Pub Date : 2017-07-26DOI: 10.2298/HEMIND160521036V
M. Vasić, M. Randjelović, J. Mitrović, N. Stojković, B. Matović, A. Zarubica
Titania based catalyst and TiO 2 doped with zirconia were prepared by modified sol–gel method. The synthesized catalysts samples were characterized by BET, XRD, SEM and FTIR techniques. Photocatalytic activity was tested in the reaction of crystal violet (CV) dye decolorization/decomposition under UV light irradiation. The effect of several operational parameters, such as catalyst dosage, initial dye concentrations, duration of UV irradiation treatment and number of reaction cycles were also considered. The obtained results indicated faster dye decolorization with the increase of the catalyst amount and a decrease of initial CV concentrations. An influence of doping with zirconia on the physico-chemical properties of bare titania was studied. The doping procedure had affected photocatalytic properties of the final catalytic material, and had improved photocatalytic performances of doped catalyst on crystal violet decolorization/degradation in comparison to bare titania.
{"title":"Decolorization of crystal violet over TiO2 and TiO2 doped with zirconia photocatalysts","authors":"M. Vasić, M. Randjelović, J. Mitrović, N. Stojković, B. Matović, A. Zarubica","doi":"10.2298/HEMIND160521036V","DOIUrl":"https://doi.org/10.2298/HEMIND160521036V","url":null,"abstract":"Titania based catalyst and TiO 2 doped with zirconia were prepared by modified sol–gel method. The synthesized catalysts samples were characterized by BET, XRD, SEM and FTIR techniques. Photocatalytic activity was tested in the reaction of crystal violet (CV) dye decolorization/decomposition under UV light irradiation. The effect of several operational parameters, such as catalyst dosage, initial dye concentrations, duration of UV irradiation treatment and number of reaction cycles were also considered. The obtained results indicated faster dye decolorization with the increase of the catalyst amount and a decrease of initial CV concentrations. An influence of doping with zirconia on the physico-chemical properties of bare titania was studied. The doping procedure had affected photocatalytic properties of the final catalytic material, and had improved photocatalytic performances of doped catalyst on crystal violet decolorization/degradation in comparison to bare titania.","PeriodicalId":12913,"journal":{"name":"Hemijska Industrija","volume":null,"pages":null},"PeriodicalIF":0.9,"publicationDate":"2017-07-26","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.2298/HEMIND160521036V","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"49369034","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2017-07-26DOI: 10.2298/HEMIND160513034G
B. Gligorijevic, M. Vilotijević, M. Šćepanović, Radovan V. Radovanović, N. Radović
The present study estimated the cracking phenomenon in as-plasma-sprayed hydroxylapatite coatings (HACs) after they were being subjected to the severe cutting conditions in the direction perpendicular to the coating/substrate interface. In order to evaluate the effects of substrate preheating on the occurrence of micro-cracks, the HACs were deposited at different initial substrate temperatures ( T S = 20, 100 and 200 °C). The changes in phase composition and HA splat morphology with T S were observed and were correlated with the cracking occurrence. The results showed that severe cutting conditions introduced a localized cracking in the regions of HACs dominantly attributed to the brittle hydroxyl-deficient amorphous calcium phosphate (ACP) phase. This effect was particularly observable in the HACs deposited without preheating of substrate. On the other hand, the preheating of substrate reduced the presence of micro-cracks and caused insignificant changes in the average local phase composition. In HACs deposited with preheating of substrate, the HA splats (of which HACs are composed) were thinner and recrystallized HA regions seemed smaller in size and more evenly distributed. These results implied potentially important roles of the HA splat formation mechanism on the distribution of ACP and recrystallized HA regions in the as-plasma-sprayed HACs and the cracking resistance of HACs.
