单宁酸稳定纳米铁的制备及其迁移性研究  

Study on Preparation and Migration of Tannic Acid-Stabilized Nanoscale Iron

作　　者：单广波 蒋广安 徐佰青 赵一山 李铁龙[2] 刘海娣[2] Shan Guangbo;Jiang Guang’an;Xu Baiqing;Zhao Yishan;Li Tielong;Liu Haidi(SINOPEC(Dalian)Research Institute of Petroleum and Petrochemicals Co.,Ltd.,Liaoning,Dalian,116045;College of Environmental Science and Engineering,Nankai University,TianJin,300350)

机构地区：[1]中石化(大连)石油化工研究院有限公司,辽宁大连116045 [2]南开大学环境科学与工程学院,天津300350

出　　处：《安全、健康和环境》2024年第2期22-30,共9页Safety Health & Environment

基　　金：中国石化科技部课题(319005);地下水污染扩散阻止及降解技术研究。

摘　　要：制备了单宁酸与铁离子物质的量的比分别为0.0125,0.0250,0.0500,0.1000,0.2000的单宁酸稳定的纳米铁(TA-nZVI),通过TEM、XRD、Zeta和磁性来分析TA-nZVI的形貌、粒径、成分、稳定性和分散性。相对于未添加单宁酸为稳定剂制备的纳米铁(Bare-nZVI),TA-nZVI是一种粒径主要分布在40~70 nm之间的特殊团簇结构,且随着单宁酸用量的增加,相应纳米铁颗粒的Zeta电位数值增加,颗粒的分散性和抗氧化性明显提高。通过研究TA-nZVI的沉降实验和迁移实验发现,随着单宁酸用量的增加,纳米材料的附着效率降低,颗粒在沙柱中处于“非有利沉降条件”,从而使颗粒的迁移能力得到显著提高。其中,单宁酸与铁离子摩尔比例为0.2000条件下制备的纳米铁颗粒通过动态柱实验后,总铁迁出率达到97.56%,几乎无截留现象,是相同条件下Bare-nZVI的17.96倍,具有一定的环保应用价值。The tannic acid-stabilized nano-iron(TAnZVI)was prepared with the molar ratio of tannic acid to iron of 0.0125,0.0250,0.0500,0.1000,0.2000 respectively.The morphology,particle size,composition,stability and dispersion of TA-nZVI were analyzed by TEM,XRD,Zeta and magnetism.Compared with the nano-iron(Bare-nZVI)prepared without tannic acid as stabilizer,TAnZVI was a special cluster structure whose particle size was mainly distributed between 40 and 70 nm.With the increase of tannic acid dosage,the Zeta potential value of the corresponding nano-iron particles increased,and the dispersion and oxidation resistance of the particles were significantly improved.By studying the sedimentation and migration experiments of TA-nZVI,it was found that with the increase of the amount of tannic acid,the adhesion efficiency of nanomaterials decreased,and the particles were in“non-favorable settling conditions”in the sand column,so that the migration ability of particles was significantly improved.Among them,the iron nanoparticles prepared under the condition of 0.2000 mole ratio of tannic acid to iron ion through the dynamic column experiment,the total iron migration rate reached 97.56%,almost no retention phenomenon,17.96 times that of Bare-nZVI under the same condition,which had certain environmental application value.

关 键 词：单宁酸 纳米铁 沉降 迁移 X射线衍射 

分 类 号：X53[环境科学与工程—环境工程]