Visible‐Light‐Induced Photochemical Hydrogen Evolution and Degradation of Crystal Violet Dye by Interwoven Layered MoS<sub>2</sub>/Wurtzite ZnS Heterostructure Photocatalyst

Akshatha, S.; Sreenivasa, S.; Parashuram, L.; Raghu, M.S.; Kumar, K. Yogesh; Rao, Tadimety Madhu Chakrapani

doi:10.1002/slct.202001914

Cited by 26 publications

(12 citation statements)

References 42 publications

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“…The large surface area and higher band gap make MoS 2 -ZnS nanocomposite to reach adsorption-desorption equilibrium faster than the other species. 29 The photocatalytic dye degradation mechanism for MoS 2 and MoS 2 -ZnS nanocomposite are explained below. Figure 2a represents a schematic illustration of photocatalysis mechanism.…”

Section: Resultsmentioning

confidence: 99%

Experimental and Theoretical Investigation of Degradation Activity of Layered Two-Dimensional MoS₂-ZnS Nanocomposites

Thomas¹,

G.P.²,

R.S.³

et al. 2023

ECS J. Solid State Sci. Technol.

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Commercial wastewater treatment via eco-friendly routes are highly appreciated as a sustainable solution as per the United Nation’s Sustainable Development Goal 6 (UNSDG-6). Here, we report a cost-effective and efficient route to treat wastewater by photocatalysis using sunlight. Hydrothermally-synthesized MoS2-ZnS nanocomposite is used as photocatalyst and methylene blue (MB) and rhodamine B (RhB) are used as model dyes to study the photocatalytic degradation activity. After exposure to sunlight for a period of 60 minutes, the MoS2-ZnS nanocomposite shows a degradation of 98.29 and 93.01% for MB and RhB, respectively. This enhanced photocatalytic activity of the MoS2-ZnS nanocomposite is due to its high light absorption and lower electron-hole recombination for the degradation of dyes. No harmful by-products are formed, which shows the eco-friendly nature of photocatalytic degradation of dyes in wastewater. A detailed theoretical investigation is carried out using density functional theory analysis performed for dyes and the photocatalysts in order to understand the mechanism behind the degradation. A good correlation between the calculated and experimental data is observed. This study proclaims that MoS2-ZnS nanocomposite is a cost-effective and efficient photocatalyst among other costly layered two-dimensional nanocomposites.

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Section: Resultsmentioning

confidence: 99%

Experimental and Theoretical Investigation of Degradation Activity of Layered Two-Dimensional MoS₂-ZnS Nanocomposites

Thomas¹,

G.P.²,

R.S.³

et al. 2023

ECS J. Solid State Sci. Technol.

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“…(d) The S 2p signal confirmed the occurrence of S-atom in the Cys sorbent as an organic form. The asymmetric S 2p peak was deconvoluted into two subpeaks assigned to S 2p 3/2 and S 2p 1/2 , which were noticed at 164.17 eV and 168.05 eV, respectively, indicating the S 2− presence as C-S-C [51]. There was a relative decrease in their intensity, indicating that S-atom is involved in U sorption as a chelation thiolate-U via S-orbitals.…”

Section: Xps Spectroscopymentioning

confidence: 98%

Mesoporous Magnetic Cysteine Functionalized Chitosan Nanocomposite for Selective Uranyl Ions Sorption: Experimental, Structural Characterization, and Mechanistic Studies

et al. 2022

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Nuclear power facilities are being expanded to satisfy expanding worldwide energy demand. Thus, uranium recovery from secondary resources has become a hot topic in terms of environmental protection and nuclear fuel conservation. Herein, a mesoporous biosorbent of a hybrid magnetic–chitosan nanocomposite functionalized with cysteine (Cys) was synthesized via subsequent heterogeneous nucleation for selectively enhanced uranyl ion (UO22+) sorption. Various analytical tools were used to confirm the mesoporous nanocomposite structural characteristics and confirm the synthetic route. The characteristics of the synthesized nanocomposite were as follows: superparamagnetic with saturation magnetization (MS: 25.81 emu/g), a specific surface area (SBET: 42.56 m2/g) with a unipore mesoporous structure, an amine content of ~2.43 mmol N/g, and a density of ~17.19/nm2. The experimental results showed that the sorption was highly efficient: for the isotherm fitted by the Langmuir equation, the maximum capacity was about 0.575 mmol U/g at pH range 3.5–5.0, and Temperature (25 ± 1 °C); further, there was excellent selectivity for UO22+, likely due to the chemical valent difference. The sorption process was fast (~50 min), simulated with the pseudo-second-order equation, and the sorption half-time (t1/2) was 3.86 min. The sophisticated spectroscopic studies (FTIR and XPS) revealed that the sorption mechanism was linked to complexation and ion exchange by interaction with S/N/O multiple functional groups. The sorption was exothermic, spontaneous, and governed by entropy change. Desorption and regeneration were carried out using an acidified urea solution (0.25 M) that was recycled for a minimum of six cycles, resulting in a sorption and desorption efficiency of over 91%. The as-synthesized nanocomposite’s high stability, durability, and chemical resistivity were confirmed over multiple cycles using FTIR and leachability. Finally, the sorbent was efficiently tested for selective uranium sorption from multicomponent acidic simulated nuclear solution. Owing to such excellent performance, the Cys nanocomposite is greatly promising in the uranium recovery field.

