Pub Date : 2021-01-01DOI: 10.47743/achi-2021-2-0007
Hanumantha Rao Daruvuru, Ganapathi Rao Gajula, A. Chintabathini, M. Dasari
Ferroelectric-Ferrite composite with composition (x) Li0.5Fe2.5O4 + (1-x) BaTiO3 (for x= 0, 0.20 & 0.40) were prepared by the conventional sintering technique at 900C for 4 hours. Presence of two phases is further confirmed by x-ray diffraction analysis and lowering of c/a ratio show incorporation of ferrite in ferroelectric compound. Dielectric constant decreases with increase in ferrite content indicating lowering contribution due to interfacial polarization. An increase of Curie temperature with increase in ferrite content suggests an increase of material stability in high temperature region.
{"title":"VARIATION IN DIELECTRIC PROPERTIES OF COMPOSITE CERAMICS: LITHIUM FERRITE SUBSTITUTED BARIUM TITANATE","authors":"Hanumantha Rao Daruvuru, Ganapathi Rao Gajula, A. Chintabathini, M. Dasari","doi":"10.47743/achi-2021-2-0007","DOIUrl":"https://doi.org/10.47743/achi-2021-2-0007","url":null,"abstract":"Ferroelectric-Ferrite composite with composition (x) Li0.5Fe2.5O4 + (1-x) BaTiO3 (for x= 0, 0.20 & 0.40) were prepared by the conventional sintering technique at 900C for 4 hours. Presence of two phases is further confirmed by x-ray diffraction analysis and lowering of c/a ratio show incorporation of ferrite in ferroelectric compound. Dielectric constant decreases with increase in ferrite content indicating lowering contribution due to interfacial polarization. An increase of Curie temperature with increase in ferrite content suggests an increase of material stability in high temperature region.","PeriodicalId":6958,"journal":{"name":"Acta Chemica Iasi","volume":null,"pages":null},"PeriodicalIF":0.5,"publicationDate":"2021-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"90755799","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 : 2021-01-01DOI: 10.47743/achi-2021-2-0013
Ruwanthi Amarasekara, S. Wickramarachchi
Nutritional compounds in yams may leach out to the cooking water under most traditional domestic cooking methods. Finding alternative uses of these waste waters without discarding, can maximize the usage and importance of these yams. This study aimed to quantify the bioactive compounds and determine the antioxidant activity in the cooking water collected after boiling of Dioscorea alata L. tubers under two domestic cooking methods. Raja ala yams were boiled in water using conventional boiling (CB) and pressure cooking (PC) methods. The cooking water of both methods were collected and concentrated to obtain the solid crude product. Aqueous solutions of the crude product of CB and PC samples were prepared and subjected to qualitative phytochemical analysis. Further, they were assayed for total phenolic content (TPC), total flavonoid content (TFC), and total anthocyanin content (TAC). Antioxidant activity of each crude product was determined and a correlation between the antioxidant activity and TPC, TFC and TAC of the samples was developed using the Pearson’s correlation method. Phytochemical screening of CB and PC samples showed the presence of alkaloids, flavonoids, phenols, saponin, tannins and coumarins and an absence of proteins. CB showed a significantly higher TPC than that of PC whereas the TFC of PC was higher than CB. Both methods however, showed no significant difference in TAC extraction. Antioxidant assays showed higher activity in CB over the PC sample. A strong correlation was observed between TPC versus DPPH activity (IC50 value) and TAA of the samples. It can thus be concluded that the wastewater of both cooking methods contain a significant amount of bioactive compounds, making it a nutritious source to be further investigated and to be made use for alternate purposes without discarding it.
