Reactive Oxygen Species and Catalytic Active Sites in Heterogeneous Catalytic Ozonation for Water Purification

Yu, Guangfei; Wang, Yuxian; Cao, Hongbin; Zhao, He; Xie, Yongbing

doi:10.1021/acs.est.0c00575

Cited by 370 publications

(141 citation statements)

References 159 publications

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“…Davidsdottir et al deposited the TiO 2 films on metallic substrate by DC magnetron sputtering which had a size of approximately 26 nm of crystallite size [63], as shown by XRD, while Gualdrón-Reyes et al calculated approximately 17 nm after the TiO2 deposition on the stainless steel [74]. Similar crystallite sizes (11-35 nm) were obtained preparing TiO 2 by sol gel method [36,75] or other chemically based methods (10)(11)(12)(13)(14)(15)(16)(17)(18)(19) [39,76].…”

Section: Morphology Cross-section and Roughness Analysismentioning

confidence: 85%

“…The oxidation power of hydroxyl radicals (oxidation potential 2.8 V) is higher than chlorine (oxidation potential 1.36 V) and even ozone (oxidation potential 2.07 V) [1]. There are various types of AOPs including the Fenton process [11], electrochemical oxidation [12], photocatalysis [13], electrical discharge [14], catalytic ozonation [15,16], sonolysis [17], or wet air oxidation [18]. All of the mentioned AOPs have their own advantages as well as disadvantages, e.g., the Fenton process is known as an efficient, non-toxic and cost-effective process.…”

Section: Introductionmentioning

confidence: 99%

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Floating Carbon-Doped TiO2 Photocatalyst with Metallic Underlayers Investigation for Polluted Water Treatment under Visible-Light Irradiation

et al. 2021

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In the current study, we analysed the influence of metallic underlayers on carbon-doped TiO2 films for RhB decomposition and Salmonella typhimurium inactivation under visible-light irradiation. All the experiments were divided into two parts. First, layered M/C-doped-TiO2 film structures (M = Ni, Nb, Cu) were prepared by magnetron sputtering technique on borosilicate glass substrates in the two-step deposition process. The influence of metal underlayer on the formation of the carbon-doped TiO2 films was characterised by X-ray diffractometer, scanning electron microscope, and atomic force microscope. The comparison between the visible-light assisted photocatalytic activity of M/C-doped TiO2 structures was performed by the photocatalytic bleaching tests of Rhodamine B dye aqueous solution. The best photocatalytic performance was observed for Ni/C-doped-TiO2 film combination. During the second part of the study, the Ni/C-doped-TiO2 film combination was deposited on high-density polyethylene beads which were selected as a floating substrate. The morphology and surface chemical analyses of the floating photocatalyst were performed. The viability and membrane permeability of Salmonella typhimurium were tested in cycling experiments under UV-B and visible-light irradiation. Three consecutive photocatalytic treatments of fresh bacteria suspensions with the same set of floating photocatalyst showed promising results, as after the third 1 h-long treatment bacteria viability was still reduced by 90% and 50% for UV-B and visible-light irradiation, respectively. The membrane permeability and ethidium fluorescence results suggest that Ni underlayer might have direct and indirect effect on the bacteria inactivation process. Additionally, relatively low loss of the photocatalyst efficiency suggests that floating C-doped TiO2 photocatalyst with the Ni underlayer might be seen as the possible solution for the used photocatalyst recovery issue.

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Section: Morphology Cross-section and Roughness Analysismentioning

confidence: 85%

Section: Introductionmentioning

confidence: 99%

Floating Carbon-Doped TiO2 Photocatalyst with Metallic Underlayers Investigation for Polluted Water Treatment under Visible-Light Irradiation

et al. 2021

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“…Before evaluating the mathematical models, the Hatta number (Ha) was computed for each of the experimental observations based on a first-order rate law according to Equation (30). Then, depending on the type of regime, the enhancement factor was computed [49].…”

Section: Mathematical Modelsmentioning

confidence: 99%

“…According to Yu et al, the amount of Lewis active sites (LAS) for a given catalyst significantly influences the degradation and mineralization during the COz [28][29][30]. Furthermore, for PCOz processes, a large amount of LAS could also increase the rate of capture of pairs electron-hole because of the high concentration of adsorbed ozone molecules, consequently increasing its oxidative potential [31].…”

