In this study, nanoparticles powder of magnetite (Fe3O4), which has spinel structure, are synthesized by coprecipitation method. In the first section, nanoparticles of ferric ferrite have been prepared in the different condition such as precipitate agent of NaOH or NH 4 OH, temperature, pH and argon atmosphere. Then, in all the synthesized samples, the structure and magnetic properties of the samples, has been studied by using various tools such as X-ray diffraction (XRD), Furier Transform Infrared (FTIR), thermogravimetry (TG), vibrating sample magnetometer (VSM), and Field Emission Scanning Electron Microscope (FESEM). The raw materials used in the first section include iron chloride, iron sulfate, NaOH, NH4OH and deionized water. At first, nanoparticles were synthesized by precipitation agent NaOH. But because of the VSM analysis showed that the saturation magnetization of the sample was low, so, the nanoparticles were synthesized with precipitate agent NH 4 OH that it had high saturation magnetization, about 83 % of magnetization of bulk sample, but not superparamagnetic. Consequently, in order to make s superparamagnetic magnetite nanoparticles, pH and temperature of the sample was changed. As a result of this work, nanoparticles with smaller size, superparamagnetic and high saturation magnetization (about 86% of magnetization of bulk sample) was made. In the second section of this study, for the application of nanoparticles in industry, on two of superparamagnetic nanoparticles with different particle sizes, coating the artichokes, with using the APTES interface, was placed.This section also the structural properties of the samples were investigated by using thermal analysis (TG), X-ray diffraction analysis, infrared spectroscopy (FTIR) and field emission scanning electron microscope (FESEM) and then, to study the uptake of heavy metals from industrial contaminated water, the testing was done using ICP-OES. Results show that with the placement of these coatings on the magnetite nanoparticles, the nanoparticle size is reduced and also, nanoparticle agglomerates mode dramatically decreases. In addition, the results of the ICP-OES tests show that, whatever the cover on the CS nanoparticles is higher, the absorption increases and can be used this cover for removing metals such as chromium, manganese and nickel.