A cyclic voltammetric technique was used for electropolymerisation of proline on the surface of carbon paste electrode and for individual and concurrent determination of dopamine (DA) and uric acid (UA). The surface morphology of the developed electrode was studied by using field emission scanning electron microscopy. The modified electrode showed a high current response towards DA as compared to the bare electrode. The developed modified electrode shows good catalytic activity with a different oxidation potential of DA and UA. The electrode process was found to be adsorption controlled. The developed method shows very good stability and reproducibility. Under the optimized conditions, the concentration range is (1‒2)∙10-4 M and the observed detection limit was 4.7∙10-6 M. The developed sensor was applied for the determination of DA in the real sample with a good recovery.
{"title":"Electrochemical Determination of Dopamine and Uric Acid Using Poly(proline) Modified Carbon Paste Electrode: A Cyclic Voltammetric Study","authors":"E. Souza, J. G. Manjunatha, C. Raril","doi":"10.23939/CHCHT15.02.153","DOIUrl":"https://doi.org/10.23939/CHCHT15.02.153","url":null,"abstract":"A cyclic voltammetric technique was used for electropolymerisation of proline on the surface of carbon paste electrode and for individual and concurrent determination of dopamine (DA) and uric acid (UA). The surface morphology of the developed electrode was studied by using field emission scanning electron microscopy. The modified electrode showed a high current response towards DA as compared to the bare electrode. The developed modified electrode shows good catalytic activity with a different oxidation potential of DA and UA. The electrode process was found to be adsorption controlled. The developed method shows very good stability and reproducibility. Under the optimized conditions, the concentration range is (1‒2)∙10-4 M and the observed detection limit was 4.7∙10-6 M. The developed sensor was applied for the determination of DA in the real sample with a good recovery.","PeriodicalId":9793,"journal":{"name":"Chemistry & Chemical Technology","volume":null,"pages":null},"PeriodicalIF":0.9,"publicationDate":"2021-06-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"89514281","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}
Adsorption of nickel and chromium was investigated using fuller’s earth. The experimental data were analyzed using five 2-parameter adsorption models and three 3-parameter models. The maximum adsorption capacities for nickel and chromium were 769 and 556 mg/g, respectively. The Langmuir isotherm model was found to have the best fitting indicating monolayer adsorption. The adsorption was found to have an exothermic nature.
{"title":"Sustainable Adsorption Removal of Nickel and Chromium on Eco-Friendly Industrial Waste: Equilibrium Study","authors":"Y. Magdy, Hossam Altaher, A. A. Yaqout","doi":"10.23939/CHCHT15.02.161","DOIUrl":"https://doi.org/10.23939/CHCHT15.02.161","url":null,"abstract":"Adsorption of nickel and chromium was investigated using fuller’s earth. The experimental data were analyzed using five 2-parameter adsorption models and three 3-parameter models. The maximum adsorption capacities for nickel and chromium were 769 and 556 mg/g, respectively. The Langmuir isotherm model was found to have the best fitting indicating monolayer adsorption. The adsorption was found to have an exothermic nature.","PeriodicalId":9793,"journal":{"name":"Chemistry & Chemical Technology","volume":null,"pages":null},"PeriodicalIF":0.9,"publicationDate":"2021-06-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"76043659","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}
R. E. Demirdogen, T. Yeşilkaynak, Tetyana Tishakova, F. Emen
Pyridine (L1) and 2,4-dimethylpyridine (L2) halide complexes of the type of [ML2X2] were prepared and characterized via FT-IR and 1H NMR. The CA microfibers containing complexes were electrospun and investigated via FT-IR. The morphologies of the microfibers were investigated via FE-SEM. Antibacterial activities of the complexes and the fibers were investigated.
