Violetta Kozik - Academia.edu (original) (raw)

Papers by Violetta Kozik

International Journal of Molecular Sciences, Nov 26, 2021

This article is an open access article distributed under the terms and conditions of the Creative... more This article is an open access article distributed under the terms and conditions of the Creative Commons Attribution (CC BY

International Journal of Molecular Sciences, Dec 1, 2022

Materials, Nov 6, 2020

Possible use of potassium ferrate (VI) (K 2 FeO 4) for the treatment of landfill leachate (pH = 8... more Possible use of potassium ferrate (VI) (K 2 FeO 4) for the treatment of landfill leachate (pH = 8.9, Chemical Oxygen Demand (COD) 770 mg O 2 /L, Total Organic Carbon (TOC) 230 mg/L, Total Nitrogen (Total N) 120 mg/L, Total Phosphorus (Total P) 12 mg/L, Total Coli Count (TCC) 6.8 log CFU/mL (Colony-Forming Unit/mL), Most Probable Number (MPN) of fecal enterococci 4.0 log/100 mL, Total Proteolytic Count (TPC) 4.4 log CFU/mL) to remove COD was investigated. Central Composite Design (CCD) and Response Surface Methodology (RSM) were applied for modelling and optimizing the purification process. Conformity of experimental and predicted data (R 2 = 0.8477, R adj 2 = 0.7462) were verified using Analysis of Variance (ANOVA). Application of K 2 FeO 4 using CCD/RSM allowed to decrease COD, TOC, Total N, Total P, TCC, MPN of fecal enterococci and TPC by 76.2%, 82.6%, 68.3%, 91.6%, 99.0%, 95.8% and 99.3%, respectively, by using K 2 FeO 4 0.390 g/L, at pH = 2.3 within 25 min. Application of equivalent amount of iron (as FeSO 4 × 7H 2 O and FeCl 3 × 6H 2 O) under the same conditions allowed to diminish COD,

Dyes and Pigments, May 1, 2015

Six tetraphenyl derivatives of arylpropionic acids (profens) were synthesized in search for impro... more Six tetraphenyl derivatives of arylpropionic acids (profens) were synthesized in search for improved novel photosensitizers that might find application in photodynamic therapy (PDT) of various cancers. Our goal was to alter hydrophobic-hydrophylic characteristics of the tetraphenylporphyrin ring by substitution with propionyl derivatives. As starting materials we used profens known primarily from their widespread use as non-steroidal anti-inflammatory drugs (ibuprofen, naproxen, ketoprofen, fenoprofen, fluorbiprofen) and 2-phenylpropionic acid (model compound). The new compounds were characterized using spectroscopic and photophysical methods with focus given to measurement of molecules' lifetime in excited triplet state, time-resolved singlet oxygen phosphorescence and measurement of photostability. Fluorescence quantum yields were also determined; data revealed no planarity changes in the porphyrin molecule following substitution with profens.

Journal of Nanoscience and Nanotechnology, May 1, 2019

Chemically functionalized graphene oxides could be used as novel drug carriers. Covalent alterati... more Chemically functionalized graphene oxides could be used as novel drug carriers. Covalent alterations of graphene oxides lead to surface changes via formation of chemical bonding while noncovalent ones involve van der Waals forces, hydrogen bonding, and-stacking interactions. Covalent modifications appear to be superior as they can yield compounds with desired properties and carriers prepared by other methods are less stable. Synthesis of graphene oxide-iminodiacetic acid and graphene oxide-glycine involves nucleophilic substitution of graphene oxide nanoparticles with iminodiacetic acid or glycine. As the first step, iminodiacetic acid or glycine were transformed into iminodiacetic acid or glycine methyl ester hydrochlorides, respectively, for C-terminus protection. The obtained product, activated in situ, was then used to form amide bonds between graphene oxide and iminodiacetic acid or glycine.

Cancers, Mar 19, 2021

RSC Advances, 2016

A hybrid approach that combines 3D and 4D-QSAR methods based on grid and neural paradigms with au... more A hybrid approach that combines 3D and 4D-QSAR methods based on grid and neural paradigms with automated IVE-PLS procedure was examined to identify the pharmacophore pattern for cholic acid derivatives as potential drug absorption promoters.

Applied sciences, Feb 23, 2023

Architecture Civil Engineering Environment, 2016

Energies, Sep 3, 2020

Sulfolane in contact with water and oxygen forms acidic (by-) products that are major factors in ... more Sulfolane in contact with water and oxygen forms acidic (by-) products that are major factors in accelerating the corrosion of carbon/stainless steel. In consequence, water-induced corrosion damage can be a serious problem in industrial systems. Hence, the determination of the corrosion resistance of AISI 1010 steel immersed in sulfolane containing 0 to 6 vol.% water was the principal objective of the study. Evaluation of the corrosion resistance of steel electrodes was performed using a potentiodynamic technique and scanning Kelvin probe microscopy. It was observed that the corrosion products layer that formed on the surface of AISI 1010 steel partially protects it against corrosion in sulfolane with a water concentration in the range from 1 vol.% to 4 vol.%. Interestingly, amounts of water above 4 vol.% cause a breakdown of the corrosion products layer and deteriorate the corrosion resistance of AISI 1010 steel as well. Moreover, the relationship between the fractal dimension, corrosion degree of the steel surface and water concentration in sulfolane was investigated. The fractal dimension was determined using 2D grayscale images of AISI 1010 steel registered through a scanning electron microscope. It was noticed that both the fractal dimension and the corrosion degree rose with the increased water concentration in sulfolane.

