Hameed, K. K.; Mohammed, W. T.; Mohammed, S. J. Photocatalytic Treatment of Petroleum Refinery Wastewater by ZnO Nanoparticles Immobilized on a Concrete Substrate. IJCPE 2025, 26 (3), 113-122. https://doi.org/10.31699/IJCPE.2025.3.10.