Comparison of emerging contaminant abatement by conventional ozonation, catalytic ozonation, O3/H2O2 and electro-peroxone processes

Guo, Yang; Zhao, Erzhuo; Wang, Jun; Zhang, Xiaoyuan; Huang, Haiou; Yu, Gang; Wang, Yujue

doi:10.1016/j.jhazmat.2019.121829

Cited by 54 publications

(16 citation statements)

References 41 publications

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“…It is important to note that this conclusion is probably specific to the test conditions, for example, the water matrix and ozone doses used in the studies. For example, previous studies have shown that adding catalysts (e.g., Mn 2+ and MnO 2 ) or H 2 O 2 can usually substantially enhance the • OH yield during ozonation of water matrices, exerting relatively high O 3 stability [e.g., groundwater with low dissolved organic carbon (DOC) and high carbonate], but insignificantly during the ozonation of water matrices where the O 3 decomposition is mainly driven by the radical chain reactions (e.g., wastewater with high DOC). ,,− The contradictory findings of different studies highlight that to avoid uncertainties in interpreting catalytic ozonation results, it is necessary to monitor the O 3 transferred/consumed doses during the laboratory semi-batch experiments. For example, overlooking the effects of catalysts on enhancing the O 3 transfer/consumption during catalytic ozonation may lead to overestimation of the activity of the catalysts for converting O 3 to • OH.…”

Section: Resultsmentioning

confidence: 99%

Evaluation of the Effect of Catalysts on Ozone Mass Transfer and Pollutant Abatement during Laboratory Catalytic Ozonation Experiments: Implications for Practical Water and Wastewater Treatment

Long

Guo

et al. 2022

ACS EST Eng.

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Adding catalysts can usually substantially enhance pollutant removal during laboratory semi-batch ozonation experiments with continuous ozone gas bubbling. However, it is unclear whether the enhanced pollutant abatement is mainly caused by the higher •OH yields (moles of •OH formed per mole of O3 consumed) or the higher O3 utilization efficiency in the presence of the catalyststwo effects that can or cannot be effectively transferred to large-scale applications, respectively. To distinguish these two effects during the laboratory experiments, this study compared oxalate removal by conventional ozonation (in the absence of catalysts) and catalytic ozonation with three carbon nanotube catalysts based on the consumed O3 doses during the different processes. In addition, the results of several previous studies that had evaluated varying catalysts (e.g., NiCo2O4, MnFe2O4, and MnO2) for pollutant removal by catalytic ozonation were revisited based on the consumed O3 doses measured in these studies. The results show that while all the catalysts considerably accelerated O3 transfer/consumption and pollutant removal during catalytic ozonation than during conventional ozonation, many of them did not enhance the extent of pollutant removal when the same O3 doses were consumed during the two processes. This finding suggests that in the laboratory experiments, these catalysts only enhanced the O3 utilization efficiency but did not significantly enhance the •OH yield from O3 decomposition during catalytic ozonation relative to conventional ozonation. Therefore, they may not be able to enhance pollutant removal during large-scale applications to the same extent as has been shown in the laboratory experiments. These results indicate that to more realistically predict the performance of catalysts for large-scale applications, the extent of pollutant removal should be evaluated based on the transferred/consumed O3 doses during the laboratory experiments.

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Section: Resultsmentioning

confidence: 99%

Evaluation of the Effect of Catalysts on Ozone Mass Transfer and Pollutant Abatement during Laboratory Catalytic Ozonation Experiments: Implications for Practical Water and Wastewater Treatment

Long

Guo

et al. 2022

ACS EST Eng.

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“…Photocatalysts are the central element of the photocatalysis process that converts solar energy into a chemical process to degrade the organic pollutant (Guo et al, 2020). For the photocatalysis process, the semiconductor photocatalyst is widely used because semiconductors have a moderate bandgap and oxidation and reduction can simultaneously occur on the surface of the photocatalyst (Wang and Chen 2020).…”

Section: Photocatalytic Degradationmentioning

confidence: 99%

Recent advances in the elimination of persistent organic pollutants by photocatalysis

Gaur

Dutta

Singh

et al. 2022

Front. Environ. Sci.

