The study of Fe-doped CdS nanoparticle-assisted photocatalytic degradation of organic dye in wastewater

Junaid, Muhammad; Imran, Muhammad; Ikram, Muhammad; Naz, Misbah; Aqeel, Muhammad; Afzal, H.; Majeed, Hamid; Ali, Salamat

doi:10.1007/s13204-018-0933-3

Cited by 75 publications

(35 citation statements)

References 43 publications

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“…This recombination of electron-hole pairs in the solution, which means that the degradation rate enhances when the metals ions included in CdS QDs as shown in Figure 8b. Similar properties of Fe doped CdS NP was observed as higher catalytic degradation as compared to undoped CdS [47]. On other hand, rate of degradation is slightly faster in case of Fe doped CdS since the peak is disappeared at 150 min as shown in Figure 8c.…”

Section: Photoluminescence Analysissupporting

confidence: 68%

“…The absorption peak positions of doping metals, namely silver (Ag), iron (Fe) and Zn are observed at 270, 272 and 273 nm which are all very slightly red-shifted as compared with the absorption of CdS at 267 nm. These pattern were observed with metals co-doped CdS quantum dots [46][47][48]. Also a slightly red-shift has been observed in the absorption edge on doping the nanoparticles with Ag.…”

Section: Absorption Analysissupporting

confidence: 53%

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Metals Doped CdS Quantum Dots: Structural, Optical and Photocatalytic Properties under Visible Light Irradiation

Abdullah¹,

Majeed²,

Ali³

2020

Int J Metall Met Phys

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Cadmium sulphide quantum dots (CdS-QDs) were obtained by a precipitation method. Studies on the structural, optical and photocatalytic properties of undoped and metals (M = Fe, Ag, Zn) doped CdS were investigated. The structural properties of the metals composite CdS were analyzed using X-ray diffraction (XRD) and Infrared (IR) techniques. Optical properties of the composite materials were characterized by absorption and photoluminescence techniques. XRD pattern reveals the undoped and metals doped QDs have highly crystalline in nature with cubic phases. High transmission electron microscopy (TEM) shows the spherical shape of particles with approximately 3-4 nm in sizes. The crystallite sizes of CdS are increased with doping of metals but slightly different the sizes of XRD and TEM images. The band gap values of CdS, Fe:CdS, Ag:CdS, and Zn:CdS calculated by Tauc plot are predicted as 3.64, 3.50 eV, 3.43 and 3.35 eV respectively. Upon doping metals, shift in band gap of QDs toward the longer wavelength with the increases of crystallite sizes is observed and depends on type of metals. The emission peak of QDs is appeared at 521 nm along with a shoulder at 430 nm which confirms of cadmium vacancies in the lattice. The emission intensity of QDs is decreased when metals are included. The emission peaks of metals doped QDs are gradually decreased over the increasing irradiation time and influenced by the nature of metal. The photo-catalytic activity and efficiency degradation are dependent of metals which may due to different crystal quality in Ag, Fe and Zn into CdS QDs composite. Present results suggest that Zn:CdS composite enhanced with superior photo-degradation efficiency and photo-catalytic activity under the sunlight.

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Section: Photoluminescence Analysissupporting

confidence: 68%

Section: Absorption Analysissupporting

confidence: 53%

Metals Doped CdS Quantum Dots: Structural, Optical and Photocatalytic Properties under Visible Light Irradiation

Abdullah¹,

Majeed²,

Ali³

2020

Int J Metall Met Phys

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“…Annually~1/10th million types of dyes are produced in numerous textile processes, among these dyes methylene blue (MB) 10-15% is directly released in the effluent. These pollutants create serious health issues such as cancer, skin irascibilities, allergy, and liver malfunctioning and are also harmful to aquatic life [4,5].…”

