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Borate Phosphor for Phototherapy Application
Published in S. K. Omanwar, R. P. Sonekar, N. S. Bajaj, Borate Phosphors, 2022
Praseodymium (Pr) is an element having atomic number 59. It is the third element of the lanthanide series and is usually considered to be one of the rare earth metals. Praseodymium is a soft, silvery, malleable and ductile metal possesses magnetic, electrical, chemical and optical properties. It is too reactive to be found in native form, and pure praseodymium metal slowly develops a green oxide coating. It occurs along with other lanthanide elements in a variety of minerals. The two primary sources are monazite and bastnaesite. It is extracted from these minerals by ion exchange and solvent extraction.
Solvent Extraction, Sequential Separation and Trace Determination of La (III), Ce (III), Nd (III) and Gd (III) with 2, 14-bis[m-nitrophenyl]-Calix[4]Resorcinarene-8, 20-bis[N- phenylbenzo]-dihydroxamic Acid
Published in Solvent Extraction and Ion Exchange, 2023
C. R. Sharma, R. N. Patadia, Y. K. Agrawal
Neodymium is one of the rare earth elements, and is primarily obtained from the minerals monazite and bastnasite. It can be separated from other rare earths using ion-exchange or solvent extraction techniques,[5,6] and can be reduced from anhydrous halides such as NdF3 with calcium metal. It has a wide range of applications, including in ceramics for coloring glazes, alloys for permanent magnets, and special lenses in combination with praseodymium.[7] Neodymium also produces bright purple glass and special glass that filters infrared radiation. It is also used in didymium, a mixture of neodymium and praseodymium,[8] for coloring glass in welders goggles. Additionally, glass containing Neodymium can be used as a laser material to produce coherent light, and neodymium salts are used as a colorant for enamels.
Removal of 142Pr from nuclear purity water using hydroxyapatite
Published in Journal of Environmental Science and Health, Part A, 2022
M. Solache-Ríos, M. Jiménez-Reyes, P. T. Almazán-Sánchez
The scope of the studies about the REE (rare-earth elements) is broad, from the interest on their chemical behavior, their presence in the 235U fission products, up to their multiple applications.[1,2] More recently, interest is focused on the wastes that may be generated by these applications and on the treatment of such wastes. Praseodymium ([Xe] 6 s2 4f3), as a member of the rare earth group, is found in a trivalent state in both solid compounds and solution and the only natural isotope is 141Pr.[3] Applications of praseodymium include: its presence in mish metal (5% Pr); magnesium alloy of high strength for aircraft engines; the use of some of its compounds as dyes for glass and enamels,[4] magnets, batteries, and automobile catalyst.[5] Recently, 142Pr (produced by the (n, γ) reaction of 141Pr) has been proposed as a therapeutic radionuclide, for both external imaging and internal radiation.[6,7] Therefore, the presence of praseodymium in the environment as industrial or radioactive waste is probable. Regarding the hydrolysis behavior of praseodymium, the first hydrolysis constant, the solubility product and so the pH borderline of precipitation depend on the aqueous medium conditions, for example, the presence of CO2 and chloride ions.[8,9] A recent review article about adsorption of REE[10] included some studies on praseodymium using biosorbents, such as seaweeds,[11] crab shell, and orange peel,[12] as well as using magnetic nanoparticles functionalized with phosphonic groups.[13] It seems that praseodymium is one of the least explored REE in adsorption studies.