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<p>ZnS-MoS<sub>2</sub> nanocomposites were synthesized via a hydrothermal approach and systematically studied for evaluating their photocatalytic and antibacterial performances. X-ray diffraction (XRD) study confirmed the formation of phase-pure hexagonal ZnS and 2H-MoS<sub>2</sub>, exhibited and demonstrated distinct diffraction peaks of both constituents of the composite. FESEM images revealed nanoscale ZnS particles uniformly anchored on layered MoS<sub>2</sub> sheets, forming an intimate interfacial heterojunction. FTIR and XPS analyses validated the coexistence of Zn, Mo, and S elements in their expected oxidation states, while subtle variations in binding energies and vibrational bands reflected interfacial interactions between ZnS and MoS<sub>2</sub>. The UV-Vis diffuse reflectance spectra (DRS) indicated enhanced visible-light absorption for the composites, with an estimated band gap of approximately 2.72&#xa0;eV. N<sub>2</sub> adsorption-desorption measurements revealed that the ZnS-MoS<sub>2</sub> nanocomposite exhibited a higher specific surface area than pure ZnS and MoS<sub>2</sub>, implying the availability of more active surface sites for reactant adsorption and efficient charge transfer across the heterointerface during photocatalysis. Photoluminescence (PL) spectra exhibited pronounced emission quenching for the composites, confirming suppressed charge recombination and effective carrier separation. Photocatalytic experiments revealed that the ZnS-MoS<sub>2</sub> nanocomposite achieved 88.08% degradation of Methylene Blue (MB) and 94.71% of Rhodamine B (RhB) within 180&#xa0;min, following pseudo-first-order kinetics with apparent rate constants of 0.0177 and 0.0163&#xa0;min<sup>− 1</sup> respectively. Antibacterial assays showed inhibition zones of 14.7 ± 0.01 against <i>Escherichia coli</i> and 13.3 ± 0.01&#xa0;mm against <i>Staphylococcus aureus</i>. The enhanced photocatalytic and antibacterial performances are attributed to synergistic interfacial charge transfer, improved light absorption, and increased surface-active sites. These findings establish the ZnS-MoS<sub>2</sub> heterostructure as an efficient multifunctional material for sustainable environmental remediation and antimicrobial applications.</p>

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Tailoring the Interfacial Charge Dynamics in ZnS-MoS2 Nanocomposites for High-Performance Photocatalysis and Bacterial Inactivation

  • 期刊论文

  • 发表日期：

    2026年3月7日

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  • Sangram Keshari Sahu,
  • Nihar Ranjan Panda,
  • Dojalisa Sahu

摘要

ZnS-MoS2 nanocomposites were synthesized via a hydrothermal approach and systematically studied for evaluating their photocatalytic and antibacterial performances. X-ray diffraction (XRD) study confirmed the formation of phase-pure hexagonal ZnS and 2H-MoS2, exhibited and demonstrated distinct diffraction peaks of both constituents of the composite. FESEM images revealed nanoscale ZnS particles uniformly anchored on layered MoS2 sheets, forming an intimate interfacial heterojunction. FTIR and XPS analyses validated the coexistence of Zn, Mo, and S elements in their expected oxidation states, while subtle variations in binding energies and vibrational bands reflected interfacial interactions between ZnS and MoS2. The UV-Vis diffuse reflectance spectra (DRS) indicated enhanced visible-light absorption for the composites, with an estimated band gap of approximately 2.72 eV. N2 adsorption-desorption measurements revealed that the ZnS-MoS2 nanocomposite exhibited a higher specific surface area than pure ZnS and MoS2, implying the availability of more active surface sites for reactant adsorption and efficient charge transfer across the heterointerface during photocatalysis. Photoluminescence (PL) spectra exhibited pronounced emission quenching for the composites, confirming suppressed charge recombination and effective carrier separation. Photocatalytic experiments revealed that the ZnS-MoS2 nanocomposite achieved 88.08% degradation of Methylene Blue (MB) and 94.71% of Rhodamine B (RhB) within 180 min, following pseudo-first-order kinetics with apparent rate constants of 0.0177 and 0.0163 min− 1 respectively. Antibacterial assays showed inhibition zones of 14.7 ± 0.01 against Escherichia coli and 13.3 ± 0.01 mm against Staphylococcus aureus. The enhanced photocatalytic and antibacterial performances are attributed to synergistic interfacial charge transfer, improved light absorption, and increased surface-active sites. These findings establish the ZnS-MoS2 heterostructure as an efficient multifunctional material for sustainable environmental remediation and antimicrobial applications.