{"title":"Antibacterial Cellulose Acetate Microfibers Containing Pyridine Derivative Complexes","authors":"R. E. Demirdogen, T. Yeşilkaynak, Tetyana Tishakova, F. Emen","doi":"10.23939/CHCHT15.02.217","DOIUrl":"https://doi.org/10.23939/CHCHT15.02.217","url":null,"abstract":"Pyridine (L1) and 2,4-dimethylpyridine (L2) halide complexes of the type of [ML2X2] were prepared and characterized via FT-IR and 1H NMR. The CA microfibers containing complexes were electrospun and investigated via FT-IR. The morphologies of the microfibers were investigated via FE-SEM. Antibacterial activities of the complexes and the fibers were investigated.","PeriodicalId":9793,"journal":{"name":"Chemistry & Chemical Technology","volume":null,"pages":null},"PeriodicalIF":0.9,"publicationDate":"2021-06-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"87131278","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}
M. Benkartoussa, M. Lehocine, S. Arris, H.-A. Meniai
Adsorption of eriochrome black T (EBT) and rose bengal (RB) mixture from aqueous solutions was investigated using a mixture of low-cost biosorbents – 50 % of raw state potato peels and 50 % of raw state eggshell (M 50%). The surface charge distribution was determined by acid-base titration and the point of zero charge of the M 50% was found to be 8.5. The adsorbent materials were characterized by Fourier transform infrared spectroscopy and X-ray diffraction. It was confirmed that M 50% was mainly composed of calcite and cellulose. The effect of various operating parameters such as contact time, pH, temperature, etc., was studied. The amount of the adsorption decreased when solution pH increased. The pseudo-second order kinetic model provided the best fit to the experimental data for the adsorption of EBT and RB. The obtained thermodynamic parameters indicate that the adsorption process is endothermic one. According to the obtained results, the new biosorbent may be recommended as an industrial adsorbent for the treatment of effluents containing EBT and RB.
{"title":"Adsorption Removal of Eriochrome Black T (EBT) and Rose Bengal (RB) from Aqueous Solutions Using Bio-Sorbents Combination","authors":"M. Benkartoussa, M. Lehocine, S. Arris, H.-A. Meniai","doi":"10.23939/CHCHT15.02.299","DOIUrl":"https://doi.org/10.23939/CHCHT15.02.299","url":null,"abstract":"Adsorption of eriochrome black T (EBT) and rose bengal (RB) mixture from aqueous solutions was investigated using a mixture of low-cost biosorbents – 50 % of raw state potato peels and 50 % of raw state eggshell (M 50%). The surface charge distribution was determined by acid-base titration and the point of zero charge of the M 50% was found to be 8.5. The adsorbent materials were characterized by Fourier transform infrared spectroscopy and X-ray diffraction. It was confirmed that M 50% was mainly composed of calcite and cellulose. The effect of various operating parameters such as contact time, pH, temperature, etc., was studied. The amount of the adsorption decreased when solution pH increased. The pseudo-second order kinetic model provided the best fit to the experimental data for the adsorption of EBT and RB. The obtained thermodynamic parameters indicate that the adsorption process is endothermic one. According to the obtained results, the new biosorbent may be recommended as an industrial adsorbent for the treatment of effluents containing EBT and RB.","PeriodicalId":9793,"journal":{"name":"Chemistry & Chemical Technology","volume":null,"pages":null},"PeriodicalIF":0.9,"publicationDate":"2021-06-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"85243560","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}
O. Ivashchuk, A. Hlukhaniuk, Yevgen Semenyshyn, R. Chyzhovych, T. Kuzminchuk, S. Khomyak
The influence of the production conditions for rapeseed and soybean oils obtained by extraction in the system “solid – liquid” on the qualitative composition of the obtained vegetable oils has been studied. The main chemical values (acid value, iodine value, ester value, saponification value) and optical properties (refractometric refractive index and UV-Vis spectroscopy) for rapeseed and soybean oils obtained by extraction using methylene chloride as a solvent from different plant raw materials (grade of grinding is 0.2, 0.5 and 1.0 mm) and mixtures of crushed grain fractions have been determined. It has been shown that the grade of grinding of the raw material affects the quality of the obtained product.
