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
单广波 1蒋广安 1徐佰青 1赵一山 1李铁龙 2刘海娣2
作者信息
- 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
- 折叠
摘要
制备了单宁酸与铁离子物质的量的比分别为 0.012 5,0.025 0,0.050 0,0.100 0,0.200 0 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0.200 0 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.
Abstract
The tannic acid-stabilized nano-iron(TA-nZVI)was prepared with the molar ratio of tannic acid to iron of 0.012 5,0.025 0,0.050 0,0.100 0,0.200 0 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-nZ-VI)prepared without tannic acid as stabilizer,TA-nZVI 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 po-tential value of the corresponding nano-iron particles increased,and the dispersion and oxidation resist-ance 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 col-umn,so that the migration ability of particles was sig-nificantly improved.Among them,the iron nanoparti-cles prepared under the condition of 0.200 0 mole rati-o of tannic acid to iron ion through the dynamic col-umn 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Key words
tannic acid/nanoscale iron/sedimenta-tion/migration/XRD引用本文复制引用
基金项目
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()
出版年
2024
国家科技期刊平台
NSTL
万方数据