In addition to the subject-matter theoretical knowledge acquired during undergraduate and especially postgraduate studies future young scientists must also acquire the accompanying academic skills. This skillset will enable them to plan and conduct research in accordance with the scientific method, but also to present the results of that research in suitable forms. No result and no new knowledge derived from research is valuable in itself, as long as it is not presented to the scientific community and society as a whole. This dissemination is most often done through the peer-reviewed publishing in scientific journals. Hence acquiring the skill of writing scientific publications must be an integral part of education, eg. part of the acquired academic skills. However, currently that is not the case in all scientific environments and a significant number of (young) scientists and researchers do not possess all the necessary knowledge and skills to write academic articles, especially when it comes to the standard form and technical preparations. This skill-gap often results in a significant number of submitted papers to be rejected or sent back for resubmission even before they reach the Editor's desk. In an effort to provide an academic-writing-skill resource for young academics in the field of chemistry, this article, points out the general principles of a well-written and prepared paper, indicates the most common errors and omissions, and suggests ways to prevent them. In addition, the article is considering the current state of academic skills in, primarily, less developed scientific environments. and the causes of such a state.
{"title":"Read this first! How to prepare a manuscript for submission to a chemical science journal","authors":"Anja Dekanski, Aleksandar Dekanski","doi":"10.2298/jsc230505055d","DOIUrl":"https://doi.org/10.2298/jsc230505055d","url":null,"abstract":"In addition to the subject-matter theoretical knowledge acquired during undergraduate and especially postgraduate studies future young scientists must also acquire the accompanying academic skills. This skillset will enable them to plan and conduct research in accordance with the scientific method, but also to present the results of that research in suitable forms. No result and no new knowledge derived from research is valuable in itself, as long as it is not presented to the scientific community and society as a whole. This dissemination is most often done through the peer-reviewed publishing in scientific journals. Hence acquiring the skill of writing scientific publications must be an integral part of education, eg. part of the acquired academic skills. However, currently that is not the case in all scientific environments and a significant number of (young) scientists and researchers do not possess all the necessary knowledge and skills to write academic articles, especially when it comes to the standard form and technical preparations. This skill-gap often results in a significant number of submitted papers to be rejected or sent back for resubmission even before they reach the Editor's desk. In an effort to provide an academic-writing-skill resource for young academics in the field of chemistry, this article, points out the general principles of a well-written and prepared paper, indicates the most common errors and omissions, and suggests ways to prevent them. In addition, the article is considering the current state of academic skills in, primarily, less developed scientific environments. and the causes of such a state.","PeriodicalId":17489,"journal":{"name":"Journal of The Serbian Chemical Society","volume":"1 1","pages":""},"PeriodicalIF":1.0,"publicationDate":"2023-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"68517678","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"化学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Marijana Kostic, Nikola Radnovic, Marko Rodic, Holló Barta, Ljiljana Vojinovic-Jesic, Mirjana Radanovic
Aminoguanidine derivatives are the focus of research because of their various biological activities, such as antiviral, antibacterial, analgesic, antioxidant, and anticancer. Their complexes with different metals are also examined and many of them show significant biological activity, too. Besides, some of the complexes show good photoluminescent properties and are used for the preparation of photoelectronic devices. In accordance, the synthesis, physicochemical, structural, and thermal characterization of the complexes of 2-acetylpyridine aminoguanidine (L) with copper(II) is described here. Under different reaction conditions, Cu(II) with L gives three complexes of different compositions. By varying the strength of basicity of the deprotonating agent used, it was proven here that the Schiff base could be coordinated in neutral or monoanionic form. In the presence of pyridine, a coordination polymer is obtained, while in the presence of ammonia/lithium acetate two different monomeric complexes were crystallized. Their physicochemical and thermal properties, as well as molecular and crystal structure, are determined.
