This study examines the influence of applying a solvent-free, scalable mechanical ball-milling process on the photocatalytic performance of metal-free graphitic carbon nitride (g-C₃N₄). Structural characterization reveals that optimization of the milling time enables particle size reduction and increases the specific surface area from 5.91 to 9.16 m²g⁻¹without affecting the inherent crystal phase. Photocatalytic analyses of Methylene Blue degradation demonstrate a pseudo-first-order reaction for the 4 h milled sample, together with a 73.73% degradation efficiency after 45 min under ultraviolet light irradiation. This is equivalent to a four-fold higher rate constant of 0.01937 min⁻¹ compared with those achieved using bulk g-C₃N₄ and numerous noble-metal hybrids reported in recent literature. These findings provide useful and effective guidelines toward establishing high-performance, low-cost, metal-free photocatalysts for the rapid degradation of hazardous dyes in wastewater.