The active development of water purification functional materials based on multicomponent spinel ferrites makes it necessary to search for new efficient methods of obtaining initial nanostructured powders. In this study, a two-stage method for the synthesis of perspective pollutant absorption agents based on NixZn1−xFe2O4 (x = 0, 0.3, 0.7, 1.0) spinel ferrites are proposed and implemented. The approach is based on the synthesis of the initial powder using the solution combustion method and its subsequent thermal treatment in the air. It was found that synthesized samples are single-phase Ni-Zn ferrites with an average crystallite size of 41.4 to 35.7 nm and a degree of crystallinity of ~95–96%. The analysis of antimicrobial activity against four diverse test-cultures: Escherichia coli ATCC 11229 (non-spore-forming gram-negative), Bacillus cereus ATCC 10702 (spore-forming gram-positive), Staphylococcus citreus NCTC 9379 (non-spore-forming gram-positive), and Candida tropicalis ATCC 750 (yeast) showed that almost all of the synthesized powders exhibit an advanced ability to inhibit the growth of the microorganisms mentioned above. The compositions obtained can be a perspective basis for both natural and wastewater purificators with magnetic separation ability and can find biotechnological and biomedical applications as promising antimicrobial materials.
This article provides information about the bactericidal performances of lithium ferrites nanopowders obtained via heat-treatment of amorphous products of solution combustion approach. XRD, EDX, SEM, and VSM were used to investigate morphology features, structural and magnetic parameters. The inhibition zone test with Escherichia coli, Bacillus cereus, and Staphylococcus citreus as the bacterial source was used to investigate the antibacterial performances. It was found that pure single-phase Li and LiZnMn ferrites with an average size of particles − 35 and 44 nm, respectively, are formed under the SCS-assisted method. The investigation of magnetic behavior indicates the magnetically soft nature of the obtained powders with moderate coercivity force (Hc) values equal to 116.1 Oe for Li-ferrite and 54.3 Oe for LiZnMn-ferrite. When studying the antibacterial activity, the inhibition zones were measured as 16-17 mm for E. coli, 15-25 mm in the case of B. cereus, and 13-16 mm for S. citreus, and the findings is the synthesized compositions are suitable for use in the agricultural sector.
The article provides information about sorption properties of crab chitosan in relation to Analgin, Aspirin, Quamatel, Mydocalm, Paracetamol, Tsifran and Phtalazol. Quantitative determination of medicines’ amount before and after sorption was performed by HPLC-MS method with the preliminary plotting of calibration curves. The sorption capacity of chitosan taken in different concentrations was determined. Sorption isotherms and kinetic curves of medications’ sorption by chitosan were plotted. It has been shown that the maximum degree of sorption in static conditions for all studied medicines was achieved within an hour after the beginning of the sorption process.
The article provides information about the way of obtaining chitin-chitosan biosorbents from the fungus Rhizopus oryzae, using mild deacetylation and demineralization conditions. Such physicochemical properties as deacetylation degree, total ash, weight loss on drying etc. were determined. Method of obtaining the chitin-chitosan complex, shown in the current study, allows to obtain a pure biosorbent with a high degree of deacetylation possible to be further used as entero-and hemosorbent.
The composition of the microbial community isolated from the surface of samples of structural materials located in the area of the Kislogubskaya tidal power plant in the Barents Sea was determined. Groups of potentially corrosion-active microorganisms were identified using selective culture media. The Pseudomonas fluorescens strain, belonging to the group of iron-oxidizing bacteria, characterized by a chemoorganotrophic type of nutrition was isolated. The morphological, physiological, biochemical and cultural characteristics of the strain and the analysis of the 16S rRNA gene sequences were determined.
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