{"title":"Reactions of 2-acetylpyridine aminoguanidine with Cu(II) under different reaction conditions","authors":"Marijana Kostic, Nikola Radnovic, Marko Rodic, Holló Barta, Ljiljana Vojinovic-Jesic, Mirjana Radanovic","doi":"10.2298/jsc230707060k","DOIUrl":"https://doi.org/10.2298/jsc230707060k","url":null,"abstract":"Aminoguanidine derivatives are the focus of research because of their various biological activities, such as antiviral, antibacterial, analgesic, antioxidant, and anticancer. Their complexes with different metals are also examined and many of them show significant biological activity, too. Besides, some of the complexes show good photoluminescent properties and are used for the preparation of photoelectronic devices. In accordance, the synthesis, physicochemical, structural, and thermal characterization of the complexes of 2-acetylpyridine aminoguanidine (L) with copper(II) is described here. Under different reaction conditions, Cu(II) with L gives three complexes of different compositions. By varying the strength of basicity of the deprotonating agent used, it was proven here that the Schiff base could be coordinated in neutral or monoanionic form. In the presence of pyridine, a coordination polymer is obtained, while in the presence of ammonia/lithium acetate two different monomeric complexes were crystallized. Their physicochemical and thermal properties, as well as molecular and crystal structure, are determined.","PeriodicalId":17489,"journal":{"name":"Journal of The Serbian Chemical Society","volume":"75 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2023-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"135550336","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"化学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Evgeny Bulanov, Anastasyya Vasileva, Oxana Golitsyna, Alyona Shvareva, Alexander Knyazev
Apatites, being one of the most numerous mineral-like families of compounds, are considered as a matrix for binding lead ions, which is dangerous for the biosphere. The crystal-chemical (composition, structure) and thermophysical aspects (thermal expansion) are considered as the basis for analyzing the properties of this kind of material. It is suggested that substances of the composition Pb5(AIVO4)2(BVIO4), Pb5(AIVO4)(CVO4)2 can be a perspective form of lead binding materials based on compounds with the structure of apatite (AIV = Si, Ge; BVI = S, Cr; CV = P). Such compounds, as it was shown by DTA and HTXRD experiments, are distinguished by the absence of polymorphism and abnormal ordering of the structure. Also, they have relatively low values of thermophysical indicators (the rate of change of linear thermal expansion coefficients is ~ 0.02-0.03?106 K-1 per K; values of the volume thermal expansion coefficients are 40-70?106 K-1). Compounds Pb5(SiO4)(PO4)2 (a = 9.78782(16) ?, c = 7.31084(16) ?, V = 606.555(23) ?3, R-bragg = 4.694 %) and Pb5(GeO4)(PO4)2 (a = 9.87697(12) ?, c = 7.33136(11) ?, V = 619.388(17) ?3, R-bragg = 1.730 %) were obtained, identified and crystallographically characterized for the first time.
磷灰石是数量最多的类矿物化合物家族之一，被认为是结合铅离子的基质，对生物圈是危险的。晶体化学(组成、结构)和热物理(热膨胀)是分析这类材料性能的基础。结果表明，Pb5(AIVO4)2(BVIO4)、Pb5(AIVO4)(CVO4)2组成的物质可能是基于磷灰石(AIV = Si, Ge;BVI = S, Cr;CV = P)。DTA和HTXRD实验表明，这类化合物没有多态性，结构有序异常。它们的热物理指标值也相对较低(线性热膨胀系数的变化率为~ 0.02 ~ 0.03?106k -1 / K;体积热膨胀系数为40-70?106 k - 1)。首次得到了Pb5(SiO4)(PO4)2 (a = 9.78782(16) ?， c = 7.31084(16) ?， V = 606.555(23) ?3, R-bragg = 4.694%)和Pb5(GeO4)(PO4)2 (a = 9.87697(12) ?， c = 7.33136(11) ?， V = 619.388(17) ?3, R-bragg = 1.730%)化合物，并进行了鉴定和晶体学表征。
{"title":"Search for new apatite-like phases for lead utilization based on crystal structure and thermal expansion","authors":"Evgeny Bulanov, Anastasyya Vasileva, Oxana Golitsyna, Alyona Shvareva, Alexander Knyazev","doi":"10.2298/jsc230722069b","DOIUrl":"https://doi.org/10.2298/jsc230722069b","url":null,"abstract":"Apatites, being one of the most numerous mineral-like families of compounds, are considered as a matrix for binding lead ions, which is dangerous for the biosphere. The crystal-chemical (composition, structure) and thermophysical aspects (thermal expansion) are considered as the basis for analyzing the properties of this kind of material. It is suggested that substances of the composition Pb5(AIVO4)2(BVIO4), Pb5(AIVO4)(CVO4)2 can be a perspective form of lead binding materials based on compounds with the structure of apatite (AIV = Si, Ge; BVI = S, Cr; CV = P). Such compounds, as it was shown by DTA and HTXRD experiments, are distinguished by the absence of polymorphism and abnormal ordering of the structure. Also, they have relatively low values of thermophysical indicators (the