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Acta Chimica Slovenica

Dilek Yıldız, Feyyaz Keskin, Ahmet Demirak
In this study, Turkish Sweetgum bark was used as a new biosorbent to investigate the removal of hazardous 2,4 dichlorophenol (2,4-DCP) from aqueous solutions in batch biosoption experiments. The effective usage of Turkish sweetgum bark is a meaningful work for environmental utilization of agricultural residues. The effects of experimental parameters like solution pH, contact time, initial concentration of adsorbate and amount of bisorbent dosage were investigated in a series of batch studies at 25 °C. Taguchi's Orthogonal Array (OA) analysis was used to find the best experimental parameters for the optimum design process in this study...
2017: Acta Chimica Slovenica
Qi Wang, Chunlei Ma, Wanjun Li, Meng Fan, Songdong Li, Lihua Ma
Eggshell membrane (ESM) is selected as biotemplate to prepare MnO2 submicroparticles (SMPs) using Chinese Brush with sodium hydroxide solution. The size with average 710 nm of the obtained materials is in good consistency with the microsructured biotemplate. An efficient and convenient absorbent for methylene blue (MB) is developed. The removal efficiency could reach up to 93% in 35 min under room temperature without pH adjusting owing to the excellent adsorption from ESM itself and hydroxyl group formed on the surface of MnO2 crystal in the aqueous solution...
2017: Acta Chimica Slovenica
Li-Na Wang, Lin Fu, Jia-Wei Zhu, Yu Xu, Meng Zhang, Qi You, Wang Peng, Jie Qin
Three coordination polymers, [Cd(L)2(H2O)2]n (1), [Zn(L)2(H2O)2]n (2) and [Mn(L)2]n (3) were prepared by reacting 5-(3-pyridyl)-1,3,4-oxadiazole-2-thioacetic acid (HL) with corresponding metal acetate in DMF/CH3CN medium under solvothermal condition. The isolated complexes were characterized by elemental analysis and infrared spectroscopy. The X-ray crystallographic analysis revealed double strand structure of 1 and 2, and 3D framework of 3. The different structures of these complexes indicate that the configuration of the ligand and the reaction condition play a key role in self-assemble of complexes 1-3...
2017: Acta Chimica Slovenica
Beti Vidmar, Romana Marinšek Logar, Mario Panjičko, Lijana Fanedl
Microalgae biomass has a great potential in search for new alternative energy sources. They can be used as a substrate for the biogas production in anaerobic digestion. When using microalgae, the efficiency of this process is hampered due to the resistant cell wall. In order to accelerate the hydrolysis of cell wall and increase the efficiency of biogas production we applied two different pretreatments - biological and thermal under mesophilic and thermophilic conditions. During biological pretreatment we incubated microalgae with anaerobic hydrolytic bacteria Pseudobutyrivibrio xylanivorans Mz5T...
2017: Acta Chimica Slovenica
Rajinder Singh, Jigmet Ladol, Heena Khajuria, Haq Nawaz Sheikh
A facile approach has been devised for the preparation of magnetic NiFe2O4 photocatalyst (NiFe2O4-NG) supported on nitrogen doped graphene (NG). The NiFe2O4-NG composite was synthesized by one step hydrothermal method. The nanocomposite catalyst was characterized by Powder X-ray diffraction (PXRD), Scanning electron microscopy (SEM), Transmission electron microscopy (TEM), Fourier transform infrared spectroscopy (FTIR), Ultraviolet-visible spectroscopy (UV-Vis) and Vibrating sample magnetometry (VSM). It is found that the combination of NiFe2O4 nanoparticles with nitrogen-doped graphene sheets converts NiFe2O4 into a good catalyst for methylene blue (MB) dye degradation by irradiation of visible light...
2017: Acta Chimica Slovenica
Jingwen Shi, Chongchong Xue, Lingqian Kong, Daopeng Zhang
Three tetracyanide-containing building blocks K2[M(CN)4] (M = Ni, Pd, Pt) and one semi-closed macrocycle seven-coordinated manganese(II) compound have been employed to assemble cyanide-bridged heterometallic complexes, resulting in three cyanide-bridged MII-MnII complexes: [Mn(L)][Ni(CN)4] · 2H2O (1) [Mn(L)][Pd(CN)4] (2) and [Mn(L)][Pt(CN)4] (3) (L = 2,6-bis[1-(2-(N-methylamino)ethylimino)ethyl]pyridine). Single-crystal X-ray diffraction analysis shows their similar one-dimensional structure consisting of the alternating [Mn(L)]2+ species and [M(CN)4]2- building blocks, generating a cyanide-bridged neutral polymeric chain...
