Colorimetric detection of platinum (IV) ions based on triangular silver nanoprism particles in aqueous environmental sample

Silver nitrate (AgNO 3 ), trisodium citrate dihydrate (C 6 H 5 Na 3 O 7 · 2H 2 O), sodium borohydride (NaBH 4 ), and L-ascorbic acid (C 6 H 8 O 6 ) were combined in distilled water to create a triangular silver nanoprism particle (AgNPRP) solution. UV-visible (UV-vis) spectroscopy at wavelengths of 350–460 nm and 580–700 nm was observed, and as a result of them, the successful formation of the triangular AgNPRPs was confirmed. The prepared silver nanoprism particles were characterized by X-ray diffraction(XRD), X-ray photoelectron spectroscopy (XPS), scanning electron microscopy(SEM), and transmission electron microscopy(TEM) and employed for the colorimetric detection of platinum(IV) ions in an aqueous solution containing Pt 4+ ions. The color of the aqueous silver nanoprism particle solution, containing Pt 4+ ions, changed from blue to light brown before turning colorless. Using UV-vis spectrophotometry, the detection limit of the Pt 4+ ion concentration was determined to be 6.23 μM in an aqueous solution of silver nanoprism particles. The proposed method was applied for detecting Pt 4+ ions in tap water samples.