Comparison of optical properties and photocatalytic behavior of TiO2/MWCNT, CdS/MWCNT and TiO2/CdS/MWCNT nanocomposites

Askari, Mohammad Bagher; Banizi, Zoha Tavakoli; Soltani, Sahar; Seifi, Majid

doi:10.1016/j.ijleo.2017.11.080

Cited by 47 publications

(15 citation statements)

References 19 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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“…5 c. The absorption spectra show the two peaks at 350 nm and 495 nm corresponding to the aromatic ring and π–π* transitions emerging from the azodic group. The decomposition of Congo red dye was proved by the reduction in peaks intensity and color change from red to a colorless solution with increasing the time interval under visible light irradiation 79 , 80 . Similarly, the above-mentioned experiment was carried out in the absence of the photocatalyst and in the dark condition as shown in Fig.…”

Section: Resultsmentioning

confidence: 99%

Facile synthesis and defect optimization of 2D-layered MoS2 on TiO2 heterostructure for industrial effluent, wastewater treatments

Ramalingam

Chinnapan

Bojarajan

et al. 2020

Sci Rep

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Current research is paying much attention to heterojunction nanostructures. Owing to its versatile characteristics such as stimulating morphology, affluent surface-oxygen-vacancies and chemical compositions for enhanced generation of reactive oxygen species. Herein, we report the hydrothermally synthesized TiO2@MoS2 heterojunction nanostructure for the effective production of photoinduced charge carriers to enhance the photocatalytic capability. XRD analysis illustrated the crystalline size of CTAB capped TiO2, MoS2@TiO2 and L-Cysteine capped MoS2@TiO2 as 12.6, 11.7 and 10.2 nm, respectively. The bandgap of the samples analyzed by UV–Visible spectroscopy are 3.57, 3.66 and 3.94 eV. PL spectra of anatase phase titania shows the peaks present at and above 400 nm are ascribed to the defects in the crystalline structure in the form of oxygen vacancies. HRTEM reveals the existence of hexagonal layered MoS2 formation on the spherical shaped TiO2 nanoparticles at the interface. X-ray photoelectron spectroscopy recommends the chemical interactions between MoS2 and TiO2, specifically, oxygen vacancies. In addition, the electrochemical impedance spectroscopy studies observed that L-MT sample performed low charge transfer resistance (336.7 Ω cm2) that promotes the migration of electrons and interfacial charge separation. The photocatalytic performance is evaluated by quantifying the rate of Congo red dye degradation under visible light irradiation, and the decomposition efficiency was found to be 97%. The electron trapping recombination and plausible photocatalytic mechanism are also explored, and the reported work could be an excellent complement for industrial wastewater treatment.

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“…This aspect is also being reflected in the XRD spectra. The absorption band between 472 and 517 cm −1 in the pure BNT and that between 470 and 850 cm −1 in BNTC composites correspond to the vibration band of Ti-O [15][16][17][18]. The absorption band near 933 cm −1 in all the composition of x corresponds to the Bi-O and/or Bi-O-Bi in [BiO6] octahedral vibration mode [19].…”

Section: Fourier Transform Infrared Spectroscopy (Ftir)mentioning

confidence: 94%

Effect of cerium oxide addition on optical, electrical and dielectric characteristics of (Bi_0.5Na_0.5)TiO₃ ceramics

2018

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The composite ceramics, Bi 0.5 Na 0.5 TiO 3 −xCeO 2 (x=0, 0.05, 0.10, 0.15) with a general chemical composition (Bi 0.5 Na 0.5 )(Ti 1−x Ce x )O 3 were fabricated by using a solid state reaction ceramic technology. The detailed structural analysis using x-ray diffraction data exhibits the formation of composites of Bi 0.5 Na 0.5 TiO 3 (BNT) and CeO 2 in rhombohedral and cubic phase respectively. The Fourier transform infrared spectroscopy spectrums confirm the formation of compounds through the occurrence of characteristic peak corresponding to Ce-O, Ti-O and Bi-O bonds. With the increase in CeO 2 content in the composite, the optical band gap decreases from 2.97 eV (for x=0) to 2.45 eV for the sample (for x=0.15). The impedance analysis confirms the contribution of grains only to the polarization and conduction processes. Two phase change corresponding to ferroelectric to antiferroelectric, and then to the paraelectric is observed at around 350°C and 470°C respectively. The addition of CeO 2 in BNT significantly enhances the dielectric and ferroelectric properties with the decrease in loss tangent.

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Comparison of optical properties and photocatalytic behavior of TiO2/MWCNT, CdS/MWCNT and TiO2/CdS/MWCNT nanocomposites

Cited by 47 publications

References 19 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

Facile synthesis and defect optimization of 2D-layered MoS2 on TiO2 heterostructure for industrial effluent, wastewater treatments

Effect of cerium oxide addition on optical, electrical and dielectric characteristics of (Bi_0.5Na_0.5)TiO₃ ceramics

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Comparison of optical properties and photocatalytic behavior of TiO2/MWCNT, CdS/MWCNT and TiO2/CdS/MWCNT nanocomposites

Cited by 47 publications

References 19 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

Facile synthesis and defect optimization of 2D-layered MoS2 on TiO2 heterostructure for industrial effluent, wastewater treatments

Effect of cerium oxide addition on optical, electrical and dielectric characteristics of (Bi0.5Na0.5)TiO3 ceramics

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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

Effect of cerium oxide addition on optical, electrical and dielectric characteristics of (Bi_0.5Na_0.5)TiO₃ ceramics