Photocatalytic concrete paving block reinforced by TiO2 nanotubes for NO removal

Meng, Chengqi; Dong, Pengyu; Tian, Hao; Cheng, Ting; Li, Jianjun; Liu, Yin; Yang, Xiuli; Xie, Mingjun; Chen, Xiaowei; Xi, Xinguo

doi:10.1007/s10853-020-05048-w

Cited by 10 publications

(5 citation statements)

References 44 publications

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“…[21][22][23] Besides, our previous study demonstrated that TiO 2 nanotubes could be dedicated to improving photocatalytic performance for NO purication in addition to strengthening the mechanical strength of the concrete block. 24 Nevertheless, the reported photocatalytic removal efficiency of NO x over TiO 2 -cement pavement was considerably poor even with high TiO 2 loading. 13,23,25 which is due to the inadequate utilization efficiency of solar energy derived from anatase TiO 2 's large band gap (3.2 eV) and the constrained quantum efficiency brought on by the slow electron-hole pair separation rate, especially for building material applications.…”

Section: Introductionmentioning

confidence: 99%

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Solar-driven photocatalytic removal of NO over a concrete paving eco-block containing black TiO₂

Dong,

Wang,

Tan

et al. 2023

J. Mater. Chem. A

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Section: Introductionmentioning

confidence: 99%

“…21–23 Besides, our previous study demonstrated that TiO 2 nanotubes could be dedicated to improving photocatalytic performance for NO purification in addition to strengthening the mechanical strength of the concrete block. 24…”

Section: Introductionmentioning

confidence: 99%

Solar-driven photocatalytic removal of NO over a concrete paving eco-block containing black TiO₂

Dong,

Wang,

Tan

et al. 2023

J. Mater. Chem. A

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“…Therefore, controlling compressive strength values from product density is essential [32], especially in small industries. Several studies have suggested that the analysis of the effects of density on compressive strength must involve cube and block tests [33,34]. Special attention is needed in small industries that produce unstable compressive strength values, even lower than the compressive strength achieved using machines.…”

Section: Introductionmentioning

confidence: 99%

Laboratory Innovation to Investigate Concrete Paving Blocks Compressive Strength

Lumingkewas,

Hadiwardoyo,

Hadiwardoyo

2023

Civ Eng J

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This research aims to evaluate the block method against the cube test method using variations in thickness. Paving blocks can be produced using a hydraulic machine or a simple press, and their performance can be measured based on density and compressive strength tests. The block test method shows that with the same material composition forming the paving block, a paving block with a higher thickness can lead to a lower compressive strength value. In contrast, the cube test method shows different results. The paving blocks used in this study had width and length sizes of 100 and 200 mm, respectively, and had varying heights of 60, 80, and 100 mm. The results reveal that the compressive strength of concrete paving blocks is more precise based on density. Furthermore, the empirical equation and conversion coefficient of the compressive strength of the block test to the cube test have been obtained. This empirical equation is highly recommended for the road pavement industry in controlling the quality of compressive strength, even when using block tests. Further research can help develop a formula for using additive materials in paving blocks. Doi: 10.28991/CEJ-2023-09-11-03 Full Text: PDF

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“…With a motive to reduce vehicular pollution, in ambient air, studies have identified the usage of photocatalytic material, i.e., TiO 2 , on the asphalt roads, as significantly efficient [19,20]. It has been reported that when applied on the surface of the roads, TiO 2 can significantly reduce the concentration of several pollutants, viz., organic carbon, NO x , SO 2 , and volatile organic carbons (VOCs) [21][22][23]. To reduce the ambient air pollution, many countries, around the world have also adopted the usage of TiO 2 in the construction of pavements, buildings, windows, etcetera [20,24,25].…”

Section: Introductionmentioning

confidence: 99%

RSM-Based Optimization of the Parameters Affecting TiO2-Mediated UV Photocatalysis of Vehicular Emissions in Enclosed Parking Garages

Singh

Thind

Verma

et al. 2021

International Journal of Photoenergy

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In the preceding times, the number of enclosed parking garages has increased significantly in developing nations. The toxic emissions from vehicular exhausts are expected to drastically compromise the environmental conditions of the parking garages. Subsequently, exposure of humans to these accumulated pollutants is also expected to degrade their health. Therefore, in the present investigation, efforts were made to estimate the applicability of TiO2-mediated UV photocatalysis in degrading the concentration of vehicular emissions, viz., NOx and SO2, in the enclosed parking garages (EPGs). In this regard, an artificial EPGs’ environment was created and experiments were designed using the Box-Behnken design in combination with response surface methodology. The process parameters chosen for maximizing the degradation of the pollutants were a concentration of TiO2 emulsion (20 to 120 ml/m2), UV irradiance (1 to 5 mW/cm2), and relative humidity (10 to 50%). Optimization of the laboratory experiments revealed that at optimal conditions of the process parameters, i.e., a concentration of TiO2 emulsion = 77.50 ml / m 2 , intensity of UV irradiance = 3 mW / c m 2 , and relative humidity = 43.2 % , maximum degradation of the NOx and SO2, i.e., 61.24% and 55.05%, respectively, was achieved. Further, it was revealed that relative humidity may prove to be the limiting factor while using the TiO2-mediated UV photocatalysis in humid areas. Findings of this study may prove beneficial in urban planning as it may assist scientific auditory and local authorities in identifying the applicability of TiO2-based photocatalysis in mitigating the impacts of vehicular emissions.

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Photocatalytic concrete paving block reinforced by TiO2 nanotubes for NO removal

Cited by 10 publications

References 44 publications

Solar-driven photocatalytic removal of NO over a concrete paving eco-block containing black TiO₂

Solar-driven photocatalytic removal of NO over a concrete paving eco-block containing black TiO₂

Laboratory Innovation to Investigate Concrete Paving Blocks Compressive Strength

RSM-Based Optimization of the Parameters Affecting TiO2-Mediated UV Photocatalysis of Vehicular Emissions in Enclosed Parking Garages

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Photocatalytic concrete paving block reinforced by TiO2 nanotubes for NO removal

Cited by 10 publications

References 44 publications

Solar-driven photocatalytic removal of NO over a concrete paving eco-block containing black TiO2

Solar-driven photocatalytic removal of NO over a concrete paving eco-block containing black TiO2

Laboratory Innovation to Investigate Concrete Paving Blocks Compressive Strength

RSM-Based Optimization of the Parameters Affecting TiO2-Mediated UV Photocatalysis of Vehicular Emissions in Enclosed Parking Garages

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Product

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Solar-driven photocatalytic removal of NO over a concrete paving eco-block containing black TiO₂

Solar-driven photocatalytic removal of NO over a concrete paving eco-block containing black TiO₂