Section: Introductionmentioning

confidence: 99%

Mechanistic Model and Optimization of the Diclofenac Degradation Kinetic for Ozonation Processes Intensification

Acosta-Angulo

Lara-Ramos

Díaz-Angulo

et al. 2021

Water

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This work focused on estimating the rate constants for three ozone-based processes applied in the degradation of diclofenac. The ozonation (Oz) and its intensification with catalysis (COz) and photocatalysis (PCOz) were studied. Three mathematical models were evaluated with a genetic algorithm (GA) to find the optimal values for the kinetics constants. The Theil inequality coefficient (TIC) worked as a criterion to assess the models’ deviation. The diclofenac consumption followed a slow kinetic regime according to the Hatta number (Ha<0.3). However, it strongly contrasted with earlier studies. The obtained values for the volumetric rate of photon absorption (VRPA) corresponding to the PCOz process (1.75×10−6 & 6.54×10−7 Einstein L−1 min−1) were significantly distant from the maximum (2.59×10−5 Einstein L−1 min−1). The computed profiles of chemical species proved that no significant amount of hydroxyl radicals was produced in the Oz, whereas the PCOz achieved the highest production rate. According to this, titanium dioxide significantly contributed to ozone decomposition, especially at low ozone doses. Although the models’ prediction described a good agreement with the experimental data (TIC<0.3), the optimization algorithm was likely to have masked the rate constants as they had highly deviated from already reported values.

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“…Compared with α-MnO 2 , the main reason for the decrease in oxygen vacancies content in α-MnO 2 -NH 2 -GO catalyst probably because some redox reactions happened during the reaction with amination and doping of graphene, leading to Mn 3+ / Mn 4+ and O II /O I value drop. Yu et al [27] studied the reaction mechanism of catalytic oxidation of organics in water, they also proposed that the oxygen vacancy content has a strong correlation with the performance of the catalyst. In this paper, a hydrothermal synthesis method is used to prepare a highly efficient catalyst with high oxygen vacancy content.…”

Section: Surface Chemical State Analysis Of Synthetic Materialsmentioning

confidence: 99%

Influence of Oxygen Vacancy in Mangan-based Catalyst on Phenol Removal Via Catalytic Ozonation

Xia¹,

Chen²,

Li³

et al. 2020

JEECE

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In order to improve the performance of the catalyst applied in ozonation, this work show the hydrothermal synthesis routine to prepare MnO 2 with different oxygen vacancy content. The α-MnO 2 was aminated and further processed with doped graphene oxide (GO) to obtain high oxygen vacancy content α-MnO 2 -NH 2 -GO, which was subsequently used for catalyzing ozonation phenol degradate. The catalysts were characterized by X-ray diffraction (XRD), X-ray photoelectron spectra (XPS), Brunner-Emmet-Teller (BET), H 2 -temperature-programmed reduction (H 2 -TPR), scanning electron microscopy (SEM), etc. Characterization and experimental results showed that the oxygen vacancy content has an important effect on the catalytic performance of the catalyst, MnO 2 with low average oxidation state showed better catalytic ozonation performance. The coexistence of Mn 3+ and Mn 4+ have great significant role for the continuous generation of free radicals and the restoration of oxygen vacancies. The doping of GO can increase the electron transfer rate, and improve the catalytic performance. The catalytic performance of α-MnO 2 -NH 2 -GO is better than α-MnO 2 , phenol removal rate can achieve more than 99% within 30 min, and superoxide radicals can be determined by different free radical trapping agents. The results of main active oxygen and reaction kinetics research showed that the degradation of phenol is a first-order reaction whether α-MnO 2 -NH 2 -GO or α-MnO 2 is used as a catalyst.

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Reactive Oxygen Species and Catalytic Active Sites in Heterogeneous Catalytic Ozonation for Water Purification

Cited by 370 publications

References 159 publications

Floating Carbon-Doped TiO2 Photocatalyst with Metallic Underlayers Investigation for Polluted Water Treatment under Visible-Light Irradiation

Floating Carbon-Doped TiO2 Photocatalyst with Metallic Underlayers Investigation for Polluted Water Treatment under Visible-Light Irradiation

Mechanistic Model and Optimization of the Diclofenac Degradation Kinetic for Ozonation Processes Intensification

Influence of Oxygen Vacancy in Mangan-based Catalyst on Phenol Removal Via Catalytic Ozonation

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