Abstract
Deep oxidative desulfurization (ODS) using deep eutectic solvents (DESs) was a promising and environmentally friendly technique. Herein, we report an innovative and straightforward approach for achieving efficient oxidative desulfurization using DESs. These DESs serve as all-in-one systems, encompassing catalysts, oxidants, and solvents. The results demonstrate the excellent desulfurization performance of a DES derived from meta-chloroperoxybenzoic acid (mCPBA) and dimethylethanolamine (DMAE) for the removal of dibenzothiophene (DBT) from model oil. The use of multi-component DES systems enhances efficiency and reduces toxicity compared to individual solvent components, resulting in deep desulfurization levels. The influence of crucial extraction parameters, such as extraction time, temperature, and amount of DES, was investigated. The results demonstrated that the mCPBA/DMAE-based DES exhibited the highest desulfurization efficiency, reaching up to 99 % under optimal conditions (60 °C, 90 min, and 1 mL of DES). Moreover, the exceptional stability and reusability of DESs were confirmed, as they maintained sustained desulfurization efficiency even after six cycles of reuse.
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