Chemical Problems最新文献_第9页

ELECTROCHEMICAL SYNTHESIS OF IRON MONOSELENIDE THIN FILMS 电化学合成单硒化铁薄膜

Chemical Problems Pub Date : 2021-01-01 DOI: 10.32737/2221-8688-2021-4-262-271

A. Zeynalova, S. Javadova, V. Majidzade, A. Aliyev

引用次数: 2

ADDUCTS OF SUBSTITUTED VINYLOXYCYCLOPRFOPANES WITH THIOLS AS THERMOSTABILIZERS OF PVC 取代乙烯氧基环丙烷与硫醇的加合物作为PVC的热稳定剂

Chemical Problems Pub Date : 2021-01-01 DOI: 10.32737/2221-8688-2021-3-186-195

R. Shahnazarli

引用次数: 0

MOLECULAR COMPLEXES OF MONOAMMONIUM SALT OF GLYCYRRHIZIC ACID WITH SOME UREA AND THEIR ANTIBIOTIC ACTIVITY 甘草酸单铵盐与尿素的分子配合物及其抗菌活性

Chemical Problems Pub Date : 2021-01-01 DOI: 10.32737/2221-8688-2021-3-160-167

Y. Isaev, I. Askarov, S. Rustamov, D.U. Egamberdiev, K. Kushiev

引用次数: 8

COMPLEXES OF METALS WITH HYDRAZONE HYDRAZIDE SALICYLIC ACID 金属与肼肼水杨酸的配合物

Chemical Problems Pub Date : 2021-01-01 DOI: 10.32737/2221-8688-2021-2-79-83

P. A. Fatullayeva

引用次数: 0

SPECTROPHOTOMETRIC RESEARCH INTO INTERACTION NICKEL (II) WITH 1- (2- PYRIDYLAZO) -2- HYDROXY -4-MERCAPTOFENOL AND AMINOPHENOLS 镍与1-(2-吡啶偶氮)-2-羟基-4-巯基酚和氨基酚相互作用的分光光度法研究

Chemical Problems Pub Date : 2021-01-01 DOI: 10.32737/2221-8688-2021-3-150-159

A. Zalov, K. O. Isgenderova, Z.G. Askerova

{"title":"SPECTROPHOTOMETRIC RESEARCH INTO INTERACTION NICKEL (II) WITH 1- (2- PYRIDYLAZO) -2- HYDROXY -4-MERCAPTOFENOL AND AMINOPHENOLS","authors":"A. Zalov, K. O. Isgenderova, Z.G. Askerova","doi":"10.32737/2221-8688-2021-3-150-159","DOIUrl":"https://doi.org/10.32737/2221-8688-2021-3-150-159","url":null,"abstract":"The complexation reaction of nickel with 1-(2-pyridylazo)-2- hydroxy-4-mercaptophenol (PAGMP) in the presence of aminophenols (AP) was studied by spectrophotometric methods. Out of aminophenols there were used 2-(N,N-dimethylaminomethyl)-4-methylphenol and 2-(N, N-dimethylaminomethyl)-4- chlorophenol. We revealed optimum conditions for formation and extraction of differently ligand compounds and determined proportions of components in the complexes. It found that the complexes were formed in a weakly acidic environment (pH 3.5-6.5). The maximum in the light absorption spectrum is observed at λ=620-650 nm. The molar coefficient of light absorption is ε=(2.3-2.5)×104 . The optimal condition for the formation and extraction of these compounds is the concentration (1.2-1.5)×10-3 M PAGMP and (2.4- 2.6)×10-3 M AP. The maximum optical density is obtained within 15 minutes. Nickel МLC extracts with PAGMP and AF are subject to Beer's law at concentrations of 0.5–18 μg/ml. Proceeding from the results obtained, the photometric methods for the determination of nickel in water and soil were developed.","PeriodicalId":10015,"journal":{"name":"Chemical Problems","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2021-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"87714869","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}