Monatshefte Fur Chemie, Aug 24, 2011

A series of mono-alkylcarboxylic acid derivatives of tetraphenylporphyrin have been prepared. All... more A series of mono-alkylcarboxylic acid derivatives of tetraphenylporphyrin have been prepared. All the porphyrins were completely characterized by use of mass, 1 H NMR, UV-visible, and fluorescence spectroscopy. Experimental log P were determined by use of reversedphase thin-layer chromatography with use of log P Rekker. These porphyrins are potential photosensitizers in photodynamic therapy.

Food Chemistry, Nov 1, 2012

and Ca) were determined in the herbs and their infusions consumed for medical purposes in Poland ... more and Ca) were determined in the herbs and their infusions consumed for medical purposes in Poland such as chamomile (Matricaria chamomilla L.), peppermint (Mentha xpiperita), melissa (Melissa officinalis), sage (Salvia officinalis), nettle (Urtica dioica), linden (Tilia vulgaris) and St. John's wort (Hypericum calycinum). Dry digestion procedure for total concentration and wet digestion procedure for infusions were applied under optimized conditions for dissolution of medicinal herbs. Element concentrations in herbs and their infusions were determined by ICP-OES. The accuracy and precision were verified against NCS DC 73349-bush branches and leaves certified reference material. The result of total concentrations of elements in herb leaves shows that all herbs contain most of the elements, except K and P, in the lg/g range, and that elemental concentrations varied widely. Moreover, on the basis of experimental results for the extraction efficiencies, the elements in herb infusions were classified into three specific groups: highly-extractable (>55%) including K; moderately-extractable (20-55%) including Mg, Na, P, B, Zn and Cu and poorly-extractable (<20%) including Al, Fe, Mn, Ba, Ca and Sr. The results of analysis were evaluated statistically using ANOVA one-way and three-way analysis of variance, variance correlation test and Spearman's test.

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Journal of Coordination Chemistry, Jun 20, 2011

[ReBr2(O)(OCH3)(PPh3)2] has been obtained in the reaction of [ReBr3O(PPh3)2] or [ReBr2(η-N2COPh-N... more [ReBr2(O)(OCH3)(PPh3)2] has been obtained in the reaction of [ReBr3O(PPh3)2] or [ReBr2(η-N2COPh-N′,O)(PPh3)2] with an excess of methanol. [ReBr2O(OMe)(PPh3)2] crystallizes in the triclinic space group P-1. The complex was characterized by infrared, UV-Vis, and H NMR spectra. The electronic structure of the obtained compound has been calculated using the DFT/TD–DFT method.

Journal of Cleaner Production, May 1, 2017

Odor abatement comprises legal, management, technology and monitoring issues. Odor treatment tech... more Odor abatement comprises legal, management, technology and monitoring issues. Odor treatment technologies based on biotechnology applications are reviewed. Biofiltration, biotrickling filtration and bioscrubbing are the main technologies. Three less known technologies based on specific bioreactor designs are also outlined. Further research is needed for continuing the refinement of odor treatment methods.

The crystal and molecular structures of five di-(2,5-dimethylpyrrole) and one tri-(2,5-dimethylpy... more The crystal and molecular structures of five di-(2,5-dimethylpyrrole) and one tri-(2,5-dimethylpyrrole) derivatives have been determined. These compounds were synthesized from the respective diamino derivatives and hexane-2,5-dione in direct and simple reactions. The molecular packings are largely based on C-H•••π interactions.

Jpc – Journal Of Planar Chromatography – Modern Tlc, Apr 1, 2015

Materials, Feb 20, 2022

Materials, Jun 4, 2020

Sulfolane-induced corrosion can lead to severe impairment in industrial systems. Therefore, deter... more Sulfolane-induced corrosion can lead to severe impairment in industrial systems. Therefore, determination of solvent corrosivity is valid. Under standard conditions, pure sulfolane is considered to be thermally stable and chemically inert, hence non-aggressive towards carbon/stainless steel. Unfortunately, the sulfolane-evoked corrosion of the industrial installations is observed for sulfolane-based systems polluted by small quantities of oxygen, water and some oxidizing agents. Moreover, sulfolane decomposition with formation of corrosive (by-)products can be escalated by some process parameters, e.g., temperature. The main objective of this study was to determine the corrosion resistance of AISI 1010 steel immersed in sulfolane at temperatures ranging from 25 to 230 • C. Evaluation of the corrosion damage was carried out using electrochemical techniques and scanning probe/electron microscopy, respectively. The general corrosion tendency, corrosion rate and surface corrosion degree were taken into account as well. It was noticed that the corrosion rate linearly increases with the enhancement of sulfolane temperature. Moreover, the interfacial reaction of steel with sulfolane resulted in the formation of corrosion product layer, which is a physical barrier between the corrosive environment and steel improving corrosion resistance of the latter. In fact, the increment of the sulfolane temperature caused a gradual breakdown of the protective layer and the increase in the corrosion degree of the investigated steel. Finally, it was found that the corrosion degree doubles approximately every 42 • C.