生物炭-白土吸附剂对鱼油中3-氯丙醇酯的吸附性能研究

3-氯丙醇酯（3-MCPDE）是油脂生产加工中的新型污染物，其污染问题值得行业关注。为控制鱼油精炼过程中蓄积的3-MCPDE，本研究采用活性白土与梭子蟹壳加工副产物按1∶5(w∶w)混合进行烧制，得到吸附3-MCPDE的生物炭-白土吸附剂（CBW）。通过比表面积表征（BET）、扫描电镜（SEM）和傅里叶红外光谱法（FT-IR）对该复合材料进行理化分析，研究固液比、吸附温度、吸附时间对鱼油中3-MCPDE吸附的影响，探讨其吸附动力学及吸附机理。结果表明，与单一生物炭相比，复合吸附剂的比表面积和平均孔径增大，且负载了新的官能团，吸附性能明显提高。当吸附温度达到80℃、固液比为1∶25(w∶w)、吸附时间为50 min时，CBW对鱼油中3-MCPDE的吸附效果最佳，吸附率高达55.32%，且再生后吸附性能较好。CBW对鱼油中3-MCPDE的吸附过程更符合准二级动力学模型，存在物理和化学吸附。对不同浓度3-MCPDE的脱除过程更符合Freundlich等温吸附模型，初步表明吸附鱼油中3-MCPDE的过程为多层吸附。本研究为吸附脱除油脂中3-MCPDE提供了一种新的吸附材料，对鱼油生产中3-MC...

Adsorption Properties of 3-Monochloropropane-1,2-diol Esters in Fish Oil by Biochar-clay Adsorbent

3-Monochloropropane-1，2-diol esters （3-MCPDE） is a new pollutant in oil production and processing， and its pollution problem is worthy of attention in oil processing industry. In order to control the accumulation of 3-MCPDE in the process of fish oil refining and processing， activated white clay and by-products of shuttle crab shell were fired at 1∶5 （w∶w） to obtain the biochar-clay adsorbent （CBW） for adsorption of 3-MCPDE. The physical and chemical properties of the composite materials were analyzed by Brunauer-Emmett-Teller surface area （BET）， Scanning electron microscopy （SEM） and Fourier infrared spectroscopy （FT-IR）. The effects of solid-liquid ratio， adsorption temperature and adsorption time on 3-MCPDE in fish oil were studied， and its adsorption mechanism was discussed by adsorption kinetics. The results showed that the adsorption performance of CBW was significantly improved compared with a single adsorbent. The specific surface area and average pore size of CBW were increased， and new functional groups were loaded. When the optimal adsorption temperature was 80 ℃， the ratio of solid to liquid was 1∶25（w∶w）， and the adsorption time was 50 min， the adsorption effect of 3-MCPDE in fish oil was the best， and the adsorption rate reached to 55.32±1.3%， and CBW has better regeneration adsorption performance. As regards the adsorption behaviour of 3-MCPDE in fish oil， the CBW better corresponded to the quasi-level 2 kinetic model and the Freundlich isothermal adsorption model， which indicate the presence of physical and chemical adsorption. This study provided a new adsorption material for 3-MCPDE in the fish oil， and provided support for the risk prevention and control of 3-MCPDE in fish oil production and the quality improvement of fish oil products.