Photocatalytic activity of Strontium hydroxyapatite (SrHAP) was tested taking the degradation of p-nitrophenol (pnp) as a model reaction and its activity was compared with that of modified SrHAP (Ti⁴⁺ Substituted SrHAP and TiO₂ loaded SrHAP). The compounds were synthesized by reflux method and characterized by powder XRD, FT-IR, SEM, TEM, UV–vis DRS and BET surface area analyses. Absorption edge of SrHAP (∼320 nm) was found to be shifted to longer wavelength in the case of 5 mol%Ti-SrHAP and 20 wt% TiO₂-SrHAP. The photodegradation of p-nitrophenol studied using 365 nm UV source showed the photocatalytic activity trend 20 wt%TiO₂-SrHAP > Ti-SrHAP > SrHAP. Photodegradation intermediates were identified by UV–vis and HRLC-MS analysis and possible degradation pathways were proposed. Photocatalytic degradation of pnp catalyzed by SrHAP and TiO₂ loaded SrHAP followed hydroquinone route whereas, the process catalyzed by Ti⁴⁺ substituted SrHAP followed catechol route.