Response surface methodology and reaction optimization to product zero-valent iron nanoparticles for organic pollutant remediation

Optimization of magnetic nano-iron production by Aspergillus flavipes MN956655.1 using response surface methodology and evaluation of their dye decolorizing and antifungal activities

“…The reported saturation magnetization value of the synthesized particles was 165.2 memu/g. This value is higher than the magnetization value reported by Kheshtzar et al for zero-valent iron nanoparticles synthesized by extracts of green tea leaves which was around 80 memu/g 34 . Also, that recorded value is better than the magnetization value reported for iron oxide nanoparticles coated with green tea polyphenols and those synthesized by tannin extract from Acacia mearnsii where their values were 61 memu/g 35 and 3.2 memu/g 36 respectively.…”

“…All previous signals reveal possible involvement of flavonoids, phenolic 4 and alcoholic compounds in synthesis and capping of iron nanoparticles. In addition to that, common bands have been observed in ~ 1334 and ~ 1311 cm −1 which may belong to aromatic C–N stretching 34 , 37 , 38 and that indicates a possible role of the aromatic nitrogenous compounds in synthesis and capping process. FT-IR spectrum of biosynthesized iron nanoparticles showed the appearance of unique beaks in 400–600 cm −1 range which correlated to Fe–O stretching vibration mode 31 , 34 , 40 and that confirming the formation of magnetite iron nanoparticles.…”

“…In addition to that, common bands have been observed in ~ 1334 and ~ 1311 cm −1 which may belong to aromatic C–N stretching 34 , 37 , 38 and that indicates a possible role of the aromatic nitrogenous compounds in synthesis and capping process. FT-IR spectrum of biosynthesized iron nanoparticles showed the appearance of unique beaks in 400–600 cm −1 range which correlated to Fe–O stretching vibration mode 31 , 34 , 40 and that confirming the formation of magnetite iron nanoparticles. A further unique beak has been observed at 3734 cm −1 which corresponds to nonbonded hydroxyl group O–H 37 , 38 stretch that may be due to residual water which surrounds the nanoparticles.…”

“…Also, that recorded value is better than the magnetization value reported for iron oxide nanoparticles coated with green tea polyphenols and those synthesized by tannin extract from Acacia mearnsii where their values were 61 memu/g 35 and 3.2 memu/g 36 respectively. These reduced values were explained by the diamagnetic effect of capping biological materials and amorphous state of the prepared iron nanoparticles 34 . Thus, the obtained results reveal an enhanced magnetic property for the biosynthesized iron nanoparticles compared to other green synthesized ones giving them more suitable characteristics for the remediation applications as the magnetic manipulation is required.…”

The Dual role of Nanomaterials in the Environment

“…28 Because of the characteristics of NPs, they offer a promising solution for the remediation of organic contaminants. One of the most used NPs for organic remediation is zero-valent iron nanoparticles (ZVINPs) as described by different authors [29][30][31][32][33] , since they are Fenton-like catalysts as shown in the following equations 33 : as a robust catalyst for the remediation of 4-nitrophenol (4-NP) in water. Besides de good degradation efficiency, the authors reported an excellent outstanding cyclability (10 recycling runs), and observable long-term durability.…”