Ferrites have been used to separate a wide range of substances such as dissolved metal species, particulate matter, and organic and biological materials; they have been used almost exclusively for metal waste treatment applications. However, ferrites can be used to remove and concentrate selected trace metals in a wide variety of feed solutions requiring analysis. A brief overview of ferrite properties and recent applications for trace metal recovery and concentration will be presented.
The thermal decompositions of dehydrated or anhydrous bivalent transition metal (Mn, Fe, Co, Ni, Cu, Zn, Cd) and alkali rare
metal (Mg, Ca, Sr, Ba) methanesulfonates were studied by TG/DTG, IR and XRD techniques in dynamic Air at 250–850 °C. The initial
decomposition temperatures were calculated from TG curves for each compound, which show the onsets of mass loss of methanesulfonates
were above 400 °C. For transition metal methanesulfonates, the pyrolysis products at 850 °C were metal oxides. For alkali
rare metal methanesulfonates, the pyrolysis products at 850 °C of Sr and Ba methanesulfonates were sulphates, while those
of Mg and Ca methanesulfonate were mixtures of sulphate and oxide.
Authors:Nahid Nishat, Sumaiya Hasnain, Tansir Ahmad, and Asma Parveen
In the recent years, the synthesis of new polymers with unusual thermal, optical, and mechanical properties has gradually gained regards. The branch of the polymer–metal complexes has been developed as an
Authors:Chun-Hong Jiang, Li-Fang Song, Cheng-Li Jiao, Jian Zhang, Li-Xian Sun, Fen Xu, Yong Du, and Zhong Cao
polycarboxylates as linkers. This new emerging class of hybrid materials called metal–organic frameworks (MOF) may potentially find many applications in the field of gas storage [ 1 – 6 ], separation [ 7 – 10 ], catalysis [ 11 , 12 ], and luminescence [ 13 – 16
Authors:V. Šutinská, M. Pajtášová, D. Ondrušová, S. Ľalíková, A. Ferjancová, J. Paliesková, and S. C. Mojumdar
(propylene oxide (PO), ethylene oxide) with polyfunctional starter compounds. In the conventional production process, this reaction is catalyzed by strong bases (KOH). The coordinative polymerization of epoxides with double metal cyano (DMC) complex catalysts
Authors:Shakeel Ahmed, Faizur Rahman, Adnan M. J. Al-Amer, Eid M. Al-Mutairi, Uwais Baduruthamal, and Khurshid Alam
catalysts for propane OXDH [ 12 ]. Therefore, the isomorphous substitution of active metal species, e.g., vanadium, into microporous and mesoporous materials is an attractive strategy for designing new catalysts for this reaction [ 13 – 15 ].
Authors:Marcela Stoia, Mirela Barbu, Mircea Ştefănescu, Paul Barvinschi, and Lucian Barbu-Tudoran
The synthesis of metal chromites with spinel structures is a subject that acquired keen researcher interest from early times because of their technological applications [ 1 ]. In the last decade, the synthesis of