{"title":"Cracking caused by cutting of plasma-sprayed hydroxyapatite coatings and its relation to the structural features of coatings deposited at different initial substrate temperatures","authors":"B. Gligorijevic, M. Vilotijević, M. Šćepanović, Radovan V. Radovanović, N. Radović","doi":"10.2298/HEMIND160513034G","DOIUrl":"https://doi.org/10.2298/HEMIND160513034G","url":null,"abstract":"The present study estimated the cracking phenomenon in as-plasma-sprayed hydroxylapatite coatings (HACs) after they were being subjected to the severe cutting conditions in the direction perpendicular to the coating/substrate interface. In order to evaluate the effects of substrate preheating on the occurrence of micro-cracks, the HACs were deposited at different initial substrate temperatures ( T S = 20, 100 and 200 °C). The changes in phase composition and HA splat morphology with T S were observed and were correlated with the cracking occurrence. The results showed that severe cutting conditions introduced a localized cracking in the regions of HACs dominantly attributed to the brittle hydroxyl-deficient amorphous calcium phosphate (ACP) phase. This effect was particularly observable in the HACs deposited without preheating of substrate. On the other hand, the preheating of substrate reduced the presence of micro-cracks and caused insignificant changes in the average local phase composition. In HACs deposited with preheating of substrate, the HA splats (of which HACs are composed) were thinner and recrystallized HA regions seemed smaller in size and more evenly distributed. These results implied potentially important roles of the HA splat formation mechanism on the distribution of ACP and recrystallized HA regions in the as-plasma-sprayed HACs and the cracking resistance of HACs.","PeriodicalId":12913,"journal":{"name":"Hemijska Industrija","volume":null,"pages":null},"PeriodicalIF":0.9,"publicationDate":"2017-07-26","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"47260008","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2017-07-26DOI: 10.2298/HEMIND160326028P
Sanja Prodanović, N. Nedic, V. Filipovic, Ljubiša Dubonjić
This paper contains methodology research for forming the control algorithm for a distillation column, modeled as TITO (two-input two-output) process. Its modified form was obtained by connecting the two parts, and this combination hasn't been applied for such a industrial plant, until now. These parts include: a simplified decoupler which was first designed and decentralized PID controller obtained using D-decomposition method for such decoupled process. The decoupler was designed in order to make process become diagonal, and parameters of PID controllers are defined for the two SISO (single-input single-output) processes starting from relation between IE (integral error) criterion and integrator gain, taking into account desired response characteristics deriving from technological requirements of controlled plant. Their connecting provides centralized control. Analysis of the processes responses, obtained by the proposed algorithm and their comparison with the results from the literature, were performed after the completion of the simulations. The proposed approach to the centralized controller design, beside its simplicity of usage and flexibility in achieving diversity of process dynamic behavior, gives better response characteristics, in comparison with existing control algorithms for distillation column in the literature.
{"title":"Modified approach to distillation column control","authors":"Sanja Prodanović, N. Nedic, V. Filipovic, Ljubiša Dubonjić","doi":"10.2298/HEMIND160326028P","DOIUrl":"https://doi.org/10.2298/HEMIND160326028P","url":null,"abstract":"This paper contains methodology research for forming the control algorithm for a distillation column, modeled as TITO (two-input two-output) process. Its modified form was obtained by connecting the two parts, and this combination hasn't been applied for such a industrial plant, until now. These parts include: a simplified decoupler which was first designed and decentralized PID controller obtained using D-decomposition method for such decoupled process. The decoupler was designed in order to make process become