The first comprehensive safety study of Magnéli phase titanium suboxides reveals no acute environmental hazard

Kokalj, Anita Jemec; Novak, Sara; Talaber, Iva; Kononenko, Veno; Mali, Lilijana Bizjak; Vodovnik, Maša; Žegura, Bojana; Eleršek, Tina; Kalčíková, Gabriela; Gotvajn, Andreja Žgajnar; Kralj, Slavko; Makovec, Darko; Čaloudová, Hana; Drobne, Damjana

doi:10.1039/c8en01119b

Cited by 7 publications

(3 citation statements)

References 40 publications

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“…The Magnely phases have remarkable properties as high electrical conductivity, high corrosion resistance, and optical properties, among others (Harada, Tanaka, & Inui, 2010; Ioroi et al, 2008; Lu et al, 2011). Recently, Jemec Kokalj et al (2019) evaluated the environmental hazard of titanium suboxides on six organisms and two human cell lines. They found that Magnely phases can be classified as nonhazardous material.…”

Section: Discussionmentioning

confidence: 99%

Effect of surface characteristics on the antibacterial properties of titanium dioxide nanotubes produced in aqueous electrolytes with carboxymethyl cellulose

Ocampo

Echeverry‐Rendón

DeAlba-Montero

et al. 2020

J Biomedical Materials Res

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Nanotubular structures were produced on a commercially pure titanium surface by anodization in an aqueous electrolyte that contained carboxymethyl cellulose and sodium fluoride. The internal diameters obtained were about 100, 48, and 9.5 nm, respectively. Several heat treatments at 200, 350, and 600 C were made to produce nanotubes with different titanium dioxide polymorphs (anatase, rutile). All tested surfaces were superhydrophilic, this behavior was maintained after at least 30 days, regardless of the heat treatment. Although in previous works the nanotube features effect on the bacteria behavior had been studied; this item still unclear. For the best of our knowledge, the effect of small internal diameters (about 10 nm) with and without heat treatment and with and without ultraviolet (UV) irradiation on the bacteria strains comportment has not been reported. From our results, both the internal diameter and the postanodized treatments have an effect on the bacteria strains comportment. All nanotubular coatings UV treated and heat treated at 350 and 600 C; despite they have different inner diameters, inhibit the bacteria growth of both Staphylococcus aureus and Pseudomonas aeruginosa strains. The nanotubular coatings obtained at 20 V and heat treated at 350 C produced the lower bacteria adhesion against both strains evaluated.

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Section: Discussionmentioning

confidence: 99%

Effect of surface characteristics on the antibacterial properties of titanium dioxide nanotubes produced in aqueous electrolytes with carboxymethyl cellulose

Ocampo

Echeverry‐Rendón

DeAlba-Montero

et al. 2020

J Biomedical Materials Res

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“…The following supporting information can be downloaded at , File S1: metadata for Figures S1–S4 (main text); Figure S5: 3-parameter log-logistic concentration–response model fittings of RGR frond ; Figure S6: 3-parameter log-logistic concentration–response model fittings of F v /F o ; Figure S7: 3-parameter log-logistic concentration–response model fittings of Y(II); and Table S1: The results of the 3-parameter log-logistic model fittings with calculated EC 20 and EC 50 values for the studied endpoints. References [ 62 , 63 , 64 , 65 , 66 , 67 , 68 , 69 , 70 , 71 , 72 , 73 , 74 , 75 , 76 , 77 , 78 , 79 , 80 , 81 , 82 , 83 , 84 , 85 , 86 , 87 , 88 , 89 , 90 , 91 , 92 , 93 , 94 , 95 , 96 , 97 , 98 , 99 , 100 , 101 , 102 , 103 , 104 , 105 , 106 , 107 , 108 , 109 ,…”

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confidence: 99%

Comparative Phytotoxicity of Metallic Elements on Duckweed Lemna gibba L. Using Growth- and Chlorophyll Fluorescence Induction-Based Endpoints

