Marina. Dmitrievna. Vedenyapina

• институт органической химии им. Зелинского РАН

Electrochemical reduction of cyclic diacyl peroxide (2,3-dioxaspiro[4.4]nonane-1,4-dione or spirocyclopentylmalonyl peroxide) was explored using a smooth platinum anode/smooth gold cathode pair in an aqueous medium. This peroxide during the electrolysis was selectively reduced to cyclopentane-1,1-dicarboxylic acid in 85% yield, while any decarboxyl...

The literature sources containing information and description of the experiment on the regeneration of activated carbons containing biologically active organic compounds on the surface, as well as the necessary characteristics for evaluating the effectiveness of regeneration are considered. It is shown that each regeneration method has its positive...

Adsorption of herbicide, 2,4-dichlorophenoxyacetic acid (2,4-D), on active carbon samples based on cedar nut shell (CN) was studied. The textural characteristics of CN, adsorption capacity, and kinetics of 2,4-D adsorption from an aqueous medium were studied. The activation of CN in a water vapor was shown to result in the formation of a developed...

The electrochemical behavior of a flat gold electrode in an acetonitrile solution of 3-(1,4-dimethyl-2,3,5,6-tetraoxabicyclo[2.2.1]hept-7-yl)propanoic acid was studied by cyclic voltammetry. The formation of colloidal gold particles was detected during the anodic oxidation. The kinetics of their formation was studied by the gravimetric method. Pero...

Kinetics and mechanism of anodic oxidation of an Au electrode in a weakly basic aqueous solution of secondary diaminoalkanes (N1,N2-dimethylethane-1,2-diamine and piperazine) were studied by cyclic voltammetry and gravimetry. It was found using scanning and transmission electron microscopy that the oxidation products of the Au anode under galvanost...

The behavior of a smooth gold electrode in aqueous solutions of the potassium salt of bridging 1,2,4,5-tetraoxane containing a biperoxide cyclic fragment was studied by cyclic voltammetry. The cathode process was analyzed in detail. It was shown that the process involves four electrons. The products of electrolysis of the potassium salt were studie...

The adsorption of salicylic acid on active carbon samples containing iron compounds that endow the carbons with magnetic properties was studied. These properties markedly facilitate the phase separation process after adsorption. Although the adsorption capacity of iron-modified samples somewhat decreased, they still had sufficient adsorption capaci...

The influence of activation methods on the surface characteristics of activated carbons (ACs) and the relationships of these characteristics and the parameters of a medium with the efficiency of adsorption of herbicide molecules on ACs are considered. The main factors affecting the adsorption efficiency of ACs with respect to these pollutants are d...

The electrochemical corrosion of a gold anode in a weakly basic aqueous solution of triethylenetetramine was studied. Scanning and transmission electron microscopy revealed the formation of a compact gold deposit on the cathode and gold nanoparticles in the electrolyte. The kinetics and mechanism of the corrosion of the gold anode were studied by g...

Electrochemical corrosion of a gold anode in a weakly basic aqueous solution of hexamethylenetetramine (urotropine) was studied in the galvanostatic mode at various currents. The formation of a compact gold deposit as dendrites on the cathode and colloidal gold nanoparticles in the electrolyte was detected by scanning and transmission electron micr...

The review considers the methods of preparation and the main surface characteristics of magnetic carbon-containing sorbents (MCSs) and summarizes data on the use of MCSs of various origins for the extraction of pharmaceuticals, heavy metals, and dyes from aqueous media. The main factors influencing the adsorption efficiency of MCSs in relation to t...

The kinetics and mechanism of corrosion of gold anode in a weakly basic aqueous solution of N,N-dimethylpropane-1,3-diamine have been studied by cyclic voltammetry and gravimetry. According to the scanning and transmission electron microscopy data, the corrosion products of gold anode are reduced at both steel and platinum cathodes under galvanosta...

The kinetics and mechanism of corrosion of an Au anode in a weakly basic aqueous solution of 2,2-dimethyl-1,3-diaminopropane (2,2-DM-1,3-DAP) were studied by gravimetry and cyclic voltammetry. Scanning and transmission electron microscopy was used to determine that under galvanostatic conditions the products of anode corrosion are reduced on a stee...

Recent developments in the use of activated carbons (ACs) of various geneses for wastewater treatment to remove copper, nickel, cadmium, and lead ions, which most frequently occur in industrial and municipal wastewaters, are summarized.

The adsorption of 2,4-dichlorophenoxyacetic acid (2,4-D) from aqueous solutions on different porous materials was studied. The materials included micro- and mesoporous carbon matrices of different genesis and metal-organic frameworks (MOFs) of the MIL type such as microporous matrices MIL-53(Al) (AlOHbdc, bdc = benzene-1,4-dicarboxylate) and NH2-MI...

The kinetics and mechanism of corrosion of Au anode in a weakly basic aqueous solution of 1,2-diaminopropane were studied by gravimetry. According to transmission electron microscopy data, the products of anode corrosion under galvanostatic conditions are reduced on the steel cathode to give not only the electrolytic Au deposit on the cathode, but...