diagonal, and parameters of PID controllers are defined for the two SISO (single-input single-output) processes starting from relation between IE (integral error) criterion and integrator gain, taking into account desired response characteristics deriving from technological requirements of controlled plant. Their connecting provides centralized control. Analysis of the processes responses, obtained by the proposed algorithm and their comparison with the results from the literature, were performed after the completion of the simulations. The proposed approach to the centralized controller design, beside its simplicity of usage and flexibility in achieving diversity of process dynamic behavior, gives better response characteristics, in comparison with existing control algorithms for distillation column in the literature.","PeriodicalId":12913,"journal":{"name":"Hemijska Industrija","volume":null,"pages":null},"PeriodicalIF":0.9,"publicationDate":"2017-07-26","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"42568269","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2017-07-26DOI: 10.2298/HEMIND160418031S
J. Sencanski, M. Vujković, Ivana Stojković, D. Majstorović, D. Bajuk-Bogdanović, Ferenc T. Pastor, S. Mentus
Nekoliko istrosenih komercijalnih Li-jonskih baterija reciklirano je relativno brzim, ekonomicnim i jednostavnim postupkom. Posle mehanickog rastavljanja komponenti komercijalnih baterija sa Li(Co–Mn–Ni)O 2 kao katodnim materijalom, ispitana su tri nacina odvajanja katodnog materijala od Al kolektora: 1. rastvaranjem Al podloge u alkalnoj sredini, 2. ispiranje pomocu rastvaraca N -metilpirolidona i 3. termickim razaranjem veziva na 700 °C. U pogledu prinosa datog materijala postupak rastvaranja u alkalnoj sredini se pokazao kao najefikasniji. Hemijski sastav pojedinacnih komponenti baterija (kosuljice, Al/Cu kolektora, katodnog materijala,...) određen je atomskom apsorpcionom spektrometrijom, pri cemu su ispitivane komponente prethodno prevedene u stanje rastvora. Nakon odvajanja katodnog materijala i prevođenja u stanje nitratnog rastvora ponovo je izvrsena sinteza metodom sagorevanja citratnog gela. Dobijeni proizvod je, nakon žarenja na 750 °C, karakterisan metodama difrakcije X-zraka i ramanske spektroskopije. Dobijen je proizvod stehiometrijskog sastava LiCo 0,59 Mn 0,26 Ni 0,15 O 2 , heksagonalne slojevite strukture tipa α -NaFeO 2 . Funkcionalnost resintetisanog materijala ispitana je u 1 M rastvoru LiClO 4 u propilen-karbonatu, galvanostatskim punjenjem i pražnjenjem, pri gustini struje od 0,7 C. Reciklirani materijal pokazuje relativno dobre kapacitete punjenja i pražnjenja koji iznose 94,9 i 64,8 mA h g –1 , redom.
{"title":"Recycling of LiCo0.59Mn0.26Ni0.15O2 cathodic material from spent Li-ion batteries by the method of the citrate gel combustion","authors":"J. Sencanski, M. Vujković, Ivana Stojković, D. Majstorović, D. Bajuk-Bogdanović, Ferenc T. Pastor, S. Mentus","doi":"10.2298/HEMIND160418031S","DOIUrl":"https://doi.org/10.2298/HEMIND160418031S","url":null,"abstract":"Nekoliko istrosenih komercijalnih Li-jonskih baterija reciklirano je relativno brzim, ekonomicnim i jednostavnim postupkom. Posle mehanickog rastavljanja komponenti komercijalnih baterija sa Li(Co–Mn–Ni)O 2 kao katodnim materijalom, ispitana su tri nacina odvajanja katodnog materijala od Al kolektora: 1. rastvaranjem Al podloge u alkalnoj sredini, 2. ispiranje pomocu rastvaraca N -metilpirolidona i 3. termickim razaranjem veziva na 700 °C. U pogledu prinosa datog materijala postupak rastvaranja u alkalnoj sredini se pokazao kao najefikasniji. Hemijski sastav pojedinacnih komponenti baterija (kosuljice, Al/Cu kolektora, katodnog materijala,...) određen je atomskom apsorpcionom spektrometrijom, pri cemu su ispitivane komponente prethodno prevedene u stanje rastvora. Nakon odvajanja katodnog materijala i prevođenja u stanje nitratnog rastvora ponovo je izvrsena sinteza metodom sagorevanja citratnog gela. Dobijeni proizvod je, nakon žarenja na 750 °C, karakterisan metodama difrakcije X-zraka i ramanske spektroskopije. Dobijen je proizvod stehiometrijskog sastava LiCo 0,59 Mn 0,26 Ni 0,15 O 2 , heksagonalne slojevite strukture tipa α -NaFeO 2 . Funkcionalnost resintetisanog materijala ispitana je u 1 M rastvoru LiClO 4 u propilen-karbonatu, galvanostatskim punjenjem i pražnjenjem, pri gustini struje od 0,7 C. Reciklirani materijal pokazuje relativno dobre kapacitete punjenja i pražnjenja koji iznose 94,9 i 64,8 mA h g –1 , redom.","PeriodicalId":12913,"journal":{"name":"Hemijska Industrija","volume":null,"pages":null},"PeriodicalIF":0.9,"publicationDate":"2017-07-26","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"42998656","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2017-07-26DOI: 10.2298/HEMIND160317029D