Section: Introductionmentioning

confidence: 99%

Hydrothermal Synthesis of Silver Decorated Reduced Graphene Oxide (rGO) Nanoflakes with Effective Photocatalytic Activity for Wastewater Treatment

et al. 2020

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Graphene oxide (GO) was obtained through modified hummers method, and reduced graphene oxide (rGO) was acquired by employing heat treatment. Various concentrations (2.5, 5, 7.5, and 10 wt. %) of silver (Ag) were incorporated in GO nanosheets by adopting hydrothermal approach. Synthesized Ag decorated rGO photocatalyst Ag/rGO was characterized using X-ray diffraction (XRD) to determine phase purity and crystal structure. XRD patterns showed the formation of GO to Ag/rGO. Molecular vibration and functional groups were determined through Fourier Transform Infrared spectroscopy (FTIR). Optical properties and a decrease in bandgap with insertion of Ag were confirmed with UV-Visible (Uv-Vis) spectrophotometer and photoluminescence (PL). Electronic properties and disorders in carbon structures were investigated through Raman spectroscopy that revealed the existence of characteristic bands (D and G). Surface morphology of prepared samples was examined with field emission scanning electron microscope (FESEM). Homogeneous distribution, size, and spherical shape of Ag NPs over rGO sheets were further confirmed with the help of high-resolution transmission electron microscope (HR-TEM). Dye degradation of doped and undoped samples was examined through Uv-Vis spectra. Experimental results indicated that photocatalytic activity of Ag@rGO enhanced with increased doping ratio owing to diminished electron-hole pair recombination. Therefore, it is suggested that Ag@rGO can be used as a beneficial and superior photocatalyst to clean environment and wastewater.

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“…According to literature, a large number of dyes including congo red, Martius yellow, methyl orange, methyl red, and methyl blue are used in a variety of industrial sectors such as leather, construction, paper, metal manufacturing, and printing [22][23][24]. Harmful metallic ions (Pb, Cr, Hg, Cu, etc.)…”

Section: Introductionmentioning

confidence: 99%

Application of Chemically Exfoliated Boron Nitride Nanosheets Doped with Co to Remove Organic Pollutants Rapidly from Textile Water

et al. 2020

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Two-dimensional layered materials doped with transition metals exhibit enhanced magnetization and improved catalytic stability during water treatment leading to potential environmental applications across several industrial sectors. In the present study, cobalt (Co)-doped boron nitride nanosheets (BN-NS) were explored for such an application. Chemical exfoliation process was used to exfoliate BN-NS and the hydrothermal route was adopted to incorporate Co dopant in various concentrations (e.g., 2.5, 5, 7.5, and 10 wt%). X-ray diffraction (XRD) study indicated that crystallinity improved upon doping with the formation of a hexagonal phase of the synthesized material. Selected area electron diffraction (SAED) confirmed enhanced crystallinity, which corroborates XRD results. Interlayer spacing was evaluated through a high-resolution transmission electron microscope (HR-TEM) equipped with Gatan digital micrograph software. Compositional and functional group analysis was undertaken with energy dispersive Xray (EDS) and Fourier transform infrared (FTIR) spectroscopy, respectively. Field emission scanning electron microscope (FE-SEM) and HR-TEM were utilized to probe surface morphologies of prepared samples. Bonding modes in the sample were identified through Raman analysis. Optical properties were examined using UV-vis spectroscopy. Photoluminescence spectra were acquired to estimate the separation and recombination of excitons. Magnetic properties were studied by means of hysteresis loop acquired using VSM measurements. Methylene blue dye was degraded with as-prepared host and doped nanosheets used as catalysts and investigated through absorption spectra ranging from 250 to 800 nm. The experimental results of this study indicate that Co-doped BN-NS showed enhanced magnetic properties and can be used to degrade dyes present as an effluent in industrial wastewater.

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The study of Fe-doped CdS nanoparticle-assisted photocatalytic degradation of organic dye in wastewater

Cited by 75 publications

References 43 publications

Metals Doped CdS Quantum Dots: Structural, Optical and Photocatalytic Properties under Visible Light Irradiation

Metals Doped CdS Quantum Dots: Structural, Optical and Photocatalytic Properties under Visible Light Irradiation

Hydrothermal Synthesis of Silver Decorated Reduced Graphene Oxide (rGO) Nanoflakes with Effective Photocatalytic Activity for Wastewater Treatment

Application of Chemically Exfoliated Boron Nitride Nanosheets Doped with Co to Remove Organic Pollutants Rapidly from Textile Water

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