Titanium dioxide and graphitic carbon nitride–based nanocomposites and nanofibres for the degradation of organic pollutants in water: a review

Ratshiedana, Rudzani; Kuvarega, Alex T.; Mishra, Ajay Kumar

doi:10.1007/s11356-020-11987-3

Cited by 34 publications

(18 citation statements)

References 139 publications

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“…Novel brominated flame retardants exist widely in the environment alongside many other pollutants, which may alter their environmental behavior, bioavailability, and biotoxicity in organisms (Zheng et al, 2018;Wu et al, 2020b;Ratshiedana et al, 2021). In the present study, we evaluated the effects of n-TiO 2 on the properties of DBDPE in aqueous solution, including the accumulation, metabolism, and potential toxicity of DBDPE in zebrafish embryos/larvae.…”

Section: Discussionmentioning

confidence: 99%

Nano-TiO2 Adsorbed Decabromodiphenyl Ethane and Changed Its Bioavailability, Biotransformation and Biotoxicity in Zebrafish Embryos/Larvae

Wang

Sun

et al. 2022

Front. Environ. Sci.

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Decabromodiphenyl ethane (DBDPE), a novel brominated flame retardant, may co-exist with other pollutants including nanoparticles (NPs) in aquatic environment. Due to structural similarity with decabromodiphenyl ether, DBDPE has been reported to exhibit thyroid disrupting effects and neurotoxicity. This study further evaluated the behavior of DBDPE in aqueous environments along with the bioavailability and toxicity of DBDPE in aquatic organisms in the presence of TiO2 nanoparticles (n-TiO2). When co-existing in an aqueous environment, DBDPE was adsorbed by n-TiO2, potentially facilitating the sedimentation of DBDPE from the aqueous phase. Co-exposure to DBDPE and n-TiO2 significantly increased the uptake of DBDPE by zebrafish (Danio rerio) embryos and altered the composition of metabolites in zebrafish larvae compared to zebrafish exposed to DBDPE alone. The DBDPE-induced increases in heart rate, tail bending frequency, average speed under dark/light stimulation, and thyroid hormone levels in zebrafish embryos/larvae were further enhanced in the presence of n-TiO2. Overall, the results demonstrate that n-TiO2 affected the behavior of DBDPE in the aqueous phase and increased the bioavailability and biotoxicity of DBDPE in zebrafish embryos/larvae. These results could be helpful for understanding the environmental behavior and toxicity of DBDPE.

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Section: Discussionmentioning

confidence: 99%

Nano-TiO2 Adsorbed Decabromodiphenyl Ethane and Changed Its Bioavailability, Biotransformation and Biotoxicity in Zebrafish Embryos/Larvae

Wang

Sun

et al. 2022

Front. Environ. Sci.

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“…Various modification strategies have been employed in g-C 3 N 4 materials to improve the photocatalytic efficiency, which is inhibited by the high rate of e − –h + recombination process and low charge mobility, the inability to absorb visible light below 460 nm, low surface area, and limited interfacial interactions [ 36 ]. Some of these strategies include heterojunction fabrication [ 17 , 22 , 37 , 38 ], metal doping [ 19 ], non-metal doping [ 39 ], and structural defect engineering [ 22 , 34 ].…”

Section: Properties Of G-c 3 Nmentioning

confidence: 99%

“…These review articles were mainly concerned with the synthesis and design of g-C 3 N 4 and g-C 3 N 4 -based nanomaterials, their photocatalytic mechanisms, structural modifications, and the development of energy and environmental applications, such as the effective conversion of solar energy to generate H 2 through water splitting; energy conversion and storage; sensors; solar cells; fuel cells; supercapacitors; the photoreduction of CO 2 ; the removal of NO x ; selective organic transformations; the photocatalytic degradation of various pollutants from wastewater, soil, and air; and bacterial disinfection ( Figure 3 ) [ 5 , 6 , 7 , 8 , 9 , 10 , 11 , 12 , 13 , 14 , 15 , 16 , 17 , 18 , 19 ]. Design strategies for biological applications, biosensors, and electrochemical devices were also discussed in detail [ 15 , 16 , 17 , 20 , 21 ].…”

