Search results for "Zinc."
showing 9 items of 1079 documents
CCDC 1048423: Experimental Crystal Structure Determination
2015
Related Article: Suraj Mondal, Shuvankar Mandal, Luca Carrella, Arpita Jana, Michel Fleck, Andreas Köhn, Eva Rentschler, and Sasankasekhar Mohanta|2015|Inorg.Chem.|54|117|doi:10.1021/ic501900d
Activated Carbon Production from Peat Using ZnCl2 : Characterization and Applications
2017
The process for producing activated carbon from peat was optimized. The peat was impregnated with different ratios of ZnCl2, and the impregnated biomass was activated at different temperatures. The specific surface area, pore size distribution, total carbon content, and yield of the activated carbon were investigated. The best results for the specific surface area and mesoporosity of the activated peat were obtained by using a high impregnation ratio (2) and high activation temperature (1073 K). Highly porous activated carbon was produced that had a specific surface area of approximately 1000 m2/g and total pore volume that was higher than 0.5 cm3/g for most samples. The activated carbon ha…
The complex formation equilibria between Zn(II) and iminodiacetic acid (IDA) in NaClO4 1 M at 25°C
2009
Właściwości strukturalne i aromatyczność ftalocyjaniny cynku
2017
Metaloftalocyjaniny są grupą związków, które otworzyły nowy rozdział w wielu dziedzinach przemysłu i nauki. Dzięki czterem pierścieniom izoindolowym połączonym ze sobą za pomocą mostków azometinowych, powstaje szesnastoatomowy układ sprzężonych wiązań podwójnych składających się na makrocykl, który zawiera 18 zdelokalizowanych elektronów π spełniając regułę aromatyczności Hückla (4 n + 2, n = 4).Pojęcie aromatyczności jest jednym z najpopularniejszych terminów używanych w analizie związków π-elektronowych. Jej definicja jest niejednoznaczna. Cechami układów aromatycznych są podwyższona trwałość, zmiana długości wiązań oraz szczególne właściwości magnetyczne. Możliwe jest jednak odkształceni…
Statistical Approximation of Fourier Transform-IR Spectroscopy Data for Zinc White Pigment from Twentieth-Century Russian Paintings
2017
We present a statistical model for approximation of experimental Fourier transform-IR spectroscopy (FTIR) data for paint samples from paintings of different ages. The model utilizes random variations in some parameters (initial ageing rate, degree of change in ageing rate and time at which the change occurs). We determine the parameters characterizing variation in the paint composition and the storage conditions for the paintings. The numerical calculation is qualitatively consistent with the experimental data. In the proposed model, changes in the initial composition of the paint and the storage conditions make about the same contribution to the experimentally observed scatter in the data …
Experimental investigation on the efficiency of zinc(II) recovery from waste streams by TBP liquid-liquid extraction
2016
In many industrial processes the presence of zinc in the wastewater may represent an obstacle to its high efficient regeneration. This is the case of the treatment of spent pickling solutions aiming the recovery of hydrochloric acid via pyrohydrolysis techniques. Hydrochloric spent pickling solutions from steel processing contain relevant amount of metals such as iron (Fe) and zinc (Zn) that may significantly affect recovery of hydrochloric acid (HCl) through pyrohydrolysis. In fact, although Fe may be recovered as ferric oxide (Fe2O3) and does not have a substantial effect on pyrohydrolysis process, zinc chloride (ZnCl2) evaporating can occlude nozzles and stick to the pyrohydrolysis react…
Recovering of zinc(II) from spent pickling solutions by liquid-liquid extraction
2015
Hydrochloric acid can be successfully recovered from spent pickling liquors with high efficiencies via pyrohydrolysis techniques. In the pickling solution feed, other metallic ions are typically present besides iron (mainly Fe2+) such as zinc(II). In order to avoid undesirable effects, zinc(II) has to be removed, because zinc chloride evaporates and sticks to the reactor walls, as well as it contaminates iron oxides product1. Moreover, zinc recovery is economically affordable because it allows the marketing of some products such as ZnCl2 and ZnSO4. In the present work, liquid-liquid extraction process has been selected to recover zinc(II) from pickling liquors, using suitable extractant age…
Efficient zinc incorporation into hydroxyapatite through crystallization of an amorphous phase could extend the properties of zinc apatites
2013
Creixement cristal·lí mitjançant la tècnica MOCVD i caracterització morfològica i estructural dels òxids de cadmi i zinc
2019
L'òxid de cadmi (CdO) i l'òxid de zinc (ZnO) han estat postulats com dos materials amb gran potencialitat en un ampli ventall d'aplicacions tecnològiques. Pel que fa a les seues propietats físiques, ambdós presenten un caràcter semiconductor de tipus “n”, sense dopatge intencionat. A més, el seu bandgap directe a 2.2 i 3.3 eV, respectivament, asseguren un bon grau de transparència òptica en la regió infraroja i visible de l'espectre electromagnètic. La projecció d'aquests compostos en camps com la plasmònica o les tecnologies basades en transicions intersubbanda fa convenient el control per a l'obtenció de capes molt primes. Malgrat això, gairebé tots els treballs publicats reporten capes p…