The equilibria of the complex formation between the anionic chelate of zinc(II) with the tridentate ligand of 4-(2-pyridylazo)-resorcinol (PAR) and the bulky organic tetrazolium cation of 3-(2-naphtyl)-2,5-diphenyl-2Htetrazolium chloride (TV) in the liquid-liquid extraction system Zn(II)‒PAR‒TV‒H2O‒2-methyl-1-propanol was studied by spectrophotometric method. The molar ratio of the reagents was determined by independent methods under the optimum condition for ion-association and for extraction. The validity of Beer’s law was checked and some analytical characteristics were calculated. The constants, describing the association process in aqueous phase and the extraction equilibria, were calculated. Based on this, a reaction scheme, a general formula and a structural formula of the complex were suggested. The zinc(II) cation is six coordinated with the tridentate ligand through the following atoms: the azo nitrogen, the pyridine nitrogen and the oxygen atom from the phenolic group, which is in ortho position relative to the azo group, each of them forming two five-membered chelate rings.
用分光光度法研究了锌(II) - PAR -2 -吡啶偶氮-间苯二酚(PAR)阴离子螯合物与3-(2-萘基)-2,5-二苯基-2 -氯化四氮唑(TV)有机阳离子在液液萃取体系Zn(II) - PAR - TV - h2o -2 -甲基-1-丙醇中络合物形成的平衡。在离子缔合和萃取的最佳条件下，用独立的方法测定了试剂的摩尔比。验证了比尔定律的有效性，并计算了一些解析特性。计算了描述水相缔合过程和萃取平衡的常数。在此基础上，提出了该配合物的反应方案、通式和结构式。锌(II)阳离子通过以下原子与三齿配体六配位:偶氮氮、吡啶氮和相对于偶氮基团处于邻位的酚基氧原子，它们各自形成两个五元螯合环。
{"title":"Study on the Equilibria of the Complex Formation of Anionic Chelate of Zn(II) with Tridentate Ligand and the Cation of 3-(2-naphtyl)-2,5-diphenyl-2H-tetrazolium chloride","authors":"Kirila Stojnova, Pavel Yanev, Vanya Lekova","doi":"10.17344/acsi.2023.8197","DOIUrl":"https://doi.org/10.17344/acsi.2023.8197","url":null,"abstract":"The equilibria of the complex formation between the anionic chelate of zinc(II) with the tridentate ligand of 4-(2-pyridylazo)-resorcinol (PAR) and the bulky organic tetrazolium cation of 3-(2-naphtyl)-2,5-diphenyl-2Htetrazolium chloride (TV) in the liquid-liquid extraction system Zn(II)‒PAR‒TV‒H2O‒2-methyl-1-propanol was studied by spectrophotometric method. The molar ratio of the reagents was determined by independent methods under the optimum condition for ion-association and for extraction. The validity of Beer’s law was checked and some analytical characteristics were calculated. The constants, describing the association process in aqueous phase and the extraction equilibria, were calculated. Based on this, a reaction scheme, a general formula and a structural formula of the complex were suggested. The zinc(II) cation is six coordinated with the tridentate ligand through the following atoms: the azo nitrogen, the pyridine nitrogen and the oxygen atom from the phenolic group, which is in ortho position relative to the azo group, each of them forming two five-membered chelate rings.","PeriodicalId":7122,"journal":{"name":"Acta Chimica Slovenica","volume":"27 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2023-09-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"136309109","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}
Karam Ahmed El-Sharkawy, Rafat Milad Mohareb, Sayeed Mukhtar, Humaira Parveen, Mahmoud Ali Abdelaziz
The benzo[d]thiazole derivatives 4a–c were synthesized and used for the synthesis of thiophene derivatives 6a–f. They form the arylhydrazone derivatives 8a–i which were capable to form pyridazine derivatives 9a–i and 10a–i. The latter compounds reacted with thioglycolic acid to produce the thiazole derivatives 12a–i and 13a–i, respectively. The thiazole derivatives 15a–c were also produced from 4a–c through their reactions with elemental sulfur and phenylisothiocyanate. Further heterocyclization reactions of 15a were carried out to produce thiophene derivatives. Evaluations of the synthesized products were carried out against some selected cancer cell lines and the most active compounds were further evaluated against the seventeen cancer cell lines classified according to the disease. Morphological changes of A549 cell line by the effect of compounds 13c and 13h were studied using microenvironment of the lung tissue where an excellent result was obtained.
