Sub-stoichiometric titanium oxide (Ti4O7) as a suitable ceramic anode for electrooxidation of organic pollutants: A case study of kinetics, mineralization and toxicity assessment of amoxicillin

Ganiyu, Soliu O.; Oturan, Nihal; Raffy, Stéphane; Cretin, Marc; Esmilaire, Roseline; Hullebusch, Eric D. van; Esposito, Giovanni

doi:10.1016/j.watres.2016.09.056

Cited by 223 publications

(115 citation statements)

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“…The high membrane permeability (3200 L m À2 h À1 bar À1 ) resulted in a strong increase of the convective mass transport of pollutants from the bulk solution to electron-transfer sites at the surface and in the porosity of the material. The reactivity of the material has been investigated by using probe molecules (oxalic acid, coumarin, terephthalic acid) showing that both DET and formation of OH were involved in the oxidation of organic compounds Chaplin, 2013, 2014;Ganiyu et al, 2016). First studies on TiO x REM used either commercial Ebonex ® membranes (Walsh and Wills, 2010;Zaky and Chaplin, 2013) or TiO 2 ultrafiltration membranes reduced to Ti 4 O 7 under 1 atm H 2 during 50 h at 1050 C .…”

Section: Introductionmentioning

confidence: 99%

“…2e, f and 2g). None studies focused on the electrochemical performance of Ti 5 O 9 for organic compound oxidation but the most conductive Magn eli phase is known to be Ti 4 O 7 and recent studies demonstrated that this phase is able to produce OH from water oxidation Ganiyu et al, 2016Ganiyu et al, , 2017. Overall, physical characteristics of REM synthesized from carbothermal reduction of TiO 2 show that this material is tailored for water treatment applications, particularly for oxidation of organic pollutants.…”

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Mineralization of organic pollutants by anodic oxidation using reactive electrochemical membrane synthesized from carbothermal reduction of TiO2

et al. 2018

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OATAO is an open access repository that collects the work of Toulouse researchers and makes it freely available over the web where possible. This is an author-deposited version published in : http://oatao. Magn eli phases ensures the high reactivity of the membrane for organic compound oxidation through OH mediated oxidation and direct electron transfer. In cross-flow filtration mode, convection-enhanced mass transport of pollutants can be achieved from the high membrane permeability (3300 LMH bar À1 ). Mineralization efficiency of oxalic acid, paracetamol and phenol was assessed as regards to current density, transmembrane pressure and feed concentration. Unprecedented high removal rates of total organic carbon and mineralization current efficiency were achieved after a single passage through the REM, e.g. 47 g m À2 h À1 e 72% and 6.7 g m À2 h À1 e 47% for oxalic acid and paracetamol, respectively, at 15 mA cm À2. However, two mechanisms have to be considered for optimization of the process. When the TOC flux is too high with respect to the current density, aromatic compounds polymerize in the REM layer where only direct electron transfer occurs. This phenomenon decreases the oxidation efficiency and/or increases REM fouling. Besides, O 2 bubbles sweeping at high permeate flux promotes O 2 gas generation, with adverse effect on oxidation efficiency.

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Mineralization of organic pollutants by anodic oxidation using reactive electrochemical membrane synthesized from carbothermal reduction of TiO2

et al. 2018

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“…For example, Ganiyu et al (2016) [27] reported a complete degradation of 230 mL of 0.1 mM amoxicillin solution in 150, 120, 80 and 60 min when performing electrooxidation using BDD electrode at 10, 30, 60 and 120 mA, respectively ( Figure 4a). For example, Ganiyu et al (2016) [27] reported a complete degradation of 230 mL of 0.1 mM amoxicillin solution in 150, 120, 80 and 60 min when performing electrooxidation using BDD electrode at 10, 30, 60 and 120 mA, respectively ( Figure 4a).…”

Section: Reactive Oxygen Speciesmentioning

confidence: 99%

“…It has been reported that BDD( * OH) reacts very poorly with ammonia, [81] fulvic and humic acids [82] as well as ionic liquids. [27,41,85] It is a relatively weaker oxidant (E 0 = 1.65 vs SHE), [39] but it can achieve successful degradation of easily oxidizable organic pollutants with limited mineralization of recalcitrant oxidation intermediates. This radical is indirectly produced from the interaction between generated BDD( * OH) and in-situ electrogenerated H 2 O 2 at the cathode from two (2) electrons or partial reduction of dissolved oxygen (Eq.…”

