UV light activated g-C3N4 nanoribbons coated surface acoustic wave sensor for high performance sub-ppb level NO2 detection at room temperature

Pasupuleti, Kedhareswara Sairam; Vidyasagar, Devthade; Ambadi, Lakshmi Narayana; Bak, Na-hyun; Kim, Song-Gang; Kim, Moon‐Deock

doi:10.1016/j.snb.2023.134471

Cited by 23 publications

(3 citation statements)

References 49 publications

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“…A possible photocatalytic mechanism of CNM (1:2) removal Cr (VI) is shown in Figure 10. Additionally, the figure shows that under the excitation of light, a large number of electron and hole pairs are generated on the surface of photocatalysts, which greatly increases the activity of the photocatalyst for pollutant removal [54]. The band gap of CNM (1:2) was significantly narrower than that of the g-C 3 N 4 and MoS 2 , which is due to the photoexcited electrons' (e − ) transition from the conduction band (CB) of g-C 3 N 4 to the CB of MoS 2 , and the holes' (h + ) transition from the valence band (VB) of MoS 2 to the VB of g-C 3 N 4 , which is beneficial to the narrowing of the band gap and reduces the recombination rate of photo-generated electrons and holes.…”

Section: Mechanisms Of Photocatalysismentioning

confidence: 99%

Visible Light Photoactivity of g-C3N4/MoS2 Nanocomposites for Water Remediation of Hexavalent Chromium

Tian,

Yu,

Zhai

et al. 2024

Molecules

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Water pollution has becoming an increasingly serious issue, and it has attracted a significant amount of attention from scholars. Here, in order remove heavy metal hexavalent chromium (Cr (VI)) from wastewater, graphitic carbon nitride (g-C3N4) was modified with molybdenum disulfide (MoS2) at different mass ratios via an ultrasonic method to synthesize g-C3N4/MoS2 (CNM) nanocomposites as photocatalysts. The nanocomposites displayed efficient photocatalytic removal of toxic hexavalent chromium (Cr (VI)) from water under UV, solar, and visible light irradiation. The CNM composite with a 1:2 g-C3N4 to MoS2 ratio achieved optimal 91% Cr (VI) removal efficiency at an initial 20 mg/L Cr (VI) concentration and pH 3 after 120 min visible light irradiation. The results showed a high pH range and good recycling stability. The g-C3N4/MoS2 nanocomposites exhibited higher performance compared to pure g-C3N4 due to the narrowed band gap of the Z-scheme heterojunction structure and effective separation of photo-generated electron–hole pairs, as evidenced by structural and optical characterization. Overall, the ultrasonic synthesis of g-C3N4/MoS2 photocatalysts shows promise as an efficient technique for enhancing heavy metal wastewater remediation under solar and visible light.

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Section: Mechanisms Of Photocatalysismentioning

confidence: 99%

Visible Light Photoactivity of g-C3N4/MoS2 Nanocomposites for Water Remediation of Hexavalent Chromium

Tian,

Yu,

Zhai

et al. 2024

Molecules

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“…Synthesizing a hybrid catalyst with other semiconductors with narrow band gaps is desirable to overcome such restrictions [ 25 , 26 ]. Among others, hybrid materials-based carbon nanomaterials such as carbon, carbon nitride (g-C 3 N 4 ), etc., with excited properties including good catalyst support, chemical stability, and nontoxicity, can be combined with NiO to improve the catalytic properties in the visible light region [ 27 , 28 ]. In addition, carbon and C 3 N 4 can be fabricated with low-cost and naturally abundant precursors [ 29 ].…”

Section: Introductionmentioning

confidence: 99%

Integrated Ozonation Ni-NiO/Carbon/g-C3N4 Nanocomposite-Mediated Catalytic Decomposition of Organic Contaminants in Wastewater under Visible Light

