g-C3N4/MoS2 Heterojunction for Photocatalytic Removal of Phenol and Cr(VI)

In this study, molybdenum disulfide (MoS2) decorated on graphitic carbon nitride (g-C3N4) heterostructure catalysts at various weight ratios (0.5%, 1%, 3%, 10%, w/w) were successfully prepared via a two-step hydrothermal synthesis preparation method. The properties of the synthesized materials were studied by X-ray diffraction (XRD), attenuated total reflectance–Fourier transform infrared spectroscopy (ATR-FT-IR), UV–Vis diffuse reflection spectroscopy (DRS), scanning electron microscopy (SEM) and N2 porosimetry. MoS2 was successfully loaded on the g-C3N4 forming heterojunction composite materials. N2 porosimetry results showed mesoporous materials, with surface areas up to 93.7 m2g−1, while determined band gaps ranging between 1.31 and 2.66 eV showed absorption over a wide band of solar light. The photocatalytic performance was evaluated towards phenol oxidation and of Cr (VI) reduction in single and binary systems under simulated sunlight irradiation. The optimum mass loading ratio of MoS2 in g-C3N4 was 1%, showing higher photocatalytic activity under simulated solar light in comparison with bare g-C3N4 and MoS2 for both oxidation and reduction processes. Based on scavenging experiments a type-II photocatalytic mechanism is proposed. Finally, the catalysts presented satisfactory stability (7.8% loss) within three catalytic cycles. Such composite materials can receive further applications as well as energy conversion.

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WO3 Fibers/g-C3N4 Z-Scheme Heterostructure Photocatalysts for Simultaneous Oxidation/Reduction of Phenol/Cr (VI) in Aquatic Media

Catalysts ◽

10.3390/catal11070792 ◽

2021 ◽

Vol 11 (7) ◽

pp. 792

Author(s):

Feidias Bairamis ◽

Ioannis Konstantinou

Keyword(s):

Binary Systems ◽

Energy Levels ◽

Light Illumination ◽

Diffuse Reflection Spectroscopy ◽

Energy Applications ◽

Simulated Solar Light ◽

Surface Areas ◽

Simultaneous Oxidation ◽

Improved Performance ◽

Single And Binary Systems

A sequence of WO3/g-C3N4 composites was synthesized at various % weight ratios (1, 5, 6.5, 8, 10, and 15%) of WO3 into g-C3N4 via electrospinning and wet-mixing method. The prepared photocatalytic materials were characterized by X-ray diffraction (XRD), Fourier transform-infrared (FT-IR) spectroscopy, UV–vis diffuse reflection spectroscopy (DRS), scanning electron microscopy (SEM), N2 porosimetry and dynamic light scattering (DLS). Electrospun fibers of WO3 with diameter 250–300 nm was prepared using polyvinylpyrrolidone (PVP) polymer and used for the synthesis of composite WO3/g-C3N4 heterojunction structures. Results showed mesoporous materials with triclinic WO3 crystal phase, surface areas up to 67.7 m2g−1 and band gaps lower than 2.5 eV confirming the absorption to visible light region. The photocatalytic performance of the prepared photocatalysts were assessed towards the oxidation of phenol and reduction of Cr (VI), in single and binary systems using simulated solar light illumination, that followed first-order kinetics. The WO3/g-C3N4 composites were found to exhibit improved photocatalytic performances compared to the pure WO3 and g-C3N4 with 6.5 wt% WO3/g-C3N4 and 5 wt% WO3/g-C3N4 composites being the most efficient catalysts for the oxidation of phenolics and reduction of Cr (VI), respectively. The improved performance was explained by a Z-scheme photocatalytic mechanism which was proposed based on scavenging experiments and the determination of the corresponding energy levels of valence and conduction bands. The study demonstrated that such composites present interesting photocatalytic properties that can be further expanded to other environmental depollution applications as well as in energy applications.

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Photocatalytic removal of benzene over Ti3C2Tx MXene and TiO2–MXene composite materials under solar and NIR irradiation

Journal of Materials Chemistry C ◽

10.1039/d1tc03826e ◽

2022 ◽

Author(s):

Sergii A. Sergiienko ◽

David M. Tobaldi ◽

Luc Lajaunie ◽

Daniela V. Lopes ◽

Gabriel Constantinescu ◽

...

Keyword(s):

Photocatalytic Activity ◽

Composite Materials ◽

Organic Pollutants ◽

Red Light ◽

Solar Light ◽

Simulated Solar Light ◽

Photocatalytic Removal ◽

Infra Red

The TiO2/MXene composites prepared by different routes were assessed towards the degradation of organic pollutants under simulated solar light. A notable photocatalytic activity of bare MXene under near infra-red light was discovered.

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Author response for "Adsorption performance of organic dyes in single and binary systems onto poly(itaconic acid)/magnetite sepiolite composite prepared via the green synthetic methods"

10.1002/cjce.24014/v2/response1 ◽

2020 ◽

Author(s):

Hucheng Ge ◽

Ze Zhang ◽

Xiaowei Zhao ◽

Hai Li ◽

Jingyi Sun ◽

...

Keyword(s):

Itaconic Acid ◽

Binary Systems ◽

Organic Dyes ◽

Synthetic Methods ◽

Author Response ◽

Adsorption Performance ◽

Single And Binary Systems

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TiO2-carbon microspheres as photocatalysts for effective remediation of pharmaceuticals under simulated solar light

Separation and Purification Technology ◽

10.1016/j.seppur.2021.119169 ◽

2021 ◽

pp. 119169

Author(s):

Manuel Peñas-Garzón ◽

Wael H.M. Abdelraheem ◽

Carolina Belver ◽

Juan J. Rodriguez ◽

Jorge Bedia ◽

...

Keyword(s):

Solar Light ◽

Carbon Microspheres ◽

Simulated Solar Light

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Titanium Nitride Nanodonuts Synthesized from Natural Ilmenite Ore as a Novel and Efficient Thermoplasmonic Material

Nanomaterials ◽

10.3390/nano11010076 ◽

2020 ◽

Vol 11 (1) ◽

pp. 76

Author(s):

Thanh-Lieu Thi Le ◽

Lam Tan Nguyen ◽

Hoai-Hue Nguyen ◽

Nguyen Van Nghia ◽

Nguyen Minh Vuong ◽

...

Keyword(s):

Titanium Nitride ◽

Low Cost ◽

Visible Region ◽

Resonance Absorption ◽

Solar Light ◽

Localized Surface Plasmon ◽

Water Evaporation ◽

Energy Applications ◽

Simulated Solar Light ◽

New Class

Nanostructures of titanium nitride (TiN) have recently been considered as a new class of plasmonic materials that have been utilized in many solar energy applications. This work presents the synthesis of a novel nanostructure of TiN that has a nanodonut shape from natural ilmenite ore using a low-cost and bulk method. The TiN nanodonuts exhibit strong and spectrally broad localized surface plasmon resonance absorption in the visible region centered at 560 nm, which is well suited for thermoplasmonic applications as a nanoscale heat source. The heat generation is investigated by water evaporation experiments under simulated solar light, demonstrating excellent solar light harvesting performance of the nanodonut structure.

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