Black lead molybdate nanoparticles: Facile synthesis and photocatalytic properties responding to visible light

Du, Weimin; Liu, Lixin; Zhou, Keke; Ma, Xiaodan; Hao, Yaming; Qian, Xuefeng

doi:10.1016/j.apsusc.2014.12.068

Cited by 32 publications

(10 citation statements)

References 48 publications

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“…The broad band centered at 390 nm could be attributed to the presence of C moieties originating from MoS 2 -N-H. As reported in the literature, molybdate is a direct band gap semiconductor and has a band gap value of ∼3.40 eV. 63 The band gap of PbMoO 4−x S x was calculated from the tangent to the x-axis in the Tauc plot of (αhν) 2 vs hν (energy) (see the inset of Figure 12a). The band gap of PbMoO 4−x S x was determined to be 3.86 eV, which can only be activated in UV light.…”

Section: ■ Results and Discussionmentioning

confidence: 60%

“…The deconvoluted Pb 4f spectrum in Figure c exhibited peaks at 138.7 and 143.5 eV, which corresponded to Pb 4f 7/2 and Pb 4f 5/2 , respectively, suggesting the occurrence of Pb 2+ as Pb–O of the PbMoO 4– x S x . The binding energy peak at 144.3 and 139.5 eV was related to Pb 4f 5/2 and Pb 4f 7/2 , which occurred due to the existence of Pb 2+ as Pb–S of the PbMoO 4– x S x . , The both sets of peaks showed a separation gap of 4.8 eV, which reflected the strong binding between Pb and O/S atoms. The high-resolution spectrum of Mo 3d exhibited two pairs of doublet peaks that corresponded to the two kinds of oxidation states of Mo in PbMoO 4– x S x (Figure d).…”

Section: Resultsmentioning

confidence: 93%

“…Furthermore, the kinetics of the degradation of CIP using the nanospindles was analyzed using the first-order kinetics reaction ( ) Kt − and Mo(VI)/ Pb(II) and resulted in enhanced photodegradation. 63 Furthermore, the dangling sulfur bonds in PbMoO 4−x S x also promoted degradation by providing catalytically active sites. The proposed charge transfer delayed the recombination of e − /h + pairs, which led to high production of reactive oxygen species (ROS).…”

Section: ■ Results and Discussionmentioning

confidence: 99%

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Achieving Controllable MoS₂ Nanostructures with Increased Interlayer Spacing for Efficient Removal of Pb(II) from Aquatic Systems

Kumar

Fosso‐Kankeu

Ray

2019

ACS Appl. Mater. Interfaces

125

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The development of new synthesis approaches for MoS 2 is necessary to achieve controlled morphologies and unique physicochemical properties that can improve its efficiency in particular applications. Herein, a facile one-step hydrothermal route is proposed to prepare controllable MoS 2 micro/nanostructures with an increased interlayer using sodium diethyldithiocarbamate trihydrate as the new S source at different pH values. To investigate the morphology, chemical composition, and structure of the MoS 2 micro/ nanostructures, various characterization techniques were used. The obtained microrods, microspheres, and microrods with hairlike structures (denoted as MoS 2 -N-H) were composed of MoS 2 nanosheets with increased interlayer spacing (∼1.0 nm) and utilized for the removal of Pb(II) from aquatic systems. Among the structures, MoS 2 -N-H demonstrated the highest adsorption capacity (303.04 mg/g) for Pb(II) due to the existence of −S/−C/−N/−O-comprised functional groups on its surface, which led to strong Pb−S complexation and electrostatic attractions. The uptake of Pb(II) onto MoS 2 -N-H followed pseudo-second-order kinetics and Freundlich isotherm. To evaluate its practical applicability, the adsorbent was employed in real mine water analysis; it was found that MoS 2 -N-H could adsorb almost 100% of the Pb(II) ions in the presence of various coexisting ions. Additionally, after Pb(II) adsorption, MoS 2 -N-H was transformed into PbMoO 4-x S x spindlelike nanostructures, which were further used for photodegradation of an antibiotic, viz., ciprofloxacin (CIP), to avoid secondary environment waste. Thus, this investigation provides an effective one-pot approach to fabricate controllable MoS 2 micro/nanostructures with increased interlayer spacing for water treatment. The utility of these nanostructures in related supercapacitor/battery applications may also be envisaged because of their unique structural properties.