The corrosion of the Au anode in aqueous solution of 1,4-diaminobutane (DAB) was studied by gravimetric analysis. The corrosion products were found to reduce at a steel cathode under galvanostatic conditions to form electrolytic precipitate of Au. Complex of Au with DAB was found to form in the solution, the structure of the complex was suggested....

This review summarizes the latest developments on the use of activated carbon adsorbents of various geneses for the adsorption of the most common pharmaceuticals in wastewater.

The electrochemical behavior of ascorbic acid (AA) is studied by means of cyclic voltammetry (CVA) and square-wave voltammetry (SWVA) on a boron doped diamond electrode (BDD). The possibility of using the voltammetric response signal to determine quantitatively the concentration of AA in an aqueous solution is shown. An analytical direct correlatio...

The corrosion of an Au anode in a solution of 1,2-diaminoethane (EDA) is studied by means of gravimetry. It is found that the products of corrosion of an Au electrode under galvanostatic conditions are reduced on a steel cathode with the formation of an electrolytic precipitate of Au. The kinetics of the electrochemical corrosion of gold in an EDA...

The kinetics of adsorption of salicylic acid on Sibunit was studied in an aqueous medium. The order of salicylic acid adsorption and the activation energy of adsorption were studied. The high adsorption capacity of Sibunit for this substance was found.

The electrochemical behavior of phthaloyl peroxide C8H4O4 on an Au disk electrode in a 0.05 M aqueous solution of Na2SO4 was studied by cyclic voltammetry (CVA). It demonstrated a high activity in cathodic reduction with the formation of an irreversible peak on the CVA curve at E =–0.81 V. Additionally, during the anodic oxidation of C8H4O4, the su...

The adsorption of 2,4-dichlorophenoxyacetic acid (2,4-D) as a typical herbicide from aqueous solutions on activated carbons prepared based on polyvinyl chloride by its alkaline dehydrochlorination and the subsequent heat treatment was studied. The structure of the activated carbon surface and the presence of functional groups on it were established...

The kinetics of adsorption of 2,4-dichlorophenoxyacetic acid (2,4-D) as a typical herbicide from aqueous solutions on coconut shell activated carbon was studied without preliminary treatment. The surface structure of the activated carbon, which is responsible for its properties, was characterized. The order of reaction in the process of adsorption...

The kinetics of adsorption of ethyl benzoate from solutions in ethanol on coconut shell activated carbon was studied. It was found that the kinetics of adsorption of ethyl benzoate can be described by pseudofirst-order and pseudo-second-order rate equations with the same accuracy. It was established that the adsorption isotherm at a concentration t...

The corrosion of a Au anode in a solution of 1,3-diaminopropane (DAP) is studied by means of gravimetry. It is found that the products of corrosion of Au electrode in galvanostatic conditions are reduced on a Pt cathode with the formation of either an electrolytic Au deposit or a colloidal solution of metallic Au, depending on the current strength....

The electrochemical corrosion of gold in solutions of 6,6-dimethyl-1,5-diazabicyclo[3.1.0]hexane (I) and 6-methyl-1,5-diazabicyclo[3.1.0]hexane (II) on a gold electrode is studied via cyclic voltammetry. It is shown that the galvanostatic electrolysis of weakly basic aqueous solutions of I and II on gold anodes results in the corrosion of Au electr...

The kinetics of adsorption of benzoyl peroxide from solutions in ethanol and n-hexane on coconut shell activated carbon was studied. It was found that the kinetics of adsorption of benzoyl peroxide is described by a pseudo-first-order rate equation. The adsorption isotherm of benzoyl peroxide at its equilibrium concentrations from 0.07 to 1.25 g/L...

The educational space in a modern society is sharply expanded in comparison with the last centuries. Objectively occurs globalization in sphere of education. In this connection has ripened necessity more or less precise definition of frameworks of educational space at teaching discipline « Chemistry of an environment ». First of all, it is necessar...

The adsorption of diclofenac sodium, a commonly used nonsteroidal antiarthritic drug, from aqueous solutions of different concentrations on a carbon adsorbent obtained from coconut shell was studied at different temperatures. Based on the experimental data, a mathematical model was constructed with the use of a mathematical design methodology to de...

The kinetics and thermodynamics of the adsorption of diclofenac sodium from aqueous solutions of different concentrations at different temperatures on activated carbon obtained from coconut shell were studied. It was found that the adsorption of diclofenac sodium is described by a pseudo-first-order equation and the adsorption isotherm at its conce...

Kinetics of N-chloromethylamine decomposition in an aqueous base medium and chloroform at different temperatures is studied. The decomposition of N-chloromethylamine is found to obey a second order equation in an aqueous base medium at an equimolar ratio of the reagents and a first order equation in chloroform with excess base. The activation energ...

The behavior of [1,2-bis(tert-butylperoxy)ethyl]benzene (I) on Pt electrode is studied by means of cyclic voltammetry (CVA). A comparison of the electrochemical properties of I and the properties of previously studied bridge-type 1,2,4,5-tetraoxane ((1,4)-1,4-dimethyl-7-(4-methylbenzyl)-2,3,5,6-tetraoxabicyclo[2.2.1]heptane) (II) shows that the bip...