Irfan,

Mészáros,

Szabó

et al. 2024

Plants

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In this study, we exposed a commonly used duckweed species—Lemna gibba L.—to twelve environmentally relevant metals and metalloids under laboratory conditions. The phytotoxic effects were evaluated in a multi-well-plate-based experimental setup by means of the chlorophyll fluorescence imaging method. This technique allowed the simultaneous measuring of the growth and photosynthetic parameters in the same samples. The inhibition of relative growth rates (based on frond number and area) and photochemical efficiency (Fv/Fo and Y(II)) were both calculated from the obtained chlorophyll fluorescence images. In the applied test system, growth-inhibition-based phytotoxicity endpoints proved to be more sensitive than chlorophyll-fluorescence-based ones. Frond area growth inhibition was the most responsive parameter with a median EC50 of 1.75 mg L−1, while Fv/Fo, the more responsive chlorophyll-fluorescence-based endpoint, resulted in a 5.34 mg L−1 median EC50 for the tested metals. Ag (EC50 0.005–1.27 mg L−1), Hg (EC50 0.24–4.87 mg L−1) and Cu (EC50 0.37–1.86 mg L−1) were the most toxic elements among the tested ones, while As(V) (EC50 47.15–132.18 mg L−1), Cr(III) (EC50 6.22–19.92 mg L−1), Se(VI) (EC50 1.73–10.39 mg L−1) and Zn (EC50 3.88–350.56 mg L−1) were the least toxic ones. The results highlighted that multi-well-plate-based duckweed phytotoxicity assays may reduce space, time and sample volume requirements compared to the standard duckweed growth inhibition tests. These benefits, however, come with lowered test sensitivity. Our multi-well-plate-based test setup resulted in considerably higher median EC50 (3.21 mg L−1) for frond-number-based growth inhibition than the 0.683 mg L−1 median EC50 derived from corresponding data from the literature with standardized Lemna-tests. Under strong acute phytotoxicity, frond parts with impaired photochemical functionality may become undetectable by chlorophyll fluorometers. Consequently, the plant parts that are still detectable display a virtually higher average photosynthetic performance, leading to an underestimation of phytotoxicity. Nevertheless, multi-well-plate-based duckweed phytotoxicity assays, combined with chlorophyll fluorescence imaging, offer definite advantages in the rapid screening of large sample series or multiple species/clones. As chlorophyll fluorescence images provide information both on the photochemical performance of the test plants and their morphology, a joint analysis of the two endpoint groups is recommended in multi-well-plate-based duckweed phytotoxicity assays to maximize the information gained from the tests.

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“…[14][15][16] While issues of lead and antimony toxicity have limited the use of PbO 2 and ATO, the latter also exhibiting poor stability, 17 MPTOs are emerging as a viable alternative to BDD. MPTOs are nontoxic, 18 excellent electrical conductors whose single-crystal conductivity exceeds 1,000 S cm 1 , 19 dimensionally stable in aggressive media such as nitric and hydrofluoric acid, 20 and inexpensive at <0.5 USD m 2 . 12 Preliminary studies of the EO of wastewater impacted by synthetic organic dyes with MPTO electrodes demonstrate their effectiveness for decolorization and chemical oxygen demand (COD) removal.…”

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confidence: 99%

Vanadium-Doped Ti₄O₇ Porous Transport Layers for Efficient Electrochemical Oxidation of Industrial Wastewater Contaminants

English

Wilkinson

2023

J. Electrochem. Soc.

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Inexpensive electrode materials and effective cell designs are needed to advance electrochemical technologies for the oxidative treatment of wastewater. Novel vanadium-doped Ti4O7 porous transport layers (PTLs) used in a compact wastewater electrolyzer are developed and characterized and their performance for the electrochemical oxidation of synthetic wastewater is evaluated. An analytical model predicting performance with the apparent mass transfer coefficient and cell potential is developed. The influence of operating parameters such as volumetric flow, current density, and PTL composition on performance is investigated. Decolorization and chemical oxygen demand (COD) removal of 100 mg L−1 of methyl orange (MO), an azo dye, in 1,500 mgNaCl L−1 is rapid with mass transfer coefficients as great as 377 ± 24 µm s−1 for MO at 15 mA cm−2. After 2.5 Ah L−1 at 10 mA cm−2, >99% decolorization and >98% COD removal are achieved with a current efficiency of 19.2% and with specific and volumetric energy consumption of 120 and 84.1 kWh kg−1 for MO and COD, respectively, and 1.34 ± 0.09 and 6.45 ± 0.97 kWh m−3, respectively. A more energy-efficient electrochemical cell design for industrial wastewater treatment using less expensive high oxidation power electrode materials is demonstrated with these results.

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The first comprehensive safety study of Magnéli phase titanium suboxides reveals no acute environmental hazard

Abstract: This study provides the first evidence that the tested Magnéli TiOx are not acutely hazardous.

Cited by 7 publications

References 40 publications

Effect of surface characteristics on the antibacterial properties of titanium dioxide nanotubes produced in aqueous electrolytes with carboxymethyl cellulose

Effect of surface characteristics on the antibacterial properties of titanium dioxide nanotubes produced in aqueous electrolytes with carboxymethyl cellulose

Comparative Phytotoxicity of Metallic Elements on Duckweed Lemna gibba L. Using Growth- and Chlorophyll Fluorescence Induction-Based Endpoints

Vanadium-Doped Ti₄O₇ Porous Transport Layers for Efficient Electrochemical Oxidation of Industrial Wastewater Contaminants

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The first comprehensive safety study of Magnéli phase titanium suboxides reveals no acute environmental hazard

Abstract: This study provides the first evidence that the tested Magnéli TiOx are not acutely hazardous.

Cited by 7 publications

References 40 publications

Effect of surface characteristics on the antibacterial properties of titanium dioxide nanotubes produced in aqueous electrolytes with carboxymethyl cellulose

Effect of surface characteristics on the antibacterial properties of titanium dioxide nanotubes produced in aqueous electrolytes with carboxymethyl cellulose

Comparative Phytotoxicity of Metallic Elements on Duckweed Lemna gibba L. Using Growth- and Chlorophyll Fluorescence Induction-Based Endpoints

Vanadium-Doped Ti4O7 Porous Transport Layers for Efficient Electrochemical Oxidation of Industrial Wastewater Contaminants

Contact Info

Product

Resources

About

Vanadium-Doped Ti₄O₇ Porous Transport Layers for Efficient Electrochemical Oxidation of Industrial Wastewater Contaminants