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Section: ■ Results and Discussionmentioning

confidence: 60%

Section: Resultsmentioning

confidence: 93%

Section: ■ Results and Discussionmentioning

confidence: 99%

See 1 more Smart Citation

Achieving Controllable MoS₂ Nanostructures with Increased Interlayer Spacing for Efficient Removal of Pb(II) from Aquatic Systems

Kumar

Fosso‐Kankeu

Ray

2019

ACS Appl. Mater. Interfaces

125

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“…Prominent Pb 4f peaks appear in figure 2(c) after immersion in the Pb(NO 3 ) 2 solution indicating the presence of Pb on MoS 2 surfaces. We have identified peaks that likely correspond to Pb-S bonding [22], PbMoO 4 [42,43], and PbSO 4 [44]. These results suggest that there is chemisorption of the Pb onto the MoS 2 surface by forming a Pb-S bond, as well as a reductive reaction between Pb and MoS 2 , which is reported to form MoO 4 2− and SO 4 2− [11,45], to form the new PbMoO 4 and PbSO 4 compounds.…”

Section: Chemical and Elemental Analysismentioning

confidence: 71%

Interaction of Pb²⁺ ions in water with two-dimensional molybdenum disulfide

Gilliam

Debnath

et al. 2020

J. Phys. Mater.

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The removal of heavy metal contaminants from water is important for public health, and recently many two-dimensional (2D) materials with high specific surface areas are being studied as promising new active components in water purification. In particular, 2D MoS 2 nanosheets have been used for the removal of various heavy metals, but usually in either in complex geometries and composites, or in the chemically exfoliated metallic 1T-MoS 2 phase. However, the interaction of heavy metals dissolved in water with unmodified semiconducting 2H-MoS 2 is not well studied. In this paper, we report a detailed fundamental investigation of how Pb 2+ ions interact with 2H-MoS 2 . We observe small solid clusters that form on the MoS 2 surfaces after exposing them to Pb(NO 3 ) 2 aqueous solutions as shown by atomic force microscopy and transmission electron microscopy, and for liquid phase exfoliated MoS 2 we observe the nanosheets precipitating out of dispersion along with insoluble solid granules. We use a combination of x-ray photoelectron spectroscopy and x-ray diffraction to identify these solid clusters and granules as primarily PbSO 4 with some PbMoO 4 . We put forth an interaction mechanism that involves MoS 2 defects acting as initiation sites for the partial dissolution in aqueous oxygenated conditions which produces MoO 4 2− and SO 4 2− ions to form the solids with Pb 2+ . These results are an important contribution to our fundamental understanding of how MoS 2 interacts with metal ions and will influence further efforts to exploit MoS 2 for water remediation applications.

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“…Metal molybdates such as A x MoO z (where A is a monovalent, divalent, or trivalent metal ion) have recently been investigated intensively [1,2,11,12,[3][4][5][6][7][8][9][10] owing to their chemical stability and unique crystal structure (layers of molybdenum oxide octahedra separated by the metal ions) [13], which make them suitable for a wide range of applications. Particularly, silver molybdates have been investigated in the fields of lubrication [14,15], humidity and gas sensors [16,17], surface enhanced Raman scattering techniques [18,19], photocatalysis [11][12][13]20,21], and photoluminescence [20,22,23].…”

Section: Introductionmentioning

confidence: 99%

Unvealing the role of β-Ag2MoO4 microcrystals to the improvement of antibacterial activity

Foggi

Oliveira

Assis

et al. 2020

Materials Science and Engineering: C

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Crystal morphology with different surfaces is important for improving the antibacterial activity of materials. In this experimental and theoretical study, the antibacterial activity of β-Ag 2 MoO 4 microcrystals against the Gram-positive bacteria, namely, methicillin-resistant Staphylococcus aureus (MRSA), and the Gram-negative bacteria, namely, Escherichia coli (E.coli), was investigated. In this study, β-Ag 2 MoO 4 crystals with different morphologies were synthetized by a simple co-precipitation method using three different solvents. The antimicrobial efficacy of the obtained microcrystals against both bacteria increased according to the solvent used in the following order: water

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Black lead molybdate nanoparticles: Facile synthesis and photocatalytic properties responding to visible light

Cited by 32 publications

References 48 publications

Achieving Controllable MoS₂ Nanostructures with Increased Interlayer Spacing for Efficient Removal of Pb(II) from Aquatic Systems

Achieving Controllable MoS₂ Nanostructures with Increased Interlayer Spacing for Efficient Removal of Pb(II) from Aquatic Systems

Interaction of Pb²⁺ ions in water with two-dimensional molybdenum disulfide

Unvealing the role of β-Ag2MoO4 microcrystals to the improvement of antibacterial activity

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Black lead molybdate nanoparticles: Facile synthesis and photocatalytic properties responding to visible light

Cited by 32 publications

References 48 publications

Achieving Controllable MoS2 Nanostructures with Increased Interlayer Spacing for Efficient Removal of Pb(II) from Aquatic Systems

Achieving Controllable MoS2 Nanostructures with Increased Interlayer Spacing for Efficient Removal of Pb(II) from Aquatic Systems

Interaction of Pb2+ ions in water with two-dimensional molybdenum disulfide

Unvealing the role of β-Ag2MoO4 microcrystals to the improvement of antibacterial activity

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Product

Resources

About

Achieving Controllable MoS₂ Nanostructures with Increased Interlayer Spacing for Efficient Removal of Pb(II) from Aquatic Systems

Achieving Controllable MoS₂ Nanostructures with Increased Interlayer Spacing for Efficient Removal of Pb(II) from Aquatic Systems

Interaction of Pb²⁺ ions in water with two-dimensional molybdenum disulfide