S. Đorđević, D. Stanojević, M. Vidović, Violeta Mandić, I. Trajković
The standard technology of seed processing uses mainly chemical products . Recent researches showed that toxic materials from chemical fertilizers can be harmful to humans, animals and the environment. Currently the attention of researches is shifting away from chemical fertlizers and toward alternative that consumers perceive to be natural, Plant Growth Promoting bacteria (PGP). PGP bacteria could be a way to reduce chemical fertilizer doses . This was the reason to test the ability of Bacillus megaterium , Azotobacter chroococcum to produce hormone auxin (IAA). Bacterial strains were identified by PCR amplification and sequencing of the 16S rRNA gene. Indole-3-acetic acid (IAA) was detected and quantified by MRM experiment. This study conducted that maize seed inoculation with IAA from species mentioned above showed positive effects. They had statistically significantly higher root and steam height compared to control seedlings. Bacterial strains tested in this study may be recommended as PGP (Plant Growth Promoting) bacteria, due to their positive effects and eventually can be used to reduce chemical fertilizers doses.
{"title":"The use of Bacterial Indol-3-acetic acid (IAA) for reduce of chemical fertilizers doses","authors":"S. Đorđević, D. Stanojević, M. Vidović, Violeta Mandić, I. Trajković","doi":"10.2298/HEMIND160317029D","DOIUrl":"https://doi.org/10.2298/HEMIND160317029D","url":null,"abstract":"The standard technology of seed processing uses mainly chemical products . Recent researches showed that toxic materials from chemical fertilizers can be harmful to humans, animals and the environment. Currently the attention of researches is shifting away from chemical fertlizers and toward alternative that consumers perceive to be natural, Plant Growth Promoting bacteria (PGP). PGP bacteria could be a way to reduce chemical fertilizer doses . This was the reason to test the ability of Bacillus megaterium , Azotobacter chroococcum to produce hormone auxin (IAA). Bacterial strains were identified by PCR amplification and sequencing of the 16S rRNA gene. Indole-3-acetic acid (IAA) was detected and quantified by MRM experiment. This study conducted that maize seed inoculation with IAA from species mentioned above showed positive effects. They had statistically significantly higher root and steam height compared to control seedlings. Bacterial strains tested in this study may be recommended as PGP (Plant Growth Promoting) bacteria, due to their positive effects and eventually can be used to reduce chemical fertilizers doses.","PeriodicalId":12913,"journal":{"name":"Hemijska Industrija","volume":null,"pages":null},"PeriodicalIF":0.9,"publicationDate":"2017-07-26","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"48234265","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2017-07-26DOI: 10.2298/HEMIND160414033B
Nikola Bobić, R. Simonović, S. Drmanic, Stefan Z. Milić, J. Nikolic, S. Stoiljković, Nebojša S. Terzić
The study describes the results of static, physicochemical and ballistic examination of double-based gunpowder charges, in order to establish the deviations from the demanded quality of mortar ammunition. The examinations were carried out on gunpowder samples used for laboration of mortar shells 60, 82 and 120 mm caliber and consisted of periodical measurements of the gunpowder mass loss, basic ballistic parameters, and compatibility testing of gunpowder and celluloid containers as well as chemical stability determination. The estimation of the gunpowder quality was performed by comparative analysis and the suggestions for more efficient production of it were given.
