The preparation of nanostructure type MANGANESE OXIDE and cobalt OXIDE materials with the smallest particle size is reported here. The nanorod MANGANESE OXIDE and cobalt OXIDE nanotube were prepared via a sol-gel reaction in reverse micelles from KMnO4 and CoCl2 with respectively source at room-temperature. The structure and surface morphology of the obtained MANGANESE OXIDE were studied by means of X-ray diffraction analysis (XRD), scanning electron microscopy (SEM) and transmission electron microscopy.

AbstractIntroduction: MANGANESE OXIDE nanoparticles are used as strategic materials in various industries such as battery manufacturing, water and wastewater treatment, pharmaceutical industries, etc. because of economic reasons and have special physical and chemical properties. The production of MANGANESE OXIDE nanoparticles is one of the secondary metabolites in bacteria. Considering that the MANGANESE and narcissus mine in Qom province is one of the most important sources of MANGANESE for MANGANESE-oxidizing microorganisms, this project was done for the first time on mine soli.Materials and Methods: In this study, 100 soil samples were collected from different areas of the MANGANESE mine and inoculated in the selective enrichment medium K and heated on a rotary shaker. The strains obtained from the culture in a MANGANESE-containing medium were evaluated by the benzidine test to evaluate the oxidation ability of MANGANESE and properties of MANGANESE OXIDE nanoparticles including morphology, size, and chemical structure using confirmation techniques such as UV-VIS, FTIR, XRD, FESEM, TEM. Using the FESEM histogram, the size of nanoparticles in the range of 10 nm was determined and the selected strain was molecularly identified.Results: For the first time, native actinobacteria strain with the ability to oxidize MANGANESE and nanoparticle production extracellularly was isolated from the Venarj MANGANESE mine soil of Qom and was biochemically and molecularly identified. The strain was registered in the NCBI with the name Streptomyces xantholiticus HA98 and identification code OM669940.Discussion and Conclusion: Based on the importance of MANGANESE OXIDE nanoparticles in medical, industrial, and pharmaceutical industries and that the Venarj MANGANESE mine soil of Qom is an important source for MANGANESE-oxidizing microorganisms, the present study was conducted for the first time in Iran on this mine soil so that the microorganism with the above properties could be identified and used in various industries

Discharge of untreated industrial wastewater containing heavy metals such as Pb2+ is hazardous to the environment due to their high toxicity. This study reports on the adsorption, desorption, and kinetic study on Pb2+ removal from aqueous solutions using wood/Nano-MANGANESE OXIDE composite (WB-NMO). The optimum pH, contact time and temperature for adsorption were found to be 5. 0, 4 h and 333 K, respectively. Pseudo-second-order kinetics best described the adsorption process with an initial sorption rate of 4. 0 mg g min-1, and a half-adsorption time t1/2 of 31. 6 min. Best fit for adsorption isotherm was obtained with the Brunauer-Emmett-Teller (BET) model with a maximum adsorption capacity of 213 mg/g for an initial metal concentration of 60 mg/L. Both intra-particle diffusion and film diffusion contribute to the rate-determining step. Desorption experiments with 0. 5 mol/L HCl, inferred the reusability of the composite. Adsorption experiment of Pb2+ from industrial wastewater confirmed that the prepared WB-NMO is a promising candidate for wastewater treatment. The WB-NMO demonstrated high Pb2+ removal efficiency and is considered as a promising alternative and reusable composite for lead removal from contaminated effluents.

In this research, zinc OXIDE-MANGANESE OXIDE nanocomposite adsorbent based on active alumina was synthesized by heterogeneous precipitation method of urea homogeneous hydrolysis that is an applied and economical method. The effect of calcination temperature on morphology, formation of phase, type of formed bonds and the crystallite size of nano-composite were tested by X-ray diffraction (XRD), field emission scanning electron microscope (FESEM), analysis of gravimetric thermal (TGA) and fourier transform infrared (FT-IR). The effect of different weight ratios of zinc OXIDE and MANGANESE OXIDE (alumina with constant wt%) on surface area, surface charge of nanocomposites and eventually adsorption of methyl orange anionic dye were investigated. The results indicated that the sample contains 35 wt. % of zinc OXIDE calcined at 400 ° C, showed 96 % adsorption efficiency (within twenty minutes) for the methyl orange anionic dye. These can be attributed to the high surface area (88 m2/gr) and also active sites of the nanocomposite. Microscopic observations showed formation of nanoflakes on surfaces of active alumina particle. J. Color Sci. Tech. 11(2018), 245-255© . Institute for Color Science and Technology.

More than 22% of the world's agricultural land is saline, and this trend continues to increase with climate changes. Salinity stress causes leaf color change, osmotic stress, ionic toxicity, prevents growth, photosynthesis and plant performance. Due to their size less than micron, metal nanoparticles have a great absorption and transmission power in plants. Salinity stress is a major problem in hot and dry areas under tomato cultivation. For this purpose, investigating the mutual effects of the size and type of zinc OXIDE and iron OXIDE nanoparticles on the improvement and change of growth and increasing the resistance to salt stress in tomato plants of the early urbana variety were carried out in the form of a completely randomized and factorial design with 4 replications, at a significant level of 5%. In this research, zinc OXIDE nanoparticles in 25 and 50 nm sizes, iron OXIDE in 25 nm sizes and sodium chloride in 0 and 75 mM levels were used. Nanoparticles and salinity treatments were both applied to the plants. The results showed that salt stress led to a decrease in plant growth parameters such as shoot and root length, leaf area, RWC, ion leakage. Also, NaCl led to an increase in the accumulation of prolin and other aldehydes, sodium, iron and zinc. The application of nanoparticles had a slight effect in stress-free conditions, but in stressed conditions, these two nanoparticles alone and especially in combination neutralized the effect of salinity and reduced the damage caused by salinity stress.

The adsorption of Fe2+ by the MANGANESE OXIDE coated zeolite (MOCZ) and iron OXIDE coated zeolite (FOCZ) was studied. Surface properties of adsorbents have been investigated for monitoring their changes and morphology for both of the MOCZ and FOCZ. Main variables namely; contact time, pH, initial concentration of Fe2+, size and dosage of adsorbent have been optimized, and the results contrasted with isotherm and kinetic models for finding best fit. The best fit of the adsorption isotherms was obtained using the Langmuir model (R2=0. 96 and 0. 92) using MOCZ and FOCZ. The rates of adsorption were found to conform to the pseudo-second-order kinetic with a good correlation (R2=0. 98 and 0. 82 for MOCZ and FOCZ, respectively). The results indicated that MOCZ has good ability (80% removal of Fe2+) for the removal of Fe from water. The MOCZ exhibited the porous structure with high surface area rather than FOCZ, and the percentage removal of Fe2+ by MOCZ was better than FOCZ.