{"title":"ANTIOXIDANT ACTIVITY OF PHENOLIC COMPOUNDS IN Dioscorea alata L. (RAJA ALA) TUBER COOKING WATER","authors":"Ruwanthi Amarasekara, S. Wickramarachchi","doi":"10.47743/achi-2021-2-0013","DOIUrl":"https://doi.org/10.47743/achi-2021-2-0013","url":null,"abstract":"Nutritional compounds in yams may leach out to the cooking water under most traditional domestic cooking methods. Finding alternative uses of these waste waters without discarding, can maximize the usage and importance of these yams. This study aimed to quantify the bioactive compounds and determine the antioxidant activity in the cooking water collected after boiling of Dioscorea alata L. tubers under two domestic cooking methods. Raja ala yams were boiled in water using conventional boiling (CB) and pressure cooking (PC) methods. The cooking water of both methods were collected and concentrated to obtain the solid crude product. Aqueous solutions of the crude product of CB and PC samples were prepared and subjected to qualitative phytochemical analysis. Further, they were assayed for total phenolic content (TPC), total flavonoid content (TFC), and total anthocyanin content (TAC). Antioxidant activity of each crude product was determined and a correlation between the antioxidant activity and TPC, TFC and TAC of the samples was developed using the Pearson’s correlation method. Phytochemical screening of CB and PC samples showed the presence of alkaloids, flavonoids, phenols, saponin, tannins and coumarins and an absence of proteins. CB showed a significantly higher TPC than that of PC whereas the TFC of PC was higher than CB. Both methods however, showed no significant difference in TAC extraction. Antioxidant assays showed higher activity in CB over the PC sample. A strong correlation was observed between TPC versus DPPH activity (IC50 value) and TAA of the samples. It can thus be concluded that the wastewater of both cooking methods contain a significant amount of bioactive compounds, making it a nutritious source to be further investigated and to be made use for alternate purposes without discarding it.","PeriodicalId":6958,"journal":{"name":"Acta Chemica Iasi","volume":null,"pages":null},"PeriodicalIF":0.5,"publicationDate":"2021-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"72853775","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 : 2021-01-01DOI: 10.47743/achi-2021-2-0011
Ehab Fadhel Abed, A. A. Alkarimi
Glycidyl methacrylate‐co-ethylene dimethcrylate-coacryl amide monolithic column was synthesized as a strong cation exchange column. A borosilicate tube (60 mm in length) with 1.5 mm and 3.0 mm (i.d and o.d respectively) was used for in-situ copolymerization using U.V light source. Monomers (glycidyle metharcrylate and acrylamide) and crosslinker ethylene dimethacrylate were dissolved in a porogenic solvent consisting of 1-propanol and 2-butanol. The polymer was formed after 4 min. After that, the epoxy groups in glycidyle methacrylate were opened to form a cation exchange monolithic column by pumping 0.2 M HCl. The monolith was characterized using diverse techniques such as FT-IR, BET, and FE-SEM. From FT-IR spectrum it can be noticed that the peak of (C=C) in the monomers and crosslinker are disappeared which is consider a significant indicator for polymer formation. The BET technique was used to investigate the pore size and surface area of the monolith, the result showed that the average pores size was 5.1859 nm and the surface area was 16.021 m/g. The FE-SEM technique was used to study the monolith morphology and the type of pore and the result proved that the monolith has a network of enormous channels and macroporse. The Prepared monolith in this study was used to remove copper ions and determine these ions using ion-exchange techniques.
合成了甲基丙烯酸缩水甘油酯-二甲基乙酸乙酯-丙烯酰胺整体柱作为强阳离子交换柱。采用长度为60mm、直径为1.5 mm和3.0 mm的硼硅酸盐管，在紫外光源下进行原位共聚。将单体(甲基丙烯酸缩水甘油酯和丙烯酰胺)和交联剂二甲基丙烯酸乙酯溶解在由1-丙醇和2-丁醇组成的致孔溶剂中。4 min后聚合物形成，然后泵送0.2 M HCl，打开甲基丙烯酸甘酯中的环氧基，形成阳离子交换整体柱。采用FT-IR, BET和FE-SEM等多种技术对其进行了表征。从FT-IR光谱中可以注意到单体和交联剂中的(C=C)峰消失，这被认为是聚合物形成的重要指标。采用BET技术对单块体的孔径和比表面积进行了研究，结果表明，单块体的平均孔径为5.1859 nm，比表面积为16.021 m/g。利用FE-SEM技术研究了整体体的形态和孔隙类型，结果表明整体体具有巨大的通道网络和大孔。本研究利用所制备的整体石去除铜离子，并利用离子交换技术对铜离子进行测定。
