During the drilling of oil wells, sometimes the digging drill passes through layers with coarse porosity which causes drilling mud loss. Concerning the preciousness of drilling mud, preventing its loss can be economically efficient and lead to a desirable drilling which increases productivity of the oil well. Due to the invaluable of the pores in different ground strata for Hydrocarbon material extraction purposes, a blocker should be used to prevent drilling mud loss. MAGNETITE Cement is used for this purpose.

Iron oxide nanoparticles (nano-Fe) have been widely used in environmental remediation, including that of emerging contaminants, such as antibiotics. MAGNETITE nanoparticles (nano-Fe3O4) have been reported to form on the outer surface of nano-Fe and have the potential to be a good sorbent for certain antibiotics. This study reports, for the first time, the kinetics and thermodynamics of adsorption of a common tetracycline group antibiotic, oxytetracycline (OTC), on nano-Fe3O4. Batch sorption kinetics were evaluated by varying initial OTC concentration (0.25-2 mM), nano-Fe3O4 concentration (2.5-20 g L-1), pH (3.8-7.6), temperature (5, 15, 35 oC), and ionic strength (0.01-0.5 M KCl) to derive thermodynamic and kinetic constants. Results show that OTC sorption kinetics is rapid and increases with increasing temperature. The derived thermodynamic constants suggest a surface chemical-controlled reaction that proceeds via an associative mechanism. Results indicate the potential of developing a nano-MAGNETITE-based remediation system for tetracycline group of antibiotics.

Both Sangan and Tannurjeh MAGNETITE deposits are Iron-oxides type. Geochemistry and petrography of source rocks at Tannurjeh and Sangan were studied in detail. The source rocks at Sangan are compused of quartz hornblende alkali syenite porphyry and quartz biotite-hornblende alkali syenite porphyry; while The source rocks at Tannurjeh varies between hornblende quartz diorite porphyry and hornblende granodiorite porphyry. The Au content of Sangan deposit is up to 32 ppb, while Tannurjeh contains up to 700 ppb Au. Based on major oxides analyses, the source rocks at Sangan is ultra-potassic (K2O is 8.5 to 13%), but in Tannurjeh the K2O is lower than 3.5%. The MgO, TFeO, and CaO content of Tannurjeh source rocks is higher, therefore the rocks are slightly mafic in comparison with Sangan source rocks. The content of HFSE elements such as Cu, Ni, Co, Cr, V are higher in Sangan source rocks and the LILE elements such as Th, Zr, Ba, Rb are higher in Tannurjeh source rocks. The La and Ce content of Tannurjeh is higher. At Tannurjeh the Sr and Zn content is higher while at Sangan Nb and Y is higher. The source rocks for IOCG deposits in Chile, coastal belt of Peru, and kirona areain Sweden are high to medium K-content, and alkaline to calc-alkaline diorite-monzonite-granodiorite; there fore the source rocks at tannurjeh have very ligh similarity in composition to these rocks.

Nowadays nanotechnology as a new direction of science allows us to develop therapeutic methods of the endogenous intoxication syndrome and to create a new class of biocompatible sorbents. In Ukraine first preparations of medical nanotechnology were produced and patented in 1998. These are IKBB (intracorporeal biocorrector), magnet-controlled sorbent (MCS-B), and Micromage-B. The preparations are based on colloid MAGNETITE particles (Fe3O4) from 6 to 12 nm. Adsorption layer provides a high sorption activity to MAGNETITE nanoparticles. Total activity of their sorption surface is 800-1200 m2/g, magnetic field intensity produced by each particle is 300-400 kA/m, V-potential is- 19 mV. Each MAGNETITE particle is a subdomain elementary MAGNETITE of a sphere shape. The main biological action of nanotechnology preparations is directed towards regulation of cell metabolism. Therapeutic effect of this preparation is based on the influence of adsorption process and of constant magnetic field that surrounds colloid MAGNETITE particle on cellular and subcellular structures. Point of attack is surface proteins of cell membranes. Colloid MAGNETITE particles modify composition of protein molecules thereby affecting the transport of substances to a cell. Using magnet-controlled sorbent the method of extracorporal hemocorrection on the whole is more effective and reliable way to activate natural processes of detoxication of organism, than that of artificial detoxication. The absence of contra-indication and incidental effects (haematic, haemodynamic, hormone, electrolytic, immune) creates real predisposition for using this method in intensive therapy of intoxication syndrome.

In this paper, graphene oxide was synthesized using the Hummer’ s method. Then, an efficient method for the synthesis of Reduced Graphene Oxide/MAGNETITE (RGO/Fe3O4) nanocomposite is presented. The properties of RGO/Fe3O4 nanocomposite were investigated using FT-IR, XRD, VSM and SEM. The SEM images show that MAGNETITE nanoparticles were appropriately placed on graphene sheet. Distribution of Fe3O4 nanoparticles on the graphene sheets was properly established. The average size of 22 ± 5 nm for Fe3O4 nanoparticles, which have been put on graphene substrates, was measured using SEM images. The VSM results demonstrate that there is no apparent change in the properties of MAGNETITE nanoparticles in RGO/Fe3O4 nanocomposite. Therefore, this nanocomposite could be appropriate for magnetic applications. A cyclic voltammetric analysis was performed to investigate the electron transfer kinetics in nanocomposite. Distribution of Fe3O4 NPs on the graphene layers increased the efficiency and sensitivity of the electrochemical sensor, causing the RGO/Fe3O4 nanocomposite to have considerably higher electrochemical catalytic properties. A modified GCE was also fabricated based on RGO/Fe3O4 nanocomposite to investigate the electrocatalytic oxidation of K3[Fe(CN)6] using cyclic voltammetry detection. In cyclic voltammetry studies, oxidation current enhancement was observed when MAGNETITE nanoparticles loaded on graphene substrates, which could make RGO/Fe3O4 nanocomposite as an efficient electrochemical sensor.