Pub Date : 2022-01-01DOI: 10.2298/hemind220527016t
Z. Todorović, Biljana Djordevic, Dragan Z. Troter, Ljiljana Veselinović, M. Zdujić, V. Veljković
Deep eutectic solvents (DESs) are called 'designer solvents' due to various structural variations and the benefit of tailoring their physicochemical properties. For industrial applications of DESs it is crucial to know their physical and thermodynamic properties such as density, viscosity, and refractive index. These properties were measured for three lecithin (LEC)-based DESs with glycerol (G), triethanolamine (TEOA), and oleic acid (OLA) as functions of temperature. The viscosity was fitted by both Arrhenius-type and Vogel-Tamman-Fulcher equations. The density, viscosity, and refractive index of tested DESs decreased with the increase in temperature. The LEC:G DES exhibited the lowest density at all tested temperatures. This DES was selected as a cosolvent in the ethanolysis of cold-pressed black mustard (Brassica nigra L.) seed oil catalyzed by either calcined or non-calcined CaO. The reaction was carried out in a batch stirred reactor under the following conditions: the temperature of 70?C, the ethanol-to-oil molar ratio of 12:1, and the amount of DES and CaO of 20 and 10 wt.% (to oil), respectively. The presence of DES accelerated the reaction, while the separation of the final reaction mixture phases was faster.
{"title":"Effects of temperature on physicochemical properties of the lecithin based deep eutectic solvents and their use in the CaO-catalyzed transesterification","authors":"Z. Todorović, Biljana Djordevic, Dragan Z. Troter, Ljiljana Veselinović, M. Zdujić, V. Veljković","doi":"10.2298/hemind220527016t","DOIUrl":"https://doi.org/10.2298/hemind220527016t","url":null,"abstract":"Deep eutectic solvents (DESs) are called 'designer solvents' due to various structural variations and the benefit of tailoring their physicochemical properties. For industrial applications of DESs it is crucial to know their physical and thermodynamic properties such as density, viscosity, and refractive index. These properties were measured for three lecithin (LEC)-based DESs with glycerol (G), triethanolamine (TEOA), and oleic acid (OLA) as functions of temperature. The viscosity was fitted by both Arrhenius-type and Vogel-Tamman-Fulcher equations. The density, viscosity, and refractive index of tested DESs decreased with the increase in temperature. The LEC:G DES exhibited the lowest density at all tested temperatures. This DES was selected as a cosolvent in the ethanolysis of cold-pressed black mustard (Brassica nigra L.) seed oil catalyzed by either calcined or non-calcined CaO. The reaction was carried out in a batch stirred reactor under the following conditions: the temperature of 70?C, the ethanol-to-oil molar ratio of 12:1, and the amount of DES and CaO of 20 and 10 wt.% (to oil), respectively. The presence of DES accelerated the reaction, while the separation of the final reaction mixture phases was faster.","PeriodicalId":9933,"journal":{"name":"Chemical Industry","volume":"6 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2022-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"88932347","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2022-01-01DOI: 10.2298/hemind210509004g
Ana Gledovic, D. Bajuk-Bogdanović, S. Uskoković-Marković, Leposava Pavun, S. Savić, Aleksandra Janošević-Ležaić
In this study several essential oils (EOs): basil - BA, lemon balm - LB and oregano - OR were incorporated into nanoemulsions (NEs) as prospective carriers for natural and sensitive bioactives. NEs were prepared via the phase inversion composition (PIC) method, which is an energy-efficient cold process. Physicochemical stability of NEs was confirmed by particle size distribution analysis, electrical conductivity and pH value measurements, as well as by optical microscopy observations. The type of EO and the surfactant and oil mix concentration were found to be crucial factors governing the NE properties and stability. Raman spectra of the EOs confirmed main active ingredients and provided detection of interactions with the nanocarrier, which is a novel application of this technique. The antioxidant activity towards DPPH radical in methanol was concentration-dependent with a similar trend for individual oils and oil-loaded NEs (OR> LB> BA). However, the ABTS test in an aqueous medium revealed notable change in the order of activity after EO nanonisation at higher EO concentrations. Overall, it was found that OR-NE was the most effective and stable system, since OR acted as a co-stabiliser in the NE formulation, and its remarkably high antioxidant activity was successfully preserved during 6 months of storage.
