Mirko Marinkovski - Academia.edu (original) (raw)

Papers by Mirko Marinkovski

Preparation and characterization of TiO 2-based nanosheets for photocatalytic degradation of acet... more Preparation and characterization of TiO 2-based nanosheets for photocatalytic degradation of acetylsalicylic acid: Influence of calcination temperature, Chemical Engineering

Quality of Life (Banja Luka) - APEIRON, 2021

The mosquitoes are a serious threat to public health, since they are known vectors of many life-t... more The mosquitoes are a serious threat to public health, since they are known vectors of many life-threatening diseases. Mosquito-borne diseases cause millions of deaths worldwide every year. While mosquitoes are important to maintain ecosystems, the aim is to keep them out of our personal space. People looking for alternatives to synthetic mosquito repellents may find that some natural repellents are effective in protecting them from bites. Natural insect repellents use natural ingredients such essential oils and other plant-based elements. Certain essential oils are effective and helpful in repelling mosquitoes, and are a natural alternative to the harsh chemicals in commercial bug sprays. These products are also likely to be less toxic to humans and the environment. Natural repellents and some essential oils may be effective in keeping mosquitoes away because they block their sense of smell. Many natural scents that are appealing to humans actually repel mosquitoes. Plant - based re...

Water Science & Technology, 2010

The adsorption of two substituted nitrophenols, namely 4-nitrophenol (4-NP) and 2,4-dinitrophenol... more The adsorption of two substituted nitrophenols, namely 4-nitrophenol (4-NP) and 2,4-dinitrophenol (2,4-DNP), from aqueous solutions onto perfil was studied using a fixed bed column. The theoretical solid diffusion control (SDC) model describing single solute adsorption in a fixed bed based on the Linear Driving Force (LDF) kinetic model was successfully applied to the investigated systems. The model parameters of solid diffusion coefficient, D S , axial dispersion coefficient, D L , and external mass transfer coefficient, k f , for the investigated systems were estimated by the means of a best fit approach. Some deviations were found between the predicted and the experimental data which reflect the fact that the assumptions of the model were not quite fulfilled for these experiments. It is necessary to adjust the values of the solid diffusion coefficient, the axial dispersion coefficient and the external mass transfer coefficient in order to obtain a satisfactory agreement between the simulated and the experimental breakthrough curves. A Biot number was used as an indicator for the intarparticle diffusion. The Biot number was found to decrease with the increase of bed depth, indicating that the film resistance increased or the intraparticle diffusion resistance decreased.

The novel trends in the separation processes are guided with designs of integrated membrane syste... more The novel trends in the separation processes are guided with designs of integrated membrane system for treatment of water resources. Membrane filtrat

The contemporary trends in green separation processes impose the need for application of natural,... more The contemporary trends in green separation processes impose the need for application of natural, low-cost and high-efficiency selective adsorbents within the processes for the treatment of drinking water supplies. Lately, nano-porous inorganic sorbents represent an ongoing trend for elimination of heavy metals from water resources. Natural zeolite clinoptilolite was used as a potential raw material for the purpose of removal of Co ions from model solutions. The experimental results were obtained in a laboratory scale batch glass reactor with continuous stirring at 400 rpm. The effects of operational parameters such as the initial concentration of Co ions in the aqueous solution, the mass of the nano-porous adsorbent and the pH were studied to optimize the conditions for maximum removal of Co ions.

Quality of Life (Banja Luka) - APEIRON, Jun 30, 2016

The novel trends in green separation processes impose the need for application of natural, low-ca... more The novel trends in green separation processes impose the need for application of natural, low-cast and high-effi ciency selective adsorbents, such as natural zeolite, within the processes for the treatment of drinking water supplies. Lately, nano-porous inorganic sorbents represent an ongoing trend for elimination of heavy metals from water resources. In the frame of this work, the nanoporous material, clinoptilolite,was applied for removal of Ni(II) ions fr om water resource. The experimental results were obtained in a laboratory scale batch glass reactor with continuous stirring at 400 rpm. The effects of the mass of the nano-porous adsorbent and the initial pH of the solution were studied to optimize the conditions for maximal removal of Ni(II) ions. MATLAB/Curve Fitting Toolboxwas implemented to determine the adequate adsorption isotherm as well as to optimize the equilibrium state of the investigated system.

Separation and Purification Technology, 2014

Turmeric oil was extracted from Curcuma Longa herb (turmeric root) using supercritical fluid extr... more Turmeric oil was extracted from Curcuma Longa herb (turmeric root) using supercritical fluid extraction (SFE) process. Full-face central composite design was employed to optimize operating parameters of the process. These parameters were pressure, temperature, solvent flow rate, particle size and addition of co-solvent (ethanol) that varied as 20-40 MPa, 40-60 °C, 5-15 g/min, 0-0.8 mm and 0-15 % of solvent rate, respectively. Turmeric oil yield found through Soxhlet extraction was 5.954 wt% of turmeric powder whereas through SFE, it varied from 2 to 5.3 wt%. Turmerone and curcumin were identified as principle compounds of turmeric essential oil, which were analyzed using Gas chromatography-mass spectrometry and Ultraviolet-visible Spectrophotometer, respectively. Experimental data of oil yield, Curcumin content and Turmerone content were fitted well in the Quadratic model. Optimized values of operating parameters for maximizing these responses were also predicted. Further, economic assessment of SFE of turmeric oil at industrial scale for 60 t/y production capacity was performed.

