生物炭-白土吸附剂对鱼油中3-氯丙醇酯的吸附性能研究

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

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-MCPDE的风险防范和控制及鱼油产品的品质提升提供了技术支持。

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.