Pub Date : 2021-09-23DOI: 10.22075/CHEM.2020.18967.1736
Ali M. Kermani, A. Ahmadpour, T. R. Bastami
The presence of sulfur-containing compounds in fossil fuels has been considered as major source of SOx. Oxidative desulfurization (ODS) is recognized as a promising process to remove sulfur compounds in fossil fuels. Furthermore, in recent years, polyoxometalates (POMs), renowned as green catalysts, have attracted worldwide attention for their high efficiency in ODS. In this research, activated carbon (AC) supported dawson type hetero-polyoxometalate composite has been synthesized and evaluated as a new catalyst in oxidative desulfurization of model fuel containing dibenzothiophene. The prepared Dawson/AC catalysts were analyzed using FTIR, XRD, SEM. In order to optimize the operating conditions of ODS using Dawson/AC as catalyst, three conditions such as temperature, catalyst dosage and oxidant dosage were studied. Under optimized conditions, sulfur removal up to 99.2% or even higher than that using Dawson/AC composite as catalyst in ODS can be achieved.
{"title":"Synthesis of Dawson Hetero-Polyoxometalate/Activated Carbon Composite and evaluation of its catalytic application for Oxidative removal of Dibenzothiophene","authors":"Ali M. Kermani, A. Ahmadpour, T. R. Bastami","doi":"10.22075/CHEM.2020.18967.1736","DOIUrl":"https://doi.org/10.22075/CHEM.2020.18967.1736","url":null,"abstract":"The presence of sulfur-containing compounds in fossil fuels has been considered as major source of SOx. Oxidative desulfurization (ODS) is recognized as a promising process to remove sulfur compounds in fossil fuels. Furthermore, in recent years, polyoxometalates (POMs), renowned as green catalysts, have attracted worldwide attention for their high efficiency in ODS. In this research, activated carbon (AC) supported dawson type hetero-polyoxometalate composite has been synthesized and evaluated as a new catalyst in oxidative desulfurization of model fuel containing dibenzothiophene. The prepared Dawson/AC catalysts were analyzed using FTIR, XRD, SEM. In order to optimize the operating conditions of ODS using Dawson/AC as catalyst, three conditions such as temperature, catalyst dosage and oxidant dosage were studied. Under optimized conditions, sulfur removal up to 99.2% or even higher than that using Dawson/AC composite as catalyst in ODS can be achieved.","PeriodicalId":7954,"journal":{"name":"Applied Chemistry","volume":"7 1","pages":"63-78"},"PeriodicalIF":0.0,"publicationDate":"2021-09-23","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"84679797","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 : 2021-09-23DOI: 10.22075/CHEM.2020.20581.1855
Mona Besharat, Samira Arab-Salmanabadi, O. Moradi
Synthesis and study of the medicinal properties of new spiro compounds with various functional groups is of great interest to organic and pharmaceutical researchers because of their special structure and conformation. Multi-component reactions are one of the most popular methods for synthesis of these compounds. In this study, the three-component reaction between butyl amine, dimethyl acetylene carboxylate, and 1H-indene-1,2,3-trione in toluene reflux conditions, is described. The three rings heterocyclic Spiro furan was successfully synthesized and characterized by FTIR, 1H-NMR, 13C-NMR, and Mass spectrometry. Then during the cytotoxic studies, its anticancer properties were performed on the G-292 cancer cell lines via the MTT assay and the results were reasonable.
