| Summary: | This study explores the facile, template-free synthesis of S-doped g-C<sub>3</sub>N<sub>4</sub> pinhole nanosheets (SCNPNS) with porous structure for fluorescence sensing of Ag<sup>+</sup> ions and visible-light photocatalysis of dyes. As-synthesized SCNPNS samples were characterized by various analytical tools such as XRD, FT-IR, TEM, BET, XPS, and UV⁻vis spectroscopy. At optimal conditions, the detection linear range for Ag<sup>+</sup> was found to be from 0 to 1000 nM, showing the limit of detection (LOD) of 57 nM. The SCNPNS exhibited highly sensitive and selective detection of Ag<sup>+</sup> due to a significant fluorescence quenching via photo-induced electron transfer through Ag<sup>+</sup>⁻SCNPNS complex. Moreover, the SCNPNS exhibited 90% degradation for cationic methylene blue (MB) dye within 180 min under visible light. The enhanced photocatalytic activity of the SCNPNS was attributed to its negative zeta potential for electrostatic interaction with cationic dyes, and the pinhole porous structure can provide more active sites which can induce faster transport of the charge carrier over the surface. Our SCNPNS is proposed as an environmental safety tool due to several advantages, such as low cost, facile preparation, selective recognition of Ag<sup>+</sup> ions, and efficient photocatalytic degradation of cationic dyes under visible light.
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