rate of change of linear thermal expansion coefficients is ~ 0.02-0.03?106 K-1 per K; values of the volume thermal expansion coefficients are 40-70?106 K-1). Compounds Pb5(SiO4)(PO4)2 (a = 9.78782(16) ?, c = 7.31084(16) ?, V = 606.555(23) ?3, R-bragg = 4.694 %) and Pb5(GeO4)(PO4)2 (a = 9.87697(12) ?, c = 7.33136(11) ?, V = 619.388(17) ?3, R-bragg = 1.730 %) were obtained, identified and crystallographically characterized for the first time.","PeriodicalId":17489,"journal":{"name":"Journal of The Serbian Chemical Society","volume":"101 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2023-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"135594234","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"化学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Elena Mollova, Emilia Ivanova, Sevdalina Turmanova, Aleksandar Dimitrov
The presence of microplastics in different ecosystems has been intensively studied since the beginning of the 21st century. They have since been found in all components of the environment as well as in a number of organisms. Microplastics is a term for particles (MPs) whose size is 1 ?m - 5 mm that are formed during the breakdown of larger plastic products or are produced in microsizes for various industrial and cosmetic products. The distribution of these particles is due to their rapid transportation over large distances which is facilitated mainly by their small size and low density. There are still no uniform methods and standardised procedures for sampling and analysis. Therefore, the facts about the occurrence, distribution and threats to ecosystems and human health from MPs are not yet fully understood. This literature review is a broad presentation of the state of knowledge on the distribution of MPs in the atmosphere, water, soil, and organisms. In addition, this document describes the most widely used methods for separation, identification and characterisation of microplastics.
{"title":"Microplastics - ecosystem pollutants (review)","authors":"Elena Mollova, Emilia Ivanova, Sevdalina Turmanova, Aleksandar Dimitrov","doi":"10.2298/jsc230516073m","DOIUrl":"https://doi.org/10.2298/jsc230516073m","url":null,"abstract":"The presence of microplastics in different ecosystems has been intensively studied since the beginning of the 21st century. They have since been found in all components of the environment as well as in a number of organisms. Microplastics is a term for particles (MPs) whose size is 1 ?m - 5 mm that are formed during the breakdown of larger plastic products or are produced in microsizes for various industrial and cosmetic products. The distribution of these particles is due to their rapid transportation over large distances which is facilitated mainly by their small size and low density. There are still no uniform methods and standardised procedures for sampling and analysis. Therefore, the facts about the occurrence, distribution and threats to ecosystems and human health from MPs are not yet fully understood. This literature review is a broad presentation of the state of knowledge on the distribution of MPs in the atmosphere, water, soil, and organisms. In addition, this document describes the most widely used methods for separation, identification and characterisation of microplastics.","PeriodicalId":17489,"journal":{"name":"Journal of The Serbian Chemical Society","volume":"1 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2023-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"136202597","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"化学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
The influence of sulfate-reducing bacteria Desulfovibrio desulfuricans on stainless steel SS 202 corrosion in neutral media was studied in detail using weight loss and electrochemical routes. The bacterial activity resulted in material loss with an average rate of 0.015 mmpy. The scanning electron microscopy (SEM) analysis showed a significant increase in the sessile bacterial population with the immersion period. Use of 500 ppm palash (Butea monosperma) leaf extract (PLE) reduced the average corrosion rate to 0.002 mmpy. SEM analysis showed a very thin external film formation in the presence of the inhibitor. The X-ray photoelectron spectroscopy studies confirmed the presence of corrosion products such as Fe2O3 and FeS. The gas chromatography-mass spectrometry studies showed the dominant percentage of various terpenoids along with vitamin E as the main components of the PLE. Electrochemical analysis showed the existence of a diffusion barrier. The resistance offered by the diffusion barrier is high in the inhibited sample when compared to uninhibited samples.
