Photocatalytic ethylbenzene degradation associated with ozone (TiO2/UV/O3) under different percentages of catalytic coating area: Evaluation of process parameters

Saldanha, Larissa Albuquerque Silva; Santos, Nilza Tatiane das Grac̨as; Tomaz, Edson

doi:10.1016/j.seppur.2021.118344

Cited by 20 publications

(11 citation statements)

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“…In order to evaluate the effects of the coating area of the annular reactor on the performance of photocatalytic degradation of ethylbenzene, TiO 2 catalyst was coated on the quartz tube with the photocatalytic coating area varied from 0% to 100% by Saldanha et al 103 It was found that optimum performance was achieved when the coating area percentage was about 70%, which was attributed to a synergistic effect between solid phase and gas phase reactions in the reactor. A similar result was reported by Ribeiro's group, 104 who also studied the influence of coating area on photocatalytic degradation of toluene in the presence of ozone.…”

Section: Annular Reactormentioning

confidence: 99%

Photocatalytic Oxidation for Volatile Organic Compounds Elimination: From Fundamental Research to Practical Applications

Zhang

Wang

Xie

et al. 2022

Environ. Sci. Technol.

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Photocatalysis is regarded as one of the most promising technologies for indoor volatile organic compounds (VOCs) elimination due to its low cost, safe operation, energy efficiency, and high mineralization efficiency under ambient conditions. However, the practical applications of this technology are limited, despite considerable research efforts in recent decades. Until now, most of the works were carried out in the laboratory and focused on exploring new catalytic materials. Only a few works involved the immobilization of catalysts and the design of reactors for practical applications. Therefore, this review systematically summarizes the research and development on photocatalytic oxidation (PCO) of VOCs, with emphasis on recent catalyst's immobilization and reactor designs in detail. First, different types of photocatalytic materials and the mechanisms for PCO of VOCs are briefly discussed. Then, both the catalyst's immobilization techniques and reactor designs are reviewed in detail. Finally, the existing challenges and future perspectives for PCO of VOCs are proposed. This work aims to provide updated information and research inspirations for the commercialization of this technology in the future.

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Section: Annular Reactormentioning

confidence: 99%

Photocatalytic Oxidation for Volatile Organic Compounds Elimination: From Fundamental Research to Practical Applications

Zhang

Wang

Xie

et al. 2022

Environ. Sci. Technol.

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“…The ozonation process for BTEX elimination at ambient temperature is favorable as compared to other techniques given energy saving 12 . Auxiliary processes such as photocatalysis 13 , O 3 /H 2 O 2 (proxone process) 14 , and O 3 /ultrasonic can increase the performance of OP. In the proxone process, the main mechanism of mineralization of toluene and ethylbenzene relies on in-direct oxidation via free oxidation radicals, such as OH • , O 2…”

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confidence: 99%

Investigation of photocatalytic-proxone process performance in the degradation of toluene and ethyl benzene from polluted air

Mehralipour

Jafari

Gholami

et al. 2023

Sci Rep

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In this study, toluene and ethylbenzene were degraded in the photocatalytic-proxone process using BiOI@NH2-MIL125(Ti)/Zeolite nanocomposite. The simultaneous presence of ozone and hydrogen peroxide is known as the proxone process. Nanocomposite Synthesis was carried out using the solvothermal method. Inlet airflow, ozone concentrations, H2O2 concentrations, relative humidity, and initial pollutants concentrations were studied. The nanocomposite was successfully synthesized based on FT-IR, BET, XRD, FESEM, EDS element mapping, UV–Vis spectra and TEM analysis. A flow rate of 0.1 L min−1, 0.3 mg min−1 of ozone, 150 ppm of hydrogen peroxide, 45% relative humidity, and 50 ppmv of pollutants were found to be optimal operating conditions. Both pollutants were degraded in excess of 95% under these conditions. For toluene and ethylbenzene, the synergistic of mechanisms effect coefficients were 1.56 and 1.76, respectively. It remained above 95% efficiency 7 times in the hybrid process and had good stability. Photocatalytic-proxone processes were evaluated for stability over 180 min. The remaining ozone levels in the process was insignificant (0.01 mg min−1). The CO2 and CO production in the photocatalytic-proxone process were 58.4, 5.7 ppm for toluene and 53.7, and 5.5 ppm for ethylbenzene respectively. Oxygen gas promoted and nitrogen gas had an inhibitory effect on the effective removal of pollutants. During the pollutants oxidation, various organic intermediates were identified.

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“…Volatile organic compounds (VOCs) contribute to the formation of pollutants such as photochemical smog and ozone in the atmosphere. 1 In addition, long-term exposure to VOCs can pose a threat to human health, including headaches, damage to the respiratory system and nervous system, 2,3 and in severe cases, increase the risk of cancer. 4 Therefore, it is very important to take effective measures to remove VOCs in the environment and minimize the threats to environment and human health.…”

Section: Introductionmentioning

confidence: 99%

Efficient Degradation of Toluene over MnO₂/TiO₂ Nanobelts under Vacuum Ultraviolet Irradiation

Zhang

Guo

et al. 2023

Ind. Eng. Chem. Res.

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Toluene, as a kind of volatile organic compounds, not only causes pollution to the atmosphere and water but also damages human health. Although vacuum ultraviolet (VUV) can effectively promote the degradation of toluene, it will produce a large amount of O 3 , which will cause secondary pollution. Therefore, it is very important to study catalysts that can promote both toluene degradation and ozone decomposition. In this work, a MnO 2 /TiO 2 catalyst with uniformly dispersed MnO 2 was prepared using the immersion reduction method, which was used to degrade toluene under VUV. The toluene removal efficiency was improved by the utilization and elimination of O 3 . The toluene removal efficiency over the prepared MnO 2 /TiO 2 catalyst was 88%, and the O 3 removal rate was 97%. The toluene removal efficiency under VUV was 4.9 times that of UV. The synergistic effect of VUV and multifunctional catalyst effectively improved the toluene removal efficiency.

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Photocatalytic ethylbenzene degradation associated with ozone (TiO2/UV/O3) under different percentages of catalytic coating area: Evaluation of process parameters

Cited by 20 publications

References 50 publications

Photocatalytic Oxidation for Volatile Organic Compounds Elimination: From Fundamental Research to Practical Applications

Photocatalytic Oxidation for Volatile Organic Compounds Elimination: From Fundamental Research to Practical Applications

Investigation of photocatalytic-proxone process performance in the degradation of toluene and ethyl benzene from polluted air

Efficient Degradation of Toluene over MnO₂/TiO₂ Nanobelts under Vacuum Ultraviolet Irradiation

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Photocatalytic ethylbenzene degradation associated with ozone (TiO2/UV/O3) under different percentages of catalytic coating area: Evaluation of process parameters

Cited by 20 publications

References 50 publications

Photocatalytic Oxidation for Volatile Organic Compounds Elimination: From Fundamental Research to Practical Applications

Photocatalytic Oxidation for Volatile Organic Compounds Elimination: From Fundamental Research to Practical Applications

Investigation of photocatalytic-proxone process performance in the degradation of toluene and ethyl benzene from polluted air

Efficient Degradation of Toluene over MnO2/TiO2 Nanobelts under Vacuum Ultraviolet Irradiation

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Efficient Degradation of Toluene over MnO₂/TiO₂ Nanobelts under Vacuum Ultraviolet Irradiation