{"title":"The influence of migration processes in gunpowder charge on the quality of mortar ammunition","authors":"Nikola Bobić, R. Simonović, S. Drmanic, Stefan Z. Milić, J. Nikolic, S. Stoiljković, Nebojša S. Terzić","doi":"10.2298/HEMIND160414033B","DOIUrl":"https://doi.org/10.2298/HEMIND160414033B","url":null,"abstract":"The study describes the results of static, physicochemical and ballistic examination of double-based gunpowder charges, in order to establish the deviations from the demanded quality of mortar ammunition. The examinations were carried out on gunpowder samples used for laboration of mortar shells 60, 82 and 120 mm caliber and consisted of periodical measurements of the gunpowder mass loss, basic ballistic parameters, and compatibility testing of gunpowder and celluloid containers as well as chemical stability determination. The estimation of the gunpowder quality was performed by comparative analysis and the suggestions for more efficient production of it were given.","PeriodicalId":12913,"journal":{"name":"Hemijska Industrija","volume":null,"pages":null},"PeriodicalIF":0.9,"publicationDate":"2017-07-26","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"47518159","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2017-07-26DOI: 10.2298/HEMIND160516035M
N. Mitrović, A. Petrovic, M. Milosevic, N. Momčilović, Ž. Mišković, T. Maneski, P. Popović
Complex structure experimental analysis has always been a huge challenge for researchers. Conventional experimental methods ( e.g ., strain gauges) give only limited data sets regarding measurement on critical areas with high geometrical discontinuities. A 3D Digital Image Correlation method is an optical method that overcomes the limitations of conventional methods and enables full-field displacement and strain measurement of geometrically complex structures. System Aramis, based on Digital Image Correlation method, is used for experimental analysis and numerical model verification in this paper. Investigated complex structure is sphere/cylinder junction on globe valve housing subjected to axial loading. The highest experimentally measured von Mises strain values around 0.15% are recorded on cylinder/sphere intersection. Von Mises strain values on cylindrical and spherical part are several times smaller than on intersection itself. It is important to emphasize that, to the authors’ best knowledge, this is the first paper showing experimental results of 3D full and strain field of geometrically complex structure (sphere/cylinder intersection) on the intersection itself on pressure equipment. It is proven that 3D Digital Image Correlation method is fast and versatile method for recording strain during loading of complex structures.
{"title":"Experimental and numerical study of globe valve housing","authors":"N. Mitrović, A. Petrovic, M. Milosevic, N. Momčilović, Ž. Mišković, T. Maneski, P. Popović","doi":"10.2298/HEMIND160516035M","DOIUrl":"https://doi.org/10.2298/HEMIND160516035M","url":null,"abstract":"Complex structure experimental analysis has always been a huge challenge for researchers. Conventional experimental methods ( e.g ., strain gauges) give only limited data sets regarding measurement on critical areas with high geometrical discontinuities. A 3D Digital Image Correlation method is an optical method that overcomes the limitations of conventional methods and enables full-field displacement and strain measurement of geometrically complex structures. System Aramis, based on Digital Image Correlation method, is used for experimental analysis and numerical model verification in this paper. Investigated complex structure is sphere/cylinder junction on globe valve housing subjected to axial loading. The highest experimentally measured von Mises strain values around 0.15% are recorded on cylinder/sphere intersection. Von Mises strain values on cylindrical and spherical part are several times smaller than on intersection itself. It is important to emphasize that, to the authors’ best knowledge, this is the first paper showing experimental results of 3D full and strain field of geometrically complex structure (sphere/cylinder intersection) on the intersection itself on pressure equipment. It is proven that 3D Digital Image Correlation method is fast and versatile method for recording strain during loading of complex structures.","PeriodicalId":12913,"journal":{"name":"Hemijska Industrija","volume":null,"pages":null},"PeriodicalIF":0.9,"publicationDate":"2017-07-26","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"43667862","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2017-07-26DOI: 10.2298/HEMIND160318030W
K. H. Waisi, Z. Petković, R. Nikolic, Z. Jankovic, B. Raicević, T. B. Lalevic, S. Z. Giba
In this study, influence of wide range of 24-epibrassinolide (24-EBL) on early growth potential of two maize hybrids (ZP 434 and ZP 704) was examined. Paper concerns germination, seedling biomass, important chlorophylls content, and redistribution of elements (heavy metals and microelements), in a seedlings of the maize hybrids, as influenced by different 24-EBL concentrations. It was found that hybrids react differently to exogenously applied hormone. The biggest differences between two examined maize hybrids considering the germination level were reached with the lowest values at 86% for ZP 704 and 72% for ZP 434, gained at the highest applied concentration of 24-EBL. Seedlings of hybrid ZP 434 reacted positively moderately in the case of shoot length and biomass under the influence of 24-EBL, but seedlings of hybrid ZP 704 had lower values of these parameters under the influence of the phytohormone. Chlorophyll a/b ratios showed that photosynthetic apparatus of seedlings of the hybrids is not active in this stage of development. It was established that 24-EBL affects seedling growth and re-allocation of naturally present mineral elements in early growth stages and that could be one of the reason for poorer growth of ZP 704 treated with various concentrations of 24-EBL, comparing to control. When applied in lower concentrations, 24-EBL is blocking toxic elements such as chromium and nickel to relocate to vital parts of plant, what was case in hybrid ZP704. In case of ZP 434, lower concentrations of 24-EBL are affecting re-allocation of Cu and Cr and these findings suggest that maize hybrid seedlings treated with lower concentrations of 24-EBL could survive and be successful in polluted areas.