Section: Reactive Oxygen Speciesmentioning

confidence: 99%

“…[24] For electrochemical wastewater treatment application, proper selection of substrate on which the thin film of BDD is deposited is imperative to ensure optimum electrochemical performance and abrasion resistance of the electrode. [26][27][28][29][30][31][32] Besides large volume of work that have been performed on electrooxidation of organic pollutants with BDD electrode, substantial reviews and some chapters of books which summarize the fundamental principles and application of BDD electrode for electrochemical wastewater treatment are available in the literatures. However, various studies have investigated other substrates such as Ta, Ti, W, Zr and C due to the fragility of Si, which makes it relatively non-ideal for industrial applications.…”

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Nature, Mechanisms and Reactivity of Electrogenerated Reactive Species at Thin‐Film Boron‐Doped Diamond (BDD) Electrodes During Electrochemical Wastewater Treatment

2019

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Electrooxidation of hazardous organic pollutants contaminating wastewater using thin-film boron-doped diamond (BDD) electrodes is an efficient and well-studied treatment technique. In this review, the three main reactive species, namely: reactive oxygen, chlorine and sulfate species, which can be electrogenerated and then participate in the oxidation processes during electrooxidative wastewater treatment using BDD electrodes, are discussed. The main factors affecting the nature and quantity of the electrogenerated reactive species, specifically the composition of the BDD electrode (doping level and sp 3 /sp 2 ratio) and the operating parameters (working current density and composition of water matrix been electrolyzed) were explained with relative examples. Extensive discussion on mode and reactivity of the three reactive species with organic pollutants during electrooxidation was provided and the future perspectives and direction of research on reactive species generated on BDD electrodes were also discussed.[a] Dr.

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Upcycling to Sustainably Reuse Plastics

et al. 2021

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The annual production is still growing and is expected to continue, meaning that it is imperative for us to plan for a future that will have even more plastics.Yet, the ubiquity of plastics has been recognized to be a double-edged sword. It was estimated that 8300 Mt of virgin plastics were produced between 1950 to 2015, but 6300 Mt of them had become plastic waste with 79% accumulated in landfills or the natural environment such as the waterways and the ocean. [1a] In 2015 alone, around 302 Mt or 74% of the annual production had become waste, with only 14% recycled, 14% combusted, and the remainder exposed to the environment (Table 1). [2] Over 8 Mt of plastics are believed to be added to the aquatic ecosystems every year since 2010, [3] with samples being discovered in some of the remotest marine ecosystems like the Mariana trench, including some dating as far back as 1957. [4] The increase in ocean plastics has been especially dramatic since the 1990s. [4a] Besides being potentially toxic by compromising the immune system in different organisms, plastics have also been found to disrupt global biogeochemical cycles such as nitrification and denitrification. [5] Furthermore, the enormous volumes of plastics being produced, converted, and disposed have been estimated to contribute almost 1800 Mt of CO 2 -equivalents (CO 2 e) in greenhouse gas (GHG) emissions in 2015, with the majority (61% or 1085 Mt) generated at the production stage, 30% or 535 Mt during conversion, and the remaining 9% or 161 Mt from the end of life disposal (Table 2). [6] Alarmingly, the current trajectory in growth of plastics consumption suggests that around 6500 Mt of CO 2 e in GHG emissions (15% of the global carbon budget) is expected by 2050. [6] In 2020, owing to the COVID-19 pandemic, even more plastic wastes are being generated due to increases in the use of food and other packaging materials, as well as the proliferation of single use disposal face masks. This has resulted in a surge in criminal recycling scams where plastic wastes from Europe and North America are being illegally exported to Asian countries to artificially inflate the recycling rates in the countries of origin. [7] Patently, more sustainable approaches are needed to manage the entire life cycle of plastics from production to end of life.To manage the inexorable growth of plastics production and waste, one strategy can be to adopt a zero waste hierarchy that was proposed by the European Commission's Waste Plastics are now indispensable in daily lives. However, the pollution from plastics is also increasingly becoming a serious environmental issue. Recent years have seen more sustainable approaches and technologies, commonly known as upcycling, to transform plastics into value-added materials and chemical feedstocks. In this review, the latest research on upcycling is presented, with a greater focus on the use of renewable energy as well as the more selective methods to repurpose synthetic polymers. First, thermal upcycling approaches are briefly introduced, inc...

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Sub-stoichiometric titanium oxide (Ti4O7) as a suitable ceramic anode for electrooxidation of organic pollutants: A case study of kinetics, mineralization and toxicity assessment of amoxicillin

Cited by 223 publications

References 61 publications

Mineralization of organic pollutants by anodic oxidation using reactive electrochemical membrane synthesized from carbothermal reduction of TiO2

Mineralization of organic pollutants by anodic oxidation using reactive electrochemical membrane synthesized from carbothermal reduction of TiO2

Nature, Mechanisms and Reactivity of Electrogenerated Reactive Species at Thin‐Film Boron‐Doped Diamond (BDD) Electrodes During Electrochemical Wastewater Treatment

Upcycling to Sustainably Reuse Plastics

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