{"title":"Cytotoxic Activities and Morphological Sudies of Thiophene, Thiazole and Pyridazine Derivatives Synthesized from Benzo[d]thiazole Derivatives","authors":"Karam Ahmed El-Sharkawy, Rafat Milad Mohareb, Sayeed Mukhtar, Humaira Parveen, Mahmoud Ali Abdelaziz","doi":"10.17344/acsi.2023.8057","DOIUrl":"https://doi.org/10.17344/acsi.2023.8057","url":null,"abstract":"The benzo[d]thiazole derivatives 4a–c were synthesized and used for the synthesis of thiophene derivatives 6a–f. They form the arylhydrazone derivatives 8a–i which were capable to form pyridazine derivatives 9a–i and 10a–i. The latter compounds reacted with thioglycolic acid to produce the thiazole derivatives 12a–i and 13a–i, respectively. The thiazole derivatives 15a–c were also produced from 4a–c through their reactions with elemental sulfur and phenylisothiocyanate. Further heterocyclization reactions of 15a were carried out to produce thiophene derivatives. Evaluations of the synthesized products were carried out against some selected cancer cell lines and the most active compounds were further evaluated against the seventeen cancer cell lines classified according to the disease. Morphological changes of A549 cell line by the effect of compounds 13c and 13h were studied using microenvironment of the lung tissue where an excellent result was obtained.","PeriodicalId":7122,"journal":{"name":"Acta Chimica Slovenica","volume":"67 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2023-09-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"136308112","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 feasibility of using the chromogenic dye Thorin to spectrophotometrically measure lithium concentration in human saliva was explored. Absorbance wavelength maximum of the Li-Thorin complex was found to be 480 nm. Absorbance at 480 nm was obtained for saliva calibration standards containing 0.00–5.29 mEq/L of lithium. A least-squares fit produced a regression equation y = 0.128x + 1.449, R = 0.997. This was used to predict lithium concentrations in both artificially prepared lithium/saliva test solutions and in hospitalized patients treated with lithium. Results agree well with atomic absorption spectroscopy. Using a reagent blank with an equivalent amount of saliva as the test samples eliminated protein and electrolyte absorbance interference. This study supports the continued exploration of this method as a non-invasive point-of-care testing approach for monitoring saliva lithium in bipolar disorder.
{"title":"Spectrophotometric Measurement of Lithium in Human Saliva Using the Chromogenic Reagent Thorin","authors":"Stephen R. Levitt","doi":"10.17344/acsi.2023.8121","DOIUrl":"https://doi.org/10.17344/acsi.2023.8121","url":null,"abstract":"The feasibility of using the chromogenic dye Thorin to spectrophotometrically measure lithium concentration in human saliva was explored. Absorbance wavelength maximum of the Li-Thorin complex was found to be 480 nm. Absorbance at 480 nm was obtained for saliva calibration standards containing 0.00–5.29 mEq/L of lithium. A least-squares fit produced a regression equation y = 0.128x + 1.449, R = 0.997. This was used to predict lithium concentrations in both artificially prepared lithium/saliva test solutions and in hospitalized patients treated with lithium. Results agree well with atomic absorption spectroscopy. Using a reagent blank with an equivalent amount of saliva as the test samples eliminated protein and electrolyte absorbance interference. This study supports the continued exploration of this method as a non-invasive point-of-care testing approach for monitoring saliva lithium in bipolar disorder.","PeriodicalId":7122,"journal":{"name":"Acta Chimica Slovenica","volume":"69 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2023-09-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"136308284","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}
Novel anthraquinone-based cyclic antioxidants containing amino, thio and oxo groups were synthesized and their antioxidant capacity was determined by using the cerium(IV)-reducing antioxidant capacity (CERAC) assay. 1H, 13C NMR, FTIR-spectroscopy and ESI (Electrospray Ionization) mass spectrometry were used for the characterization of anthraquinone derivatives exhibiting CERAC antioxidant capacity. This study is of great importance, because the antioxidant capacity of anthraquinone compounds was analyzed for the first time by the CERAC method and CERAC-Trolox equivalent antioxidant capacity (TEAC) values were higher than that for Trolox. It should also be noted that, since all synthesized anthraquinone derivatives have the potential to find applications in terms of their biological properties due to their sulfur and nitrogen content, they will make an important contribution to the literature.