{"title":"Influence of Extraction Conditions on Qualitative Composition of Vegetable Oils","authors":"O. Ivashchuk, A. Hlukhaniuk, Yevgen Semenyshyn, R. Chyzhovych, T. Kuzminchuk, S. Khomyak","doi":"10.23939/CHCHT15.02.233","DOIUrl":"https://doi.org/10.23939/CHCHT15.02.233","url":null,"abstract":"The influence of the production conditions for rapeseed and soybean oils obtained by extraction in the system “solid – liquid” on the qualitative composition of the obtained vegetable oils has been studied. The main chemical values (acid value, iodine value, ester value, saponification value) and optical properties (refractometric refractive index and UV-Vis spectroscopy) for rapeseed and soybean oils obtained by extraction using methylene chloride as a solvent from different plant raw materials (grade of grinding is 0.2, 0.5 and 1.0 mm) and mixtures of crushed grain fractions have been determined. It has been shown that the grade of grinding of the raw material affects the quality of the obtained product.","PeriodicalId":9793,"journal":{"name":"Chemistry & Chemical Technology","volume":null,"pages":null},"PeriodicalIF":0.9,"publicationDate":"2021-06-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"76405901","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}
This research studies the possibility on using a binary liquid mixture of bioethanol-water and biodiesel-water as fuel for a NSDC-LNSDCNSDC-L single fuel cell. The ratio of bioethanol-water was 70:30, as well as the ratio of biodiesel-water. The fuel vapor flowed into the fuel cell system under the temperatures of 673, 773 and 873 K with a flow rate of 1–1.5 ml•min-1. The highest power densities were found at 673 K which are 2.984 and 1.838 mW•cm-2 for bioethanol-water and biodiesel-water, respectively. It is a promising result for a single fuel cell test with a very low rate of liquid fuel flow. Meanwhile, open circuit voltage (OCV) of the single fuel cell with bioethanol-water fuel is 1.439 V which is close to the theoretical OCV. However, OCV of the single fuel cell with biodiesel-water as fuel is 0.710 V which is lower than the theoretical OCV. Cell polarization seems still being the problem causing voltage loss during single fuel cell test.
{"title":"A Binary Liquid Mixture of Bioethanol-Water and Biodiesel-Water as Fuel for NSDC-LNSDCNSDC-L Direct Ethanol-Solid Oxide Fuel Cell","authors":"F. Rahmawati, Arum Putri Parameswari","doi":"10.23939/CHCHT15.02.254","DOIUrl":"https://doi.org/10.23939/CHCHT15.02.254","url":null,"abstract":"This research studies the possibility on using a binary liquid mixture of bioethanol-water and biodiesel-water as fuel for a NSDC-LNSDCNSDC-L single fuel cell. The ratio of bioethanol-water was 70:30, as well as the ratio of biodiesel-water. The fuel vapor flowed into the fuel cell system under the temperatures of 673, 773 and 873 K with a flow rate of 1–1.5 ml•min-1. The highest power densities were found at 673 K which are 2.984 and 1.838 mW•cm-2 for bioethanol-water and biodiesel-water, respectively. It is a promising result for a single fuel cell test with a very low rate of liquid fuel flow. Meanwhile, open circuit voltage (OCV) of the single fuel cell with bioethanol-water fuel is 1.439 V which is close to the theoretical OCV. However, OCV of the single fuel cell with biodiesel-water as fuel is 0.710 V which is lower than the theoretical OCV. Cell polarization seems still being the problem causing voltage loss during single fuel cell test.","PeriodicalId":9793,"journal":{"name":"Chemistry & Chemical Technology","volume":null,"pages":null},"PeriodicalIF":0.9,"publicationDate":"2021-06-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"81692787","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}
V. Levytskyi, D. Katruk, Andriy Masyuk, Kh. V. Kysil, Mykhailo Bratychak Jr., Nataliia Chopyk
The influence of talc filler, its content, as well as an additional heat treatment and temperature on the regularities of polylactide materials water-absorption has been researched. Based on the obtained data, the water diffusion coefficient in polylactide materials and the activation energy of the diffusion process were determined. It was found that the process of water absorption by the filled and heat-treated materials based on polylactide proceeds slower and requires more activation energy of the process. Stability of the developed polylactide materials to acidic and alkaline media has been determined, in particular, it was found that the destruction of polylactide samples occurs faster in an alkaline medium than in an acidic one
