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We report a facile and green route for the synthesis of superparamagnetic magnetite nanoparticles (Fe 3 O 4 NPs) using aqueous leaf extract of Zanthoxylum armatum DC. for efficient adsorption of organic pollutant, methylene blue (MB). The phytochemicals present in the aqueous leaf extract Zanthoxylum armatum DC. are not only responsible for the formation of Fe 3 O 4 NPs, but also act as capping agent for Fe 3 O 4 NPs. The formation of Fe 3 O 4 NPs was confirmed by a range of spectroscopy and microscopy techniques such as UVvisible spectroscopy, Fourier transform infrared spectroscopy, powder X-ray diffraction (XRD), field emission-scanning electron microscopy (FE-SEM), transmission electron microscopy (TEM) and vibrating sample magnetometer. The spectroscopic results indicated the successful formation of Fe 3 O 4 NPs. FE-SEM and TEM images revealed the spherical shape with particle size of 17 nm. Fe 3 O 4 NPs showed superparamagnetism. Green synthesized Fe 3 O 4 NPs shows enhanced adsorption efficiency toward MB from contaminated water. The kinetic data of adsorption fitted very well with the pseudo-second order. The adsorption isotherm data fitted well to Langmuir isotherm and it was found to be 10.4712 mg/g adsorption capacity and it implies that the chemisorptions of MB on to Fe 3 O 4 NPs.

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This paper describes a green one-pot synthesis of L-Serine (L-Ser) capped magnetite nanoparticles (Fe 3 O 4 NPs) and its potential application for adsorption of RhB dye from aqueous solution. The surface property, structure, morphology and magnetic properties of as prepared L-Ser capped Fe 3 O 4 NPs were characterised through UV-Visible spectroscopy, Fourier transform-infrared spectroscopy, X-Ray Diffraction (XRD), scanning electron microscope, transmission electron microscope (TEM) and vibrating sample magnetometer (VSM). The XRD results were indicated the formation of high crystalline spinel type Fe 3 O 4 NPs. TEM images were shown the spherical shape of L-Ser capped Fe 3 O 4 NPs with particle size of 5.9 nm. The VSM curve showed the superparamagnetic behaviour of L-Ser capped Fe 3 O 4 . A plausible interaction mechanism of L-Ser and Fe 3 O 4 NPs was also investigated. L-Ser capped Fe 3 O 4 NPs due to its large surface area and a strong magnetism was shown potential adsorption efficiency towards RhB dye from aqueous solution. The adsorption isotherm data fitted well with Langmuir isotherm model and the monolayer adsorption capacity (q e,exp ) was found to be 6.82 mg/g at pH 7.4 and 300 K. The experimental kinetic data fitted very well with the pseudo-second-order model. The thermodynamic studies reveal that adsorption efficiency is critically dependent on temperature.

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