{"title":"Low energy nanoemulsions as carriers for essential oils in topical formulations for antioxidant skin protection","authors":"Ana Gledovic, D. Bajuk-Bogdanović, S. Uskoković-Marković, Leposava Pavun, S. Savić, Aleksandra Janošević-Ležaić","doi":"10.2298/hemind210509004g","DOIUrl":"https://doi.org/10.2298/hemind210509004g","url":null,"abstract":"In this study several essential oils (EOs): basil - BA, lemon balm - LB and oregano - OR were incorporated into nanoemulsions (NEs) as prospective carriers for natural and sensitive bioactives. NEs were prepared via the phase inversion composition (PIC) method, which is an energy-efficient cold process. Physicochemical stability of NEs was confirmed by particle size distribution analysis, electrical conductivity and pH value measurements, as well as by optical microscopy observations. The type of EO and the surfactant and oil mix concentration were found to be crucial factors governing the NE properties and stability. Raman spectra of the EOs confirmed main active ingredients and provided detection of interactions with the nanocarrier, which is a novel application of this technique. The antioxidant activity towards DPPH radical in methanol was concentration-dependent with a similar trend for individual oils and oil-loaded NEs (OR> LB> BA). However, the ABTS test in an aqueous medium revealed notable change in the order of activity after EO nanonisation at higher EO concentrations. Overall, it was found that OR-NE was the most effective and stable system, since OR acted as a co-stabiliser in the NE formulation, and its remarkably high antioxidant activity was successfully preserved during 6 months of storage.","PeriodicalId":9933,"journal":{"name":"Chemical Industry","volume":"42 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2022-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"90750163","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2022-01-01DOI: 10.2298/hemind211223007o
G. Ostojic, D. Lazić, Saša Zeljković
In this paper, the ICP-OES method (induced coupled plasma optical emission spectrometry) was used to determine the content of silicon dioxide in bauxite, as an important impurity that affects the quality and application of bauxite in alumina production by the Bayer process. Twenty bauxite samples from seven different deposits were analysed. The results were compared with the reference spectrophotometric UV-VIS method. The mean relative difference between the silicon dioxide content determined by the ICP-OES method and the reference method is found to be 4.88 %. Statistical tests were used to assess the comparability of the two methods, followed by a scatter plot, the Bland Altman, Passing-Bablok, and the "Mountain" plot. Graphical comparisons generally do not show statistically significant differences between methods. The accuracy and precision of the ICP-OES method were verified by using the standard reference material SRM NIST 697, Dominican Bauxite. Recovery and repeatability values, expressed as relative standard deviation (RSD), are within the acceptance criteria. Based on the t-test, there is a statistically significant difference between the mean value of ICP-OES measurements and the certified value of silicon dioxide, which can be attributed to the effect of systematic error of ICP-OES analysis.
{"title":"Determination of silicon dioxide content in bauxite: Comparing the ICP-OES method with the UV-VIS method","authors":"G. Ostojic, D. Lazić, Saša Zeljković","doi":"10.2298/hemind211223007o","DOIUrl":"https://doi.org/10.2298/hemind211223007o","url":null,"abstract":"In this paper, the ICP-OES method (induced coupled plasma optical emission spectrometry) was used to determine the content of silicon dioxide in bauxite, as an important impurity that affects the quality and application of bauxite in alumina production by the Bayer process. Twenty bauxite samples from seven different deposits were analysed. The results were compared with the reference spectrophotometric UV-VIS method. The mean relative difference between the silicon dioxide content determined by the ICP-OES method and the reference method is found to be 4.88 %. Statistical tests were used to assess the comparability of the two methods, followed by a scatter plot, the Bland Altman, Passing-Bablok, and the \"Mountain\" plot. Graphical comparisons generally do not show statistically significant differences between methods. The accuracy and precision of the ICP-OES method were verified by using the standard reference material SRM NIST 697, Dominican Bauxite. Recovery and repeatability values, expressed as relative standard deviation (RSD), are within the acceptance criteria. Based on the t-test, there is a statistically significant difference between the mean value of ICP-OES measurements and the certified value of silicon dioxide, which can be attributed to the effect of systematic error of ICP-OES analysis.","PeriodicalId":9933,"journal":{"name":"Chemical Industry","volume":"191 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2022-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"72751877","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2022-01-01DOI: 10.2298/hemind220406006d
Aleksandar Dekanski
Samo stampana verzija. Dostupno na web stranici casipisa: http://www.ache.org.rs/HI/ Autor se izvinjava za gresku i sve eventualne nedoumice i neprijatnosti koje su time izazvane. The author would like to apologize for the oversight and any inconvenience it may have caused.
