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Silver Sulfide-Based Nanocomposite: Synthesis, Characterization and Its Red/Near-IR Light Driven Photodegradation Activity

02 June 2020 Institute of Materials, Malaysia|A

A simple, aqueous-based method was developed for the synthesis of silver sulfide/silver (Ag2S/Ag) nanocomposite by simple ion exchange method in water under ambient conditions. The Ag2S/Ag nanocomposite produced was in the form of segregated spherical particles with a bimodal distribution. One distribution centered at 59 nm and the other centered at 155 nm. The nanocomposite was characterized by Field-Emission Scanning Electron Microscopy (FESEM) and Powder X-ray Diffraction (PXRD). Aqueous dispersion of the nanocomposite was highly stable with a zeta potential of -40 mV across a range of pH values. At pH 6.1, the nanocomposite was able to degrade methylene blue (a dye with a cationic organic moiety) under red/near-infrared (NIR) irradiation up to 34% in 1 hour, 30% higher than the 3% observed for the control. Increasing pH value was found to enhance the photodegradation efficiency more effectively than increasing catalyst loading.

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