{"title":"Investigating inhibition characteristics of Butea monosperma leaf extracts to retard stainless steel biocorrosion in the presence of sulfate-reducing bacteria","authors":"Shiv Manu, N. Selvam, Manivannan Ramachandran","doi":"10.2298/jsc221230026m","DOIUrl":"https://doi.org/10.2298/jsc221230026m","url":null,"abstract":"The influence of sulfate-reducing bacteria Desulfovibrio desulfuricans on stainless steel SS 202 corrosion in neutral media was studied in detail using weight loss and electrochemical routes. The bacterial activity resulted in material loss with an average rate of 0.015 mmpy. The scanning electron microscopy (SEM) analysis showed a significant increase in the sessile bacterial population with the immersion period. Use of 500 ppm palash (Butea monosperma) leaf extract (PLE) reduced the average corrosion rate to 0.002 mmpy. SEM analysis showed a very thin external film formation in the presence of the inhibitor. The X-ray photoelectron spectroscopy studies confirmed the presence of corrosion products such as Fe2O3 and FeS. The gas chromatography-mass spectrometry studies showed the dominant percentage of various terpenoids along with vitamin E as the main components of the PLE. Electrochemical analysis showed the existence of a diffusion barrier. The resistance offered by the diffusion barrier is high in the inhibited sample when compared to uninhibited samples.","PeriodicalId":17489,"journal":{"name":"Journal of The Serbian Chemical Society","volume":"1 1","pages":""},"PeriodicalIF":1.0,"publicationDate":"2023-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"68516168","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"化学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
M. Simic, J. Kotur-Stevuljević, Predrag Jovanovic, Milos Petkovic, M. Jovanovic, G. Tasic, V. Savić
Disruption of the redox balance in the body causes oxidative stress that can initiate many diseases. While antioxidants reduce the level of oxidizing compounds in the medium, prooxidants promote the opposite process and were used in therapies in particular those of cancer diseases. In this study, a series of azolyl lactones, were tested in human serum as a biological matrix and the obtained values of their oxy scores (OS) were compared. The antioxidative properties of these compounds were also tested under conditions of induced oxidative stress using an external prooxidant, t-butylhydroperoxide. The results showed that the sulphur analogue 4-azolyl coumarin 5 has the best antioxidant properties (OS -2.2), while the halogenated derivatives of pyrazolylcoumarin 7 and 8 act as prooxidant, but successfully resist oxidative stress (OS 2.7 and 2.0). Related phthalides and isocoumarins showed prooxidative properties, but azolyl isocoumarins 10 and 11 show the strongest resistance to oxidative stress, reflected in their negative oxy score value (OS -2.1 and OS -1.1). The results demonstrated that combining two pharmacophores with known redox properties can produce potent compounds in both directions, with the antioxidative and the prooxidative characteristics.