{"title":"Synthesis and Characterization of a Three Rings Heterocyclic Spiro Furan and Evaluation of its Cytotoxicity Properties on G-292 Cell Lines","authors":"Mona Besharat, Samira Arab-Salmanabadi, O. Moradi","doi":"10.22075/CHEM.2020.20581.1855","DOIUrl":"https://doi.org/10.22075/CHEM.2020.20581.1855","url":null,"abstract":"Synthesis and study of the medicinal properties of new spiro compounds with various functional groups is of great interest to organic and pharmaceutical researchers because of their special structure and conformation. Multi-component reactions are one of the most popular methods for synthesis of these compounds. In this study, the three-component reaction between butyl amine, dimethyl acetylene carboxylate, and 1H-indene-1,2,3-trione in toluene reflux conditions, is described. The three rings heterocyclic Spiro furan was successfully synthesized and characterized by FTIR, 1H-NMR, 13C-NMR, and Mass spectrometry. Then during the cytotoxic studies, its anticancer properties were performed on the G-292 cancer cell lines via the MTT assay and the results were reasonable.","PeriodicalId":7954,"journal":{"name":"Applied Chemistry","volume":"15 1","pages":"25-36"},"PeriodicalIF":0.0,"publicationDate":"2021-09-23","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"90394995","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 : 2021-09-18DOI: 10.22075/CHEM.2021.24019.1998
Zahra Negaresh, M. Fazli
The adsorption of carbon dioxide molecules on four H-saturated porous graphene sheets with different pore sizes and a poreless graphene sheet was investigated and compared with the adsorption of nitrogen molecules on them. Reactive molecular dynamics was used in this study, which took into account the possibility of chemical bond formation and dissociation as well as the effects of polarity. This research demonstrates that all porous graphene sheets and non-cavity graphene sheets absorb carbon dioxide molecules more than nitrogen molecules and can be used to separate these two gases. However, the size and shape of the cavities have no significant impact on gas molecule adsorption on these plates.
{"title":"Study of carbon dioxide adsorption on H-saturated porous graphene sheet and its separation from nitrogen using functional density theory and reactive molecular dynamics","authors":"Zahra Negaresh, M. Fazli","doi":"10.22075/CHEM.2021.24019.1998","DOIUrl":"https://doi.org/10.22075/CHEM.2021.24019.1998","url":null,"abstract":"The adsorption of carbon dioxide molecules on four H-saturated porous graphene sheets with different pore sizes and a poreless graphene sheet was investigated and compared with the adsorption of nitrogen molecules on them. Reactive molecular dynamics was used in this study, which took into account the possibility of chemical bond formation and dissociation as well as the effects of polarity. This research demonstrates that all porous graphene sheets and non-cavity graphene sheets absorb carbon dioxide molecules more than nitrogen molecules and can be used to separate these two gases. However, the size and shape of the cavities have no significant impact on gas molecule adsorption on these plates.","PeriodicalId":7954,"journal":{"name":"Applied Chemistry","volume":"134 1","pages":"23-38"},"PeriodicalIF":0.0,"publicationDate":"2021-09-18","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"80295700","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 : 2021-09-14DOI: 10.22075/CHEM.2021.23480.1976
Elnaz Kazemi, H. Aghaei
In this paper, the immobilization of lipase from Candida rugosa on hydrophilic Na-montmorillonite (MT) and hydrophobic modified montmorillonite (MTS) is investigated. Hydrophobic MTS was prepared by changing the nature of hydrophilic MT with cetrimonium bromide surfactant. The enzymatic activity of lipase immobilized on Na-montmorillonite (LMT) and lipase immobilized on modified montmorillonite (LMTS) was investigated in the production of biodiesel from waste cooking oil. The support modification and enzyme immobilization were evaluated by BET, XRD, and SEM techniques. The effects of temperature, time, water content, and the molar ratio of methanol to oil on biodiesel yield were also investigated. The results showed that the activity of LMTS was much better than LMT. Under optimal conditions, the biodiesel yield produced by LMTS was about 86.4%. LMTS showed good storage stability, and after 30 days of storage at 4 ℃, the biodiesel yield was about 64.2%, while the biodiesel yield of free lipase (FL) was about 57.1%. In addition, LMTS had good reusability compared to LMT, and the biodiesel yield after 10 cycles was about 51.6%.
