双极性MgO纳米棒的制备、表征及其在原糖回溶糖浆脱色的应用  

Preparation and Characterization of Bipolar MgO Nanorods and Its Application in Decolorization of Raw Sugar-Redissolved Syrup

作　　者：蔡全龙 程昊 唐婷范 张文康 卫政涛 李利军 CAI Quanlong;CHENG Hao;TANG Tingfan;ZHANG Wenkang;WEI Zhengtao;LI Lijun(College of Biological and Chemical Engineering,Guangxi Key Laboratory of Green Processing of Sugar Resources,Guangxi University of Science and Technology,Liuzhou 545006,Guangxi,China;Provincial-Ministerial Collaborative Innovation Center for Sugar Industry,Nanning 530004,Guangxi,China)

机构地区：[1]广西科技大学生物与化学工程学院,广西糖资源绿色加工重点实验室,广西柳州545006 [2]蔗糖产业省部共建协同创新中心,广西南宁530004

出　　处：《食品研究与开发》2025年第3期125-131,共7页Food Research and Development

基　　金：广西自然科学基金面上项目(2022GXNSFAA035490);广西自然科学基金重点项目(2019GXNSFDA245025);广西糖资源绿色加工重点实验室主任基金项目(GXTZYZR202202)。

摘　　要：该试验以MgCl_(2)·6H2O和MgO为原料,制备碱式MgCl_(2)纳米棒,将其作为前驱物,采用沉淀转化法制备Mg(OH)2纳米棒,通过热分解法制备MgO纳米棒。通过扫描电子显微镜(scanning electron microscope,SEM)、X射线衍射(X-ray diffraction,XRD)仪、傅里叶变换红外光谱(Fourier transform infrared spectrometer,FT-IR)仪表征分析得出产物是直径为150~250 nm、长度为6~10μm的单晶MgO纳米棒,为棒状纳米级。以脱色率为评价指标,分别考察MgO纳米棒用量、脱色温度、脱色时间和pH值4个因素对原糖回溶糖浆脱色率的影响,得出最佳条件为MgO纳米棒用量0.03 g、脱色温度60℃、脱色时间110 min、pH5.0。该MgO纳米棒对原糖回溶糖浆溶液的脱色率达到(91.92±1.70)%。空白试验证明MgO纳米棒对原糖回溶糖浆的脱色率明显高于市售MgO的脱色率[(17.93±2.04)%]。该MgO纳米棒对原糖回溶糖浆溶液中色素的吸附试验表明,MgO纳米棒吸附动力学符合准一级动力学模型,吸附行为符合Langmuir等温吸附模型,为单分子层吸附。In this experiment,alkaline MgCl_(2)nanorods were prepared from MgCl_(2)·6H2O and MgO,which were used as precursors to prepare Mg(OH)2 nanorods by precipitation transformation and MgO nanorods by thermal decomposition.The products were subjected to analysis by using a scanning electron microscope(SEM),an X-ray diffraction(XRD)instrument,and a Fourier transform infrared spectrometer(FT-IR).The products were obtained as single-crystal MgO nanorods with a diameter of 150-250 nm and a length of 6-10μm,exhibiting rod-like nanoscale morphology.The decolorization rate was employed as the evaluation index to investigate the effects of four factors,namely MgO nanorod dosage,decolorization temperature,decolorization time,and pH on the decolorization rate of raw sugar-redissolved syrup.The optimal conditions were found to be a MgO nanorod dosage of 0.03 g,a decolorization temperature of 60℃,a decolorization time of 110 min,and a pH of 5.0.The MgO nanorods demonstrated a decolorization rate of(91.92±1.70)%for the raw sugar-redissolved syrup.The results of the blank test demonstrated that the decolorization rate of MgO nanorods on the raw sugar-redissolved syrup was markedly superior to that of the commercially available MgO,which exhibited a decolorization rate of(17.93±2.04)%.The adsorption test of this MgO nanorod material on pigments in raw sugar-redissolved syrup demonstrated that the adsorption kinetics of the MgO nanorods exhibited conformity with the quasi-primary kinetics model.Furthermore,the adsorption behaviors demonstrated conformity with the Langmuir isothermal adsorption model,indicating mono-molecular layer adsorption.

关 键 词：双极性MgO纳米棒 原糖回溶糖浆 脱色性能 动力学模型 吸附 

分 类 号：TS2[轻工技术与工程—食品科学与工程]