Alhato,

Kumar,

Barakat

2024

Nanomaterials

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Developing a hybrid process for wastewater purification is of utmost importance to make conventional methods more efficient and faster. Herein, an effective visible light-active nickel–nickel oxide/carbon/graphitic carbon nitride (Ni-NiO/C/g-C3N4)-based nanocatalyst was developed. A hybrid process based on ozonation and Ni-NiO/C/g-C3N4 visible light photocatalysis was applied to decolourize the Congo red (CR), Alizarin Red S (ARS), and real dairy industry wastewater. The synthesized catalyst was characterized using scanning electron microscopy (SEM), energy dispersive X-ray spectroscopy (EDX), Χ-ray powder diffraction (XRD), X-ray photoelectron spectroscopy (XPS), and UV-Vis diffuse reflectance spectrophotometry (UV-Vis DRS). The factors affecting the catalytic process were evaluated, including contact time, solution pH, initial dye concentration, etc. The degradation rate of CR and ARS was compared between the photocatalysis, ozonation, and integrated photocatalytic ozonation (PC/O3) methods. The results showed 100% degradation of CR and ARS within 5 min and 40 min, respectively, by integrated PC/O3. The reusability of the modified catalyst was evaluated, and four successive regenerations were achieved. The modified Ni-NiO/C/g-C3N4 composite could be considered an effective, fast, and reusable catalyst in an integrated PC/O3 process for the complete decolourization of wastewater.

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“…The optical gas sensor (OGS) is a type of device that can provide information about the composition and concentration of gaseous analytes in the air [1,2]. The interaction of the optical sensor with the gaseous analyte produces change in 3 www.ref-n-write.com * Author to whom any correspondence should be addressed the optical parameters (absorbance, reflection, fluorescence, chemiluminescence, scattering, refraction or polarized light) [3]. It has been recognized that OGS must be quickly responsive, highly sensitive and selective, as well as stable and easy to modify in its applications including environmental monitoring, food safety testing and clinical disease diagnosis [4,5].…”

Section: Introductionmentioning

confidence: 99%

Fast fabrication, gas sense characteristics and kinetics of cubic Ti-BIPA-TC-MOF film composite optical waveguides

Nizamidin,

Chen,

Mamtmin

et al. 2024

J. Phys. D: Appl. Phys.

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A cubic Ti-MOF ([Ti2-(TpA)2-H2BIPA]), constructed from a titanium metal center and a benzo-imidephenanthroline tetracarboxylic acid (H4BIPA-TC) ligand was photo-inductively grown on the surface of a titanium dioxide (TiO2) composite optical waveguide (COWG) substrate and the influence of photo-inductive growth period on the [Ti2-(TpA)2-H2BIPA] film surface morphology, optical properties and gas adsorption/sensing characteristics was investigated. The results showed that [Ti2-(TpA)2-H2BIPA] formed a cubic structure after grew for only 5 minutes. As an ideal gas adsorbent, it exhibits a specific response to ethylenediamine (EDA) among various benzene, amine and acid gases, due to the intrinsic electron deficiency, rich COOH active sites of the Ti-BIPA-TC-MOF-5 frame and the higher molar refractive indexes (RDs) or dipoles of EDA than other gases. In the EDA concentration range from 10 ppt to 100 ppm, the Ti-BIPA-TC-MOF-5 film COWG exhibited a rapid, repeatable response. Moreover, the Ti-BIPA-TC-MOF-5 film COWG was relatively stable, within 17 days of EDA detection, the response intensity was almost constant and slightly decreased within 40 days. In a static gas adsorption stage at 283-313 K, the EDA gas adsorption behaviour of the Ti-BIPA-TC-MOF-5 film is consistent with the pseudo-second-order (PSO) kinetic model.

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UV light activated g-C3N4 nanoribbons coated surface acoustic wave sensor for high performance sub-ppb level NO2 detection at room temperature

Cited by 23 publications

References 49 publications

Visible Light Photoactivity of g-C3N4/MoS2 Nanocomposites for Water Remediation of Hexavalent Chromium

Visible Light Photoactivity of g-C3N4/MoS2 Nanocomposites for Water Remediation of Hexavalent Chromium

Integrated Ozonation Ni-NiO/Carbon/g-C3N4 Nanocomposite-Mediated Catalytic Decomposition of Organic Contaminants in Wastewater under Visible Light

Fast fabrication, gas sense characteristics and kinetics of cubic Ti-BIPA-TC-MOF film composite optical waveguides

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