In the present study, reduction of zinc oxide from the pellets made of steelmaking electric arc furnace dust has been investigated. Effects of such parameters as the type of carbon material (graphite, coke and charcoal) as well as time and temperature on the reduction reaction have been examined. The reduced (dimensionless) time method was applied to perform a kinetic analysis of the system. Ex...

Background: Heavy metals in aquatic systems usually interfere with many beneficial uses of water. Divalent nickel is a commonly occurring toxic metal in natural ecosystems due to the effluent of refineries, electroplating, and casting industries. In aquatic environments, nickel appears as Ni (II) and Ni0. Despite the high reported toxicity for Ni (II), Ni0 is only slightly toxic. Various meth...

Mutations, replacing amino acids involved in the formation of hydrogen bonds between subunits of dimeric alkaline phosphatase, have been introduced. Influence of mutations on kinetic properties and structural stability of mutant enzymes was established. In addition, alterations in protein dynamic properties have been studied using room temperature phosphorescence. Kinetic properties of both mut...

Carbon dioxide (CO2) is known as one of the major reasons for global warming. On the other hand, CO2 is considered as an abundant carbon source. Therefore, transformation of CO2 into target chemicals nowadays is of great interest. Recently, a concept of so-called "frustrated Lewis pairs" (FLPs) has been proposed. Such FLPs show unusual reactivity, such as hydrogen activation and the reduction o...

For large and complex reacting systems, computational efficiency becomes a critical issue in process simulation, optimization and model-based control. Mechanism simplification is often a necessity to improve computational speed. We present a novel approach to simplification of reaction networks that formulates the model reduction problem as an optimization problem and solves it using geneti...

This paper describes a simple, kinetic model of the effect of an antibody on the binding of a toxin to its receptor. This model has been used to evaluate the contributions of antibody affinity and concentration to reduction in complex formation and enable prediction of the antibody kinetic constants and concentration required to provide a specified degree of protection. An expression for determ...

Polarographic technique has been used to evaluate the kinetic parameters and formation constants of Co (П) complexes with benzyl penicillin sodium salt at pH 6.0±0.10 and constant ionic strength (μ = 0.1), HCl in aqueous, aqueous-methanol and aqueous-ethanol mixtures at d.m.e. The effect of concentration and temperature on the half wave potential of the complexes has also been investigated. The...

The influence of halide and isothiocyanate ions of the reduction wave of aquopentamminecobalt(‡V) and aquopentamminechromium(‡V) ions at the dropping mercury electrode has been studied by the measurements of current-potential and current-time curves. The cobalt (‡V) complex ion gives a kinetic-controlled reduction wave at more positive potentials than that of the reduction of cobalt(‡V) to coba...

In this work, the efficiency of activated carbon derived from carbonized date pits (ADP) and rice husks (ARH) was compared with commercial activated carbon (CAC) for the reduction of COD in wastewater arising from resin manufacturing plant. The process was studied in batch mode with employing different absorbents optimizing various parameters, such as adsorbent dosage, contact time and pH. Adso...

The characteristics and kinetics of redox transformation of a redox mediator, anthraquinone-2-sulfonate (AQS), during microbial goethite reduction by Shewanella decolorationis S12, a dissimilatory iron reduction bacterium (DIRB), were investigated to provide insights into "redox mediator-iron oxide" interaction in the presence of DIRB. Two pre-incubation reaction systems of the "strain S12- goe...