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| Adsorption performance of DBP in edible oil by cellulose acetate loaded on activated carbon and its mechanism |
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| DOI：10.12166/j.zgyz.1003-7969/2020.06.013 |
| KeyWord:edible oil DBP activated carbon modified activated carbon adsorption performance mechanism |
| FundProject:国家自然科学基金青年基金项目（31601505）；湖北省技术创新专项重大项目（2019ABA105）；农产品加工与转化湖北省重点实验室开放课题（2018HBSQGDKF04） |
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| Abstract: |
| Cellulose acetate (CA) was loaded on the surface of activated carbon (AC) to prepare modified activated carbon (MAC). The structure and apparent morphology of MAC were characterized by scanning electron microscopy （SEM）, specific surface and aperture analyzer, Fourier transform infrared spectrometer and elemental analyzer. The effects of mass ratio of CA to AC in the adsorbent MAC, dosage of adsorbent, adsorption temperature and adsorption time on the adsorption of dibutyl phthalate (DBP) in edible oil by MAC were discussed. The adsorption performance and mechanism of DBP in edible oil were studied through adsorption kinetics and thermodynamic analysis. The results showed that the optimal conditions of adsorbing DBP in edible oil by MAC were obtained as follows: mass ratio of CA to AC 0.025∶ 1, dosage of adsorbent 4% (based on the oil mass), adsorption temperature 130 ℃, and adsorption time 50 min.Under the optimal conditions, the adsorption amount of MAC was 2117 μg/g and the adsorption rate reached 40.48%, which was better than that of the unmodified activated carbon (15.10 μg/g, 31.36%).The adsorption kinetics and thermodynamics analysis showed that the quasi-second-order kinetic model could better describe the adsorption process, indicating that the main influence on the adsorption process was the adsorption mechanism rather than the mass transfer mechanism, and the Langmuir equation could more accurately describe the adsorption process. |
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