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  

Adsorption Characteristics and Mechanism of Hydrochloric Acid Modified Okara Insoluble Dietary Fiber to Nitrite

作　　者：王金玉 王赛男 卢佳宏 张莹 房佳琦 于寒松[1,2] 程志强 张钊[4] WANG Jin-yu;WANG Sai-nan;LU Jia-hong;ZHANG Ying;FANG Jia-qi;YU Han-song;CHENG Zhi-qiang;ZHANG Zhao(College of Food Science and Engineering,Jilin Agricultural University,Changchun 130118,China;National Soybean Industry Technology System Processing Laboratory,Changchun 130118,China;College of Resources and Environment,Jilin Agricultural University,Changchun 130118,China;Shandong Jiahua Biotechnology Co.,Ltd.,Liaocheng 252400,China)

机构地区：[1]吉林农业大学食品科学与工程学院,吉林长春130118 [2]国家大豆产业技术体系加工研究室,吉林长春130118 [3]吉林农业大学资源与环境学院,吉林长春130118 [4]山东嘉华生物科技股份有限公司,山东聊城252400

出　　处：《大豆科学》2022年第4期463-471,共9页Soybean Science

基　　金：国家现代农业产业技术体系(CARS-04);中青年科技创新创业卓越人才(团队)项目(创新类)(20210509015RQ)。

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。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.

关 键 词：亚硝酸盐 膳食纤维 结构特征 吸附 

分 类 号：TS210.9[轻工技术与工程—粮食、油脂及植物蛋白工程]