Synthesis of TiO 2 visible light catalysts with controllable crystalline phase and morphology from Ti-bearing electric arc furnace molten slag

Li, Yang; Liu, Lulu; Guo, Min; Zhang, Mei

doi:10.1016/j.jes.2015.11.032

Cited by 11 publications

(6 citation statements)

References 25 publications

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“…The first weight loss at 25–150 °C was due to loss of moisture . Another weight loss observed from 180 to 700 °C was due to loss of low molecular weight oligomers of PANI . After 700 °C, there was no weight loss observed for the nanocomposite because of the stability of TiO 2 , which was incorporated into PANI to form a nanocomposite.…”

Section: Resultsmentioning

confidence: 99%

“…Several catalysts have been reported in the literature for the photodegradation of BPA. − Taking into consideration the TiO 2 properties, including strong oxidizing power, large surface area, corrosion resistance, nontoxicity, and cost effectiveness, this semiconductor has been widely used as a photocatalyst for the degradation of organic pollutants. , However, its application has been hindered by the high recombination rate of the electron–hole pairs . Surface modification of TiO 2 with a polyaniline (PANI)-conducting polymer has been reported to alleviate this challenge by effecting charge separation.…”

Section: Introductionmentioning

confidence: 99%

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Polyaniline-Coated TiO₂Nanorods for Photocatalytic Degradation of Bisphenol A in Water

2020

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Polyaniline (PANI)-wrapped TiO2 nanorods (PANI/TiO2), obtained through the oxidative polymerization of aniline at the surface of hydrothermally presynthesized TiO2 nanorods, were evaluated as photocatalysts for the degradation of Bisphenol A (BPA). Fourier-transform infrared spectroscopy analysis revealed the successful incorporation of PANI into TiO2 by the appearance of peaks at 1577 and 1502 cm–1 that are due to the CC and C–N stretch of the benzenoid or quinoid ring in PANI. Brunauer–Emmett–Teller analysis revealed that PANI/TiO2 had almost double the surface area of TiO2 (44.8999 m2/g vs 28.2179 m2/g). Transmission electron microscopy (TEM) analysis showed that TiO2 nanorods with different diameters were synthesized. The TEM analysis showed that a thin layer of PANI wrapped the TiO2 nanorods. X-ray photon spectroscopy survey scan of the PANI/TiO2 nanocomposite revealed the presence of C, O, Ti, and N. Photocatalytic activity evaluation under UV radiation through the effect of key parameters, including pH, contact time, dosage, and initial concentration of BPA, was carried out in batch studies. Within 80 min, 99.7% of 5 ppm BPA was attained using the 0.2 g/L PANI/TiO2 photocatalyst at pH 10. The quantum yield (QY) of these photocatalysts was evaluated to be 9.86 × 10–5 molecules/photon and 2.82 × 10–5 molecules/photon for PANI/TiO2 and TiO2, respectively. PANI/TiO2 showed better performance than as-synthesized TiO2 with a rate constant of 4.46 × 10–2 min–1 compared to 2.18 × 10–2 min–1. The rate of degradation of PANI/TiO2 was also superior to that of TiO2 (150 mmol/g/h vs 74.89 mmol/g/h). Nitrate ions increased the rate of degradation of BPA, while humic acid consistently inhibited the degradation of BPA. LC–MS analysis identified degradation products with m/z 213.1, 135.1, and 93.1. The PANI/TiO2 nanocomposite was reused up to five cycles with a removal of at least 80% in the fifth cycle. LC–MS results revealed three possible BPA degradation intermediates. LC–MS analysis identified degradation products which included protonated BPA, [C14H13O2 +], and [C9H11O+]. The PANI/TiO2 nanocomposite demonstrated superior photocatalytic activity with respect to improved QY and figure of merit and lower energy consumption.

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Section: Resultsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Polyaniline-Coated TiO₂Nanorods for Photocatalytic Degradation of Bisphenol A in Water

2020

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“…It was found that acidolysis at very low pH (0.05) produces nanorod rutile particles which were active as a photocatalyst in the visible spectrum, due to doping of the rutile phase by Fe and Si which are present as impurities in the process [73]. At higher pH values, a mixture of anatase and rutile was obtained which also showed a lower specific surface area [74]. The authors successfully treated contaminants such as rhodamine and methylene blue [75].…”

