Role of precursors on the photophysical properties of carbon nitride and its application for antibiotic degradation

Panneri, Suyana; Ganguly, Priyanka; Nair, Balagopal N.; Mohamed, Abdul Azeez Peer; Warrier, K. G. K.; Hareesh, U. S.

doi:10.1007/s11356-017-8538-z

Cited by 84 publications

(29 citation statements)

References 43 publications

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“…Bulk g-C 3 N 4 has an adsorption band at about 474 nm (Fig. 5a), which is similar to the previous report [32]. The adsorption edge of S-g-C 3 N 4 and SH-g-C 3 N 4 , however, show an obvious blueshift to 460 nm and 456 nm, respectively.…”

Section: Optical and Electrochemical Propertiessupporting

confidence: 89%

Protonated supramolecular complex-induced porous graphitic carbon nitride nanosheets as bifunctional catalyst for water oxidation and organic pollutant degradation

Wei

Huang

et al. 2019

J Mater Sci

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Polymeric graphitic carbon nitride (g-C 3 N 4 ) materials are promising catalysts to compete with precious metals, but they mostly only show moderate catalytic activity, particularly low oxidation power for oxygen evolution reaction (OER). Although activating strategies, such as nanostructure designing and band structure engineering, have led to remarkable activity gains, there remains considerable room to improve performance that aims for real applications. We report here a novel strategy-protonating supramolecular aggregates followed by thermal polycondensation-to prepare porous g-C 3 N 4 nanosheets (SH-g-C 3 N 4 ) with high oxidation power, which employ as bifunctional OER catalyst and highly efficient photocatalyst material. The OER onset potentials of 1.47 V and Tafel slope of 128 mV dec -1 over SH-g-C 3 N 4 are superior to the g-C 3 N 4 obtained from supramolecular aggregates without protonation (S-g-C 3 N 4 ). Furthermore, its Tafel slope would be reduced to 63.6 mV dec -1 under visible light irradiation, which is comparable to that of the active commercial RuO 2 and IrO 2 catalysts. Interestingly, the achieved nanosheets display enhanced visible light photocatalytic activity. The striking catalysis performance of SH-g-C 3 N 4 can be ascribed to the unique advantage of its highly porous structure and favorable electronic structure and the generation of lots of ÁO 2 and ÁOH radicals promoting the kinetic process. Our theoretical calculations reveal the mechanism of photoelectric catalyst for oxygen evolution reaction. This work provides a facile and scalable method to design highly efficient polymeric catalysts.

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Section: Optical and Electrochemical Propertiessupporting

confidence: 89%

Protonated supramolecular complex-induced porous graphitic carbon nitride nanosheets as bifunctional catalyst for water oxidation and organic pollutant degradation

Wei

Huang

et al. 2019

J Mater Sci

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“…The significant requirement of water in different industries such as chemical, petrochemical, pharmaceutical, textile, paper, and printing industries lead to environmental destruction and threat of ecosystems because of discharge of highly toxic and non-biodegradable wastewater 3 . Moreover, excessive use of pharmaceuticals in recent years and subsequent discharge of pharmaceutical residues and effluents and harmful organic contaminants into the aquatic environment are important issues that need to be addressed seriously 1 , 4 .…”

Section: Introductionmentioning

confidence: 99%

“…Tetracycline (TC) antibiotics are one of the largest groups of widely used antibiotics worldwide in terms of production and consumption that were discovered in the 1940s 4 , 9 . The complex structure of TC, hydrophilicity of large molecules, solubility in the ranges of g/L, emission to the environment caused by poor absorption by humans and animals, and excretion of large amounts are the distinctive properties necessitate for efficient removal of it from wastewater that is practical through the photocatalytic processes 7 , 10 , 11 .…”

Section: Introductionmentioning

confidence: 99%

Synthesis and characterization of ternary chitosan–TiO2–ZnO over graphene for photocatalytic degradation of tetracycline from pharmaceutical wastewater