{"title":"Synthesis and Determination of Cerium(IV)-Reducing Antioxidant Capacity (CERAC) Assay of Some New Anthraquinones","authors":"Necla Bektas, Nihal Onul","doi":"10.17344/acsi.2023.8155","DOIUrl":"https://doi.org/10.17344/acsi.2023.8155","url":null,"abstract":"Novel anthraquinone-based cyclic antioxidants containing amino, thio and oxo groups were synthesized and their antioxidant capacity was determined by using the cerium(IV)-reducing antioxidant capacity (CERAC) assay. 1H, 13C NMR, FTIR-spectroscopy and ESI (Electrospray Ionization) mass spectrometry were used for the characterization of anthraquinone derivatives exhibiting CERAC antioxidant capacity. This study is of great importance, because the antioxidant capacity of anthraquinone compounds was analyzed for the first time by the CERAC method and CERAC-Trolox equivalent antioxidant capacity (TEAC) values were higher than that for Trolox. It should also be noted that, since all synthesized anthraquinone derivatives have the potential to find applications in terms of their biological properties due to their sulfur and nitrogen content, they will make an important contribution to the literature.","PeriodicalId":7122,"journal":{"name":"Acta Chimica Slovenica","volume":"44 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2023-09-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"136308279","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}
Nemanja Nikolić, Tomislav Kostić, Mlađan Golubović, Tamara Nikolić, Marija Marinković, Velimir Perić, Sara Mladenović, Aleksandar M. Veselinović
The pathogenesis of essential hypertension, congestive heart failure, and reno-vascular hypertension is related to angiotensin II. This study presents QSAR modeling for a set of compounds acting as angiotensin II receptor antagonists based on the Monte Carlo optimization with molecular graph-based and SMILES notation based descriptors. Conformation independent QSAR models were developed for three random splits. Various statistical approaches were used to assess the statistical quality of the developed models, and the obtained results were very good. This study used a novel statistical metric known as the index of ideality of correlation for the final assessment of the model, and the results that were obtained suggested that the model was good. Also, molecular fragments which account for the increases and/or decreases of a studied activity were defined and then used for the computer-aided design of new compounds as potential angiotensin II receptor antagonists. The final assessment of the designed inhibitors, was performed with the use of molecular docking studies, highlighting exceptional correlation with the QSAR modeling results. The methodology which is presented in this research can be applied for seeking new agents for cardiovascular disorders treatment by angiotensin II receptor antagonism.
{"title":"Monte Carlo Optimization Based QSAR Modeling of Angiotensin II Receptor Antagonists","authors":"Nemanja Nikolić, Tomislav Kostić, Mlađan Golubović, Tamara Nikolić, Marija Marinković, Velimir Perić, Sara Mladenović, Aleksandar M. Veselinović","doi":"10.17344/acsi.2023.8081","DOIUrl":"https://doi.org/10.17344/acsi.2023.8081","url":null,"abstract":"The pathogenesis of essential hypertension, congestive heart failure, and reno-vascular hypertension is related to angiotensin II. This study presents QSAR modeling for a set of compounds acting as angiotensin II receptor antagonists based on the Monte Carlo optimization with molecular graph-based and SMILES notation based descriptors. Conformation independent QSAR models were developed for three random splits. Various statistical approaches were used to assess the statistical quality of the developed models, and the obtained results were very good. This study used a novel statistical metric known as the index of ideality of correlation for the final assessment of the model, and the results that were obtained suggested that the model was good. Also, molecular fragments which account for the increases and/or decreases of a studied activity were defined and then used for the computer-aided design of new compounds as potential angiotensin II receptor antagonists. The final assessment of the designed inhibitors, was performed with the use of molecular docking studies, highlighting exceptional correlation with the QSAR modeling results. The methodology which is presented in this research can be applied for seeking new agents for cardiovascular disorders treatment by angiotensin II receptor antagonism.","PeriodicalId":7122,"journal":{"name":"Acta Chimica Slovenica","volume":"159 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2023-09-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"136310929","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}
Two new copper(II) complexes, [CuL] (1) and [Cu4Cl2L2(N3)2]·CH3OH (2), derived from the bis-Schiff base N,N’-bis(4-bromosalicylidene)propane-1,2-diamine (H2L) have been prepared and characterized by spectroscopy methods, as well as single crystal X-ray determination. The Cu atom in the mononuclear complex 1 is in square planar coordination. The outer and inner Cu atoms in the phenolate and azide co-bridged tetranuclear complex 2 are in square planar and square pyramidal coordination, respectively. The antibacterial activities of the Schiff base and the two copper complexes have been assayed on the bacteria Staphylococcus aureus and Escherichia coli, and the yeast Candida parapsilosis.