{"title":"Influence of 24-epibrassinolide on seedling growth and distribution of mineral elements in two maize hybrids","authors":"K. H. Waisi, Z. Petković, R. Nikolic, Z. Jankovic, B. Raicević, T. B. Lalevic, S. Z. Giba","doi":"10.2298/HEMIND160318030W","DOIUrl":"https://doi.org/10.2298/HEMIND160318030W","url":null,"abstract":"In this study, influence of wide range of 24-epibrassinolide (24-EBL) on early growth potential of two maize hybrids (ZP 434 and ZP 704) was examined. Paper concerns germination, seedling biomass, important chlorophylls content, and redistribution of elements (heavy metals and microelements), in a seedlings of the maize hybrids, as influenced by different 24-EBL concentrations. It was found that hybrids react differently to exogenously applied hormone. The biggest differences between two examined maize hybrids considering the germination level were reached with the lowest values at 86% for ZP 704 and 72% for ZP 434, gained at the highest applied concentration of 24-EBL. Seedlings of hybrid ZP 434 reacted positively moderately in the case of shoot length and biomass under the influence of 24-EBL, but seedlings of hybrid ZP 704 had lower values of these parameters under the influence of the phytohormone. Chlorophyll a/b ratios showed that photosynthetic apparatus of seedlings of the hybrids is not active in this stage of development. It was established that 24-EBL affects seedling growth and re-allocation of naturally present mineral elements in early growth stages and that could be one of the reason for poorer growth of ZP 704 treated with various concentrations of 24-EBL, comparing to control. When applied in lower concentrations, 24-EBL is blocking toxic elements such as chromium and nickel to relocate to vital parts of plant, what was case in hybrid ZP704. In case of ZP 434, lower concentrations of 24-EBL are affecting re-allocation of Cu and Cr and these findings suggest that maize hybrid seedlings treated with lower concentrations of 24-EBL could survive and be successful in polluted areas.","PeriodicalId":12913,"journal":{"name":"Hemijska Industrija","volume":null,"pages":null},"PeriodicalIF":0.9,"publicationDate":"2017-07-26","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"41819069","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2017-07-26DOI: 10.2298/HEMIND160120032S
N. D. Shooto, E. Dikio, D. Wankasi, L. Sikhwivhilu
Metal organic frameworks (MOFs) based on iron as a central metal ion and 1,2,4,5-tetrabenzenecarboxylic acid as ligand was successful synthesized, characterized and studied as adsorbent for the removal of lead ions in aqueous solution. Characterization of Fe-MOF was attained by SEM, EDX, TGA and FT-IR techniques. EDX spectrum showed the presence of C, O and Fe, which may facilitate in creating charges and functionalities on the surface of the Fe-MOF for adsorption. The kinetic and thermodynamic parameters were also investigated. The results showed that Fe-MOF has a high Pb 2+ adsorption affinity. The removal of Pb 2+ from aqueous solutions varied with concentration, contact time and temperature. All adsorption studies were carried out in batch experiments.