{"title":"Corrigendum u clanku: Izazovi i dileme elektrohemijske konverzije i skladistenja energije, Hem. Ind. 76 (1) 43-54 (2022), https://doi.org/10.2298/HEMIND220201002D","authors":"Aleksandar Dekanski","doi":"10.2298/hemind220406006d","DOIUrl":"https://doi.org/10.2298/hemind220406006d","url":null,"abstract":"Samo stampana verzija. Dostupno na web stranici casipisa: http://www.ache.org.rs/HI/ Autor se izvinjava za gresku i sve eventualne nedoumice i neprijatnosti koje su time izazvane. The author would like to apologize for the oversight and any inconvenience it may have caused.","PeriodicalId":9933,"journal":{"name":"Chemical Industry","volume":"51 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2022-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"89479515","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2022-01-01DOI: 10.2298/hemind220816018d
Stefan Dikic, D. Glišić, Abdunaser Fadel, G. Jovanović, N. Radović
The aim of this work was to establish a temperature of finish rolling stage of Nb/Ti microalloyed steel containing 0.06 wt.% C, 0.77 wt.% Mn, 0.039 wt.% Nb and 0.015 wt.% Ti, using physical simulation. Samples were subjected to laboratory simulation at a twist plastometer at high temperatures, i.e. between 825 and 950?C. Five pass deformation and interpass times were selected in accordance with a processing parameters at five stand finishing hot strip mill. Restoration (recovery and/or recrystallization) behavior was evaluated by calculation of Fraction Softening (FS) and Area Softening Parameter (ASP) values. At 950?C all individual pass stress-strain curves, FS and ASP show full recrystallization in all interpass intervals. On the other hand, with a decrease in temperature to the interval of 875-825?C, the extent of restoration is decreasing, leading to recovery as a sole softening mechanism at 825?C, which was confirmed by the stress-strain curve shape, and values of FS and ASP. It is assumed that, due to high supersaturation, strain-induced precipitation promoted pinning of grain and subgrain boundaries and suppressed recrystallization. Therefore, the critical temperature for finish rolling was estimated to be 825?C.
{"title":"Physical simulation of finish rolling of microalloyed steels in isothermal conditions","authors":"Stefan Dikic, D. Glišić, Abdunaser Fadel, G. Jovanović, N. Radović","doi":"10.2298/hemind220816018d","DOIUrl":"https://doi.org/10.2298/hemind220816018d","url":null,"abstract":"The aim of this work was to establish a temperature of finish rolling stage of Nb/Ti microalloyed steel containing 0.06 wt.% C, 0.77 wt.% Mn, 0.039 wt.% Nb and 0.015 wt.% Ti, using physical simulation. Samples were subjected to laboratory simulation at a twist plastometer at high temperatures, i.e. between 825 and 950?C. Five pass deformation and interpass times were selected in accordance with a processing parameters at five stand finishing hot strip mill. Restoration (recovery and/or recrystallization) behavior was evaluated by calculation of Fraction Softening (FS) and Area Softening Parameter (ASP) values. At 950?C all individual pass stress-strain curves, FS and ASP show full recrystallization in all interpass intervals. On the other hand, with a decrease in temperature to the interval of 875-825?C, the extent of restoration is decreasing, leading to recovery as a sole softening mechanism at 825?C, which was confirmed by the stress-strain curve shape, and values of FS and ASP. It is assumed that, due to high supersaturation, strain-induced precipitation promoted pinning of grain and subgrain boundaries and suppressed recrystallization. Therefore, the critical temperature for finish rolling was estimated to be 825?C.","PeriodicalId":9933,"journal":{"name":"Chemical Industry","volume":"10 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2022-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"89792047","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2022-01-01DOI: 10.2298/hemind211125009m
Marija Miladinovic, Milica Petkovic, Ivana Bankovic-Ilic, S. Konstantinović, V. Veljković
Oil methanolysis over modified CaO catalysts was studied to assess the catalytic performance and to define an appropriate kinetic model. CaO was modified by commercial glycerol and a deep eutectic solvent (DES), choline chloride : glycerol (ChCl : Gly), to obtain catalytically active complexes of CaO and glycerol. The main goal was to investigate the effect of the obtained complexes on the reaction rate and fatty acid methyl ester (FAME) content and to describe the variation of the triacylglycerol (TAG) conversion degree during the reaction time. Fourier transform infrared spectroscopy (FTIR) was applied to confirm the formation of CaO complexes with glycerol or the glycerol-based DES. Different catalyst loadings (0.5, 1, and 5 % of oil weight) and methanol-to-oil molar ratios (6 : 1 and 12 : 1) were applied for investigation of the sunflower oil methanolysis at 60 oC. Two kinetic models were employed yielding the kinetic parameters, which depended on the catalyst loading and the methanol-to-oil molar ratio. Both models showed valid applicability for describing the kinetics of the reactions catalyzed by both complexes (the mean relative percent deviation was lower than 10 %).
