Sneha, O.Isloor, A.M.Martis, G.J.Satishkumar, P.Mugali, P.S.2026-02-032024Advances in Environmental Technology, 2024, 10, 4, pp. 315-32524766674https://doi.org/10.22104/aet.2024.6957.1907https://idr.nitk.ac.in/handle/123456789/20876Contamination of water resources by dyes is a potential peril to humans and the ecosystem. Photocatalytic decomposition is one of the efficient ways to remove hazardous dyes present in water. CaCO<inf>3</inf> and TiO<inf>2</inf> nanoparticles have been synthesized from calcium chloride and sodium carbonate using a precipitation method and sol-gel technique, respectively. Synthesized CaCO<inf>3</inf> and TiO<inf>2</inf> nanoparticles were analysed using X-ray diffraction (XRD), ultraviolet visible (UV-Vis) spectroscopy, scanning electron microscopy (SEM), and energy dispersive X-ray spectroscopy (EDX). The experimental results showed that the synthesized CaCO<inf>3</inf> nanoparticles were of calcite and the TiO<inf>2</inf> nanoparticles of anatase. Polysulfone (PSF) composite membranes embedded with CaCO<inf>3</inf> and TiO<inf>2</inf> nanoparticles were prepared systematically. These synthesized nanoparticles and their embedded PSF membranes were effectively utilized for the photocatalytic decomposition of the reactive black 5 (RB 5) dye. 88.8% and 23.6% degradation of RB 5 dye was observed for TiO<inf>2</inf> and CaCO<inf>3</inf> nanoparticles, respectively. However, it was observed that the TiO<inf>2</inf> and CaCO<inf>3</inf> nanoparticle incorporated PSF membranes showed a lower photodegradation of 60.4% and 18.37%, respectively, due to the masking of the nanoparticles by the polymer matrix. The direct usage of the nanoparticles showed improved photodegradation properties. © 2024 Advances in Environmental Technology (AET).Calcium CarbonateNanoparticlePolysulfone MembraneTitanium Dioxide