{"title":"Iron based metal organic framework as an effective lead ions remover from aqueous solution: Thermodynamic and kinetics studies","authors":"N. D. Shooto, E. Dikio, D. Wankasi, L. Sikhwivhilu","doi":"10.2298/HEMIND160120032S","DOIUrl":"https://doi.org/10.2298/HEMIND160120032S","url":null,"abstract":"Metal organic frameworks (MOFs) based on iron as a central metal ion and 1,2,4,5-tetrabenzenecarboxylic acid as ligand was successful synthesized, characterized and studied as adsorbent for the removal of lead ions in aqueous solution. Characterization of Fe-MOF was attained by SEM, EDX, TGA and FT-IR techniques. EDX spectrum showed the presence of C, O and Fe, which may facilitate in creating charges and functionalities on the surface of the Fe-MOF for adsorption. The kinetic and thermodynamic parameters were also investigated. The results showed that Fe-MOF has a high Pb 2+ adsorption affinity. The removal of Pb 2+ from aqueous solutions varied with concentration, contact time and temperature. All adsorption studies were carried out in batch experiments.","PeriodicalId":12913,"journal":{"name":"Hemijska Industrija","volume":null,"pages":null},"PeriodicalIF":0.9,"publicationDate":"2017-07-26","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"44339407","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2017-06-30DOI: 10.2298/HEMIND160415037V
Aleksandra S. Vučinić, Ž. Kamberović, M. Ranitović, T. Kovačević, Irena D. Najčević
U ovom radu prikazana je analiza kolicina plastike i stampanih ploca iz elektricnog i elektronskog otpada (e-otpad) u Republici Srbiji, kao i predlog postupka reciklaže granulata nemetalicne frakcije stampane ploce. Cilj rada je analiza reciklata stampanih ploca, kao i mogucnost primene. Podaci o kolicinama i nacinu postupanja sa plastikom i stampanim plocama, dobijeni su putem upitnika koji su poslati operaterima koji tretiraju pomenuti otpad. Rezultati analize upitnika su pokazali da je u 2014. godini rasklapanjem e-otpada izdvojeno 1.870,95 t plastike i 499,85 t stampanih ploca. Za ispitivanje reciklažnog potencijala koriscen je granulat stampanih ploca dobijen nakon mehanickog predtretmana i selektivnog izdvajanja metala hidrometalurskim postupcima. Karakterizacija granulata sprovedena je kroz ispitivanje granulometrijskog i hemijskog sastava predmetnog materijala za svaku izdvojenu frakciju. Potom je izvrsena manuelna klasifikacija razlicitih tipova polimernih materijala sadržanih u granulatu, kao i određivanje prividne specificne težine i hemijskog sastava klasifikovanih tipova polimernih materijala. Hemijski sastav granulata određen je metodom fluorescencije X-zracima (XRF), dok je identifikacija zaostalih polimernih materijala određena FTIR (Fourier Transform Infrared Spectroscopy) metodom. Na osnovu ovog istraživanja, može se zakljuciti da nemetalicna frakcija ima upotrebnu vrednost za dobijanje novih polimernih materijala za tehnicku upotrebu, sto je predmet mnogih istraživanja pomenutih i u ovom radu.
在这项工作中，对塞尔维亚共和国的电气和电子废物（电子废物）中的塑料和印刷纸张进行了分析，并提出了回收印刷纸张颗粒中非金属部分的建议。这项工作的目的是分析印刷纸张的回收利用情况，以及应用它们的可能性。关于塑料板和印刷板处理的数量和方法的数据是通过向废物处理操作员发送的问卷获得的。问卷分析结果显示，2014年。电子垃圾每年分发1870.95吨塑料和499.85吨印刷纸。在可回收潜力的研究中，印刷版的颗粒是在经过机械处理和有效分配金属亚氢甲基后使用的。颗粒特性是通过对每个单独部分的材料进行粒度和化学研究来实现的。波托姆·伊兹夫塞纳（Potom je izvrsena manuelna klasifikacija razriciih tipova polimernih materijala sadržanih u granteu）是一位特殊的女性，她是一位女性。颗粒的化学成分通过X射线荧光法（XRF）测定，而其他聚合物材料的鉴定则通过FTIR（傅立叶变换红外光谱法）测定。基于这项研究，可以得出结论，非金属部分有助于获得用于技术用途的新型聚合物材料，这是本工作中提到的许多研究的主题。
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