{"title":"Sunflower oil methanolysis over modified CaO catalysts","authors":"Marija Miladinovic, Milica Petkovic, Ivana Bankovic-Ilic, S. Konstantinović, V. Veljković","doi":"10.2298/hemind211125009m","DOIUrl":"https://doi.org/10.2298/hemind211125009m","url":null,"abstract":"Oil methanolysis over modified CaO catalysts was studied to assess the catalytic performance and to define an appropriate kinetic model. CaO was modified by commercial glycerol and a deep eutectic solvent (DES), choline chloride : glycerol (ChCl : Gly), to obtain catalytically active complexes of CaO and glycerol. The main goal was to investigate the effect of the obtained complexes on the reaction rate and fatty acid methyl ester (FAME) content and to describe the variation of the triacylglycerol (TAG) conversion degree during the reaction time. Fourier transform infrared spectroscopy (FTIR) was applied to confirm the formation of CaO complexes with glycerol or the glycerol-based DES. Different catalyst loadings (0.5, 1, and 5 % of oil weight) and methanol-to-oil molar ratios (6 : 1 and 12 : 1) were applied for investigation of the sunflower oil methanolysis at 60 oC. Two kinetic models were employed yielding the kinetic parameters, which depended on the catalyst loading and the methanol-to-oil molar ratio. Both models showed valid applicability for describing the kinetics of the reactions catalyzed by both complexes (the mean relative percent deviation was lower than 10 %).","PeriodicalId":9933,"journal":{"name":"Chemical Industry","volume":"52 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2022-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"91351226","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2022-01-01DOI: 10.2298/hemind221204020g
E. A. Gladkov, O. Gladkova
Urban sciences can be divided into three directions: Natural, Humanities and Engineering. Within the fields of urban natural and urban engineering (technical) sciences, chemical and chemico-biological research take an important place. We propose using the new term "urban chemistry" (i.e. chemistry of the urban environment) focusing on the chemical aspects of the atmosphere, water bodies, and soil of cities. Urban chemistry is interconnected with urban ecology, toxicology and urban biology, and among the biological disciplines, it is particularly related to urban botany. Urban chemistry can be seen as a separate direction of urban natural sciences, which will significantly contribute to sustainable development of cities.
