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Hybrid Manganese Spinel Ferrite Nanostructures: Synthesis, Functionalization and Biomedical Applications
Published in Surender Kumar Sharma, Nanohybrids in Environmental & Biomedical Applications, 2019
S. Del Sol Fernández, Oscar F. Odio, E. Ramón-Gallegos, Edilso Reguera
The general strategy consists in the mixing of ferric and divalent metal precursor ions in a basic solution under an inert atmosphere at room temperature or at elevated temperature (Kafshgari et al., 2018, Akhtar and Younas, 2012, AlTurki, 2018). Based on this method, Zipare et al. (2015) reported an economical and efficient large-scale synthesis of superparamagnetic MnFe2O4 NPs with controlled size and high saturation magnetization. Coprecipitation is highly dependent on the reaction parameters (e.g. iron precursor, molar ratio of Fe3+ and M2+, reaction temperature, solution pH and reaction medium), which enables the tuning of the size, shape, composition and magnetic properties of the products. For example, Pereira et al. (2012) used alkanolamines acting as both alkaline agents and complexing ligands that controlled the particle size (4–12 nm) and improved the spin rearrangement at the surface, while Iranmanesh et al. (2017) found that increasing the solution pH results in smaller particles.
Synthesis of Ceramic Superconductors
Published in A. G. Mamalis, D. E. Manolakos, A. Szalay, G. Pantazopoulos, Processing of High-Temperature Superconductors at High Strain Rates, 2019
A. G. Mamalis, D. E. Manolakos, A. Szalay, G. Pantazopoulos
Coprecipitation is the physicochemical process that deals with the separation of a solid containing various ions from a solution. A homogeneous co-precipitation usually results in the formation of nanometer-scale precipitates of quasi-crystalline or even amorphous form. Coprecipitation of species, possessing strictly defined chemical composition and stoichiometry, can be achieved under the following conditions: The precipitating agent is a multivalent organic compound that can coordinate more than one metal ion, whereas the precipitation rate is rapid.Careful adjustment of the pH in the solution must be made.The solid precipitating out of the solution must be insoluble in matrix liquid.
Precipitation and Crystallization Processes in Reprocessing, Plutonium Separation, Purification, and Finishing, Chemical Recovery, and Waste Treatment
Published in Reid A. Peterson, Engineering Separations Unit Operations for Nuclear Processing, 2019
Calvin H. Delegard, Reid A. Peterson
The concentration of the material of interest in solution, such as plutonium present in dissolved irradiated uranium fuel, may be too low to be precipitated of itself. In this case, coprecipitation might be (and has been) used. The IUPAC (2014) defines coprecipitation as “the simultaneous precipitation of a normally soluble component with a macro-component from the same solution by the formation of mixed crystals, by adsorption, occlusion or mechanical entrapment.” The macro-component is often called a carrier, and the coprecipitation called carrier precipitation. The IUPAC (2014) defines a carrier as “a substance in appreciable amount which, when associated with a trace of a specified substance, will carry the trace with it through a chemical or physical process.”
Manganese ferrite nanoparticle production from industrial wastes as sorbent material for arsenic removal from aqueous solutions
Published in Particulate Science and Technology, 2020
Ünzile Yenial, Gülay Bulut, Francesca Pagnanelli
The coprecipitation method, which is a simple method to produce spinel nanoparticles, is also advantageous for the purification of metal-bearing waste solutions. Therefore, in this work, the production of manganese ferrite nanoparticles from industrial wastes was studied with the coprecipitation method using an Mn-bearing solution (from processed lithium-ion batteries) (Pagnanelli et al. 2016) and an Fe-bearing solution (pyrite ash from a sulfuric acid production plant). For this aim, different parameters were tested in order to synthesize small, magnetic, and stable nanoparticles. The best product was used as an adsorbent material to remove arsenic from synthetic solutions; parameters such as pH, contact time, and initial concentrations were investigated.
Heterogeneous Catalytic Ozonation for Water Treatment: Preparation and Application of Catalyst
Published in Ozone: Science & Engineering, 2023
Zekun Yang, Haitao Yang, Yong Liu, Chaoquan Hu, Hailong Jing, Hongtao Li
The coprecipitation approach is commonly utilized in the manufacture of solid catalysts. Usually, the precipitate was made by mixing a precipitator with a salt solution, and then, washing, drying, and calcining it under various circumstances. Meanwhile, coprecipitation produces composites using a larger range of cations, including silicon, cobalt, manganese, copper, nickel, and aluminum (Hassani et al. 2019). The kind and concentration of precipitator, precipitation temperature, precipitation pH, stirring speed, and feeding order all affect the characteristics of precipitates in the precipitation process. As a result, operational conditions are critical and should be optimized.