Using UV spectrometry, we studied for the first time the regularities of AlkNHBr consumption in two variations of the formation of 1,2,3-trialkyldiaziridines in aqueous media: by mixing acetaldehyde and AlkNHBr in excess of AlkNH2 (method 1) and by the reaction of MeCH=NEt with EtNHBr in excess of EtNH2 (method 2). We determined the rate constants...

Electrochemical oxidation of tetracycline on a boron-doped diamond electrode in order to develop a method for purification of waste water from contamination by pharmaceutical agents was studied. It was found that under these conditions deep oxidation of tetracycline (TC) down to its full mineralization can take place. Using high resolution mass spe...

The electrochemical behavior of hexahydropyrimidine (HHP) on a boron-doped diamond electrode was studied. The obtained data were compared with the results of previous studies on the electrooxidation of HHP on platinum and gold electrodes. It was shown that different products can be obtained from one organic substance using different electrode mater...

The removal of tetracycline, carbamazepine, and diclofenac sodium from aqueous solutions by passing them through a column with thermally expanded graphite (TEG), which was synthesized from natural graphite, was studied. The method of numerical simulation was used to determine maximally possible breakthrough volumes for the adsorption of each of the...

Electrochemical oxidation of tetracycline on a boron doped diamond electrode within the stability potentials of water was studied in order to develop an approach for the purification of waste water containing medicinal agents. Cyclic voltammetry, HPLC, and high resolution mass spectrometry were used to establish that in the electrochemical oxidatio...

Thermally expanded graphite, which was obtained from natural graphite as a result of thermal treatment with acids, was used for the removal of tetracycline as a typical antibiotic. The isotherm of adsorption of tetracycline was satisfactorily described by the Langmuir, Temkin, and Freundlich equations. The kinetics of absorption of tetracycline on...

Studies of the electrochemical behavior of hexahydropyrimidine, 1,5-diazabicyclo[3.1.0]hexane, and 1,3-diaminopropane on a gold electrode via cyclic voltammetry allow us to conclude that gold anodes are subject to corrosion in presence these compounds, yielding complexes that migrate into the solutions and discharge on the counter electrode, produc...

Expanded graphite, which was prepared from natural graphite as a result of thermal treatment with acids, was used for the removal of the anticonvulsive preparation carbamazepine from aqueous solutions. The adsorption isotherm of carbamazepine was adequately described by the Langmuir, Temkin, and Freundlich equations. The adsorption of carbamazepine...

The kinetics and mechanism of the deep oxidation of sodium diclofenac on a boron-doped diamond electrode are studied to develop a technique for purifying wastewater from pharmaceutical products. The products of sodium diclofenac electrolysis are analyzed using cyclic voltammetry and nuclear magnetic resonance techniques. It is shown that the toxici...

The regularities of AlkNHBr consumption in the reaction of formation of 1,2-dialkyldiaziridines in aqueous media were studied for the first time by UV spectrometry. The rate constants of particular steps of the reaction were estimated starting from the possibility of formation of the precursor of 1,2-dialkyldiaziridine, N-halogenaminal, due to the...

The electrochemical synthesis of 3,12-dimethyl-7,8,15,16-tetraoxadispiro[5.2.5.2]hexadecane (1,2,4,5-tetraoxane) from 1,1-bis-hydroperoxy-4-methylcyclohexane on platinum electrode in a cell with separated and unseparated cathode and anode space in an aprotic solvent is conducted. The kinetics of electrochemical oxidation of 1,1-bis(hydroperoxy)-4-m...

The adsorption of a diclofenac sodium medicine from aqueous solutions of different concentrations on expanded graphite, which was obtained as a result of the thermal treatment of graphite with perchloric acid, was studied. The recovery of diclofenac sodium from aqueous solution on expanded graphite was as high as 98–99%.

Electrochemical degradation of diclofenac in aqueous solutions was studied using a thin-film boron-doped diamond electrode deposited onto a niobium plate. The process was monitored by means of UV spectroscopy and elemental analysis.

The possibility is shown of electrochemical synthesis of 3,12-dimethyl-7,8,15,16-tetraoxadispiro[5.2.5.2]hexadecane that belong to the class of 1,2,4,5-tetraoxanes by oxidation of 1,1-dihydroperoxy-4-methylcyclohexane using a Pt anode.

The hydrolysis of acetylsalicylic acid in the anolyte under the conditions of electrolysis was studied.

Oxidation of tetracycline® in an electrochemical cell with separated cathodic and anodic compartments on smooth platinum was studied. The extent of electrochemical degradation of tetracycline and the energy consumption for eliminating the biological activity of its aqueous solutions were estimated.

Electrochemical synthesis of pentamethylenediazirine at the Pt/Ti anode was conducted. The reaction is reversible. The rate constants of the direct and reverse processes were estimated. The product and current yields of the target compound approach to 100%.