Photoluminescence and photocatalytic studies of cadmium sulfide/multiwall carbon nanotube (CdS/MWCNT) nanocomposites

Banizi, Zoha Tavakoli; Seifi, Majid; Askari, Mohammad Bagher; Dehaghi, Sedigheh Bagheri; zadeh, Mohammad Hassan Ramezan

doi:10.1016/j.ijleo.2017.12.153

Cited by 34 publications

(8 citation statements)

References 41 publications

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“…Various nanoscale semiconductors can be developed through different synthesis techniques. Organic or inorganic pollutant materials can be removed by the application of ZnO, Fe 2 O 3 , TiO 2 , CdS and MoS 2 photocatalysis materials [6][7][8][9][10][11]. Currently, higher surface to volume ratio and quantum effects have boost the significance of nanomaterials in fields including pollution, smell prevention and renewable energies [12].…”

Section: Introductionmentioning

confidence: 99%

Effect of Ni doping on the structural, optical and photocatalytic activity of MoS₂, prepared by Hydrothermal method

Khan

Hasan

Bhatti

et al. 2020

Mater. Res. Express

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Transition metal dichalcogenides (TMDs) are promising materials for photocatalytic functions. In class of TMDs, MoS 2 is comprehensively explored as a co-catalyst due to the extraordinary activity for photocatalytic activity of organic dye degradation. But the catalytic activities of MoS 2 are generated through S ions on depiction edges. Also numerous of S ions existed on basal planes are catalytically inactive. The insertion of external metals in MoS 2 organism is extensive way for activation of basal planes surface to enhance concentration of catalytically active sites. For this purpose, nanoparticles of Nickel (Ni) doped MoS 2 are prepared by hydrothermal technique. Structural and morphological analysis are characterized by XRD and SEM, respectively. XRD results showed that Ni is completely doped into MoS 2 . SEM showed that pure MoS 2 has sheet like structure and Ni doped MoS 2 has mix disc and flower like structure. Band gap energy was observed in declining range of 2.30-1.76 eV. The photocatalytic activity of pure MoS 2 and Ni doped MoS 2 were evaluated by degrading MB and RhB dyes under UV light irradiation. MB dye degradation of MB was 71% for pure MoS 2 . For 1% to 5% Ni doping in MoS 2 , MB dye degradated from 85% to 96%. It means that MB dye degradation of MB was enhanced continuously by increasing the concentration of Ni doping. RhB dye degradation of RhB was 62% for pure MoS 2 . For 1% to 5% Ni doping in MoS 2 , the RhB dye degradated from 77% to 91%.

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Section: Introductionmentioning

confidence: 99%

Effect of Ni doping on the structural, optical and photocatalytic activity of MoS₂, prepared by Hydrothermal method

Khan

Hasan

Bhatti

et al. 2020

Mater. Res. Express

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“…[123] Since last few decades, a large number of CNTs based photocatalysts for CO 2 photoreduction, water splitting and pollutant oxidation have been fabricated including those coupled with oxides, carbides, sulfides, nitrides, and chalcogenides. [124,125] For example, CNTs/TiO 2 , [126][127][128][129] CNTs/Mo 2 C, [130,131] CNTs/CdS, [132][133][134] CNTs/g-C 3 N 4 , [135] etc., composite photocatalysts exhibited remarkably enhanced photoactivities for CO 2 conversion, water reduction and pollutant oxidation. CNTs based ternary composite photocatalysts also play a significant role in photocatalysis.…”

Section: Carbon Nanotubes (Cnts) Compositesmentioning

confidence: 99%

Recent Progress in the Synthesis and Applications of Composite Photocatalysts: A Critical Review

