Purification of automobile exhaust gas by activated carbon supported Fe3+ modified nano-TiO2 and its application on asphalt pavement

According to the characteristics of asphalt pavement, a kind of nano-TiO2 photocatalytic coating was prepared by using the emulsified asphalt as the carrier. All of its properties met the technical requirements. An exhaust gas degradation test device and its test steps were developed. The evaluation indexes, cumulative degradation rate, and degradation efficiency, were put forward. From the two aspects of the nano-TiO2 content in photocatalytic coatings and the spraying amount of photocatalytic coatings in the surface of slabs (300 mm × 300 mm), the exhaust gas degradation effects, the performances of skid resistance, and the water permeability of asphalt mixture were analyzed. The test results showed that the cumulative degradation rate of exhaust gas was better when nano-TiO2 content was increased in the range of 0–8% and the spraying amount was changed in the range of 0–333.3 g/m2. In practical engineering applications, the anti-skid performance of asphalt pavement can be satisfied when the spraying amount of photocatalytic coating was limited to under 550 g/m2. The spraying amount of nano-TiO2 photocatalytic coating had little effect on the water permeability of the asphalt mixture. Therefore, 8% nano-TiO2 content in the coating and a 400 g/m2 spraying amount were finally recommended based on the photocatalytic properties, as well as for economic reasons.

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Study on Application of TiO2 Photocatalytic Materials in Purification of Highway Tunnel Tail Gas

E3S Web of Conferences ◽

10.1051/e3sconf/202123301073 ◽

2021 ◽

Vol 233 ◽

pp. 01073

Author(s):

Zhiqiang Liu ◽

Haifeng Jiang ◽

Minmin Yuan

Keyword(s):

Air Pollutants ◽

Present Situation ◽

Chemical Pollution ◽

Exhaust Gas ◽

Nano Tio2 ◽

Automobile Exhaust ◽

Highway Tunnel ◽

Biological Pollution ◽

Narrow Space ◽

Photocatalytic Materials

In recent years, with the continuous expansion of the scale of highway tunnels in China, the problem of tail gas pollution in highway tunnels has become increasingly prominent. The tunnel is a long and narrow space, which makes air pollutants easy to accumulate and difficult to diffuse. In this paper, the present situation and application scenarios of TiO2 photocatalytic materials in the purification technology of highway tunnel exhaust gas are studied and analyzed, and the nano TiO2 photocatalytic materials which can be applied to highway tunnels, corresponding highway stations and their affiliated facilities are put forward, so as to greatly degrade automobile exhaust gas, atmospheric chemical pollution and environmental biological pollution.

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Study on Mix Proportion Optimization of Nano-TiO2 Composite Photocatalyst for Pervious Asphalt Pavement

IOP Conference Series Earth and Environmental Science ◽

10.1088/1755-1315/643/1/012147 ◽

2021 ◽

Vol 643 ◽

pp. 012147

Author(s):

He Xudong ◽

Zheng Fan ◽

Yang Zhihang ◽

Zhang Guojun ◽

Xu Yidong

Keyword(s):

Asphalt Pavement ◽

Nano Tio2 ◽

Composite Photocatalyst ◽

Mix Proportion

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TiO2-Powdered Activated Carbon (TiO2/PAC) for Removal and Photocatalytic Properties of 2-Methylisoborneol (2-MIB) in Water

Water ◽

10.3390/w13121622 ◽

2021 ◽

Vol 13 (12) ◽

pp. 1622

Author(s):

Xiao-Pin Guo ◽

Peng Zang ◽

Yong-Mei Li ◽

Dong-Su Bi

Keyword(s):

Activated Carbon ◽

Natural Organic Matter ◽

Uv Light ◽

Sol Gel ◽

Light Irradiation ◽

Nano Tio2 ◽

Uv Light Irradiation ◽

Adsorption Capacities ◽

Taste And Odor ◽

Composite Photocatalysts

2-methylisoborneol (2-MIB) is a common taste and odor compound caused by off-flavor secondary metabolites, which represents one of the greatest challenges for drinking water utilities worldwide. A TiO2-coated activated carbon (TiO2/PAC) has been synthesized using the sol-gel method. A new TiO2/PAC photocatalyst has been successfully employed in photodegradation of 2-MIB under UV light irradiation. In addition, the combined results of XRD, SEM-EDX, FTIR and UV-Vis suggested that the nano-TiO2 had been successfully loaded on the surface of PAC. Experimental results of 2-MIB removal indicated that the adsorption capacities of PAC for 2-MIB were higher than that of TiO2/PAC. However, in the natural organic matter (NOM) bearing water, the removal efficiency of 2-MIB by TiO2/PAC and PAC were 97.8% and 65.4%, respectively, under UV light irradiation. Moreover, it was shown that the presence of NOMs had a distinct effect on the removal of MIB by TiO2/PAC and PAC. In addition, a simplified equivalent background compound (SEBC) model could not only be used to describe the competitive adsorption of MIB and NOM, but also represent the photocatalytic process. In comparison to other related studies, there are a few novel composite photocatalysts that could efficiently and rapidly remove MIB by the combination of adsorption and photocatalysis.

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Fabrication and Evaluation of Nano-TiO2 Superhydrophobic Coating on Asphalt Pavement

Materials ◽

10.3390/ma14010211 ◽

2021 ◽

Vol 14 (1) ◽

pp. 211

Author(s):

Hongfeng Li ◽

Xiangwen Lin ◽

Hongguang Wang

Keyword(s):

Contact Angle ◽

Stearic Acid ◽

Asphalt Pavement ◽

Asphalt Mixture ◽

Waterborne Polyurethane ◽

Superhydrophobic Coating ◽

Nano Tio2 ◽

Sem Image ◽

Low Surface Energy ◽

Water Damage

In order to address water damage of asphalt pavement, reduce the occurrence of water-related potholes, deformation, and other diseases, and improve the performance and service life of the pavement, a nano-TiO2 superhydrophobic coating (PSC) on asphalt pavement was prepared from waterborne polyurethane and nano-TiO2 modified by stearic acid. FT-IR measured stearic acid successfully modified low surface energy substance on the surface of nano-TiO2. The SEM image shows that the PSC has a rough surface structure. The contact angle and rolling angle of the PSC in the contact angle test are 153.5° and 4.7°, respectively. PSC has a super-hydrophobic ability, which can improve the water stability of the asphalt mixture. Although the texture depth and pendulum value have been reduced by 2.5% and 4.4%, respectively, they all comply with the standard requirements. After the abrasion resistance test, the PSC coating still has a certain hydrophobic ability. These results surface PSC coating can effectively reduce water damage on asphalt pavement, and has considerable application value.

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