Titanium dioxide as a photocatalyst to create self-cleaning concrete

Dikkar, Hansaraj; Kapre, Varad; Diwan, Amey; Sekar, Suresh Kumar Rajamani

doi:10.1016/j.matpr.2020.10.948

Cited by 17 publications

(7 citation statements)

References 2 publications

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“…Photocatalytic concrete is made by adding photocatalysts in several ways, including direct addition when mixing concrete constituent materials, using concrete constituent materials that have been added photocatalysts or by spraying photocatalyst liquid on the concrete surface. Several studies have proven that the addition of photocatalysts allows concrete to clean itself and decompose contaminants containing NO x , SO 2 , and others through photocatalyst reactions [5,[16][17][18][19].…”

Section: Photocatalytic Concretementioning

confidence: 99%

“…One way that can be taken by the construction sector to overcome pollutants is to create selfcleaning concrete or concrete with photocatalyst added [5,6]. One photocatalyst that has been widely used is TiO 2 [7,8]. Both laboratories and fields that have conducted experiments, revealed that the addition of TiO 2 to pavement surfaces and building materials can significantly reduce air pollution and is self-cleaning [9].…”

Section: Introductionmentioning

confidence: 99%

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Photocatalytic Concrete Using ZnO and Al₂O₃ - A Review

Putri,

Pratama

2023

E3S Web Conf.

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Photocatalytic concrete is one of the innovations in the construction sector that environmentally friendly. Photocatalytic concrete can be decomposing harmful pollutants such as nitrogen oxides (NOx) and SO2. In its application, a widely used photocatalyst is TiO2. In fact, the use of TiO2 has several disadvantages, which is less efficient because the separation of TiO2 photocatalysts is very difficult and requires greater energy. In addition, the wide band-gap energy of TiO2 makes only a fraction of the ultraviolet (UV) fraction of sunlight usable. This study aims to analyse photocatalysts that are more usable in large quantities and easy to apply. Based on research that has been done, the use of ZnO and Al2O3 as photocatalysts replaces the use of TiO2 which has been used effectively to do. In addition to its simpler use, and its abundant availability, Al2O3 and ZnO can break down pollutants well.

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Section: Photocatalytic Concretementioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Photocatalytic Concrete Using ZnO and Al₂O₃ - A Review

Putri,

Pratama

2023

E3S Web Conf.

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“…The super-hydrophilic behavior of the TiO2 surface is maintained for around two days if the illumination is interrupted. Furthermore, titanium dioxide exposed to UV light creates potent agents capable of oxidizing and decomposing a wide variety of microorganisms, organic compounds, and inorganic substances [25].…”

Section: Contact Angle Measurementmentioning

confidence: 99%

The Combined Effect of Bubble and Photo Catalysis Technology in BTEX Removal from Produced Water

Al-Nuaim

Alwasiti

Shnain

et al. 2022

Bull. Chem. React. Eng. Catal.

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Among the several ways used in wastewater treatment, the photocatalysis process is a more novel and alternative process that is increasingly employed in recent years. This work aims to improve the performance of the photocatalyst process by using air bubbles in removing the BTEX from produced water as an indicator of process efficiency. The study also shows the effect of influencing factors (pH and residence time) on the photocatalysis process. The study was done in a rectangular column with dimensions of 200 mm width, 30 mm depth, and 1500 mm height. Commercial titanium oxide (TiO2) coated on a plate by the varnish was used as a source of the photocatalyst. The experiment was carried out under different values of gas flow rate (0-3 L/min) to evaluate its effect on the photocatalyst process, the effect of other variables of pH (3-11), and irradiation time (30-120) min was also studied. A new method of the coating was adopted by using an alumina plate with varnish as an adhesive. The characteristics results show that the coated plate has hydrophilic properties and that there is no significant change in the crystal structure of the TiO2 nanoparticles and the varnish before and after 60 h of the photocatalytic process, indicating that the plate is still effective after 60 h usage under different conditions. The results also show that the introduction of air bubbles enhances the removal efficiency of BTEX significantly and the best removal effectiveness of BTEX was 93% when pH = 5 after 90 min and 90% when pH = 3 after 120 min. The removal rate also reached 86% when pH = 7 after 120 min all at a flow rate of 3 L/min. The percentage of removal decreased at pH = 9 and 11, reaching 64% and 50%, respectively after 120 min and a flow rate of 3 L/min. 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).