{"title":"Immobilization of lipase on Na-montmorillonite and modified montmorillonite: Investigation of biocatalytic activity of immobilized lipases in biodiesel production from waste cooking oil","authors":"Elnaz Kazemi, H. Aghaei","doi":"10.22075/CHEM.2021.23480.1976","DOIUrl":"https://doi.org/10.22075/CHEM.2021.23480.1976","url":null,"abstract":"In this paper, the immobilization of lipase from Candida rugosa on hydrophilic Na-montmorillonite (MT) and hydrophobic modified montmorillonite (MTS) is investigated. Hydrophobic MTS was prepared by changing the nature of hydrophilic MT with cetrimonium bromide surfactant. The enzymatic activity of lipase immobilized on Na-montmorillonite (LMT) and lipase immobilized on modified montmorillonite (LMTS) was investigated in the production of biodiesel from waste cooking oil. The support modification and enzyme immobilization were evaluated by BET, XRD, and SEM techniques. The effects of temperature, time, water content, and the molar ratio of methanol to oil on biodiesel yield were also investigated. The results showed that the activity of LMTS was much better than LMT. Under optimal conditions, the biodiesel yield produced by LMTS was about 86.4%. LMTS showed good storage stability, and after 30 days of storage at 4 ℃, the biodiesel yield was about 64.2%, while the biodiesel yield of free lipase (FL) was about 57.1%. In addition, LMTS had good reusability compared to LMT, and the biodiesel yield after 10 cycles was about 51.6%.","PeriodicalId":7954,"journal":{"name":"Applied Chemistry","volume":"241 1","pages":"9-22"},"PeriodicalIF":0.0,"publicationDate":"2021-09-14","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"75577724","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 : 2021-03-21DOI: 10.22075/CHEM.2020.19771.1799
Fariba Mohseni, Niloufar Akbarzadeh Torbati, T. Kondori
In this study, nickel oxide nanoparticles was prepared by co-precipitation method and characterized using FT-IR, XRD, VSM and SEM techniques. By Fourier transform infrared FT-IR has proven bond forming of NiO in nickel oxide. . X-ray diffraction (XRD) showed that the single-phase sample had a cubic symmetry with a particle size of 57 nm. Nickel oxide nanoparticles can be prepared as an efficient adsorbent for the removal of food color in aqueous solution. The highest removal percentage of food color, was in pH=7 and it,s concentration was 15 ppm. The obtained experimental data in optimum condition was used to model the behavior of absorption in isotherms equations such as: Langmuir, Freundlich, Langmuir-Freundlich and Toth. An examination of the Langmuer isotherm (R2=0.980) showed that the absorption of food color on the adsorbent surface was monolithic and uniform. The kinetics of adsorption interactions were examined. The obtained results showed that the adsorption data has the most conformity with, pseudo-second-order model.
{"title":"Kinetics and isotherm investigation of adsorption process of nickel oxide nanoparticles in edible dye removal from industrial effluent","authors":"Fariba Mohseni, Niloufar Akbarzadeh Torbati, T. Kondori","doi":"10.22075/CHEM.2020.19771.1799","DOIUrl":"https://doi.org/10.22075/CHEM.2020.19771.1799","url":null,"abstract":"In this study, nickel oxide nanoparticles was prepared by co-precipitation method and characterized using FT-IR, XRD, VSM and SEM techniques. By Fourier transform infrared FT-IR has proven bond forming of NiO in nickel oxide. . X-ray diffraction (XRD) showed that the single-phase sample had a cubic symmetry with a particle size of 57 nm. Nickel oxide nanoparticles can be prepared as an efficient adsorbent for the removal of food color in aqueous solution. The highest removal percentage of food color, was in pH=7 and it,s concentration was 15 ppm. The obtained experimental data in optimum condition was used to model the behavior of absorption in isotherms equations such as: Langmuir, Freundlich, Langmuir-Freundlich and Toth. An examination of the Langmuer isotherm (R2=0.980) showed that the absorption of food color on the adsorbent surface was monolithic and uniform. The kinetics of adsorption interactions were examined. The obtained results showed that the adsorption data has the most conformity with, pseudo-second-order model.","PeriodicalId":7954,"journal":{"name":"Applied Chemistry","volume":"13 1","pages":"333-348"},"PeriodicalIF":0.0,"publicationDate":"2021-03-21","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"75302000","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 : 2021-03-21DOI: 10.22075/CHEM.2020.20112.1819
Marzieh Yaghoubi-berijani, B. Bahramian
Abstract One important topic to recovery the photocatalytic process is to prevent the recombination of electrons and holes generated by light excitation of the photocatalyst. Different strategies have been used such as a composite of compounds is an appropriative way to reduce the recombination. On the other hand, to optimize the use of visible light , components can composite with visible active components. In this article, to more using solar light and more activation of composite in visible light, sensitization with porphyrin and tin porphyrin complex was carried out. As a result, we reported on the synthesis of BiOBr/Ag@TCPP and BiOBr/Ag@SnTCPP nanocomposites. The nanocomposites were characterized by the XRD, FT-IR, FE-SEM equipped with EDS, Raman, and UV–vis DRS analytical techniques. Furthermore, the photocatalytic activity of nanocomposites sensitized with porphyrin for photodegradation of methyl orange (MO) as model organic pollutant were investigated. The maximum degradation efficiency of 95% is achieved under visible light irradiation in 240 min. The photocatalytic performance of BiOBr/Ag@TCPP and BiOBr/Ag@SnTCPP nanocomposites is much higher than that of BiOBr/Ag.