{"title":"Resistance of Polylactide Materials to Water Mediums of the Various Natures","authors":"V. Levytskyi, D. Katruk, Andriy Masyuk, Kh. V. Kysil, Mykhailo Bratychak Jr., Nataliia Chopyk","doi":"10.23939/CHCHT15.02.191","DOIUrl":"https://doi.org/10.23939/CHCHT15.02.191","url":null,"abstract":"The influence of talc filler, its content, as well as an additional heat treatment and temperature on the regularities of polylactide materials water-absorption has been researched. Based on the obtained data, the water diffusion coefficient in polylactide materials and the activation energy of the diffusion process were determined. It was found that the process of water absorption by the filled and heat-treated materials based on polylactide proceeds slower and requires more activation energy of the process. Stability of the developed polylactide materials to acidic and alkaline media has been determined, in particular, it was found that the destruction of polylactide samples occurs faster in an alkaline medium than in an acidic one","PeriodicalId":9793,"journal":{"name":"Chemistry & Chemical Technology","volume":null,"pages":null},"PeriodicalIF":0.9,"publicationDate":"2021-06-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"74129296","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}
This paper presents the findings of research study on the effect of borosilicate glass wastes on properties of cement paste and mortar. The borosilicate glass contains three times less alkali than soda-lime glass and about 12 % of boron oxide, so pozzolanic activity of borosilicate glass is three times higher compared to soda-lime glass. In order to increase the pozzolanic activity of glass precipitated synthetic silica was used. Mathematical models were used in order to test the effect of synthetic silica on pozzolanic activity of borosilicate glass. Test results indicate that replacement of 1 % of borosilicate glass by synthetic silica increased the pozzolanic activity up to 9.4 mg CaO/g of additive. By adding 5 % of borosilicate glass instead of cement, the standard compressive strength is reduced by about 20 %. However, complex additive of borosilicate glass (2–5 %) and synthetic silica (0.5 %) increased initial compressive strength of cement mortars to 10 %.
{"title":"Effect of Borosilicate Glass Wastes and Synthetic Silica on Cement Products Properties","authors":"G. Kotsay, Petrochemistry, Aleksandra Brzóska","doi":"10.23939/CHCHT15.02.312","DOIUrl":"https://doi.org/10.23939/CHCHT15.02.312","url":null,"abstract":"This paper presents the findings of research study on the effect of borosilicate glass wastes on properties of cement paste and mortar. The borosilicate glass contains three times less alkali than soda-lime glass and about 12 % of boron oxide, so pozzolanic activity of borosilicate glass is three times higher compared to soda-lime glass. In order to increase the pozzolanic activity of glass precipitated synthetic silica was used. Mathematical models were used in order to test the effect of synthetic silica on pozzolanic activity of borosilicate glass. Test results indicate that replacement of 1 % of borosilicate glass by synthetic silica increased the pozzolanic activity up to 9.4 mg CaO/g of additive. By adding 5 % of borosilicate glass instead of cement, the standard compressive strength is reduced by about 20 %. However, complex additive of borosilicate glass (2–5 %) and synthetic silica (0.5 %) increased initial compressive strength of cement mortars to 10 %.","PeriodicalId":9793,"journal":{"name":"Chemistry & Chemical Technology","volume":null,"pages":null},"PeriodicalIF":0.9,"publicationDate":"2021-06-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"74959837","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}
I. Mobasherpour, Masomeh Javaherai, E. Salahi, M. Ebrahimi, Zahra Ashrafi, Y. Orooji
Removal of lead from aqueous solutions was studied using nanocomposite absorbent of bentonite/-alumina. The novel absorbent was characterized using XRD, FT-IR and SEM-EDX. Absorption process optimization using response surface methodology (RSM) and experimental design was performed with central composite design technique. The effects of Pb(II) initial concentration, adsorbent dosage, and composite percentage on Pb(II) removal percentage and adsorption capacity were examined. The adsorption capacity of 166.559 mg/g and removal % of 82.9887 with desirability equal to 0.763 were obtained for optimal initial concentration of 200 mg•l-1, adsorbent dosage of 0.5 mg•l-1, and composite percentage of 7.08 % determined using RSM design. The equilibrium adsorption data were investigated by Langmuir, Freundlich and Dubinin-Radushkevich isotherm models. It was found that Freundlich isotherm model fits better compared with other models.
