Biogenic synthesis of ferric oxide nanoparticles using the leaf extract of Peltophorum pterocarpum and their catalytic dye degradation potential
Biogenic synthesis of ferric oxide nanoparticles using the leaf extract of Peltophorum pterocarpum and their catalytic dye degradation potential
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DOI：
10.1016/j.bcab.2019.101251
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发表时间：
2019-07-01
影响因子：
4
通讯作者：
Selvaraj, Raja
中科院分区：
文献类型：
--
作者：
Anchan, Sanjana;Pai, Shraddha;Selvaraj, Raja
植物介导的纳米颗粒绿色合成是一种既环保又廉价的方法，因为它利用了存在于各种植物部位的植物化合物作为还原剂和稳定剂。本文首次以紫杉叶提取物为原料制备了磁性氧化铁纳米颗粒（FONPs）。在FE-SEM图像中观察到具有团块的棒状FONPs。在能谱中发现了单质氧和铁的尖峰。XRD谱确定了FONPs的结晶度，并显示出γ和α - fe2o3相。平均晶粒尺寸为16.99 nm。BET分析发现，该材料具有较大的比表面积（66.44 m(2)/g），为中孔结构（孔径为7.92 nm）。热重分析结果表明，在加热到800℃时，样品失重20%，红外光谱显示出各种植物化合物和Fe-O的显著波段。研究了FONPs对亚甲基蓝染料的类fenton催化降解效率，在220min内去除率达到90%。实验结果符合二级模型，降解常数为0.0987 L/mg min。并以还原剂NaBH4为催化剂对MB染料的催化活性进行了评价。在27min内，染料的降解率达到了92%，结果最适合于一阶模型，动力学降解常数为0.0856min（-1）。因此，本文所获得的绿色合成FONPs可以作为纳米催化剂用于染料的降解，用于废水的修复。
Plant-mediated green synthesis of nanoparticles is an eco-friendly and cheap method since it makes use of phyto-compounds present in various plant parts as reducing and stabilizing agents. Herein, magnetic, ferric oxide nanoparticles (FONPs) were prepared by utilizing the leaf extract of Peltophorum pterocarpum for the first time. Rod-like FONPs with agglomerations were witnessed in FE-SEM images. Sharp peaks for elemental oxygen and iron were witnessed in EDS spectrum. XRD spectrum ascertained the crystallinity of the FONPs and showed both gamma and alpha-Fe2O3 phases. The average crystallite size was 16.99 nm. A large specific surface area (66.44 m(2)/g) was found in BET analysis and the FONPs were mesoporous (pore diameter = 7.92 nm). TGA results showed a 20% weight loss during heating up to 800 degrees C. FTIR spectrum showed significant bands for various phyto-compounds and Fe-O. The Fenton-like catalytic efficiency of FONPs was studied for the methylene blue dye degradation during which 90% removal was noticed within 220min. The experimental results were satisfactorily fitted into a second-order model with a degradation constant of 0.0987 L/mg min. Also, the catalytic activity of the FONPs was assessed for the removal of MB dye with the reducing agent NaBH4. A remarkable dye degradation (92%) was attained within 27min, and the results were best suited for a first-order model with a kinetic degradation constant of 0.0856min(-1). Therefore, the green-synthesized FONPs obtained here could be used in the degradation of dyes as nanocatalysts for the remediation of wastewater.