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“…BiOI nanoplates were also combined with MoS 2 nanosheets [ 3 ]. ZnS was combined with MoS 2 to increase the efficiency of photocarrier generation, increasing the removal of crystal violet dye using visible light (λ > 420 nm) [ 132 ]. Composites of MoS 2 with UiO-66 resulted in an enhanced specific area and in more active sites being available [ 113 ].…”

Section: Mos 2 -Based Nanocompositesmentioning

confidence: 99%

MoS2 and MoS2 Nanocomposites for Adsorption and Photodegradation of Water Pollutants: A Review

Amaral

Daniel‐da‐Silva

2022

Molecules

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The need for fresh and conveniently treated water has become a major concern in recent years. Molybdenum disulfide (MoS2) nanomaterials are attracting attention in various fields, such as energy, hydrogen production, and water decontamination. This review provides an overview of the recent developments in MoS2-based nanomaterials for water treatment via adsorption and photodegradation. Primary attention is given to the structure, properties, and major methods for the synthesis and modification of MoS2, aiming for efficient water-contaminant removal. The combination of MoS2 with other components results in nanocomposites that can be separated easily or that present enhanced adsorptive and photocatalytic properties. The performance of these materials in the adsorption of heavy metal ions and organic contaminants, such as dyes and drugs, is reviewed. The review also summarizes current progress in the photocatalytic degradation of various water pollutants, using MoS2-based nanomaterials under UV-VIS light irradiation. MoS2-based materials showed good activity after several reuse cycles and in real water scenarios. Regarding the ecotoxicity of the MoS2, the number of studies is still limited, and more work is needed to effectively evaluate the risks of using this nanomaterial in water treatment.

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Visible‐Light‐Induced Photochemical Hydrogen Evolution and Degradation of Crystal Violet Dye by Interwoven Layered MoS₂/Wurtzite ZnS Heterostructure Photocatalyst

Cited by 26 publications

References 42 publications

Experimental and Theoretical Investigation of Degradation Activity of Layered Two-Dimensional MoS₂-ZnS Nanocomposites

Experimental and Theoretical Investigation of Degradation Activity of Layered Two-Dimensional MoS₂-ZnS Nanocomposites

Mesoporous Magnetic Cysteine Functionalized Chitosan Nanocomposite for Selective Uranyl Ions Sorption: Experimental, Structural Characterization, and Mechanistic Studies

MoS2 and MoS2 Nanocomposites for Adsorption and Photodegradation of Water Pollutants: A Review

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Visible‐Light‐Induced Photochemical Hydrogen Evolution and Degradation of Crystal Violet Dye by Interwoven Layered MoS2/Wurtzite ZnS Heterostructure Photocatalyst

Cited by 26 publications

References 42 publications

Experimental and Theoretical Investigation of Degradation Activity of Layered Two-Dimensional MoS2-ZnS Nanocomposites

Experimental and Theoretical Investigation of Degradation Activity of Layered Two-Dimensional MoS2-ZnS Nanocomposites

Mesoporous Magnetic Cysteine Functionalized Chitosan Nanocomposite for Selective Uranyl Ions Sorption: Experimental, Structural Characterization, and Mechanistic Studies

MoS2 and MoS2 Nanocomposites for Adsorption and Photodegradation of Water Pollutants: A Review

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Product

Resources

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Visible‐Light‐Induced Photochemical Hydrogen Evolution and Degradation of Crystal Violet Dye by Interwoven Layered MoS₂/Wurtzite ZnS Heterostructure Photocatalyst

Experimental and Theoretical Investigation of Degradation Activity of Layered Two-Dimensional MoS₂-ZnS Nanocomposites

Experimental and Theoretical Investigation of Degradation Activity of Layered Two-Dimensional MoS₂-ZnS Nanocomposites