{"title":"Removal of Pb(II) from Aqueous Solution by Ceramsite Prepared from Isfahan Bentonite and γ-Alumina","authors":"I. Mobasherpour, Masomeh Javaherai, E. Salahi, M. Ebrahimi, Zahra Ashrafi, Y. Orooji","doi":"10.23939/CHCHT15.02.263","DOIUrl":"https://doi.org/10.23939/CHCHT15.02.263","url":null,"abstract":"Removal of lead from aqueous solutions was studied using nanocomposite absorbent of bentonite/-alumina. The novel absorbent was characterized using XRD, FT-IR and SEM-EDX. Absorption process optimization using response surface methodology (RSM) and experimental design was performed with central composite design technique. The effects of Pb(II) initial concentration, adsorbent dosage, and composite percentage on Pb(II) removal percentage and adsorption capacity were examined. The adsorption capacity of 166.559 mg/g and removal % of 82.9887 with desirability equal to 0.763 were obtained for optimal initial concentration of 200 mg•l-1, adsorbent dosage of 0.5 mg•l-1, and composite percentage of 7.08 % determined using RSM design. The equilibrium adsorption data were investigated by Langmuir, Freundlich and Dubinin-Radushkevich isotherm models. It was found that Freundlich isotherm model fits better compared with other models.","PeriodicalId":9793,"journal":{"name":"Chemistry & Chemical Technology","volume":null,"pages":null},"PeriodicalIF":0.9,"publicationDate":"2021-06-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"85029912","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}
T. Lari, P. O. B. Z. I. Baluchestan, A. Mirzaei, H. Atashi, H. Bozorgzadeh
This study demonstrates the effect of operating conditions (Red-GHSV, inlet H2/CO, Oprat-GHSV) and the effect of Fe-Co-Ce nanocatalyst support. A statistical model using the response surface methodology (RSM) was applied with the target of achieving higher olefins selectivity in Fischer-Tropsch synthesis, which indicates the interaction effects of factors. The conditions under which three objectives optimization for maximizing olefins and minimizing paraffins and methane were determined. Synthesized nanocatalysts with various supports were characterized by XRD, SEM and TPR techniques
{"title":"A Modeling Study of Operating Conditions and Different Supports on Fe-Co-Ce Nanocatalyst and Optimizing of Light Olefins Selectivity in the Fischer-Tropsch Synthesis","authors":"T. Lari, P. O. B. Z. I. Baluchestan, A. Mirzaei, H. Atashi, H. Bozorgzadeh","doi":"10.23939/CHCHT15.02.170","DOIUrl":"https://doi.org/10.23939/CHCHT15.02.170","url":null,"abstract":"This study demonstrates the effect of operating conditions (Red-GHSV, inlet H2/CO, Oprat-GHSV) and the effect of Fe-Co-Ce nanocatalyst support. A statistical model using the response surface methodology (RSM) was applied with the target of achieving higher olefins selectivity in Fischer-Tropsch synthesis, which indicates the interaction effects of factors. The conditions under which three objectives optimization for maximizing olefins and minimizing paraffins and methane were determined. Synthesized nanocatalysts with various supports were characterized by XRD, SEM and TPR techniques","PeriodicalId":9793,"journal":{"name":"Chemistry & Chemical Technology","volume":null,"pages":null},"PeriodicalIF":0.9,"publicationDate":"2021-06-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"83101831","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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