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| 活性炭负载醋酸纤维素对食用油中DBP的吸附性能及其机理 |
| 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 |
| 中文关键词: 食用油；DBP 活性炭；改性活性炭；吸附性能；机理 |
| 英文关键词:edible oil DBP activated carbon modified activated carbon adsorption performance mechanism |
| 基金项目: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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| 中文摘要: |
| 将醋酸纤维素（CA）负载在活性炭（AC）表面制备成改性活性炭（MAC）。采用扫描电镜、比表面及孔径分析仪、傅里叶变换红外光谱仪和元素分析仪对MAC的结构和形貌进行表征。重点探讨了吸附剂MAC中CA与AC质量比、吸附剂用量、吸附温度和吸附时间对MAC吸附食用油中邻苯二甲酸二丁酯（DBP）的影响，并且通过吸附动力学和热力学分析，研究MAC对食用油中DBP的吸附性能及机理。结果表明，MAC对食用油中DBP吸附的最佳条件为：CA与AC质量比0.025∶ 1，吸附剂用量为油质量的4%，吸附温度130 ℃，吸附时间50 min。在最佳条件下，MAC对DBP的吸附量为21.17 μg/g、吸附率达到40.48%，优于相同条件下AC的（15.10 μg/g、31.36%）。吸附动力学和热力学分析表明，准二级动力学模型能更好地描述MAC的吸附过程，表明影响吸附过程的主要是吸附机理而非传质机理，Langmuir方程能更准确地描述其吸附过程。 |
| 英文摘要: |
| 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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