引用次数: 3

PHOTO-CATALYSIS PROCESSES IN NON-REGULAR MEDIA 不规则介质中的光催化过程

Chemical Problems Pub Date : 2021-01-01 DOI: 10.32737/2221-8688-2021-1-7-17

T. Marsagishvili, G. D. Tatishvili, M. Matchavariani

{"title":"PHOTO-CATALYSIS PROCESSES IN NON-REGULAR MEDIA","authors":"T. Marsagishvili, G. D. Tatishvili, M. Matchavariani","doi":"10.32737/2221-8688-2021-1-7-17","DOIUrl":"https://doi.org/10.32737/2221-8688-2021-1-7-17","url":null,"abstract":"Technologies that cause the least harm to nature from global warming standpoint are becoming called-for. In this regard, photo-catalysis which uses the solar energy for chemical transformations of substances is of great interest for studying possible mechanisms of such processes. At the same time, the use of photo-catalysis significantly expands capabilities of the synthesis of new organic and inorganic materials. Charge phototransfer is always at the heart of photochemical transformations. Such processes can be considered from the point of view of quantum mechanics, and the probability of various mechanisms of the passing processes can be calculated using the apparatus of Green's functions. Analytical expressions for kinetic parameters of the charge transfer process between polyatomic particles in non-regular condensed medium and expressions for the extinction coefficient for appropriate processes of charge photo-transfer are obtained. Based on the analysis of obtained analytical expressions of dark and optical charge transfer processes, correlations between kinetic parameters of these processes are obtained. A methodology for determining kinetic parameters of the charge photo-transfer process on the basis of the shape of light absorption curve by means of the system functioning as the frequency of absorbed photons in various systems is presented. In this respect the general methodology has been applied to various specific processes. A methodology for determining the kinetic parameters of the charge phototransfer process from the shape of the light absorption curve by the system as a function of the frequency of absorbed photons in various systems is presented. The general methodology presented has been applied to various specific processes.","PeriodicalId":10015,"journal":{"name":"Chemical Problems","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2021-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"83638382","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}

引用次数: 0

SPECTROPHOTOMETRIC STUDY OF NICKEL (II) COMPLEXES WITH 2- HYDROXYTHIOLPHENOL AND ITS DERIVATIVES IN THE PRESENCE OF HYDROPHOBIC AMINES 在疏水胺存在下镍(ii)与2-羟基硫酚及其衍生物配合物的分光光度法研究

Chemical Problems Pub Date : 2021-01-01 DOI: 10.32737/2221-8688-2021-4-224-231

A. Zalov, K. O. Iskenderova, Z.G. Askerova, A. Hajiyeva

引用次数: 2

SPECTROPHOTOMETRIC RESEARCH INTO MULTI-LIGAND COMPLEXES FORMED BY ZIRCONIUM (IV) WITH STILBAZOLE AND CETYLPYRIDINIUM CHLORIDE 锆(iv)与二苯唑和十六烷基吡啶氯形成多配体配合物的分光光度法研究

Chemical Problems Pub Date : 2021-01-01 DOI: 10.32737/2221-8688-2021-4-241-249

I. Ahmadov, A. Pashajanov

引用次数: 0

DETERMINATION OF VANADIUM (V) TRACE AMOUNTS IN OIL SLUDGE AFTER PRELIMINARY CONCENTRATION WITH POLYMER SORBENT 高分子吸附剂初步浓缩后测定油泥中痕量钒

