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An optimum large specific surface area of sulfur-doped graphitic carbon nitride nanoflakes modified glassy carbon electrode (S-g-C₃N₄/GCE) is reported with promising lead ion (Pb²⁺) detection capability. This sensor was designed and fabricated using thermal polycondesation reaction_. In terms of high selectivity Pb²⁺ performance, we noted that the sensor exhibited appreciable detection limit of 3.0 × 10⁻⁹ mol L⁻¹ (S/N = 3) within the ionic specimen concentration range of 7.5 × 10⁻⁸ ~ 2.5 × 10⁻⁶ mol L⁻¹ and 2.5 × 10⁻⁶ ~ 1 × 10⁻³ mol L⁻¹. Corroborated by DFT calculations, we propose that the strong interaction of S-g-C₃N₄ interface and Pb²⁺ plays an important role to generate the aforementioned sensing characteristics. In practice, we conceived high detection of Pb²⁺ ions that reside in lake-water and mineral samples in which percentage recovery of 88–103 can be obtained under high repetition rate. Thus …