{"title":"Synthesis, design and use of new BiOBr/Ag@TCPP and BiOBr/Ag@SnTCPP nanocomposites for degradation of dye pollutant","authors":"Marzieh Yaghoubi-berijani, B. Bahramian","doi":"10.22075/CHEM.2020.20112.1819","DOIUrl":"https://doi.org/10.22075/CHEM.2020.20112.1819","url":null,"abstract":"Abstract One important topic to recovery the photocatalytic process is to prevent the recombination of electrons and holes generated by light excitation of the photocatalyst. Different strategies have been used such as a composite of compounds is an appropriative way to reduce the recombination. On the other hand, to optimize the use of visible light , components can composite with visible active components. In this article, to more using solar light and more activation of composite in visible light, sensitization with porphyrin and tin porphyrin complex was carried out. As a result, we reported on the synthesis of BiOBr/Ag@TCPP and BiOBr/Ag@SnTCPP nanocomposites. The nanocomposites were characterized by the XRD, FT-IR, FE-SEM equipped with EDS, Raman, and UV–vis DRS analytical techniques. Furthermore, the photocatalytic activity of nanocomposites sensitized with porphyrin for photodegradation of methyl orange (MO) as model organic pollutant were investigated. The maximum degradation efficiency of 95% is achieved under visible light irradiation in 240 min. The photocatalytic performance of BiOBr/Ag@TCPP and BiOBr/Ag@SnTCPP nanocomposites is much higher than that of BiOBr/Ag.","PeriodicalId":7954,"journal":{"name":"Applied Chemistry","volume":"13 1","pages":"287-306"},"PeriodicalIF":0.0,"publicationDate":"2021-03-21","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"90303996","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 : 2021-03-21DOI: 10.22075/CHEM.2020.19363.1773
M. Moosavi, Niaz Monadi, M. Mohseni
In the study, reaction of the 4-methoxy salicylaldehyde 2-aminobenzoylhydrazone(H2L) with MoO2(acac)2 formed a 5-coordinate Molybdenum(VI) complex [MoO2L]. The synthesized complex and its ligand were characterized with various techniques such as NMR, UV-Vis, FT-IR Spectroscopy and elemental analysis (CHN). Molecular structure of Mo(VI) complex is determined by X-ray crystallography , indicating the dianionic tridentate. The crystallographic data revealed a distorted square-pyramidal geometry.The biological activities of Schiff base ligand, H2L, and the biological role of Mo(VI) metal ion in vitro conditions against four strains of bacterial standard Gram positive and Gram negative investigated. The results indicated that the highest antibacterial activity against Escherichia coli was related to the MoO2L complex. The results of the present study showed that the complex had a stronger antibacterial activity than ligand.