{"title":"Syntheses, Crystal Structures and Antimicrobial Activity of Copper(II) Complexes with the Ligand N,N’-Bis(4-bromosalicylidene)propane-1,2-diamine","authors":"Yu-Mei Hao","doi":"10.17344/acsi.2023.8104","DOIUrl":"https://doi.org/10.17344/acsi.2023.8104","url":null,"abstract":"Two new copper(II) complexes, [CuL] (1) and [Cu4Cl2L2(N3)2]·CH3OH (2), derived from the bis-Schiff base N,N’-bis(4-bromosalicylidene)propane-1,2-diamine (H2L) have been prepared and characterized by spectroscopy methods, as well as single crystal X-ray determination. The Cu atom in the mononuclear complex 1 is in square planar coordination. The outer and inner Cu atoms in the phenolate and azide co-bridged tetranuclear complex 2 are in square planar and square pyramidal coordination, respectively. The antibacterial activities of the Schiff base and the two copper complexes have been assayed on the bacteria Staphylococcus aureus and Escherichia coli, and the yeast Candida parapsilosis.","PeriodicalId":7122,"journal":{"name":"Acta Chimica Slovenica","volume":"13 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2023-09-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"136309107","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}
Two new dioxidomolybdenum(VI) complexes, [MoO2L1(EtOH)] (1) and [MoO2L2(EtOH)] (2), derived from the aroylhydrazone ligands N’-(2-hydroxyl-3-methoxybenzylidene)-3-methylbenzohydrazide (H2L1) and 4-fluoro-N’-(2-hydroxylbenzylidene) benzohydrazide (H2L2), respectively, were prepared in ethanol under ambient temperature. Both complexes were characterized by elemental analysis, IR and UV-Vis spectroscopy, as well as single crystal X-ray determination. The Mo atoms in the complexes are in octahedral coordination. Crystal structures of the complexes are stabilized by hydrogen bonds. The catalytic property for epoxidation of styrene by both complexes was studied.
{"title":"Ethanol-Coordinated Dioxidomolybdenum(VI) Complexes with Aroylhyrazone Ligands: Synthesis, Spectroscopic Characterization, Crystal structures and Catalytic Oxidation Property","authors":"Zheng Zhou, Cheng Qiu, Xiuchan Xiao, Yan Lei","doi":"10.17344/acsi.2023.8195","DOIUrl":"https://doi.org/10.17344/acsi.2023.8195","url":null,"abstract":"Two new dioxidomolybdenum(VI) complexes, [MoO2L1(EtOH)] (1) and [MoO2L2(EtOH)] (2), derived from the aroylhydrazone ligands N’-(2-hydroxyl-3-methoxybenzylidene)-3-methylbenzohydrazide (H2L1) and 4-fluoro-N’-(2-hydroxylbenzylidene) benzohydrazide (H2L2), respectively, were prepared in ethanol under ambient temperature. Both complexes were characterized by elemental analysis, IR and UV-Vis spectroscopy, as well as single crystal X-ray determination. The Mo atoms in the complexes are in octahedral coordination. Crystal structures of the complexes are stabilized by hydrogen bonds. The catalytic property for epoxidation of styrene by both complexes was studied.","PeriodicalId":7122,"journal":{"name":"Acta Chimica Slovenica","volume":"13 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2023-09-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"136310939","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}
Jian Jiang, Peng Liang, Liang Han, Hui Zhang, Zhonglu You
Three copper(II) and cobalt(III) complexes, [CuL(dca)]n (1), [CuL(N3)]n (2) and [CoL(N3)2(DMF)] (3), where L is the monoanionic form of the Schiff base (((2-(pyrrolidin-1-yl)ethyl)imino)methyl)naphthalen-2-ol (HL), and dca is dicyanamide, have been prepared and characterized by elemental analyses, IR and UV-Vis spectroscopy, as well as single crystal X-ray diffraction. The Cu atoms in complexes 1 and 2 are in square pyramidal coordination, and the Co atom in complex 3 is in octahedral one. Complexes 1 and 2 inhibit the Jack bean urease with IC50 values of 0.25 ± 0.14 and 0.32 ± 0.15 μmol L–1, respectively. Complex 3 show weak activity on Jack bean urease with percentage inhibition of 37%.
