“…The energy band gap calculated from the Tauc plot of the respective (αhν) 2 vs. hν (where α is the absorbance, h is Planck constant and ν is the frequency) gave the values 1.46, 1.50 and 1.72 eV for the Bi 2 S 3 (OAm), Bi 2 S 3 (OAc) and Bi 2 S 3 (HDA) respectively. These showed an increase in the energy band gap value of 1.3 eV reported of for bulk bismuth sulphide [56].…”
Section: Optical Studiesmentioning
confidence: 58%
“…The energy band gap calculated from the Tauc plot of the respective ( αhν ) 2 vs. hν (where α is the absorbance, h is Planck constant and ν is the frequency) gave the values 1.46, 1.50 and 1.72 eV for the Bi 2 S 3 (OAm), Bi 2 S 3 (OAc) and Bi 2 S 3 (HDA) respectively. These showed an increase in the energy band gap value of 1.3 eV reported of for bulk bismuth sulphide [ 56 ]. Figure 8 UV-vis-NIR and their respective Tauc plot of Bi 2 S 3 synthesized using bismuth(III) tris( N -methyl- N -phenyldithiocarbamate) in (a) oleylamine-Bi 2 S 3 (OAm), (b) oleic acid-Bi 2 S 3 (OAc), and (c) hexadecylamine-Bi 2 S 3 (HDA).…”
A simple solvothermal decomposition of bismuth dithiocarbamate complex in oleylamine, oleic acid, and hexadecylamine at 180 °C, yielded bismuth sulphide nanomaterials of different morphologies represented as Bi
2
S
3
(OAm), Bi
2
S
3
(OAc) and Bi
2
S
3
(HDA) respectively. The bismuth complex, used as the single source precursor, was synthesized and characterised by elemental analysis, FTIR, and NMR spectroscopic techniques. The spectroscopic and micro analysis confirmed the proposed compound, while the as-prepared nanoparticles were characterized using UV-visible spectroscopy, X-ray diffraction (XRD), scanning electron microscopy (SEM), transmission electron microscopy (TEM), and energy dispersive spectrometer (EDS). The effects of the different solvent media on the structural properties of the obtained Bi
2
S
3
were investigated. An orthorhombic phase bismuthinite of varying intensities were obtained, with an indication that a bias of orientations existed in the (2 1 1) crystallographic planes in the Bi
2
S
3
(OAm) compared to the characteristic (1 3 0) diffraction peak of Bi
2
S
3
. The microscopic analysis showed a correlation between the nanoparticles' morphology and the type of solvent used, which also implied that the properties of Bi
2
S
3
were affected by the solvent medium.
“…The energy band gap calculated from the Tauc plot of the respective (αhν) 2 vs. hν (where α is the absorbance, h is Planck constant and ν is the frequency) gave the values 1.46, 1.50 and 1.72 eV for the Bi 2 S 3 (OAm), Bi 2 S 3 (OAc) and Bi 2 S 3 (HDA) respectively. These showed an increase in the energy band gap value of 1.3 eV reported of for bulk bismuth sulphide [56].…”
Section: Optical Studiesmentioning
confidence: 58%
“…The energy band gap calculated from the Tauc plot of the respective ( αhν ) 2 vs. hν (where α is the absorbance, h is Planck constant and ν is the frequency) gave the values 1.46, 1.50 and 1.72 eV for the Bi 2 S 3 (OAm), Bi 2 S 3 (OAc) and Bi 2 S 3 (HDA) respectively. These showed an increase in the energy band gap value of 1.3 eV reported of for bulk bismuth sulphide [ 56 ]. Figure 8 UV-vis-NIR and their respective Tauc plot of Bi 2 S 3 synthesized using bismuth(III) tris( N -methyl- N -phenyldithiocarbamate) in (a) oleylamine-Bi 2 S 3 (OAm), (b) oleic acid-Bi 2 S 3 (OAc), and (c) hexadecylamine-Bi 2 S 3 (HDA).…”
A simple solvothermal decomposition of bismuth dithiocarbamate complex in oleylamine, oleic acid, and hexadecylamine at 180 °C, yielded bismuth sulphide nanomaterials of different morphologies represented as Bi
2
S
3
(OAm), Bi
2
S
3
(OAc) and Bi
2
S
3
(HDA) respectively. The bismuth complex, used as the single source precursor, was synthesized and characterised by elemental analysis, FTIR, and NMR spectroscopic techniques. The spectroscopic and micro analysis confirmed the proposed compound, while the as-prepared nanoparticles were characterized using UV-visible spectroscopy, X-ray diffraction (XRD), scanning electron microscopy (SEM), transmission electron microscopy (TEM), and energy dispersive spectrometer (EDS). The effects of the different solvent media on the structural properties of the obtained Bi
2
S
3
were investigated. An orthorhombic phase bismuthinite of varying intensities were obtained, with an indication that a bias of orientations existed in the (2 1 1) crystallographic planes in the Bi
2
S
3
(OAm) compared to the characteristic (1 3 0) diffraction peak of Bi
2
S
3
. The microscopic analysis showed a correlation between the nanoparticles' morphology and the type of solvent used, which also implied that the properties of Bi
2
S
3
were affected by the solvent medium.
