The removal of the As(V) and Iprodione fungicide onto EGS@APTES-GT, obtained by amino-modified expanded glass spheres (EGS) modified with goethite, was studied in this work. Material characterization performed using SEM/EDS, XRD, FTIR techniques. adsorption capacities 51.01 94.28 mg g−1, for at 25 °C, respectively, were achieved. A kinetic study indicated lower intraparticle diffusional transport resistance. Physisorption is dominant mechanism removal, while surface complexation As(V)....

An artificial neural network method is applied to the development of an ionospheric forecasting technique for one hour ahead. Comparisons between observed and predicted values critical frequency F2 layer, foF2, total electron content (TEC) are presented show appropriateness proposed technique.

An optimal laboratory two-step procedure was developed for sodium/potassium O-alkyl carbonodithioate (sodium/potassium alkyl xanthates) production in the form of aqueous solutions. Sodium isopropyl xanthate (Na-iPrX), as most effective salt a real ore flotation process, also produced at an industrial level and introduced collector copper ores. In order to reduce toxicity process improve sustainability by minimising environmental impacts, efficiency selectivity were studied relation possible...

A new optimized laboratory synthesis of tetraalkyl thiuram disulfides, starting from dialkyl amines and carbon disulfide in presence three oxidants (hydrogen peroxide, potassium peroxodisulfate sodium hypochlorite) appropriate reaction medium: two mixtures isopropyl alcohol - water used consecutive syntheses, was presented this work. First performed a recycled azeotropic mixture 87.7% 12.3%, second filtrate obtained after first synthesis, which 70.4% 29.6%. After the filtration, 12.3%...

The present study reports the new facile methodology for synthesis of symmetrical and asymmetrical thioureas by an one-pot reaction amine, carbon disulfide oxidants: hydrogen peroxide, ethylenediamine tetraacetic acid (EDTA)/sodium percarbonate system or air. structures synthesized compounds were confirmed IR, 1H 13C NMR MS methods. Reaction mechanism has been proposed on basis intermediate isolation their structure determination. synthetic benefits presented methods is reflected in...

Magnetite (MG) modified cellulose membrane (Cell-MG), obtained by reaction of 3-aminosilane and subsequently with diethylenetriaminepentaacetic acid dianhydride functionalized waste Cell fibers (Cell-NH2 Cell-DTPA, respectively), amino-modified diatomite was used for Azoxystrobin Iprodione removal from water. Cell-MG structurally morphologically characterized using FT-IR FE-SEM techniques. The influences operational parameters, i.e. pH, contact time, temperature, the mass adsorbent on...

In this study, the possibility of using a blend natural waxes (bees and carnauba) for encapsulation some aroma compounds was investigated. Melt dispersion/melt solidification technique applied microbeads production. Since one most important characteristics particles are size shape, particle distribution as well morphological properties tested. Thermal also examined significant thermal behavior at elevated temperatures, application encapsulated in food production processes. Different contents...

In this work we further refine and improve the neural network based ionospheric characteristic's foF2 predictor, which is actually a autoregressive model with additional input signals (NNARX). Our analysis focused on choice of X parts NNARX in order to capture middle long term dependencies. Daily distribution prediction error suggests need for structural changes model, as well adaptation running average lengths used determination inputs. Generalisation properties proposed predictor are...

A new ecologically friendly synthesis of N-alkyl-O-ethylthioncarbamates from ethyl dixanthogenates, waste material the xanthate production plant, and monoalkylamines has been performed in this work. Structure determination synthesized compounds also corresponding intermediates by IR, 1H-NMR MS spectrometric methods. Residual dixanthogenates thioncarbamates water have done gas chromatographic method standard curve. It was confirmed that reaction product not present water, while concentration...

The optimized methods for N-alkyl and N,N-dialkyl substituted thioureas synthesis starting from ammonium thiocyanates, waste water constituent the production of tetramethylthiuram monosulfide (TMTS), alkyl amine, are presented in this work. Therefore, was developed two ways: Method I - reaction thiocyanate alkylamine presence hydrochloric acid; II with benzoyl chloride following by amine addition first step, base hydrolysis second step. structure synthesized compounds confirmed IR, 1H 13C...

A series of N- and N,N-dialkyl-S-alkylthiolcarbamates were synthesized by the rearrangement N,N-dialkyl-O-alkylthioncarbamates in presence diethyl sulfate. The synthesis some compounds without catalyst was also performed. identified IR, 1H NMR MS spectroscopic methods. starting thioncabamates obtained from corresponding xanthogenacetates amines their structures confirmed data. Some thiolcarbamates characterized for first time literature.

In this paper the kinetics of reaction between sodium ethyl xanthogenacetate (NaEtXAc) and six amines was investigated. order to determine wavelength for following reaction, influence structures reactants on absorption (at 280 nm) The values rate constants selected amines, at different temperatures were determined. It confirmed that reactions investigated are second-order. On basis temperatures, several thermodynamic parameters calculated such as energy activation, frequency factor,...

Carotenoids are known for their lower environmental pollution, costs, shorter extraction time compared to regular methods and higher efficiency. Ultrasound has significant advantages in the of a great number biologically active compounds including carotenoids. Benefits using ultrasound various numerous include effective mixing micro-mixing, more efficient energy transfer, reduced thermal concentration gradients, temperature. The aim this work was investigate influence two-frequency main...

The increase in waste polymer recycling has helped promoting sustainability, and together with the use of renewable raw materials, it become a widespread concept positive effects on both economy ecology. Accordingly, aim this study was synthesis “green” plasticizers, marked as LA/PG/PET/EG/LA, formed from poly(ethylene terephthalate) (PET) bio-based platform chemicals propylene glycol (PG) levulinic acid (LA). structure obtained plasticizers complex, confirmed by results nuclear magnetic...

A training set preprocessing procedure is proposed and its influence on neural network performance considered. The has two steps: firstly, data are reclassified by the 1-NN method; secondly, obtained in previous step condensed. theoretical considerations of methods as well some examples networks based original preprocessed sets given.< <ETX xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">&gt;</ETX>