{"title":"Synthesis, Crystal Structures and Urease Inhibition of Copper(II) and Cobalt(III) Complexes Derived from (((2-(Pyrrolidin-1-yl)ethyl)imino)methyl)naphthalen-2-ol","authors":"Jian Jiang, Peng Liang, Liang Han, Hui Zhang, Zhonglu You","doi":"10.17344/acsi.2023.8253","DOIUrl":"https://doi.org/10.17344/acsi.2023.8253","url":null,"abstract":"Three copper(II) and cobalt(III) complexes, [CuL(dca)]n (1), [CuL(N3)]n (2) and [CoL(N3)2(DMF)] (3), where L is the monoanionic form of the Schiff base (((2-(pyrrolidin-1-yl)ethyl)imino)methyl)naphthalen-2-ol (HL), and dca is dicyanamide, have been prepared and characterized by elemental analyses, IR and UV-Vis spectroscopy, as well as single crystal X-ray diffraction. The Cu atoms in complexes 1 and 2 are in square pyramidal coordination, and the Co atom in complex 3 is in octahedral one. Complexes 1 and 2 inhibit the Jack bean urease with IC50 values of 0.25 ± 0.14 and 0.32 ± 0.15 μmol L–1, respectively. Complex 3 show weak activity on Jack bean urease with percentage inhibition of 37%.","PeriodicalId":7122,"journal":{"name":"Acta Chimica Slovenica","volume":"16 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2023-09-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"136310941","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}
Sulfo and carboxyl group-containing polymers and polymer/silica adsorbents poly(acrylonitrile-co-2-acrylamido-2-methylpropane-1-sulfonic acid-co-acrylic acid-co-N,N’-methylene-bis-acrylamide) [poly(AN-co-AMPS-co-AAco-MBA)] and poly(AN-co-AMPS-co-AA-co-MBA)/SiO2 were synthesized by a UV-initiated polymerization or simultaneous UV-initiated polymerization and in situ sol-gel process and used as adsorbents for removal of Co(II) and Ni(II) ions from aqueous solutions. The adsorption capacity and the effect of the pH in the removal process have been studied. The poly(AN-co-AMPS-co-AA-co-MBA) adsorbent exhibited high efficiency: up to 91.8 % removal of Co(II) and 89.7 % removal of Ni(II). Polymer/silica adsorbents showed higher removal capacity as compared to pure polymer. The adsorption kinetics of Co(II) and Ni(II) ions were found to be satisfactorily described by the pseudo-second-order reaction equation of the Lagergren kinetic model, suggesting the ion-exchange nature of the process.