Quality of Life (Banja Luka) - APEIRON, 2017

Natural minerals from different localities in the Republic of Macedonia are selected for eliminat... more Natural minerals from different localities in the Republic of Macedonia are selected for elimination of Cr(VI) ions from water resources. For that aim are selected: aksil (Kriva Palanka), trepel (Bitola), SiO2 amorphous (Kozuf), pemza (Bojanciste). In this study, their adsorption capacity is analyzed using spectrophotometric method (UV/VIS Spectrophotometer). Results from the spectrophotometric analysis in all used examples gave us insight for the starting concentration of Cr(VI) before adsorption and concentration after adsorption. The physical, chemical and mineralogical characteristics of adsorbents are studied. XRD, TGA-DTA and FT-IR analysis are used for characterization of natural mineral materials. The surface area of the sorbents were measured by BET method. With aim to determine the optimum pH value for maximal removal of Cr(VI) ions, the point of zero charge, pHPZC, for investigated materials were obtained. The aim of the study is to select which adsorbent is more efficien...

International Journal of Environment and Pollution, 2006

The metal removal capability of Granular Activated Carbon (GAC) and natural zeolite is evaluated ... more The metal removal capability of Granular Activated Carbon (GAC) and natural zeolite is evaluated in this study using zinc as a model adsorbate. The equilibrium and kinetic characteristics of zinc adsorption on GAC and natural zeolite were studied in batch stirred tank experiments. The adsorption data for both systems were fitted by Langmuir, Freundlich, Langmuir-Freundlich, and Redlich-Peterson models. The parameters in the adsorption isotherms were estimated from the experimental equilibrium data using MATLAB. Using these data the best isotherm can be selected. The effect of initial concentration on the transient behaviour of zinc removal by GAC and natural zeolite was investigated. In this work two surface reaction models, namely a second order reversible reaction model and a second order irreversible reaction model for describing Zn(II) removal by GAC and natural zeolite, were employed. Modelling studies using two different second order surface reaction models demonstrated that it is very difficult to come to a general conclusion about which model has better ability.

Journal of the Serbian Chemical Society, 2001

The adsorption of basic dyes from aqueous solutions onto granular activated carbon and natural ze... more The adsorption of basic dyes from aqueous solutions onto granular activated carbon and natural zeolite was studied using a fixed bed column. The design procedures for fixed bed adsorption columns were investigated for two basic dyes Maxilon Goldgelb GL EC 400 % (MG-400) and Maxilon Schwarz FBL-01 300 % (MS-300). Acomputer program based on the solid diffusion control model has been developed. The model parameters: solid diffusion coefficient, DS, axial dispersion coefficient, DL and external mass transfer coefficient, kf for all the investigated systems were estimated by means of a best fit approach.

The aim of this article is characterization of natural zeolite (clinoptilolite) and its applicati... more The aim of this article is characterization of natural zeolite (clinoptilolite) and its application for removal of heavy metals from aqueous solution. Characterization of the natural zeolite from Beli Plast deposit, Kardjali, was conducted using: classical chemical analysis, XRD, SEM/EDS, DTA/TG/DTG, XRF, FTIR and BET. Based on the results of the chemical composition, XRD, SEM/EDS and FTIR analyses, it is evident that the major component of the working material (~ 95%) is clinoptilolite. In fact, the working material is alumino-silicate with high silicate module and it is of clinoptilolite type. The applied material has the specific surface area of 31.3 m 2 /g determined by BET method with nitrogen adsorption. The maximum capacity of clinoptilolite towards zinc, nickel and cobalt removal under the studied conditions is approximately 3.5 mg/g, for copper and manganese is approximately 4.5 mg/g and for lead ions is approximately 30 mg/g. Natural zeolite (clinoptilolite) was used as a potential raw material for the purpose of removal of Cu(II), Zn(II), Mn(II), Pb(II), Co(II) and Ni(II) ions from model solutions. The experimental results were obtained in a laboratory scale batch glass reactor with continuous stirring at 400 rpm. The adsorption of studied heavy metal ions from solution were efficiently onto used adsorbent and approximately 90% from ions were removed from single ion solutions. Generally, it can be concluded that studied clinoptilolite is a potential raw material for effective removal of heavy metals ions from various types of waste waters.

NATO Science for Peace and Security Series B: Physics and Biophysics, 2011

ABSTRACT In this study the gas phase photocatalytic oxidation of naphthalene in the presence of T... more ABSTRACT In this study the gas phase photocatalytic oxidation of naphthalene in the presence of TiO2-based photocatalysts prepared by chemical vapor deposition (CVD) and the sol-gel method is examined. As precursors for the photocatalyst preparation TiCl4 was used for chemical vapor deposition (CVD), while for the sol-gel technique the precursor was titanium tetra-isopropoxide. The level of naphthalene degradation was examined with FTIR spectroscopy; the identification of the products obtained was performed by GC-MS measurements. The kinetics of the photooxidation reaction of naphthalene in excess of oxygen was investigated. It was found that the kinetics of naphthalene oxidation follow a first-order law; the rate constants were determined by means of mathematical modeling. Also, it was found that the rate limiting steps for naphthalene oxidation are diffusion of the components on the catalyst surface and transport through the films of the photocatalyst particles. The photocatalytic activity of TiO2-based photocatalysts prepared by CVD as a gas phase method and the sol-gel technique as a liquid method are compared. The photocatalysts showed an excellent efficiency for naphthalene degradation in the presence of oxygen; a complete mineralization of the aromatic toxic compound to CO2 and water was achieved.