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Multifunctional silver nanoparticles-based composites for SERS detection and photocatalytic degradation of micro- and/or nano-plastics
(Elsevier BV, 2026-04)
Nguyễn Hoàng Ly
;
HESAM, KAMYAB
;
Yasser Vasseghian
;
Sang-Woo Joo
Micro- and/or nano-plastics (MNPs) pose an emerging environmental issue due to their widespread presence in aquatic habitats, persistence in the environment, and potential toxic effects on ecosystems and public health. Silver nanoparticles (AgNPs) are well-known not only as plasmonic materials but also as mediators of photocatalysis, which is one of the most promising tools for identifying and degrading MNPs. This review covers recent advances in surface-enhanced Raman scattering (SERS) detection and the photocatalytic degradation of common plastics (e.g., polystyrene, polypropylene, polyvinyl chloride, etc.) using multifunctional AgNPs-based composites. These SERS substrates can detect MNPs in contaminated environmental water with consistent signals and high sensitivity. Notably, upon irradiation, these composites produce reactive oxygen species, triggering chain reactions that break down polymer chains into new compounds. Although AgNPs-based composites are stable, their photocatalytic efficiency is often limited by poor solar spectrum utilization, mass transfer resistance, and electron-hole recombination, leading to lower degradation rates and variable results. Some research highlights the ongoing need to improve photocatalyst design, reactor setups, and assessment methods for degradation. Additionally, the possible formation of toxic intermediates raises safety concerns, underscoring the need for further studies on ecotoxicological effects. When combined with other treatment methods, AgNPs-based SERS detection and photocatalysis provide a promising approach for addressing MNPs and other emerging pollutants in water treatment.
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A novel photocatalytic degradation of mixed dye through chemically synthesized ZnO/Fe2O3 nanocomposite
(Springer Science and Business Media LLC, 2024-06-07)
Utaiyachandran Manojkumar
;
Durairaj Kaliannan
;
Balamuralikrishnan Balasubramanian
;
Hesam Kamyab
;
Yasser Vasseghian
This study reported the synthesis and assessment of zinc oxide/iron oxide (ZnO/Fe2O3) nanocomposite as photocatalysts for the degradation of a mixture of methylene red and methylene blue dyes. X-ray diffraction analysis confirms that the crystallite of zinc oxide (ZnO) has a hexagonal wurtzite phase and iron oxide (Fe2O3) has a rhombohedral phase. Fourier Transform Infra-Red spectrum confirms the presence of Zn–O vibration stretching at 428, 480 and 543 cm−1 stretching confirming Fe–O bond formation. Scanning Electron Microscope images exhibited a diverse size and shape of the nanocomposites. The ZnO-90%/Fe2O3-10% and ZnO-10%/Fe2O3-90% nanocomposites reveal good photocatalytic activity with reaction rate constants of 1.5 × 10−2 and 0.66 × 10−2; and 1.3 × 10−2 and 0.60 × 10−2 for methylene blue and methyl red dye respectively. The results revealed that the synthesized ZnO/Fe2O3 nanocomposite is the best catalyst for dye degradation and can be used for industrial applications in future.
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Controllable synthesis of nanostructured flower-like cadmium sulfides for photocatalytic degradation of methyl orange under different light sources
(Elsevier BV, 2024-03)
Akbar Hojjati-Najafabadi
;
Elahe Farahbakhsh
;
Golnaz Gholamalian
;
Peizhong Feng
;
Fatemeh Davar
This study focuses on the synthesis and characterization of cadmium sulfide nanostructures by coprecipitation method. The materials are characterized by X-ray diffraction, scanning electron microscopy, Fourier transform infrared, and Raman spectroscopy. The bandgap of the nanostructures was calculated under different conditions ranged between 2.8 and 2.4 eV and the materials have flower-like morphology in a cubic crystal system. Photocatalytic degradation of methyl orange dye was investigated under different radiation sources (sunlight, ultraviolet light, xenon light, and sunlight simulator). The effect of pH, initial dye concentration, and photocatalyst concentration on dye degradation was examined to show good degradation performance upon exposure to sunlight, UV light and visible light radiation. The results showed that by reducing the pH, degradation was improved, showing good performance at pH 3 with 85 % within 90 min. In addition, the optimal conditions for dye degradation were observed at concentration of 10 mg, methyl orange dye initial concentration of 10 g/L, and pH of 3. A 100 % degradation of methyl orange dye occurred in 90 min of visible light radiation, suggesting the potentiality of cadmium sulfide nanostructures under the effect of UV irradiation for cleaner production and complete elimination of the dye from polluted water sources, thus contributing to environmental enhancement.

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