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“…For this reason, it is widely used in biomedical research but also in environmental applications, e.g., as a catalyst in air or water purification [24][25][26][27][28]. It is also used in self-cleaning surfaces, in CO 2 reduction [29,30], in H 2 generation [31], and in the catalytic decomposition of harmful organic compounds [32][33][34][35]. The development of nanomaterials has allowed for the improvement of their properties, including the increase in the absorbing material's band gap in the ultraviolet range.…”

Section: Introductionmentioning

confidence: 99%

Enhancing Visible-Light Photocatalysis with Pd(II) Porphyrin-Based TiO2 Hybrid Nanomaterials: Preparation, Characterization, ROS Generation, and Photocatalytic Activity

Malec,

Warszyńska,

Repetowski

et al. 2023

Molecules

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Novel hybrid TiO2-based materials were obtained by adsorption of two different porphyrins on the surface of nanoparticles—commercially available 5,10,15,20-tetrakis(4-sulfonatophenyl)porphyrin (TPPS) and properly modified metalloporphyrin—5,10,15,20-tetrakis(2,6-difluoro-3-sulfophenyl)porphyrin palladium(II) (PdF2POH). The immobilization of porphyrins on the surface of TiO2 was possible due to the presence of sulfonyl groups. To further elevate the adsorption of porphyrin, an anchoring linker—4-hydroxybenzoic acid (PHBA)—was used. The synthesis of hybrid materials was proven by electronic absorption spectroscopy, dynamic light scattering (DLS), and photoelectrochemistry. Results prove the successful photosensitization of TiO2 to visible light by both porphyrins. However, the presence of the palladium ion in the modifier structure played a key role in strong adsorption, enhanced charge separation, and thus effective photosensitization. The incorporation of halogenated metalloporphyrins into TiO2 facilitates the enhancement of the comprehensive characteristics of the investigated materials and enables the evaluation of their performance under visible light. The effectiveness of reactive oxygen species (ROS) generation was also determined. Porphyrin-based materials with the addition of PHBA seemed to generate ROS more effectively than other composites. Interestingly, modifications influenced the generation of singlet oxygen for TPPS but not hydroxyl radical, in contrast to PdF2POH, where singlet oxygen generation was not influenced but hydroxyl radical generation was increased. Palladium (II) porphyrin-modified materials were characterized by higher photostability than TPPS-based nanostructures, as TPPS@PHBA-P25 materials showed the highest singlet oxygen generation and may be oxidized during light exposure. Photocatalytic activity tests with two model pollutants—methylene blue (MB) and the opioid drug tramadol (TRML)—confirmed the light dose-dependent degradation of those two compounds, especially PdF2POH@P25, which led to the virtually complete degradation of MB.

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Titanium dioxide as a photocatalyst to create self-cleaning concrete

Cited by 17 publications

References 2 publications

Photocatalytic Concrete Using ZnO and Al₂O₃ - A Review

Photocatalytic Concrete Using ZnO and Al₂O₃ - A Review

The Combined Effect of Bubble and Photo Catalysis Technology in BTEX Removal from Produced Water

Enhancing Visible-Light Photocatalysis with Pd(II) Porphyrin-Based TiO2 Hybrid Nanomaterials: Preparation, Characterization, ROS Generation, and Photocatalytic Activity

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Titanium dioxide as a photocatalyst to create self-cleaning concrete

Cited by 17 publications

References 2 publications

Photocatalytic Concrete Using ZnO and Al2O3 - A Review

Photocatalytic Concrete Using ZnO and Al2O3 - A Review

The Combined Effect of Bubble and Photo Catalysis Technology in BTEX Removal from Produced Water

Enhancing Visible-Light Photocatalysis with Pd(II) Porphyrin-Based TiO2 Hybrid Nanomaterials: Preparation, Characterization, ROS Generation, and Photocatalytic Activity

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Product

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About

Photocatalytic Concrete Using ZnO and Al₂O₃ - A Review

Photocatalytic Concrete Using ZnO and Al₂O₃ - A Review