{"title":"In vitro study of redox properties of azolyl-lactones in human serum","authors":"M. Simic, J. Kotur-Stevuljević, Predrag Jovanovic, Milos Petkovic, M. Jovanovic, G. Tasic, V. Savić","doi":"10.2298/jsc221221017s","DOIUrl":"https://doi.org/10.2298/jsc221221017s","url":null,"abstract":"Disruption of the redox balance in the body causes oxidative stress that can initiate many diseases. While antioxidants reduce the level of oxidizing compounds in the medium, prooxidants promote the opposite process and were used in therapies in particular those of cancer diseases. In this study, a series of azolyl lactones, were tested in human serum as a biological matrix and the obtained values of their oxy scores (OS) were compared. The antioxidative properties of these compounds were also tested under conditions of induced oxidative stress using an external prooxidant, t-butylhydroperoxide. The results showed that the sulphur analogue 4-azolyl coumarin 5 has the best antioxidant properties (OS -2.2), while the halogenated derivatives of pyrazolylcoumarin 7 and 8 act as prooxidant, but successfully resist oxidative stress (OS 2.7 and 2.0). Related phthalides and isocoumarins showed prooxidative properties, but azolyl isocoumarins 10 and 11 show the strongest resistance to oxidative stress, reflected in their negative oxy score value (OS -2.1 and OS -1.1). The results demonstrated that combining two pharmacophores with known redox properties can produce potent compounds in both directions, with the antioxidative and the prooxidative characteristics.","PeriodicalId":17489,"journal":{"name":"Journal of The Serbian Chemical Society","volume":"54 1","pages":""},"PeriodicalIF":1.0,"publicationDate":"2023-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"68516176","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"化学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
A. Lazic, Aleksandra Mašulović, Jelena Ladjarevic, Nataša Valentić
A convenient and efficient approach toward the synthesis of seven aromatically substituted xanthendiones (1?7) and one structurally-related xanthenone (8) through condensation of dimedone and the appropriate aromatic aldehyde is reported. Further, their chemical structure was confirmed by melting points, elemental analysis, FT-IR, 1H, 13C NMR and UV-Vis spectroscopic methods. The relationship between the chemical structure and pharmacological activity was determined empirically using appropriate software packages and in vitro using the ABTS (2,2'-azinobis-(3-ethylbenzothiazoline-6-sulfonic acid) method. The results of in silico prediction suggested that all investigated compounds possess good oral bioavailability. The results of the ABTS assay indicate that five compounds possess the ability to scavenge the ABTS?+ radical cation. Based on the comparison of the IC50 values, the activity of the compounds was found to be as follows: 6 > 1 > 7 > 2 > 8. The effects of solvent dipolarity/polarizability and solute solvent-hydrogen-bonding interactions on the shifts of the absorption maxima were rationalized by means of the linear solvation energy relationship concepts proposed by Kamlet-Taft and Catal?n.
{"title":"Assessing the pharmacological potential of selected xanthene derivatives","authors":"A. Lazic, Aleksandra Mašulović, Jelena Ladjarevic, Nataša Valentić","doi":"10.2298/jsc230131035l","DOIUrl":"https://doi.org/10.2298/jsc230131035l","url":null,"abstract":"A convenient and efficient approach toward the synthesis of seven aromatically substituted xanthendiones (1?7) and one structurally-related xanthenone (8) through condensation of dimedone and the appropriate aromatic aldehyde is reported. Further, their chemical structure was confirmed by melting points, elemental analysis, FT-IR, 1H, 13C NMR and UV-Vis spectroscopic methods. The relationship between the chemical structure and pharmacological activity was determined empirically using appropriate software packages and in vitro using the ABTS (2,2'-azinobis-(3-ethylbenzothiazoline-6-sulfonic acid) method. The results of in silico prediction suggested that all investigated compounds possess good oral bioavailability. The results of the ABTS assay indicate that five compounds possess the ability to scavenge the ABTS?+ radical cation. Based on the comparison of the IC50 values, the activity of the compounds was found to be as follows: 6 > 1 > 7 > 2 > 8. The effects of solvent dipolarity/polarizability and solute solvent-hydrogen-bonding interactions on the shifts of the absorption maxima were rationalized by means of the linear solvation energy relationship concepts proposed by Kamlet-Taft and Catal?n.","PeriodicalId":17489,"journal":{"name":"Journal of The Serbian Chemical Society","volume":"1 1","pages":""},"PeriodicalIF":1.0,"publicationDate":"2023-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"68516777","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"化学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
G. Andrejic, M. Kovacevic, Ž. Dželetović, Uros Aleksic, Isidor Grdovic, T. Rakić
Decades of mining activity have resulted in the accumulation of significant amounts of tailings that are deposited over the natural vegetation, forming deposits tens of meters thick. The tailings are poor in organic matter and macronutrients and contain a high concentration of potentially toxic elements (PTE). Their surface remains unvegetated for long periods of time and is susceptible to fluvial and wind erosion. Equisetum arvense and E. telmateia appear to be the first colonizers in the tailings of the Pb-Cu-Zn mine in Serbia. Each plant was sampled along with its associated substrate. Pseudototal and available metals in the substrate, as well as total As, Cd, Cu, Fe, Mn, Ni, Pb and Zn concentrations in the plant parts were determined by atomic absorption spectrophotometry. The findings show that both species have high bioaccumulation capacity and tolerance to otherwise toxic concentrations due to efficient accumulation, immobilization, and detoxification of these elements in their underground parts. It is expected that the long-term presence of metal-tolerant horsetail species would increase the organic matter content of flotation residues, thus gradually improving their physical, chemical, and biological properties. This, in turn, would promote the natural succession of other metal-tolerant plant species and soil microorganisms.