{"title":"Urban chemistry as a new discipline exploring chemical and chemico-biological aspects of urban environment","authors":"E. A. Gladkov, O. Gladkova","doi":"10.2298/hemind221204020g","DOIUrl":"https://doi.org/10.2298/hemind221204020g","url":null,"abstract":"Urban sciences can be divided into three directions: Natural, Humanities and Engineering. Within the fields of urban natural and urban engineering (technical) sciences, chemical and chemico-biological research take an important place. We propose using the new term \"urban chemistry\" (i.e. chemistry of the urban environment) focusing on the chemical aspects of the atmosphere, water bodies, and soil of cities. Urban chemistry is interconnected with urban ecology, toxicology and urban biology, and among the biological disciplines, it is particularly related to urban botany. Urban chemistry can be seen as a separate direction of urban natural sciences, which will significantly contribute to sustainable development of cities.","PeriodicalId":9933,"journal":{"name":"Chemical Industry","volume":"41 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2022-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"87531810","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2022-01-01DOI: 10.2298/hemind220211011j
V. Jovanović, D. Nišić, V. Milisavljevic, D. Todorović, D. Radulovic, Branislav Ivošević, Sonja Milićević
This paper presents the results of experiments performed to determine how the quantity of the binder (bentonite) and the parameters of the laboratory roll press affect the quality of the briquettes obtained from limestone powder. These experiments aim to examine the conditions in which limestone briquettes are formed and to determine their use for agricultural purposes. During the experiments various mass fractions of bentonite was added to limestone (from 1 to 10 %), while the force of roll press drums ranged from 2 to 25 kN. The briquettes have been tested by applying scanning electron microscopy (SEM), differential thermal and thermo-gravimetric (DTA/TG) analyses, X-ray diffraction (XRD) and Fourier-transform infrared spectroscopy (FTIR). Bentonite distribution was found to be uniform within the compact briquette structure. Formation of new compounds was not evidenced. The experiments also demonstrated that during briquetting, limestone properties remain unchanged, the changes are only physical, water solubility is not reduced, mechanical properties (impact resistance, compressive strength and abrasion resistance) are satisfactory by the transport and storage terms if the binder mass fraction is over 5% and the briquetting force exceeds 10kN and finally there is no loss due to wind dispersal during application. The only downside of the ?green? briquettes obtained is the time required for their complete disintegration if totally immersed in water.
{"title":"Effects of production conditions on the properties of limestone briquettes aimed for acid soil liming","authors":"V. Jovanović, D. Nišić, V. Milisavljevic, D. Todorović, D. Radulovic, Branislav Ivošević, Sonja Milićević","doi":"10.2298/hemind220211011j","DOIUrl":"https://doi.org/10.2298/hemind220211011j","url":null,"abstract":"This paper presents the results of experiments performed to determine how the quantity of the binder (bentonite) and the parameters of the laboratory roll press affect the quality of the briquettes obtained from limestone powder. These experiments aim to examine the conditions in which limestone briquettes are formed and to determine their use for agricultural purposes. During the experiments various mass fractions of bentonite was added to limestone (from 1 to 10 %), while the force of roll press drums ranged from 2 to 25 kN. The briquettes have been tested by applying scanning electron microscopy (SEM), differential thermal and thermo-gravimetric (DTA/TG) analyses, X-ray diffraction (XRD) and Fourier-transform infrared spectroscopy (FTIR). Bentonite distribution was found to be uniform within the compact briquette structure. Formation of new compounds was not evidenced. The experiments also demonstrated that during briquetting, limestone properties remain unchanged, the changes are only physical, water solubility is not reduced, mechanical properties (impact resistance, compressive strength and abrasion resistance) are satisfactory by the transport and storage terms if the binder mass fraction is over 5% and the briquetting force exceeds 10kN and finally there is no loss due to wind dispersal during application. The only downside of the ?green? briquettes obtained is the time required for their complete disintegration if totally immersed in water.","PeriodicalId":9933,"journal":{"name":"Chemical Industry","volume":"99 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2022-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"89219021","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2021-10-01DOI: 10.2298/hemind210427023k
Aleksandra Kulic-Mandic, M. Bečelić-Tomin, Gordana Pucar-Milidrag, M. Rašeta, Djurdja Kerkez
Waste soybean hulls (WSH) were investigated as a Fe-support in two forms: raw and carbonized (i.e. biocarbon, BC), as possible value-added materials. Fe-impregnation was implemented in order to produce heterogeneous Fenton catalysts for Reactive Blue 4 dye degradation. Materials characterization demonstrated a rise in the specific surface area due to decomposition of WSH constituents during carbonization (to obtain BC) and thermal activation (to obtain Fe-WSH and Fe-BC), thus producing catalysts with high mesoporosity and hematite as the active site for Fenton reaction. Among the investigated materials, Fe-WSH showed the greatest ability for ?OH production in acidic medium. Next, the heterogeneous Fenton process was optimized by using response surface methodology, which resulted in selection of the following reaction conditions: 3 mM H2O2, 100 mg Fe-WSH, reaction time of 180 min, at a constant pH 3, RB4 concentration of 50 mg dm-3 and at room temperature. The achieved dye removal and mineralization were 85.7 and 66.8 %, respectively, while the catalyst showed high stability and the reaction intermediates formed during the oxidation process had a low inhibitory effect on Vibrio fischeri bacteria.
