Abstract

In this work, a new type of ultra-light carbon foams was adapted to adsorb and purify industrial emulsified oil wastewater which is difficult to be treated effectively. The effects of carbon foams dosage, contact time, temperature, initial concentrations of emulsified oil and pH on the adsorption carbon foams capacity and removal efficiency of emulsified oil were systematically studied. Combined SEM, FTIR and XPS analyses, the adsorption kinetics and adsorption isotherms were used to characterize the adsorption law on emulsified oil, and the kinetic mechanism of carbon foams was also discussed. The results showed that the maximum adsorption capacity of carbon foams and the removal efficiency could reach 1627 mg/g and 99% when 0.5% (W/V) carbon foams were added in the wastewater with the 2020 mg/L of emulsified oil concentration. Besides, adsorption kinetics and isotherm followed the pseudo-second-order kinetic model and the Freundlich isotherm model, and the apparent activation energy Ea and ΔGo were 14.67 KJ/mol and less than 0 at different temperatures, indicating that the adsorption process of emulsified oil on the carbon foams was a spontaneous physical-chemical adsorption process.

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