Ethylenediaminetetraacetic acid disodium salt (Na2EDTA) was employed to in-situ modify activated carbon from Typha orientalis during phosphoric acid activation to improve its Ni(II) adsorption capacity. The Ni(II) adsorption capacities of original activated carbon (AC) and Na2EDTA-modified activ...

A modelling of a continuous fluidized-bed crystallizer is developed. The model is based on the description of the fluidized bed as a multistage crystallizer, in order to take into account the segregation and particles mixing within the bed. This model is compared to experimental data obtained du...

The presence of impurities in a system can drastically affect the growth rates of crystals grown from solutions. In this study, growth experiments with tetrahydrate sodium perborate (SPB) crystals in the presence of additives have been performed in a batch fluidized bed crystallizer. First, it h...

Dehydration kinetics of sodium perborate tetrahydrate to monohydrate is investigated at four different temperatures between 314.7 and 331 K in a controlled fluidized-bed drier. During the dehydration, no thermal decomposition of sodium perborate to sodium metaborate is observed. First-order kine...

Growth and dissolution rates of sodium perborate crystals have been measured in a flow-type single-crystal cell. Sodium perborate grows dendritically at any level of supersaturation and shows growth and dissolution rate dispersion. Both the growth and dissolution rates of sodium perborate were f...

Effects of SiO2 additive on sodium perborate tetrahydrate crystallization (via chemical reaction of NaBO2 and H2O2) has been studied in a MSMPR-type reaction crystallizer. CSD and microscopic observations are used to evaluate the secondary nucleation behaviour. Secondary nucleation rate decrease...

The synthesis of optically pure compounds in a safe and efficient manner is an increasingly important area of organic chemistry. Enantioselectivity in the oxidation of substituted chalcones is induced by the use of a polyamino acid catalyst. By employing sodium perborate tetrahydrate as an oxidi...

Semi-batch reactive precipitation of sodium perborate tetrahydrate was studied in a stirred reactor. Effect of hydrodynamic parameters and reactant concentrations on the average crystal size was examined and it was found that secondary nucleation plays a dominant role in deciding the final cryst...

The crystallization of sodium perborate tetrahydrate (SPT) was carried out in a batch crystallizer with and without seeding. SPT concentration and CSD were monitored as functions of time, and the final crystals visualized by SEM micrography. Experimental evidence for primary and secondary nuclea...

Cobalt(III) 5,10,15-tris(4-tert-butylphenyl) corrole with a triphenylphosphine axial ligand and rhodium(III) 5,10,15,20-tetra(p-tert-butylphenyl) porphyrin are incorporated into plasticized poly(vinyl chloride) films to fabricate nitrite-selective bulk optodes via absorbance measurements. The re...

A series of the half-sandwich Ir(III) and Rh(III) complexes [M(η5-Cpx)(dpa)X]PF6 (M = Ir for 1–6 and Rh for 7–12) containing N-(pyridin-2-yl)pyridin-2-amine (2,2′-dipyridylamine, dpa), pentamethylcyclopentadienyl (Cp*; for 1–5 and 7–11) or 1,2,3,4-tetramethyl-5-phenylcyclopentadienyl (Cpph...

The demand for bromide determination has increased over recent years. Sources of bromide contamination can be found in brines from hydraulic fracturing, pesticides and brominated polymers. Widely used in different applications, the bromide anion is present in the composition of several compounds...

Liquid–liquid extraction/separation of platinum(IV) and rhodium(III) from acidic chloride solutions was carried out using tri-iso-octylamine (Alamine 308) as an extractant diluted in kerosene. The percentage extraction of platinum(IV) and rhodium(III) increased with increase in acid concentrati...

Iron oxide and ceria are known to have redox properties and their performance as a water–gas shift (WGS) catalyst is investigated at low H2O/CO ratio (∼2) in the temperature range of 623–773 K at 21 bar with space velocities relevant for industrial applications. The WGS activity of supported ...

The recovery of metals from waste is profitable not only from an economic but also from an ecological point of view. The natural resources of metals (especially platinum group metals – PGM) are limited, while the amount of waste containing the desired metals is still growing. The purpose of the...

Ni100-xRhx/C composites consisting in bimetallic nanoparticles (10 wt.%) dispersed in high surface area graphite were synthesized and their electrocatalytic performances for urea oxidation tested in alkaline media by cyclic voltammetry using a cavity microelectrode. The composites are synthesize...

The rhodium particles can be electrodeposited on a glassy carbon electrode, previously modified with multi-walled carbon nanotubes (MWCNTs), by voltage cycling between 0.4 V and–0.3 V vs. SCE (30 cycles) in 50 mM H2SO4 containing 4.0 mM RhCl3. This proposed modified electrode is useful to facil...

Extraction of palladium(II) from hydrochloric acid media with novel piperidine-based extractants N-decylpiperidine (P-C10), N-dodecylpiperidine (P-C12), N-tetradecylpiperidine (P-C14) and N-hexadecylpiperidine (P-C16) has been investigated. Over 90% of palladium(II) from 0.1 M HCl solution can b...

A novel rhodium [Rh(NO3)5]2− anionic complex with mixed denticity of nitrato ligands was isolated in a form of its poorly soluble caesium salt. The structure of the salt was studied by an X-ray single crystal method. DFT-based theoretical studies were carried out to gain insights into the electr...

A screening of various cerium salts for promoting the Paal–Knorr pyrrole synthesis revealed the superiority of cerium (IV) ammonium nitrate (CAN) as a catalyst. Excellent yields of substituted pyrroles were obtained in CAN-catalyzed Paal–Knorr reactions of 1,4-diketones with various amines. Th...