2017: Acta Chimica Slovenica
Bindhu Muthunadar Rajam, Parimaladevi Ramasamy, Umadevi Mahalingam
Gold nanoparticles were synthesized using Ananas comosus as reducing agent. UV-visible spectra show the surface plasmon resonance peak at 544 nm. TEM measurement shows that the formation of monodispersed spherical nanoparticles with average size of 7 nm. Crystalline nature of the nanoparticles was evident from TEM images and peaks in the XRD pattern. FTIR analysis provides the presence of biomolecules responsible for the reduction and capping of the prepared gold nanoparticles. A selective and sensitive method is proposed for detecting mercury based on the SPR change of gold nanoparticles...
2017: Acta Chimica Slovenica
Meysam Najafi
The possibility of dichloroacetylene-sensing on carbon nanocone sheet and carbon germanium nanocone sheet surfaces has been investigated. The effects of nitrogen functionalization and dimethyl sulfoxide on the adsorption of dichloroacetylene gas on carbon nanocone sheet and carbon germanium nanocone sheet surfaces were investigated. Results reveal that adsorption of dichloroacetylene on studied nanocone sheets were exothermic. Results show that, adsorption energy value of dichloroacetylene on carbon germanium nanocone sheet surface were more negative than corresponding values of carbon nanocone sheet...
2017: Acta Chimica Slovenica
Rafat Milad Mohareb, Nadia Youssef Megally Abdo, Fatma Omar Al-Farouk
Novel tetrahydrobenzo[b]thienopyrole derivatives are synthesized from 2-amino-3-cyano-4,5,6,7-tetrahydrobenzo[b]thiophene (1) through its reaction with α-chloroacetone to give the corresponding N-alkyl derivative 3. Compound 3 undergoes ready cyclization in sodium ethoxide solution to give the tetrahydrobenzo[b]thienopyrrole 4. The latter compound 4 is used as the key starting material for the synthesis of thiophene, thieno[2,3-b]pyridine and pyran derivatives. The cytotoxicity of the synthesized products towards the human cancer cell lines namely gastric cancer (NUGC), colon cancer (DLD-1), liver cancer (HA22T and HEPG-2), breast cancer (MCF-7), nasopharyngeal carcinoma (HONE-1) and normal fibroblast (WI-38) cell lines are measured...
2017: Acta Chimica Slovenica
Nikola Maraković, Goran Šinko
Modern drug discovery is mainly based on the de novo synthesis of a large number of compounds with a diversity of chemical functionalities. Though the introduction of combinatorial chemistry enabled the preparation of large libraries of compounds from so-called building blocks, the problem of successfully identifying leads remains. The introduction of a dynamic combinatorial chemistry method served as a step forward due to the involvement of biological macromolecular targets (receptors) in the synthesis of high affinity products...
2017: Acta Chimica Slovenica
Mykhailo Luk'yanov, Evgeny Goreshnik, Vasyl Kinzhybalo, Marian Mys'kiv
Four copper(I) π-complexes: [Cu(Hapn)NO3]NO3 (1), [Cu(Hapn)(H2O)2]SiF6 (2), [Cu(Hapn)(H2O)BF4]BF4·H2O (3) and [Cu(Hapn)(NH2SO3)2] (4) were prepared using alternating-current electrochemical technique, starting from alcohol solutions of 3-(prop-2-en-1-ylamino)propanenitrile (apn) titrated with appropriate acid and copper(II) salts (Cu(NO3)2 · 3H2O, CuSiF6 · 4H2O, Cu(BF4)2 · 6H2O or Cu(NH2SO3)2 · xH2O, respectively). Obtained compounds were characterized by single-crystal X-ray diffraction and partially by IR spectroscopy...
2017: Acta Chimica Slovenica
Nevenka Kragelj Lapanja, Renata Toplak Časar, Sabina Jurca, Bojan Doljak
Mutagenic impurities (MIs) are of serious concern for pharmaceutical industry, regulatory agencies and public health. The first guideline addressing the control of genotoxic impurities (GTIs) dates back to 2006. Since then there have been several updates and refinements, which eventually resulted in the guideline, published by the International Conference on Harmonisation (ICH) in June 2014. The ICH M7 guideline, compared to previous ones, offers greater flexibility in terms of control strategies for GTIs in drug substances...
2017: Acta Chimica Slovenica
Jasmina Korenak, Subhankar Basu, Malini Balakrishnan, Claus Hélix-Nielsen, Irena Petrinic
In recent years, membrane technology has been widely used in wastewater treatment and water purification. Membrane technology is simple to operate and produces very high quality water for human consumption and industrial purposes. One of the promising technologies for water and wastewater treatment is the application of forward osmosis. Essentially, forward osmosis is a process in which water is driven through a semipermeable membrane from a feed solution to a draw solution due to the osmotic pressure gradient across the membrane...