{"title":"Application of impregnated biocarbon produced from soybean hulls in dye decolorization","authors":"Aleksandra Kulic-Mandic, M. Bečelić-Tomin, Gordana Pucar-Milidrag, M. Rašeta, Djurdja Kerkez","doi":"10.2298/hemind210427023k","DOIUrl":"https://doi.org/10.2298/hemind210427023k","url":null,"abstract":"Waste soybean hulls (WSH) were investigated as a Fe-support in two forms: raw\u0000 and carbonized (i.e. biocarbon, BC), as possible value-added materials.\u0000 Fe-impregnation was implemented in order to produce heterogeneous Fenton\u0000 catalysts for Reactive Blue 4 dye degradation. Materials characterization\u0000 demonstrated a rise in the specific surface area due to decomposition of WSH\u0000 constituents during carbonization (to obtain BC) and thermal activation (to\u0000 obtain Fe-WSH and Fe-BC), thus producing catalysts with high mesoporosity\u0000 and hematite as the active site for Fenton reaction. Among the investigated\u0000 materials, Fe-WSH showed the greatest ability for ?OH production in acidic\u0000 medium. Next, the heterogeneous Fenton process was optimized by using\u0000 response surface methodology, which resulted in selection of the following\u0000 reaction conditions: 3 mM H2O2, 100 mg Fe-WSH, reaction time of 180 min, at\u0000 a constant pH 3, RB4 concentration of 50 mg dm-3 and at room temperature.\u0000 The achieved dye removal and mineralization were 85.7 and 66.8 %,\u0000 respectively, while the catalyst showed high stability and the reaction\u0000 intermediates formed during the oxidation process had a low inhibitory\u0000 effect on Vibrio fischeri bacteria.","PeriodicalId":9933,"journal":{"name":"Chemical Industry","volume":"64 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2021-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"83419543","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2021-09-02DOI: 10.2298/hemind210307024c
A. Chlebnikovas
The main aim of this investigation was an experimental analysis of the air cleaning efficiency in a mock-up next-generation air cleaning device - one-level 8-channel industrial cyclone-separator with quarter-rings - while changing parameters of the inner structure and the assessment of the effects of dispersion of particulate matter. Therefore, the research was carried out in two stages: the first stage covered the analysis of the efficiency of the multi-channel cyclone with particulate matter of <20 and <50 ?m. During the second stage, a cascade impactor was used to measure the particle collection efficiency in the multi-channel cyclone by fractions: PM1, PM2.5 and PM10. Results of the tests with using the cascade impactor were compared to show changes in the PM composition before and after the multi-channel cyclone-separator. According to the obtained experimental data, the one-level 8-channel cyclone-separator collects 70 to 80 % of PM up to 10 ?m in size, 45 to 60 % of PM up to 2.5 ?m in size and 21 to 25 % of PM up to 1 ?m in size.
{"title":"Experimental investigation of a one-level eight-channel cyclone-separator incorporating quarter-rings","authors":"A. Chlebnikovas","doi":"10.2298/hemind210307024c","DOIUrl":"https://doi.org/10.2298/hemind210307024c","url":null,"abstract":"The main aim of this investigation was an experimental analysis of the air\u0000 cleaning efficiency in a mock-up next-generation air cleaning device -\u0000 one-level 8-channel industrial cyclone-separator with quarter-rings - while\u0000 changing parameters of the inner structure and the assessment of the effects\u0000 of dispersion of particulate matter. Therefore, the research was carried out\u0000 in two stages: the first stage covered the analysis of the efficiency of the\u0000 multi-channel cyclone with particulate matter of <20 and <50 ?m. During the\u0000 second stage, a cascade impactor was used to measure the particle collection\u0000 efficiency in the multi-channel cyclone by fractions: PM1, PM2.5 and PM10.\u0000 Results of the tests with using the cascade impactor were compared to show\u0000 changes in the PM composition before and after the multi-channel\u0000 cyclone-separator. According to the obtained experimental data, the\u0000 one-level 8-channel cyclone-separator collects 70 to 80 % of PM up to 10 ?m\u0000 in size, 45 to 60 % of PM up to 2.5 ?m in size and 21 to 25 % of PM up to 1\u0000 ?m in size.","PeriodicalId":9933,"journal":{"name":"Chemical Industry","volume":"4 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2021-09-02","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"90187013","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
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