{"title":"ION EXCHANGE MONOLITHIC COLUMN FOR COPPER DETERMINATION","authors":"Ehab Fadhel Abed, A. A. Alkarimi","doi":"10.47743/achi-2021-2-0011","DOIUrl":"https://doi.org/10.47743/achi-2021-2-0011","url":null,"abstract":"Glycidyl methacrylate‐co-ethylene dimethcrylate-coacryl amide monolithic column was synthesized as a strong cation exchange column. A borosilicate tube (60 mm in length) with 1.5 mm and 3.0 mm (i.d and o.d respectively) was used for in-situ copolymerization using U.V light source. Monomers (glycidyle metharcrylate and acrylamide) and crosslinker ethylene dimethacrylate were dissolved in a porogenic solvent consisting of 1-propanol and 2-butanol. The polymer was formed after 4 min. After that, the epoxy groups in glycidyle methacrylate were opened to form a cation exchange monolithic column by pumping 0.2 M HCl. The monolith was characterized using diverse techniques such as FT-IR, BET, and FE-SEM. From FT-IR spectrum it can be noticed that the peak of (C=C) in the monomers and crosslinker are disappeared which is consider a significant indicator for polymer formation. The BET technique was used to investigate the pore size and surface area of the monolith, the result showed that the average pores size was 5.1859 nm and the surface area was 16.021 m/g. The FE-SEM technique was used to study the monolith morphology and the type of pore and the result proved that the monolith has a network of enormous channels and macroporse. The Prepared monolith in this study was used to remove copper ions and determine these ions using ion-exchange techniques.","PeriodicalId":6958,"journal":{"name":"Acta Chemica Iasi","volume":null,"pages":null},"PeriodicalIF":0.5,"publicationDate":"2021-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"82666532","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 : 2021-01-01DOI: 10.47743/ACHI-2021-1-0005
T. Agacayak, Osman Agca
In this study, the hydrophobic flocculation behavior of lignite coal obtained from Beyşehir region in Turkey and the effect of some parameters were investigated. These parameters were selected as pH, amount of dispersant, amount of binding liquid, flock growth time, stirring speed, flocculation time and solid ratio. The ash content (ash, %) and combustible recovery (CR, %) of the flocks obtained as a result of the experiments were determined. As a result of the studies, the optimum pH value (3), amount of sodium silicate (1 mL), amount of waste motor oil (3 mL), flock growth time (1 min), stirring speed (1250 rpm), flocculation time (2 min) and solid ratio (5 g) were determined. The hydrophobicity of fine coal grains was increased by using waste motor oil. According to the hydrophobic flocculation results of coal grains, flocks with 17.03% ash content and 99.06% combustion recovery were obtained. While the contact angle of the original coal was 44°, it was observed that the contact angle of the obtained flocks reached 117°. It was determined from experiments that the surfaces of the coal grains have a very high hydrophobicity. As a result, clean coal with a reduced ash content of 53.22% was obtained.
{"title":"CLEANING OF BEYŞEHİR (BAYAVŞAR) COAL IN TURKEY WITH HYDROPHOBIC FLOCCULATION USING WASTE MOTOR OIL","authors":"T. Agacayak, Osman Agca","doi":"10.47743/ACHI-2021-1-0005","DOIUrl":"https://doi.org/10.47743/ACHI-2021-1-0005","url":null,"abstract":"In this study, the hydrophobic flocculation behavior of lignite coal obtained from Beyşehir region in Turkey and the effect of some parameters were investigated. These parameters were selected as pH, amount of dispersant, amount of binding liquid, flock growth time, stirring speed, flocculation time and solid ratio. The ash content (ash, %) and combustible recovery (CR, %) of the flocks obtained as a result of the experiments were determined. As a result of the studies, the optimum pH value (3), amount of sodium silicate (1 mL), amount of waste motor oil (3 mL), flock growth time (1 min), stirring speed (1250 rpm), flocculation time (2 min) and solid ratio (5 g) were determined. The hydrophobicity of fine coal grains was increased by using waste motor oil. According to the hydrophobic flocculation results of coal grains, flocks with 17.03% ash content and 99.06% combustion recovery were obtained. While the contact angle of the original coal was 44°, it was observed that the contact angle of the obtained flocks reached 117°. It was determined from experiments that the surfaces of the coal grains have a very high hydrophobicity. As a result, clean coal with a reduced ash content of 53.22% was obtained.","PeriodicalId":6958,"journal":{"name":"Acta Chemica Iasi","volume":null,"pages":null},"PeriodicalIF":0.5,"publicationDate":"2021-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"73401220","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 : 2021-01-01DOI: 10.47743/ACHI-2021-1-0002
K. Shaikh, Uddhav N. Chaudhar
A highly efficient, clean and simple protocol has been established for the synthesis of [1,2,4]-triazolo-quinazolinone and [1,2,4]-triazolo-pyrimidine derivatives in the presence of CAN. This CAN was effective for the one-pot multicomponent reaction of aromatic aldehyde, dimedone or ethyl acetoacetate and 3-amino-1,2,4-triazole in acetonitrile under mild reaction conditions. The present work shows attractive features, such as the short reaction time, excellent yield, mild reaction condition, easily isolated the product and no need of chromatographic separation.
