Ordered mesoporous carbon immobilized nano zero-valent iron in bromate removal from aqueous solution

• We used nano Fe0/OMC for bromate removal.
• Enhanced degradation of bromate by nano Fe0/OMC.
• The equilibrium time was very short.
• We make clear the adsorption isotherm, kinetics for bromate removal by nano Fe0/OMC.

The present work aims to investigate bromate removal from water with the application of a material nano Fe0/OMC (ordered mesoporous carbon) composite, under various experimental conditions. The effect of temperature, react time, bromate concentration, etc. on bromate removal efficiency was studied. Removal efficiency of bromate by nano Fe0/OMC achieved 96.1% with a contact time of 10 min at 298 K. Reduction action dominates the whole process with a little adsorption accompanied, and approximately 90% bromate was restored to bromide. Kinetics models were used to correlate the kinetics experimental data and the kinetics parameters reveal that the kinetics data were well fitted to pseudo-second-order model. The maximum bromate uptake at 298 K was found to be 25.9 mg/g at the initial bromate concentration 10 mg/L, but it changed little with a decrease in temperature. Equilibrium isotherms were analyzed by the Freundlich and Langmuir isotherm models. The data fit favorable to the Langmuir isotherms with high-correlation coefficients (0.941–0.998). The present work shows that the nano Fe0/OMC composite would be a promising material in the study of drinking water purification.