{"title":"Synthesis and characterization of Molybdenum(VI) complex with 4-methoxy Salicylaldehyde 2-aminobenzoylhydrazon and investigation of their antibacterial activity","authors":"M. Moosavi, Niaz Monadi, M. Mohseni","doi":"10.22075/CHEM.2020.19363.1773","DOIUrl":"https://doi.org/10.22075/CHEM.2020.19363.1773","url":null,"abstract":"In the study, reaction of the 4-methoxy salicylaldehyde 2-aminobenzoylhydrazone(H2L) with MoO2(acac)2 formed a 5-coordinate Molybdenum(VI) complex [MoO2L]. The synthesized complex and its ligand were characterized with various techniques such as NMR, UV-Vis, FT-IR Spectroscopy and elemental analysis (CHN). Molecular structure of Mo(VI) complex is determined by X-ray crystallography , indicating the dianionic tridentate. The crystallographic data revealed a distorted square-pyramidal geometry.The biological activities of Schiff base ligand, H2L, and the biological role of Mo(VI) metal ion in vitro conditions against four strains of bacterial standard Gram positive and Gram negative investigated. The results indicated that the highest antibacterial activity against Escherichia coli was related to the MoO2L complex. The results of the present study showed that the complex had a stronger antibacterial activity than ligand.","PeriodicalId":7954,"journal":{"name":"Applied Chemistry","volume":"173 1","pages":"183-198"},"PeriodicalIF":0.0,"publicationDate":"2021-03-21","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"89918869","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 : 2021-03-21DOI: 10.22075/CHEM.2020.19583.1787
Fatemeh Sadeghi, Hashem Shahroosvand, N. Mohammadi, Mohammadreza Maleki
مواد انتقالدهنده حفره از اجزای بسیار مهم یک سلول خورشیدی پروسکایتی به شمار میروند، بهنحوی که حضور آنها یک مولفه کلیدی برای دستیابی به بازدهی بالا در تبدیل نور خورشید به الکتریسیته محسوب میشود. از اینرو جستجو برای پیدا کردن انتقالدهنده های حفره جدید، کارآمد و کمهزینه برای استفاده در سلولهای خورشیدی پروسکایتی از داغترین موضوعهای پژوهشی در قلمرو سلولهای خورشیدی به شمار میرود. در این مقاله، نسل جدیدی از انتقالدهندههای حفره آلی به منظور استفاده در سلولهای خورشیدی پروسکایتی، تهیه و معرفی شده است. انتقالدهنده حفره آلی دوهسته-ای bis(4-(4,5-diphenyl-2-(p-tolyl)-4,5-dihydro-1H-imidazol-1-yl)phenyl)methane که با نام اختصاری MDA-PI2 معرفی میشود، بر پایه بنزیلایمیدازولها سنتز و شناسایی شد و سرانجام به عنوان ماده انتقالدهنده حفره آلی دوهستهای در سلول خورشیدی پروسکایتی مورد استفاده قرار گرفت . از آنجا که ویژگیهای فوتو فیزیکی، فوتو شیمیایی و الکتروشیمیایی انتقالدهندههای حفره نقش بسیار مهمی را در بهبود عملکرد یک سلول خورشیدی پروسکایتی بازی میکنند به بررسی آنالیزهای مختلفی از جمله ولتامتری چرخهای، پایداری حرارتی، فوتولومینسانس، زاویه تماسی آب پرداخته شد که همگی گویای عملکرد مطلوب انتقالدهنده حفره جدید سنتز شده در یک سلول خورشیدی پروسکایتی بودند. همچنین، میزان فرونشانی فعالیت نشری انتقال دهنده حفره جدید بسیار نزدیک به نمونه مرجع Spiro-OMeTAD در حضور لایه جاذب پروسکایتی بود که نشان از انتقال موثر حفرهها در سلول خورشیدی پروسکایتی میباشد. پس از ساخت سلول خورشیدی پروسکایتی بدون انتقال دهنده حفره و بر پایه انتقال دهنده حفره جدید، میزان بازده سلول خورشیدی پروسکایتی ، از مقدار 1/57 درصد در غیاب انتقالدهنده حفره، به مقدار 6/60 درصد در حضور انتقالدهنده حفره جدید افزایش پیدا کرد که نشاندهنده عملکرد خوب انتقالدهندههای حفره بر پایه حلقه های ایمیدازولی است .
