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MoS2/ZnO nanocomposites for efficient degradation of organic dyes and real industrial wastewater via photocatalytic process
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DOI：10.1016/j.mseb.2026.119400.png)
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Abstract
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Water scarcity and pollution are major issues worldwide, requiring immediate implementation of nano-technological solutions. MoS2/ZnO nanocomposites with varying weight ratios MoS2: ZnO (1:1,2:1,3:1,4:1) were synthesised using hydrothermal approach, followed by cost-effective ultrasonication method. The resulting synthesised samples were characterized using various analytical techniques including XRD, FTIR, HRTEM, FESEM, XPS, BET, Raman and UV-Vis spectroscopy. XRD patterns confirmed high crystallinity, structure and phase purity, which reveals successful formation of nanocomposite materials. The chemical bonding of prepared nanoparticles was examined by stretching and bending of bonds using FTIR spectroscopy. The microstructural study was conducted by HRTEM and FESEM with EDX and elemental mapping which revealed uniform dispersion and elemental composition between MoS2 nanoflowers and ZnO nanorods. The chemical states of Mo, S, Zn and O along with presence of oxygen vacancies were examined using XPS analysis. UV-Vis spectroscopy showed decrease in bandgap energy from 3.06 eV to 2.41 eV, attributed to formation of heterojunction on MoS2 integration with ZnO and improved light absorption. The synthesised MoZn41 demonstrated high photocatalytic performance, achieving 96% degradation of methylene blue, 93 % degradation of methyl violet and 86% degradation of industrial wastewater of Panipat city consisting of three distinct dyes i.e. Blue M3R, Yellow M3R and Red MSB dye under UV light within 90 minutes. The enhanced efficiency is due to efficient heterojunction formation between MoS2 and ZnO, which results in charge separation and increases reactive species in process of degradation. The nanocomposite exhibited remarkable stability and reusability, retaining more than 86% of overall photodegradation efficiency.
Keywords:
Photocatalysis
Industrial waste treatment
Methylene Blue
Methyl Violet
Heterostructure
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