Chemical Problems Pub Date : 2021-01-01 DOI: 10.32737/2221-8688-2021-1-18-24

M. B. Hasanova, Azerbaijan State Oil, F. Bahmanova, F. Chiragov, C. I. Mirzai

{"title":"DETERMINATION OF VANADIUM (V) TRACE AMOUNTS IN OIL SLUDGE AFTER PRELIMINARY CONCENTRATION WITH POLYMER SORBENT","authors":"M. B. Hasanova, Azerbaijan State Oil, F. Bahmanova, F. Chiragov, C. I. Mirzai","doi":"10.32737/2221-8688-2021-1-18-24","DOIUrl":"https://doi.org/10.32737/2221-8688-2021-1-18-24","url":null,"abstract":"A modified sorbent based on copolymer of maleic anhydride with methacrylic acid was proposed for sorption of vanadium (V) concentration. A polymer chelating sorbent with fragments of para-amino salicylic acid was used in the work. Optimal sorption conditions were determined and the dependence of sorption capacity on the acidity of the solution studied. At pH 5, the degree of sorption attains its maximum. The effect of ionic strength on vanadium sorption was studied. Studies have shown that the ionic strength up to 0.6 mol/l does not affect the sorption, after 0.6 mol/l the increase in the ionic strength at the beginning gradually, and then sharply decreases the sorption. The effect of ionic strength on vanadium sorption was studied to show that the ionic strength up to 0.6 mol/l does not affect the sorption, and after 0.6 mol/l the increase in the ionic strength at the beginning gradually, and then sharply decreases the sorption. All further experiments were carried out in the solutions with an ionic strength of 0.6. It was found that as the concentration of vanadium rises in the solution, the amount of sorbed metal increases, and at a concentration of 8.10-3 mol/l it becomes maximum (pH = 5, CV5+ = 8.10-3 mol/l, vtotal = 20 ml, msorb. = 0.03 g, SC = 243 mg/g). The isotherm of vanadium (V) sorption with the synthesized sorbent was constructed. Sorption equilibrium is achieved within 1 hour of contact between the solution and the sorbent. Further growth in the sorption time does not change sorbent’s characteristics. The sorbent extracts vanadium (V) from solutions with a recovery rate of 93%. The effect of different mineral acids (HClO4, H2SO4, HNO3, HCl) of identical concentrations on vanadium (V) desorption from the sorbent was also studied. The results of the analysis showed that the maximum desorption of vanadium (V) occurs in perchlorate acid. The developed method was applied to determine the trace amounts of vanadium in oil sludge with preliminary concentration.","PeriodicalId":10015,"journal":{"name":"Chemical Problems","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2021-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"86315144","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}

引用次数: 0

DEPENDENCE OF Cr-Cu-O CATALYSTS ACTIVITY IN THE REACTION OF ETHANOL DEHYDROGENATION ON THEIR PHASE COMPOSITION 乙醇脱氢反应中Cr-Cu-O催化剂活性与相组成的关系

Chemical Problems Pub Date : 2021-01-01 DOI: 10.32737/2221-8688-2021-1-25-31

S. Mammadova, Azerbaijan State Oil, A. A. Ahmadova

{"title":"DEPENDENCE OF Cr-Cu-O CATALYSTS ACTIVITY IN THE REACTION OF ETHANOL DEHYDROGENATION ON THEIR PHASE COMPOSITION","authors":"S. Mammadova, Azerbaijan State Oil, A. A. Ahmadova","doi":"10.32737/2221-8688-2021-1-25-31","DOIUrl":"https://doi.org/10.32737/2221-8688-2021-1-25-31","url":null,"abstract":"The work deals with the reaction of ethanol conversion over chromium copper binary oxide catalysts. It showed that acetaldehyde is the main product of the ethanol conversion reaction. As the temperature rises, the direction of the ethanol conversion reaction shifts toward dehydration of ethanol into ethylene. Studies revealed that the atomic ratio of chromium to copper in the composition of the catalyst also has a strong effect on the activity of chromium-copper oxide catalysts. It established that samples with high chromium content in the composition of the catalyst display the greatest activity in the reaction of acetic aldehyde formation. So, on the sample Cr-Cu = 6-4, the yield of acetaldehyde reaches 82.5% with a selectivity of 97.6%. X-ray studies found that Cr-Cu-O catalysts consist mainly of initial oxides and in some samples indicate the chemical compound. X-ray studies showed that as the copper content decreases, the degree of crystallinity increases in the studied catalytic system. Comparison of the activity of Cr-Cu-O catalysts with their crystallinity degree revealed that the rise in crystallinity degree of chromium-copper oxide catalysts leads to the increase of acetic aldehyde yield and its selectivity in the ethanol conversion reaction.","PeriodicalId":10015,"journal":{"name":"Chemical Problems","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2021-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"84743045","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}

引用次数: 0