“…Before H2O2 treatment, the highest intensity peaks are found at 158.3 and 163.6 eV, corresponding to the spin-orbit doublet of Bi 4f7/2 and Bi 4f5/2, respectively, of bismuth sulfide [46][47][48]. After H2O2 treatment, the presence of shoulders at higher energies of the doublet, 159.6 and 164.9 eV, are associated to the Bi-O bonds [49]. Figure 14B shows the S 2s spectra.…”
Hydrogen peroxide (H2O2) is a strong oxidizer that causes non-selective oxidation of sulfide minerals, and its influence on bismuth sulfide ores is not well-documented. In this study, H2O2 was proposed as an alternative bismuthinite depressant, and its effect on a Mo-Bi-containing ore was intensively investigated by batch flotation tests. Results showed that the addition of H2O2 significantly destabilized the froth phase, thus decreasing the solids and water recovery. The recovery of bismuth in molybdenum concentrate was dramatically decreased to 4.64% by H2O2 compared with that in the absence of H2O2 (i.e., 50.14%). The modified first-order kinetic model demonstrated that the flotation rate of molybdenite slightly declined after H2O2 addition, whereas that of bismuthinite was drastically reduced from 0.30 min−1 to 0.08 min−1 under the same condition. Simulation revealed that H2O2 affected the floatability of both molybdenite and bismuthinite but resulted in more detrimental effect to bismuthinite. Hence, H2O2 has the potential to act as an effective depressant in bismuth sulfide ore flotation.
“…The latter is a solvent that possess lower tangent loss compared to the former [26]; thus, during the microwave heating less heat is delivered which would result to a lower local temperature and a slower crystal growth process. Consequently, sample Bi2S3(DMF) has less crystalline nature compared to Bi2S3(EG) [27]. Therefore, the type of surfactant used influences the crystallinity of the particles, and play important role in the synthesis of nanocrystalline Bi2S3 from single source precursors.…”
Section: The X-ray Diffraction Pattern Of the Synthesized Bi2s3mentioning
One-dimensional nanostructures have been the focus of recent research interests because they possess high aspect ratio. In this study, bismuth sulphide nanorods have been synthesized via a simple microwave irradiation of bismuth dithiocarbamate complex in ethylene glycol (EG) and N,N-dimethyl formamide (DMF) solvents. The optical properties of the nanorods was studied by UV-vis spectroscopy, and the structural characterization was carried out using powder X-ray diffraction (p-XRD) analysis, transmission electron microscopy (TEM, HRTEM), scanning electron microscopy (SEM), and selected area electron diffraction (SAED). The XRD patterns indicated cubic phase, and the TEM analysis confirmed rod-like morphology with mean diameter of about 60 nm and irregular lengths. The role of the solvents on the nanostructures was discussed, and the band gap energies were estimated from Tauc plot. The synthesized bismuth sulphide nanorods exhibited quantum confinement effect. The synthesis approach via microwave irradiation of single source precursor is facile and efficient, thus promotes the production of large scale Bi2S3 nanorods by an environmentally friendly approach.
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