Benchmarking recent advances and innovative technology approaches of Fenton, photo-Fenton, electro-Fenton, and related processes: A review on the relevance of phenol as model molecule

Brillas, Enric; Garcia‐Segura, Sergi

doi:10.1016/j.seppur.2019.116337

Cited by 285 publications

(73 citation statements)

References 241 publications

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“…This undesired side-reaction not only consumes OH, which will subsequently not be able to oxidize the target azo dye, but it also diminishes the available amount of H 2 O 2 . Moreover, the excessive accumulation of radical species can promote their dimerization following Reactions (9) and (10) [12,38]. These undesired reactions do not contribute to the overall photocatalytic performance, and may slow down the decolorization kinetics, as was observed experimentally (see Figure 6).…”

Section: Photocatalytic Activity On Azo Dye Decolorizationmentioning

confidence: 80%

Niobium Oxide Catalysts as Emerging Material for Textile Wastewater Reuse: Photocatalytic Decolorization of Azo Dyes

et al. 2019

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Niobium-based metal oxides are emerging semiconductor materials with barely explored properties for photocatalytic wastewater remediation. Brazil possesses the greatest reserves of niobium worldwide, being a natural resource that is barely exploited. Environmental applications of solar active niobium photocatalysts can provide opportunities in the developing areas of Northeast Brazil, which receives over 22 MJ m2 of natural sunlight irradiation annually. The application of photocatalytic treatment could incentivize water reuse practices in small and mid-sized textile businesses in the region. This work reports the facile synthesis of Nb2O5 catalysts and explores their performance for the treatment of colored azo dye effluents. The high photoactivity of this alternative photocatalyst makes it possible to quickly obtain complete decolorization, in less than 40 min of treatment. The optimal operational conditions are defined as 1.0 g L−1 Nb2O5 loading in slurry, 0.2 M of H2O2, pH 5.0 to treat up to 15 mg L−1 of methyl orange solution. To evaluate reutilization without photocatalytic activity loss, the Nb2O5 was recovered after the experience and reused, showing the same decolorization rate after several cycles. Therefore, Nb2O5 appears to be a promising photocatalytic material with potential applicability in wastewater treatment due to its innocuous character and high stability.

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Section: Photocatalytic Activity On Azo Dye Decolorizationmentioning

confidence: 80%

Niobium Oxide Catalysts as Emerging Material for Textile Wastewater Reuse: Photocatalytic Decolorization of Azo Dyes

et al. 2019

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“…Whereas, the combination in advanced ECP and PECP suggests a synergistic interaction that accelerates As(III) oxidation. This trend can be explained by the generation of redox mediators such as •OH with a high standard reduction potential of E • = 2.8 V vs. SHE [41] or Fe(IV) with E • =~2.0 V vs. SHE [42]. Accordingly, As(III) oxidation yields were found to increase in the sequence: EC < H 2 O 2 < ECP < PECP, with 42%, 51%, 83%, and 92% conversion at 0.5 C/L charge loading, respectively.…”

Section: Understanding the Role Of Oxidants In Arsenic Removalmentioning

confidence: 99%

Arsenic Removal by Advanced Electrocoagulation Processes: The Role of Oxidants Generated and Kinetic Modeling

et al. 2020

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Arsenic (As) is a naturally occurring element in the environment that poses significant risks to human health. Several treatment technologies have been successfully used in the treatment of As-contaminated waters. However, limited literature has explored advanced electrocoagulation (EC) processes for As removal. The present study evaluates the As removal performance of electrocoagulation, electrochemical peroxidation (ECP), and photo-assisted electrochemical peroxidation (PECP) technologies at circumneutral pH using electroactive iron electrodes. The influence of As speciation and the role of oxidants in As removal were investigated. We have identified the ECP process to be a promising alternative for the conventional EC with around 4-fold increase in arsenic removal capacity at a competitive cost of 0.0060 $/m3. Results also indicated that the rate of As(III) oxidation at the outset of electrochemical treatment dictates the extent of As removal. Both ECP and PECP processes reached greater than 96% As(III) conversion at 1 C/L and achieved 86% and 96% As removal at 5 C/L, respectively. Finally, the mechanism of As(III) oxidation was evaluated, and results showed that Fe(IV) is the intermediate oxidant generated in advanced EC processes, and the contribution of •OH brought by UV irradiation is insignificant.

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“…The Technological Maturity Level or TRL Table I. Technical criteria for selection of TAOs in real water treatment aspects determine the feasibility of implementing a new technology [38]- [40]. On the other hand, technological maturity is a new criterion used for the selection of TAOs and very little has been reported so far [41]- [43] The development of the prioritization matrix of the alternatives was developed with the values found in the literature normalized and iterated by each of the alternatives, Table 4, thus resulting in the prioritization of the TAOs.…”

Section: Technological Maturity Level (Trl)mentioning

confidence: 99%

Multi-criteria analysis for the selection of advanced oxidation technologies in the treatment of emerging pollutants

2020

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Although there is technical information on the efficiency of advanced oxidation technologies (TAOs) at the laboratory level, in some cases at the pilot level and few on a large scale, it is not easy to select the most appropriate technology for an effluent, since the selection of technology depends on the characteristics of the contaminated water. Through the application of the multicriteria analysis technique, this article proposes a scale of TAOs for the complementary treatment of water contaminated with contaminants emergent (CE). The chosen alternatives were the technologies with peroxide (H2O2), Ozone (O3) and Fenton (Fe/H2O2) processes, the evaluation criteria were electric energy consumption (EEO), technological maturity level, complexity of design / operation and cost of operation. The technology most recommended by AHP is ozone and peroxide / UV with a difference of 8.6% in the frequency in the evaluation of the criteria. For the AHP-TOPSIS methodology, peroxide / UV is the key technology over ozone with a difference of 31.4% in the frequency of selection.

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Benchmarking recent advances and innovative technology approaches of Fenton, photo-Fenton, electro-Fenton, and related processes: A review on the relevance of phenol as model molecule

Cited by 285 publications

References 241 publications

Niobium Oxide Catalysts as Emerging Material for Textile Wastewater Reuse: Photocatalytic Decolorization of Azo Dyes

Niobium Oxide Catalysts as Emerging Material for Textile Wastewater Reuse: Photocatalytic Decolorization of Azo Dyes

Arsenic Removal by Advanced Electrocoagulation Processes: The Role of Oxidants Generated and Kinetic Modeling

Multi-criteria analysis for the selection of advanced oxidation technologies in the treatment of emerging pollutants

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