作　　者： ; ; (何其）; (朱良）; (董浩）; (李绍峰）;

机构地区： 华南理工大学轻工与食品学院

出　　处： 《现代食品科技》 2015年第9期138-144,共7页

摘　　要： 研究以不同非离子表面活性剂为分散剂,通过液相还原法制备纳米铁来改善其分散性及反应活性。本文分别以不同浓度的聚乙二醇(4000)、聚乙二醇(20000)和聚乙烯吡咯烷酮(PVP)为分散剂制备纳米铁,通过扫描电子显微镜(SEM)、X射线衍射仪(XRD)、傅立叶红外光谱仪(FT-IR)、双光束紫外可见分光光度计(UV)和原子吸收分光光度计(AAS)对产物及其去除Pb(Ⅱ)效果进行了表征和研究。SEM显示三种表面活性剂均在一定程度上提高了纳米铁的分散性,加入PEG-4000和PEG-20000制备的纳米铁均呈细小纤维状,加入PVP的纳米铁呈蓬松颗粒状;FT-IR表明三种表面活性剂在纳米铁形成过程中未发生化学变化,而是通过静电作用、范德华力等吸附或包覆在纳米铁表面;XRD表明三种表面活性剂的加入并未改变纳米铁的晶相;UV表明PEG-20000与PVP的分散效果优于PEG-4000;AAS表明加入3%的PEG-20000时,纳米铁对Pb(Ⅱ)去除效果最好,吸附容量约为229 mg/g。 Polyethylene glycol 4000(PEG-4000), PEG-20000, and polyvinyl pyrrolidone(PVP) at various concentrations were used as dispersants for the preparation of iron nanoparticles with a liquid-phase reducing method. The effects of these non-ionic surfactants as dispersants were investigated to improve product dispersibility and reactivity. Scanning electron microscopy(SEM), X-ray diffraction(XRD), Fourier transform infrared spectroscopy(FT-IR), double-beam UV-visible spectrophotometry(UV), and atomic absorption spectrophotometry(AAS) were used to characterize and investigate the product and its effectiveness in removing lead(II). SEM analysis showed that all three surfactants improved the dispersibility of iron nanoparticles. Fine, fibrous iron nanoparticles were attained after adding PEG-4000 and PEG-20000, whereas fluffy particulate iron nanoparticles were obtained after adding PVP. The FT-IR results indicated that the three surfactants did not undergo chemical reactions during iron nanoparticle formation. Instead, they attached to or coated the surface of the nanoparticles through electrostatic interaction or van der Waals forces. The results of XRD demonstrated that the surfactants had no influence on the crystal phase of iron nanoparticles, and the UV results indicated the dispersion effects of PEG-20000 and PVP were superior to that of PEG-4000. The AAS results showed that the maximum adsorption capacity of lead(II) reached 229 mg/g when iron nanoparticles were prepared by adding 3% PEG-20000.

关 键 词： 表面活性剂 纳米铁 液相还原法

领　　域： [一般工业技术] [化学工程]