WANG Jin-yu,WANG Sai-nan,LU Jia-hong,et al.Adsorption Characteristics and Mechanism of Hydrochloric Acid Modified Okara Insoluble Dietary Fiber to Nitrite[J].Soybean Science,2022,41(04):463-471.[doi:10.11861/j.issn.1000-9841.2022.04.0463]
盐酸改性豆渣不溶性膳食纤维对亚硝酸盐的吸附特性及机理
- Title:
- Adsorption Characteristics and Mechanism of Hydrochloric Acid Modified Okara Insoluble Dietary Fiber to Nitrite
- Keywords:
- nitrite; dietary fiber; structural characteristics; adsorption
- 文献标志码:
- A
- 摘要:
- 为研究HCl改性豆渣不溶性膳食纤维（HPIDF）对亚硝酸盐的吸附特性及机理，以亚硝酸盐为目标污染物，通过HCl改性HPIDF制备出HCl-HPIDF。采用粒度分析、扫描电子显微镜（SEM）、傅立叶变换红外（FT-IR）光谱、X-射线衍射（XRD）和热重分析对HCl-HPIDF的形貌结构进行表征，同时，测定HCl-HPIDF的基础组成成分，研究其在不同条件下其对NO-2吸附效果的影响以及吸附动力学、吸附热力学。结果可知：HCl-HPIDF相比酸改性前对NO-2的去除率提高了20.87%，蛋白质和灰分组成含量不同程度的减少，总膳食纤维的含量相对增加。颗粒比表面积增大，表面由原来的褶皱沟壑状变为蜂巢孔洞状结构，暴露更多的含氧官能团且结晶度、热稳定性提高；吸附过程研究表明：HCl-HPIDF对NO-2的吸附动力学过程符合准二级动力学模型；Freundlich等温吸附模型可较好地描述HCl-HPIDF对NO-2的吸附过程，吸附热力学表明吸附过程为吸热过程且非自发进行；采用HCl改性HPIDF后，对NO-2的吸附去除率显著提高。
- Abstract:
- In order to study the adsorption characteristics and mechanism of HCl modified soybean residue to nitrite, the insoluble dietary fiber (HPIDF)， HCl-HPIDF was prepared by modifying HPIDF with nitrite as the target pollutant.The morphology and structure of HCl-HPIDF were characterized by particle size analysis， scanning electron microscopy (SEM)， Fourier Transform infrared spectroscopy (FT-IR)， X-ray diffraction (XRD)， and thermogravimetric analysis. Meanwhile， the basic composition of HCl-HPIDF was determined， and its influence on NO-2 adsorption effect under different conditions， adsorption kinetics and adsorption thermodynamics were studied. The results showed that the removal rate of NO-2 by HCl-HPIDF was increased by 20.87% compared with that before modification and the content of protein and ash decreased to varying degrees， while the content of total dietary fiber increased relatively. The specific surface area of HCl-HPIDF particles increased. The surface of HCl-HPIDF particles changed from folds to honeycomb holes， exposed more oxygen-containing functional groups， and increased crystallinity and thermal stability. The adsorption kinetics of HCl-HPIDF for NO-2 accords with the quasi-second-order kinetic model. Freundlich isothermal adsorption model can describe the adsorption process of NO2 by HCl-HPIDF， and the adsorption thermodynamics showed that the adsorption process was endothermic and non-spontaneous. After HCl modification of HPIDF， the adsorption removal rate of NO2 was significantly improved， which provided a theoretical basis for the subsequent adsorption of nitrite in the human body by soybean residue insoluble dietary fiber as a natural adsorbent.
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备注/Memo
收稿日期：2022-01-17