采用紫外光引发聚合或同步紫外光引发聚合和原位溶胶-凝胶法合成了含磺基和羧基的聚合物和聚合物/二氧化硅吸附剂聚(丙烯腈- Co -2-丙烯酰胺-2-甲基丙烷-1-磺酸-共丙烯酸- Co -N,N ' -亚甲基-双丙烯酰胺)[聚(AN-co-AMPS-co-AAco-MBA)]和聚(AN-co-AMPS-co-AA-co-MBA)/SiO2，并将其用作去除水溶液中Co(II)和Ni(II)离子的吸附剂。研究了吸附量和pH对去除过程的影响。聚(an - Co - amp - Co - aa - Co - mba)吸附剂对Co(II)的去除率高达91.8%，对Ni(II)的去除率高达89.7%。与纯聚合物相比，聚合物/二氧化硅吸附剂具有更高的去除能力。Co(II)和Ni(II)离子的吸附动力学可以用Lagergren动力学模型的拟二级反应方程满意地描述，表明该过程具有离子交换性质。
{"title":"Со(ІІ) and Ni(II) Removal from Aqueous Solutions by Polymer and Polymer/Silica Adsorbents with Sulfo and Carboxyl groups","authors":"Mariia Zhyhailo, Oksana Demchyna, Iryna Yevchuk, Oksana Makota","doi":"10.17344/acsi.2022.7819","DOIUrl":"https://doi.org/10.17344/acsi.2022.7819","url":null,"abstract":"Sulfo and carboxyl group-containing polymers and polymer/silica adsorbents poly(acrylonitrile-co-2-acrylamido-2-methylpropane-1-sulfonic acid-co-acrylic acid-co-N,N’-methylene-bis-acrylamide) [poly(AN-co-AMPS-co-AAco-MBA)] and poly(AN-co-AMPS-co-AA-co-MBA)/SiO2 were synthesized by a UV-initiated polymerization or simultaneous UV-initiated polymerization and in situ sol-gel process and used as adsorbents for removal of Co(II) and Ni(II) ions from aqueous solutions. The adsorption capacity and the effect of the pH in the removal process have been studied. The poly(AN-co-AMPS-co-AA-co-MBA) adsorbent exhibited high efficiency: up to 91.8 % removal of Co(II) and 89.7 % removal of Ni(II). Polymer/silica adsorbents showed higher removal capacity as compared to pure polymer. The adsorption kinetics of Co(II) and Ni(II) ions were found to be satisfactorily described by the pseudo-second-order reaction equation of the Lagergren kinetic model, suggesting the ion-exchange nature of the process.","PeriodicalId":7122,"journal":{"name":"Acta Chimica Slovenica","volume":"175 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2023-09-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"136308280","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}
This work considers the reactions of dolomite powder mixed with Portland cement during ageing under accelerating conditions (60 °C, water or alkaline medium). The phase composition and microstructure of cement-dolomite mortars were studied using X-ray diffraction (XRD), thermogravimetric analysis (TGA), and scanning electron microscopy with X-ray microanalysis (SEM-EDS). The results showed that the alkalinity of the medium increased the dolomite reaction degree but did not affect the reaction products’ composition. The formation of the hydrotalcite-like phase with the general formula Mg4Al2(CO3)1−x(OH)12+2x·nH2O proved to be the predominant route of dolomite consumption in the presence of available aluminium in the hardened cement paste. Then, after three months of ageing, an interlayer anions replacement became noticeable: carbonate anions in the structure of hydrotalcite are gradually replaced by hydroxide ones.
{"title":"Formation and Evolution of the Hydrotalcite-Like Phase During Ageing of Dolomite-Cement Mortars under Various Conditions","authors":"Elena Sutormina, Marjan Marinšek, Anton Meden","doi":"10.17344/acsi.2022.7907","DOIUrl":"https://doi.org/10.17344/acsi.2022.7907","url":null,"abstract":"This work considers the reactions of dolomite powder mixed with Portland cement during ageing under accelerating conditions (60 °C, water or alkaline medium). The phase composition and microstructure of cement-dolomite mortars were studied using X-ray diffraction (XRD), thermogravimetric analysis (TGA), and scanning electron microscopy with X-ray microanalysis (SEM-EDS). The results showed that the alkalinity of the medium increased the dolomite reaction degree but did not affect the reaction products’ composition. The formation of the hydrotalcite-like phase with the general formula Mg4Al2(CO3)1−x(OH)12+2x·nH2O proved to be the predominant route of dolomite consumption in the presence of available aluminium in the hardened cement paste. Then, after three months of ageing, an interlayer anions replacement became noticeable: carbonate anions in the structure of hydrotalcite are gradually replaced by hydroxide ones.","PeriodicalId":7122,"journal":{"name":"Acta Chimica Slovenica","volume":"16 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2023-09-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"136308286","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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