Mn–Co/Al ₂ O ₃ composite for heavy metal removal from petroleum refinery wastewater

A mesoporous Mn–Co/Al ₂ O ₃ composite with a high surface area (276 m ² g ⁻¹ ) achieved efficient removal of multiple heavy metals from real petroleum refinery wastewater, demonstrating excellent adsorption, reusability, and fixed-bed performance.