Section: Introductionmentioning

confidence: 99%

Graphitic Carbon Nitride as a New Sustainable Photocatalyst for Textile Functionalization

2021

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As a promising organic semiconducting material, polymeric graphitic carbon nitride (g-C3N4) has attracted much attention due to its excellent optical and photoelectrochemical properties, thermal stability, chemical inertness, nontoxicity, abundance, and low cost. Its advantageous visible light-induced photocatalytic activity has already been beneficially used in the fields of environmental remediation, biological applications, healthcare, energy conversion and storage, and fuel production. Despite the recognized potential of g-C3N4, there is still a knowledge gap in the application of g-C3N4 in the field of textiles, with no published reviews on the g-C3N4- functionalization of textile materials. Therefore, this review article aims to provide a critical overview of recent advances in the surface and bulk modification of textile fibres by g-C3N4 and its composites to tailor photocatalytic self-cleaning, antibacterial, and flame retardant properties as well as to create a textile catalytic platform for water disinfection, the removal of various organic pollutants from water, and selective organic transformations. This paper highlights the possibilities of producing g-C3N4-functionalized textile substrates and suggests some future prospects for this research area.

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“…A strategy to immobilize photocatalysts is based on an electrospinning process. Electrospun fibers offer a range of advantages compared to traditional substrates composed of metal or glass, namely a higher surface area, flexibility and the potential application as filter medium [33][34][35]. The electrospinning process allows the formation of continuous fibers with a controlled diameter and orientation and provides access even to large area fleeces [34].…”

Section: Introductionmentioning

confidence: 99%

Photocatalytic water purification under visible light using carbon nitride materials and β-Bi2O3 immobilized on electrospun polyvinyl acetate fibers

Köwitsch¹,

Schäfer²,

Hornig³

et al. 2022

SN Appl. Sci.

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We report on the immobilization of carbon nitride (CN) materials and β-Bi2O3 on electrospun polyvinyl acetate (PVAc) fiber substrates using a dispersion based dip coating process. The spinning process was optimized by variation of several parameters to finally obtain continuous droplet-free fibers at 15 kV and a flow rate of 50 µL min−1 using a needle with 1.2 mm diameter. The polymer substrates were coated with the β-Bi2O3 and CN materials, which were characterized using SEM and applied in the photocatalytic degradation of organic pollutants such as Rhodamine B (RhB), ethinyl estradiol (EE2) and triclosan using visible light irradiation. The pollutants were degraded with up to 50% of the initial concentration within 8 h. Different amounts of CN material were deposited to evaluate the photocatalytic activity per mass. Immobilized CN materials were shown to be of higher activity (2.0 × 10−10 mol mg−1 min−1) than β-Bi2O3 (1.3 × 10−10 mol mg−1 min−1) and the mixture CN/β-Bi2O3 (1.6 × 10−10 mol mg−1 min−1). Reference samples with CN particles partially embedded in the polymer fleece showed minor degradaton rates (18% RhB degradation within 8 h) as compared to coated fiber substrates (47% RhB degradation within 8 h). Minor leaching of the carbon nitride material and no leaching of β-Bi2O3 occurs as shown by NPOC (non purgeable organic carbon) and ICP-MS measurements.

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Titanium dioxide and graphitic carbon nitride–based nanocomposites and nanofibres for the degradation of organic pollutants in water: a review

Cited by 34 publications

References 139 publications

Nano-TiO2 Adsorbed Decabromodiphenyl Ethane and Changed Its Bioavailability, Biotransformation and Biotoxicity in Zebrafish Embryos/Larvae

Nano-TiO2 Adsorbed Decabromodiphenyl Ethane and Changed Its Bioavailability, Biotransformation and Biotoxicity in Zebrafish Embryos/Larvae

Graphitic Carbon Nitride as a New Sustainable Photocatalyst for Textile Functionalization

Photocatalytic water purification under visible light using carbon nitride materials and β-Bi2O3 immobilized on electrospun polyvinyl acetate fibers

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