{"title":"Potentially toxic element accumulation in two Equisetum species spontaneously grown in the flotation tailings","authors":"G. Andrejic, M. Kovacevic, Ž. Dželetović, Uros Aleksic, Isidor Grdovic, T. Rakić","doi":"10.2298/jsc230113028a","DOIUrl":"https://doi.org/10.2298/jsc230113028a","url":null,"abstract":"Decades of mining activity have resulted in the accumulation of significant amounts of tailings that are deposited over the natural vegetation, forming deposits tens of meters thick. The tailings are poor in organic matter and macronutrients and contain a high concentration of potentially toxic elements (PTE). Their surface remains unvegetated for long periods of time and is susceptible to fluvial and wind erosion. Equisetum arvense and E. telmateia appear to be the first colonizers in the tailings of the Pb-Cu-Zn mine in Serbia. Each plant was sampled along with its associated substrate. Pseudototal and available metals in the substrate, as well as total As, Cd, Cu, Fe, Mn, Ni, Pb and Zn concentrations in the plant parts were determined by atomic absorption spectrophotometry. The findings show that both species have high bioaccumulation capacity and tolerance to otherwise toxic concentrations due to efficient accumulation, immobilization, and detoxification of these elements in their underground parts. It is expected that the long-term presence of metal-tolerant horsetail species would increase the organic matter content of flotation residues, thus gradually improving their physical, chemical, and biological properties. This, in turn, would promote the natural succession of other metal-tolerant plant species and soil microorganisms.","PeriodicalId":17489,"journal":{"name":"Journal of The Serbian Chemical Society","volume":"1 1","pages":""},"PeriodicalIF":1.0,"publicationDate":"2023-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"68516789","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"化学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Rahmiana Zein, Hamdhan Fathony, Putri Ramadhani, D Deswati
This study discusses kapok husk (KH) activated by HNO3 as a biosorbent for methylene blue dye and analyzes its adsorption ability. The adsorption capacity of KH is 330.161 mg g-1 with optimum conditions at pH 9, concentration 5500 mg L-1, contact time 15 minutes, and biosorbent temperature 25 ?C. The isotherm study followed the Langmuir isotherm model, as seen from the R2 value of 0.9993 and maximum adsorption capacity of 312.5 mg g-1, which indicated a monolayer layer in the adsorption process. The kinetic data show that KH followed the pseudo-second-order model. The results of the TGA analysis show that thermal stability affects the performance of biosorbents in the adsorption process. FTIR and SEM-EDS characterization results showed that electrostatic interactions, cation exchange, and pore filling regulate the methylene blue dye adsorption mechanism on the surface of the KH. The reusability of KH through adsorption-desorption cycle analysis was achieved five times. This indicates that the biosorbent can be economically feasible for real wastewater treatment based on its good reusability and simple preparation and activation.
