and Their Photoactive Performances

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The effects of surfactant in the sol–gel synthesis of CuO/TiO2 nanocomposites on its photocatalytic activities under UV-visible and visible light illuminations

Abstract: Effective and low-cost CuO/TiO2 nanocomposites were prepared at room temperature by a surfactant-assisted sol–gel method for photocatalytic activities under UV-visible and visible light irradiations.

Cited by 50 publications

References 61 publications

Preparation of TiO&lt;sub&gt;2&lt;/sub&gt; Sols with High Solid Contents by Sol Gel Method

Preparation of TiO&lt;sub&gt;2&lt;/sub&gt; Sols with High Solid Contents by Sol Gel Method

Progress on the nanoscale spherical TiO2 photocatalysts: Mechanisms, synthesis and degradation applications

Sputtering-Assisted Synthesis of Copper Oxide–Titanium Oxide Nanorods and Their Photoactive Performances

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Product

Resources

About

The effects of surfactant in the sol–gel synthesis of CuO/TiO₂ nanocomposites on its photocatalytic activities under UV-visible and visible light illuminations

Preparation of TiO<sub>2</sub> Sols with High Solid Contents by Sol Gel Method

Preparation of TiO<sub>2</sub> Sols with High Solid Contents by Sol Gel Method

Progress on the nanoscale spherical TiO₂ photocatalysts: Mechanisms, synthesis and degradation applications