Abstract
This article presents a simple and inexpensive method for the synthesis of SnO2 nanoparticles (SnO2 NPs) in the presence of non-toxic cochineal dye. As-synthesized nanoparticles were confirmed by various spectroscopic and microscopic techniques such as UV–Visible, XRD, FTIR, DLS and TEM. UV–Visible spectroscopy showed λmax for SnO2 NPs at 350 nm and it remains stable for 3 months at room temperature. The XRD result confirms the simultaneous presence of orthorhombic SnO2 (78%) and Sn (22%) nanoparticles. FTIR showed strong vibration at 543 and 598 cm−1 which corresponds to Sn–O of SnO2 NPs. The obtained TEM and DLS results stated the formation of the cube and spherical SnO2 NPs with an average diameter of about 30–50 nm. These particles do not aggregate in suspension because their outer surface is protected by an organic layer of cochineal. Approximately 83% methylene blue dye was degraded photocatalytically by SnO2 NPs within 180 min at a rate constant of 17.6001 × 10–3 min−1.
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