Section: Photocatalysis Based On Ferrous Slagmentioning

confidence: 99%

Metallurgical Wastes Employed as Catalysts and Photocatalysts for Water Treatment: A Review

et al. 2019

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Metallurgical slags are a mass-produced industrial solid waste, often destined to landfills; the volumes disposed represent an environmental burden. Over the last three decades, applications have been found for these wastes, mainly as a low-cost additive in building materials. More recently, their unique chemical properties have attracted attention to produce high-added-value materials for environmental applications, to be used as adsorbents, catalysts, or a source of reactive species in environmental engineering. Such uses can be classified as a function of the added value generated, technological complexity, and environmental impact. This review will focus specifically on the modification and use of slags for catalysis, photocatalysis, and photocatalytic production of hydrogen, which have received relatively little attention in literature. A summary will be presented about the general requirements for using unmodified slags as well as slag processed under alkaline or acidic conditions for advanced oxidation processes. Then, an overview will be given of the use of slags as photocatalysts in water treatment, organized according to the origin of the product (steel, copper, magnesium, ferromanganese), as well as emerging reports on the photocatalytic production of hydrogen, in contrast to the use of highly specific titania-based products developed for the same purpose.

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“…Nanostructured TiO 2 photocatalysts have received considerable attention in recent decades because they can be used in energy and environmental fields. − However, some weaknesses remain in the practical application of nanostructured TiO 2 photocatalysts, for example, (1) low usage of solar energy and low quantum yield and (2) high cost because the cost of expensive chemical reagents usually used in the laboratory for preparing TiO 2 . − To overcome such problems, this work proposed using spent V 2 O 5 –WO 3 /TiO 2 catalysts as a secondary raw material. The mass fraction of the TiO 2 component is >80% in the spent V 2 O 5 –WO 3 /TiO 2 catalysts.…”

Section: Introductionmentioning

confidence: 99%

Sustainable Approach for Spent V₂O₅–WO₃/TiO₂ Catalysts Management: Selective Recovery of Heavy Metal Vanadium and Production of Value-Added WO₃–TiO₂ Photocatalysts

Zhang

et al. 2018

ACS Sustainable Chem. Eng.

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In order to control nitrogen oxides emissions, V2O5–WO3/TiO2 catalysts are widely applied in coal-fired power plants. Consequently, a large number of V2O5–WO3/TiO2 catalysts are spent annually because of their short operating life. Although these spent catalysts contain amounts of heavy metals, they have also been regarded as a potential secondary resource for the recovery of valuable elements titanium, tungsten, and vanadium. Therefore, this study developed an efficient method for selective leaching of heavy metal vanadium with an “H2SO4 + Na2SO3” acid reduction system. The use of this leaching solution achieved nearly 100% efficiency in vanadium removal, and the effects of the leaching parameters on the vanadium leaching efficiencies were investigated. Subsequently, the titanium-enriched residue obtained from the leaching process was used to produce high-performance WO3–TiO2 photocatalysts with dominant {001} facets via a hydrothermal treatment. The influence of the amount of hydrogen fluoride on the morphology and percentage exposure of the {001} facets of the photocatalysts was studied systematically. The method proposed in this study constitutes a novel and sustainable approach for the disposal of spent V2O5–WO3/TiO2 catalysts.

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Synthesis of TiO 2 visible light catalysts with controllable crystalline phase and morphology from Ti-bearing electric arc furnace molten slag

Cited by 11 publications

References 25 publications

Polyaniline-Coated TiO₂Nanorods for Photocatalytic Degradation of Bisphenol A in Water

Polyaniline-Coated TiO₂Nanorods for Photocatalytic Degradation of Bisphenol A in Water

Metallurgical Wastes Employed as Catalysts and Photocatalysts for Water Treatment: A Review

Sustainable Approach for Spent V₂O₅–WO₃/TiO₂ Catalysts Management: Selective Recovery of Heavy Metal Vanadium and Production of Value-Added WO₃–TiO₂ Photocatalysts

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Synthesis of TiO 2 visible light catalysts with controllable crystalline phase and morphology from Ti-bearing electric arc furnace molten slag

Cited by 11 publications

References 25 publications

Polyaniline-Coated TiO2Nanorods for Photocatalytic Degradation of Bisphenol A in Water

Polyaniline-Coated TiO2Nanorods for Photocatalytic Degradation of Bisphenol A in Water

Metallurgical Wastes Employed as Catalysts and Photocatalysts for Water Treatment: A Review

Sustainable Approach for Spent V2O5–WO3/TiO2 Catalysts Management: Selective Recovery of Heavy Metal Vanadium and Production of Value-Added WO3–TiO2 Photocatalysts

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Product

Resources

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Polyaniline-Coated TiO₂Nanorods for Photocatalytic Degradation of Bisphenol A in Water

Polyaniline-Coated TiO₂Nanorods for Photocatalytic Degradation of Bisphenol A in Water

Sustainable Approach for Spent V₂O₅–WO₃/TiO₂ Catalysts Management: Selective Recovery of Heavy Metal Vanadium and Production of Value-Added WO₃–TiO₂ Photocatalysts