2017: Acta Chimica Slovenica
Sándor Kapitány, Erzsébet Sóki, József Posta, Áron Béni
We have developed a chromium speciation and preconcentration method with the use of the graphite furnace atomic absorption spectrometry (GFAAS) technique. This method is based on single-drop microextraction (SDME) technique. Nowadays the microextractions have become popular, because low amount of organic solvent needs to be used for the separation. The sample was introduced into the extraction cell with a single chloroform droplet. For the separation and enrichment of chromium species, an ion-pair forming compound was used...
2017: Acta Chimica Slovenica
Zakir Imamaliyeva, Mirzaly Gasanly, Akber Gasymov, Baba Babanly
Phase equilibria in the Tl5Te3-Tl9SbTe6-Tl9GdTe6 system were experimentally studied by thermal analysis, X-ray diffraction and microhardness measurements applied to equilibrated alloys. Some isopleth sections, isothermal section at 760 K, and also projections of the liquidus and solidus surfaces, were constructed. A continuous series of solid solutions was found in this system. Solid solutions crystallize in the tetragonal Tl5Te3 structure type.
2017: Acta Chimica Slovenica
Abdolhamid Hatefi-Mehrjardi, Mohammad Ali Karimi, Azam Barani, Mahdiyeh Soleymanzadeh
A selective and sensitive electrochemical sensor was studied for determination of levodopa (LD) in the presence of uric acid (UA) and ascorbic acid (AA) using poly-dianix blue and multi-walled carbon nanotubes (PDB/MWCNTs) modified glassy carbon electrode. Cyclic voltammetry, differential pulse voltammetry, and chronoamperometry methods were applied to investigate the electrocatalytic oxidation of LD, UA and AA in aqueous solutions. By DPV technique, LD, UA and AA give oxidation peaks at 0.380, 0.520 and 0...
2017: Acta Chimica Slovenica
Yong-Jun Han, Li Wang, Qing-Bin Li, Ling-Wei Xue
A new cobalt(II) complex, [Co(L1)2(OH2)2] (1), was prepared by the reaction of 3-bromo-5-chlorosalicylaldehyde (HL1) with cobalt nitrate in methanol. Reaction of 1 with cyclopropylamine in methanol afforded the Schiff base cobalt(II) complex, [Co(L2)2] (2), where L2 is the deprotonated form of 2-bromo-4-chloro-6-(cyclopropyliminomethyl)phenol (HL2). The complexes have been characterized by elemental analyses, IR spectroscopy, and single-crystal X-ray diffraction. The L1 ligand coordinates to the Co atom through the phenolate O and carbonyl O atoms, while the L2 ligand coordinates to the Co atom through the phenolate O and imino N atoms...
2017: Acta Chimica Slovenica
Mohammad Ali Ghasemzadeh, Bahar Molaei, Mohammad Hossein Abdollahi-Basir, Farzad Zamani
In this research an efficient synthesis of a novel nanocomposite including SiO2@(3-aminopropyl)triethoxysilane-coated cobalt oxide (Co3O4) nanocomposite has been reported by three step method. The structure and magnetic characterization of Co3O4@SiO2@NH2 have been done by using various spectroscopic analyses which include FT-IR, X-ray powder diffraction, scanning electron microscopy, transmission electron microscopy, energy dispersive X-ray spectroscopy and vibrating sample magnetometry. Amino-functionalized SiO2 coated Co3O4 nanocomposite exhibited superparamagnetic behavior and strong magnetization at room temperature...
2017: Acta Chimica Slovenica
Wei Gao, Mohammad Reza Farahani, Muhammad Imran
The Randic Connectivity Index R(G) is one of the oldest connectivity index, introduced by Randić in 1975. Another connectivity indices is the Sum-Connectivity Index X(G) introduced in 2008 by Zhou and Trinajstić. Recently in 2011, a modification of the Randic Connectivity Index of a graph G was introduced by Dvorak et al. In this paper, we compute these connectivity topological indices for a family of molecular graphs known as titania nanotubes TiO2(m,n).
2017: Acta Chimica Slovenica
Hui-Yee Gan, Li-Eau Leow, Siew-Teng Ong
The effectiveness of using TiO2 and corn cob films to remove Malachite Green oxalate (MG) and Acid Yellow 17 (AY 17) from binary dye solution was studied. The immobilization method in this study can avoid the filtration step which is not suited for practical applications. Batch studies were performed under different experimental conditions and the parameters studied involved initial pH of dye solution, initial dye concentration and contact time and reusability. The equilibrium data of MG and AY 17 conform to Freundlich and Langmuir isotherm model, respectively...
2017: Acta Chimica Slovenica
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