{"title":"Facile chemically activation process of kapok husk as a low-cost biosorbent for removal methylene blue dye in aqueous solution","authors":"Rahmiana Zein, Hamdhan Fathony, Putri Ramadhani, D Deswati","doi":"10.2298/jsc230303084z","DOIUrl":"https://doi.org/10.2298/jsc230303084z","url":null,"abstract":"This study discusses kapok husk (KH) activated by HNO3 as a biosorbent for methylene blue dye and analyzes its adsorption ability. The adsorption capacity of KH is 330.161 mg g-1 with optimum conditions at pH 9, concentration 5500 mg L-1, contact time 15 minutes, and biosorbent temperature 25 ?C. The isotherm study followed the Langmuir isotherm model, as seen from the R2 value of 0.9993 and maximum adsorption capacity of 312.5 mg g-1, which indicated a monolayer layer in the adsorption process. The kinetic data show that KH followed the pseudo-second-order model. The results of the TGA analysis show that thermal stability affects the performance of biosorbents in the adsorption process. FTIR and SEM-EDS characterization results showed that electrostatic interactions, cation exchange, and pore filling regulate the methylene blue dye adsorption mechanism on the surface of the KH. The reusability of KH through adsorption-desorption cycle analysis was achieved five times. This indicates that the biosorbent can be economically feasible for real wastewater treatment based on its good reusability and simple preparation and activation.","PeriodicalId":17489,"journal":{"name":"Journal of The Serbian Chemical Society","volume":"82 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2023-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"134888981","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"化学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
The solvatochromic properties of methylene blue (MB) were investigated in neat water, methanol, ethanol, propanol, dioxane, and their corresponding aqueous mixtures. The correlation of the empirical solvent polarity scale (ET) values of MB with solvent composition was analyzed using the solvent exchange model of Bosch and Roses to explain the preferential solvation of the probe thiazine dye in the binary mixed solvents. Non-linear solvatochromism of MB was observed in aqueous mixtures of methanol, ethanol, propanol, and dioxane. The influence of the composition of the solvating shell in preferential solvation of the solute dye was investigated in terms of both solvent-solvent and solute-solvent interactions, and the local mole fraction of each solvent composition in the cybotactic region of the probe was also calculated. Effective mole fraction variation can provide important physicochemical insights into the microscopic and molecular interactions between MB species and solvent components. The results showed that the MB solvation shell was thoroughly saturated with the solvent complex S12 for dioxane more than ethanol and propanol mixtures, and opposite trends for methanol mixtures, whereas the solvent complex S12 could not incorporate into the MB solvation shell. Data from the binary systems were analyzed with KAT parameters using a dual model of basicity and polarity. The results showed that the polarity was better suited for spectral shift in aqueous methanol and ethanol solutions, while the basicity was better for aqueous propanol and dioxane solutions.
{"title":"The non-ideality in binary aqueous systems contributed to the different abilities of solvent entities incorporated in the solvation shell of methylene blue","authors":"Sokaina Hemdan, Radwan Alnajjar","doi":"10.2298/jsc230512087h","DOIUrl":"https://doi.org/10.2298/jsc230512087h","url":null,"abstract":"The solvatochromic properties of methylene blue (MB) were investigated in neat water, methanol, ethanol, propanol, dioxane, and their corresponding aqueous mixtures. The correlation of the empirical solvent polarity scale (ET) values of MB with solvent composition was analyzed using the solvent exchange model of Bosch and Roses to explain the preferential solvation of the probe thiazine dye in the binary mixed solvents. Non-linear solvatochromism of MB was observed in aqueous mixtures of methanol, ethanol, propanol, and dioxane. The influence of the composition of the solvating shell in preferential solvation of the solute dye was investigated in terms of both solvent-solvent and solute-solvent interactions, and the local mole fraction of each solvent composition in the cybotactic region of the probe was also calculated. Effective mole fraction variation can provide important physicochemical insights into the microscopic and molecular interactions between MB species and solvent components. The results showed that the MB solvation shell was thoroughly saturated with the solvent complex S12 for dioxane more than ethanol and propanol mixtures, and opposite trends for methanol mixtures, whereas the solvent complex S12 could not incorporate into the MB solvation shell. Data from the binary systems were analyzed with KAT parameters using a dual model of basicity and polarity. The results showed that the polarity was better suited for spectral shift in aqueous methanol and ethanol solutions, while the basicity was better for aqueous propanol and dioxane solutions.","PeriodicalId":17489,"journal":{"name":"Journal of The Serbian Chemical Society","volume":"27 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2023-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"135448920","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"化学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
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