2021

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concentration for March 2021 was 417.14 parts per million (ppm), which is about 50% higher than the average for pre-industrial levels (i.e., 278 ppm). In order to control global warming, the CO 2 emission must fall by 25% to keep the temperature below 2 °C threshold relative to the pre-industrial climate. [3,4] Among the existing numerous renewable and sustainable energy resources such as wind, solar, hydropower, geo-thermal and ocean-energy, the consumption of unlimited solar energy become a vital alternative energy source, and has been extensively explored during the past few decades. [5] For instant, solar energy could be employed practically in photocatalysis for water splitting to generate hydrogen, carbon dioxide conversion to value added products, and pollutant oxidation. [6][7][8] Photocatalysis has advantage over conventional biological, incineration, electrocatalytic, adsorption, and air stripping treatment techniques because these methods always exhibit shortfalls such as instability, catalyst poisoning, low production yield, poor mechanical strength, time consuming, and electrode corrosion. [9,10] Generally, the photocatalytic process involves several essential steps such as the light absorption by photocatalyst to generate charge carriers, charge carrier's separation and migration to the photocatalyst surface, and the surface redox reactions to transform solar energy into chemical energy. [11,12] If these essential steps are satisfied by a proficient photocatalyst, then of course, high photocatalytic efficiency could be expected. Generally, the fundamental features of a photocatalyst include appropriate band gaps with their corresponding valence and conduction band potentials, surface active sites, surface area, and optical absorption behavior that govern the efficiency and effectiveness of photocatalytic processes. [13,14] Since the photocatalytic reactions are typically performed in water and air environments, therefore, the photocatalyst stability could be crucial under these circumstances. [15] Fujishima and Honda performed water splitting reaction for the first time in 1972, while utilizing TiO 2 photoanode with the aid of Pt as a counter electrode. [16] Afterward, TiO 2 photocatalyst received marvelous attention in photocatalysis owing to its promising features such as its non-toxic nature, water insolubility, nature abundant, hydrophilicity, high stability, and appropriate valence and conduction band potentials for redox reactions. [17] Yet, the Photocatalysis is an advanced technique that transforms solar energy into sustainable fuels and oxidizes pollutants via the aid of semiconductor photo catalysts. The main scientific and technological challenges for effective photocatalysis are the stability, robustness, and efficiency of semiconductor photocatalysts. For practical applications, researchers are trying to develop highly efficient and stable photocatalysts. Since the literature is highly scattered, it is urgent to write a critical review that summarizes the stateof theart progress in the ...

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“…Through an optimized hydrolysis reaction, mesoporous TiO 2 nanoshells were coated on BaTiO 3. In comparison with pure TiO 2 nanoparticles, a higher photocatalytic performance was seen in the BaTiO 3 -TiO 2 core-shell heterostructures of all weight ratios adopted in this work, which was due to the lower recombination rate of photogenerated electron-hole pairs as evident from photoluminescence (PL) spectroscopy [20,21,22,23]. The internal field arising from ferroelectric BaTiO 3 core acts as a driving force for the separation of photogenerated electron-hole pairs and promotion of charge transport to the surface of TiO 2, resulting in increased photocatalytic activity with excellent stability.…”

Section: Introductionmentioning

confidence: 97%

Ferroelectric Polarization-Enhanced Photocatalysis in BaTiO3-TiO2 Core-Shell Heterostructures

Liu

Fan

et al. 2019

Nanomaterials

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Suppressing charge recombination and improving carrier transport are key challenges for the enhancement of photocatalytic activity of heterostructured photocatalysts. Here, we report a ferroelectric polarization-enhanced photocatalysis on the basis of BaTiO3-TiO2 core-shell heterostructures synthesized via a hydrothermal process. With an optimal weight ratio of BaTiO3 to TiO2, the heterostructures exhibited the maximum photocatalytic performance of 1.8 times higher than pure TiO2 nanoparticles. The enhanced photocatalytic activity is attributed to the promotion of charge separation and transport based on the internal electric field originating from the spontaneous polarization of ferroelectric BaTiO3. High stability of polarization-enhanced photocatalysis is also confirmed from the BaTiO3-TiO2 core-shell heterostructures. This study provides evidence that ferroelectric polarization holds great promise for improving the performance of heterostructured photocatalysts.

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Photoluminescence and photocatalytic studies of cadmium sulfide/multiwall carbon nanotube (CdS/MWCNT) nanocomposites

Cited by 34 publications

References 41 publications

Effect of Ni doping on the structural, optical and photocatalytic activity of MoS₂, prepared by Hydrothermal method

Effect of Ni doping on the structural, optical and photocatalytic activity of MoS₂, prepared by Hydrothermal method

Recent Progress in the Synthesis and Applications of Composite Photocatalysts: A Critical Review

Ferroelectric Polarization-Enhanced Photocatalysis in BaTiO3-TiO2 Core-Shell Heterostructures

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Photoluminescence and photocatalytic studies of cadmium sulfide/multiwall carbon nanotube (CdS/MWCNT) nanocomposites

Cited by 34 publications

References 41 publications

Effect of Ni doping on the structural, optical and photocatalytic activity of MoS2, prepared by Hydrothermal method

Effect of Ni doping on the structural, optical and photocatalytic activity of MoS2, prepared by Hydrothermal method

Recent Progress in the Synthesis and Applications of Composite Photocatalysts: A Critical Review

Ferroelectric Polarization-Enhanced Photocatalysis in BaTiO3-TiO2 Core-Shell Heterostructures

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Effect of Ni doping on the structural, optical and photocatalytic activity of MoS₂, prepared by Hydrothermal method

Effect of Ni doping on the structural, optical and photocatalytic activity of MoS₂, prepared by Hydrothermal method