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The non-ending needs of growing human population are being met by rapid industrialization and globalization, which have nowadays become an indispensable component of growth. Although these activities have led to phenomenal growth of the human civilization, at the same time, they have resulted in severe environmental pollution by discharge of highly toxic waste. This waste is severely detrimental not only for the environment but also for the health of the human population. Among different classes of pollutants, one being considered as one of the highly toxic ones is that of persistent organic pollutants (POPs). Advanced oxidation technologies (AOTs) play a major role in the degradation of pollutants by converting organic pollutants into CO2, H2O, and mineralized inorganic ions. AOTs include UV-based photocatalysis, ozonation, electrochemical oxidation, and Fenton and Fenton-like processes There are some difficulties and challenges associated with AOT, such as being highly capital intensive and high consumption of energy. To overcome these bottlenecks, photocatalytic degradation is a promising method that uses solar energy for the degradation of such pollutants. Photocatalysis is further classified into homogenous and heterogenous photocatalysis. As a part of heterogenous photocatalysis, semiconductor photocatalysts have received great attention; but because of their drawbacks such as the recombination of the electron/hole pair, low adsorption rate, and low surface area coverage, nanotechnology was considered for bringing a novel and enhanced remediation photocatalysis process. To this end, the designing of a more efficient photocatalyst by modifying morphology, composition, and structure and reducing toxicity is the need of the hour for the abatement of environmental pollutants. This review focuses on the degradation and removal of highly toxic persistent organic pollutants by using photocatalytic degradation with a detailed account of the various pollutants, their degradation mechanism, process shortcomings, remedial measures, and future prospects.

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“…In order to enhance the ozonation process, several alternatives have been proposed, such as O 3 /UV, O 3 /H 2 O 2 or the incorporation of a catalyst [ 22 , 29 ]. This last option has been extensively studied with diverse materials: transition metal ions in homogeneous catalytic systems (Mn 2+ , Fe 3+ , Co 2+ , Cu 2+ and Zn 2+ ) or heterogeneous catalysts such as metal oxides (MnO 2 , TiO 2 , Al 2 O 3 , FeOOH and CeO 2 ), metals (Cu, Ru, Pt, Co) on supports (SiO 2 , Al 2 O 3 , TiO 2 , CeO 2 and activated carbon), zeolites, clays, activated carbon, etc.…”

Section: Catalytic Ozonationmentioning

confidence: 99%

Clay, Zeolite and Oxide Minerals: Natural Catalytic Materials for the Ozonation of Organic Pollutants

Inchaurrondo

Font

2022

Molecules

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Ozone has been successfully employed in water treatment due to its ability to oxidize a wide variety of refractory compounds. In order to increase the process efficiency and optimize its economy, the implementation of heterogeneous catalysts has been encouraged. In this context, the use of cheap and widely available natural materials is a promising option that would promote the utilization of ozone in a cost-effective water treatment process. This review describes the use of natural clays, zeolites and oxides as supports or active catalysts in the ozonation process, with emphasis on the structural characteristics and modifications performed in the raw natural materials; the catalytic oxidation mechanism; effect of the operating parameters and degradation efficiency outcomes. According to the information compiled, more research in realistic scenarios is needed (i.e., real wastewater matrix or continuous operation in pilot scale) in order to transfer this technology to the treatment of real wastewater streams.

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Comparison of emerging contaminant abatement by conventional ozonation, catalytic ozonation, O3/H2O2 and electro-peroxone processes

Cited by 54 publications

References 41 publications

Evaluation of the Effect of Catalysts on Ozone Mass Transfer and Pollutant Abatement during Laboratory Catalytic Ozonation Experiments: Implications for Practical Water and Wastewater Treatment

Evaluation of the Effect of Catalysts on Ozone Mass Transfer and Pollutant Abatement during Laboratory Catalytic Ozonation Experiments: Implications for Practical Water and Wastewater Treatment

Recent advances in the elimination of persistent organic pollutants by photocatalysis

Clay, Zeolite and Oxide Minerals: Natural Catalytic Materials for the Ozonation of Organic Pollutants

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