Patehkhor

Fattahi

Khosravi‐Nikou

2021

Sci Rep

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Various nanocomposites of TiO2–ZnO, TiO2–ZnO/CS, and TiO2–ZnO/CS–Gr with different molar ratios were synthesized by sol–gel and ultrasound-assisted methods and utilized under UV irradiation to enhance the photocatalytic degradation of tetracycline. Characterization of prepared materials were carried out by XRD, FT-IR, FE-SEM, EDX and BET techniques. The TiO2–ZnO with the 1:1 molar ratio supported with 1:2 weight ratio CS–Gr (T1‒Z1/CS1‒Gr2 sample) appeared as the most effective material at the optimized operational conditions including the tetracycline concentration of 20 mg/L, pH = 4, catalyst dosage of 0.5 g/L, and 3 h of irradiation time. As expected, the graphene had a significant effect in improving degradation results. The detailed performances of the T1‒Z1/CS1‒Gr2 were compared with ternary nanocomposites from EDX and BET results as well as from the degradation viewpoint. This novel photocatalyst can be effective in actual pharmaceutical wastewater treatment considering the applied operational parameters.

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“…Elemental doping, morphological tailoring in the form of nanotubes and fibers, making composites out of new 2-D materials like graphene, C 3 N 4 , are some of the efficient techniques to overcome these limitations [17][18][19][20]. Earlier studies on heterojunctions of anatase-rutile and anatase-brookite for photocatalytic applications have been reported.…”

Section: Introductionmentioning

confidence: 99%

Cu-Doped TiO2: Visible Light Assisted Photocatalytic Antimicrobial Activity

et al. 2018

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Surface contamination by microbes is a major public health concern. A damp environment is one of potential sources for microbe proliferation. Smart photocatalytic coatings on building surfaces using semiconductors like titania (TiO2) can effectively curb this growing threat. Metal-doped titania in anatase phase has been proven as a promising candidate for energy and environmental applications. In this present work, the antimicrobial efficacy of copper (Cu)-doped TiO2 (Cu-TiO2) was evaluated against Escherichia coli (Gram-negative) and Staphylococcus aureus (Gram-positive) under visible light irradiation. Doping of a minute fraction of Cu (0.5 mol %) in TiO2 was carried out via sol-gel technique. Cu-TiO2 further calcined at various temperatures (in the range of 500–700 °C) to evaluate the thermal stability of TiO2 anatase phase. The physico-chemical properties of the samples were characterized through X-ray diffraction (XRD), Raman spectroscopy, X-ray photo-electron spectroscopy (XPS) and UV–visible spectroscopy techniques. XRD results revealed that the anatase phase of TiO2 was maintained well, up to 650 °C, by the Cu dopant. UV–vis results suggested that the visible light absorption property of Cu-TiO2 was enhanced and the band gap is reduced to 2.8 eV. Density functional theory (DFT) studies emphasize the introduction of Cu+ and Cu2+ ions by replacing Ti4+ ions in the TiO2 lattice, creating oxygen vacancies. These further promoted the photocatalytic efficiency. A significantly high bacterial inactivation (99.9999%) was attained in 30 min of visible light irradiation by Cu-TiO2.

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Role of precursors on the photophysical properties of carbon nitride and its application for antibiotic degradation

Cited by 84 publications

References 43 publications

Protonated supramolecular complex-induced porous graphitic carbon nitride nanosheets as bifunctional catalyst for water oxidation and organic pollutant degradation

Protonated supramolecular complex-induced porous graphitic carbon nitride nanosheets as bifunctional catalyst for water oxidation and organic pollutant degradation

Synthesis and characterization of ternary chitosan–TiO2–ZnO over graphene for photocatalytic degradation of tetracycline from pharmaceutical wastewater

Cu-Doped TiO2: Visible Light Assisted Photocatalytic Antimicrobial Activity

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