{"title":"NOVEL SYNTHESIS OF [1,2,4]-TRIAZOLO-QUINAZOLINONE AND PYRIMIDINE DERIVATIVES MEDIATED BY CERIC AMMONIUM NITRATE (CAN)","authors":"K. Shaikh, Uddhav N. Chaudhar","doi":"10.47743/ACHI-2021-1-0002","DOIUrl":"https://doi.org/10.47743/ACHI-2021-1-0002","url":null,"abstract":"A highly efficient, clean and simple protocol has been established for the synthesis of [1,2,4]-triazolo-quinazolinone and [1,2,4]-triazolo-pyrimidine derivatives in the presence of CAN. This CAN was effective for the one-pot multicomponent reaction of aromatic aldehyde, dimedone or ethyl acetoacetate and 3-amino-1,2,4-triazole in acetonitrile under mild reaction conditions. The present work shows attractive features, such as the short reaction time, excellent yield, mild reaction condition, easily isolated the product and no need of chromatographic separation.","PeriodicalId":6958,"journal":{"name":"Acta Chemica Iasi","volume":null,"pages":null},"PeriodicalIF":0.5,"publicationDate":"2021-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"89320764","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}
{"title":"EMULSIFYING ABILITY OF BIOCOMPOSITION BASED ON HUMIC SUBSTANCES AND MICROORGANISMS\u0000 OF THE GENUS RHODOCOCCUS IN THE RELATION TO OIL","authors":"M. M. Gertsen, E. Dmitrieva","doi":"10.2478/achi-2020-0008","DOIUrl":"https://doi.org/10.2478/achi-2020-0008","url":null,"abstract":"","PeriodicalId":6958,"journal":{"name":"Acta Chemica Iasi","volume":null,"pages":null},"PeriodicalIF":0.5,"publicationDate":"2020-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"81837950","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}
{"title":"PHOTOPHYSICAL PROPERTIES OF SOME BENZOXAZOLE AND BENZOTHIAZOLE DERIVATIVES","authors":"Hasan Abu Jarra, R. Madwar, Joumaa Merza","doi":"10.2478/achi-2020-0005","DOIUrl":"https://doi.org/10.2478/achi-2020-0005","url":null,"abstract":"","PeriodicalId":6958,"journal":{"name":"Acta Chemica Iasi","volume":null,"pages":null},"PeriodicalIF":0.5,"publicationDate":"2020-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"79735821","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}
{"title":"DECAY RESISTANCE OF BEECH WOOD AGAINST WHITE ROT FUNGUS","authors":"A. Ghavidel, I. Sandu, V. Vasilache","doi":"10.2478/achi-2020-0012","DOIUrl":"https://doi.org/10.2478/achi-2020-0012","url":null,"abstract":"","PeriodicalId":6958,"journal":{"name":"Acta Chemica Iasi","volume":null,"pages":null},"PeriodicalIF":0.5,"publicationDate":"2020-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"86773973","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}
{"title":"SiO2 EMBEDDED NANO-COMPOSITE COPOLYMERIC MEMBRANES OF POLY (VINYL\u0000 ALCOHOL)-G-POLYACRYLIC ACID FOR PERVAPORATION SEPARATION OF BINARY ORGANIC/ORGANIC\u0000 MIXTURES","authors":"M. Patil, M. Amshumali, S. Mathad","doi":"10.2478/achi-2020-0015","DOIUrl":"https://doi.org/10.2478/achi-2020-0015","url":null,"abstract":"","PeriodicalId":6958,"journal":{"name":"Acta Chemica Iasi","volume":null,"pages":null},"PeriodicalIF":0.5,"publicationDate":"2020-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"88383742","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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