Adsorptive Removal of 1,2-Dichloroethane Using Novel Oleogel Adsorbents: Synthesis Strategy and Adsorption Mechanism Insight

The DCE adsorption behavior and mechanism were investigated through dynamic adsorption experiments, multimodel kinetic fitting, and spectral analysis at multiple temperatures. The results showed that the 10 wt % 12-HSA/DOA Oleogel achieved a DCE adsorption capacity of 154.4 mg g^–1 at 25 °C and reached 201.9 mg g^–1 at 15 °C, which is comparable to those of previously reported adsorbents. Characterization and adsorption experiments demonstrated that the adsorbent exhibited a stable three-dimensional crystalline architecture, excellent oil retention (up to 98% after centrifugation), and favorable thermal stability below 150 °C. Meanwhile, DCE adsorption on Oleogel adsorbents involves significant intermolecular interactions (e.g., dipole–dipole and hydrogen bonding) rather than a purely physical process, and their surface is enriched with exposed functional groups, such as carbonyl and carboxyl groups.

Further analysis indicated that the base oil was the dominant factor governing DCE adsorption performance, and the gelator type was the decisive factor influencing crystal morphology development. Notably, the contact angle of samples prepared from ethyl cellulose and dioctyl adipate reached 95.6°, suggesting potential for use in high-humidity environments.