摘要
以石榴叶提取物(PG)作为还原剂和稳定剂,采用一步法绿色合成得到铁纳米颗粒(FeNPs)。通过X射线衍射(XRD)、扫描电子显微镜(SEM)、X射线能谱(EDS)、Zeta电位、X射线光电子能谱(XPS)和BET等表征技术,研究了铁盐前驱体中不同阴离子对合成FeNPs的影响,揭示了其对孔雀石绿(MG)去除率的影响机制。结果表明:不同阴离子合成的FeNPs对MG的去除率为:R[PG-Fe_(2)(SO_(4))_(3)]>{R[PG-Fe(NO_(3))_(3)],R[PG-FeCl_(3)]}>>R[PG-FePO_(4)];PO_(4)^(3-)与Fe^(3+)之间的静电相互作用强烈,导致PG中的多酚无法与FePO_(4)络合,从而形成黑色FeNPs,因此PG-FePO_(4)的活性最低;由于PG提取液中酚羟基的配位和还原作用,其他阴离子合成的FeNPs以无定型的(Fe(Ⅱ)/Fe(Ⅲ)-多酚)配合物的形式存在;尺寸均匀、粒径较小的FeNPs对提高MG去除率起到关键作用,而其表面元素组成、Zeta电位高低影响不大。
Iron nanoparticles(FeNPs)were synthesized using a one-step green method with pomegranate leaf extract(PG)as a reducing and stabilizing agent.The effects of different anions in the iron salt precursor on the synthesis of FeNPs and their impact on the removal efficiency of malachite green(MG)were studied using characterization techniques such as X-ray diffraction(XRD),scanning electron microscopy(SEM),energy-dispersive X-ray spectroscopy(EDS),Zeta potential,X-ray photoelectron spectroscopy(XPS),and BET.The results showed that the removal efficiency of MG by FeNPs synthesized with different anions follows the order:R[PG-Fe_(2)(SO_(4))_(3)]>{R[PG-Fe(NO_(3))_(3)],R[PG-FeCl_(3)]}>>R[PG-FePO_(4)].The strong electrostatic interaction between PO_(4)^(3-) and Fe^(3+)prevented the complexation of polyphenols in PG with FePO_(4),resulting in the lowest activity of PG-FePO_(4).The coordination and reduction of phenolic hydroxyl groups in PG extract led to the formation of amorphous(Fe(Ⅱ)/Fe(Ⅲ)-polyphenol)complexes for FeNPs synthesized with other anions.Uniform size and smaller particle size of FeNPs played a key role in enhancing the removal efficiency of MG,while the surface elemental composition and Zeta potential had little impact.
作者
胡玉
张楠
潘晓斌
张东
李莉
李诗莹
张玲帆
HU Yu;ZHANG Nan;PAN Xiaobin;ZHANG Dong;LI Li;LI Shiying;ZHANG Lingfan(Department of Chemistry and Environmental Engineering,Hanjiang Normal University,Shiyan 442000,China;Shiyan Hydrological and Water Resources Survey Bureau of Hubei Province,Shiyan 442000,China;School of Chemistry and Molecular Engineering,East China University of Science and Technology,Shanghai 200237,China)
出处
《华南师范大学学报（自然科学版）》
CAS
北大核心
2023年第6期63-70,共8页
Journal of South China Normal University(Natural Science Edition)
基金
湖北省高等学校优秀中青年科技创新团队计划项目(T201824)
汉江师范学院重点学科建设经费资助。
关键词
绿色合成
铁纳米颗粒
石榴叶
阴离子
孔雀石绿
green synthesis
iron nanoparticles
pomegranate leaf
anion
malachite green