{"title":"سلول خورشیدی پروسکایتی ارزان قیمت بر پایه انتقال دهنده حفره ایمیدازولی","authors":"Fatemeh Sadeghi, Hashem Shahroosvand, N. Mohammadi, Mohammadreza Maleki","doi":"10.22075/CHEM.2020.19583.1787","DOIUrl":"https://doi.org/10.22075/CHEM.2020.19583.1787","url":null,"abstract":"مواد انتقالدهنده حفره از اجزای بسیار مهم یک سلول خورشیدی پروسکایتی به شمار میروند، بهنحوی که حضور آنها یک مولفه کلیدی برای دستیابی به بازدهی بالا در تبدیل نور خورشید به الکتریسیته محسوب میشود. از اینرو جستجو برای پیدا کردن انتقالدهنده های حفره جدید، کارآمد و کمهزینه برای استفاده در سلولهای خورشیدی پروسکایتی از داغترین موضوعهای پژوهشی در قلمرو سلولهای خورشیدی به شمار میرود. در این مقاله، نسل جدیدی از انتقالدهندههای حفره آلی به منظور استفاده در سلولهای خورشیدی پروسکایتی، تهیه و معرفی شده است. انتقالدهنده حفره آلی دوهسته-ای bis(4-(4,5-diphenyl-2-(p-tolyl)-4,5-dihydro-1H-imidazol-1-yl)phenyl)methane که با نام اختصاری MDA-PI2 معرفی میشود، بر پایه بنزیلایمیدازولها سنتز و شناسایی شد و سرانجام به عنوان ماده انتقالدهنده حفره آلی دوهستهای در سلول خورشیدی پروسکایتی مورد استفاده قرار گرفت . از آنجا که ویژگیهای فوتو فیزیکی، فوتو شیمیایی و الکتروشیمیایی انتقالدهندههای حفره نقش بسیار مهمی را در بهبود عملکرد یک سلول خورشیدی پروسکایتی بازی میکنند به بررسی آنالیزهای مختلفی از جمله ولتامتری چرخهای، پایداری حرارتی، فوتولومینسانس، زاویه تماسی آب پرداخته شد که همگی گویای عملکرد مطلوب انتقالدهنده حفره جدید سنتز شده در یک سلول خورشیدی پروسکایتی بودند. همچنین، میزان فرونشانی فعالیت نشری انتقال دهنده حفره جدید بسیار نزدیک به نمونه مرجع Spiro-OMeTAD در حضور لایه جاذب پروسکایتی بود که نشان از انتقال موثر حفرهها در سلول خورشیدی پروسکایتی میباشد. پس از ساخت سلول خورشیدی پروسکایتی بدون انتقال دهنده حفره و بر پایه انتقال دهنده حفره جدید، میزان بازده سلول خورشیدی پروسکایتی ، از مقدار 1/57 درصد در غیاب انتقالدهنده حفره، به مقدار 6/60 درصد در حضور انتقالدهنده حفره جدید افزایش پیدا کرد که نشاندهنده عملکرد خوب انتقالدهندههای حفره بر پایه حلقه های ایمیدازولی است .","PeriodicalId":7954,"journal":{"name":"Applied Chemistry","volume":"6 1","pages":"257-272"},"PeriodicalIF":0.0,"publicationDate":"2021-03-21","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"75469217","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 : 2021-03-21DOI: 10.22075/CHEM.2020.18729.1712
A. Zare, Nesa Lotfifar
In this research, a novel material namely N,N,N',N'-tetramethylethylenediaminium-N-(silica-n-propyl)-N'-sulfonic acid chloride trifluoroacetate ([TEDSPSCT]) was synthesized, and its structure was characterized using Fourier-transform infrared spectroscopy (FT-IR), energy-dispersive X-ray (EDS), field emission scanning electron microscopy (FE-SEM), thermal gravimetric (TG), differential thermal gravimetric (DTG) and x-ray diffraction (XRD); most of the partcles were in nano-size, and a few of them were in micro-size. Afterward, [TEDSPSCT] was used as effective and recyclable catalyst for the preparation of bis-coumarins via the reaction of 4-hydroxycoumarin (2 equivalents) with arylaldehydes (1 equivalent) under solvent-free conditions; these compounds were obtained in high yields and short reaction times. Moreover, an attractive and logical mechanism based on dual-functionality of the catalyst has been described {this catalyst has both acidic group (SO3H) and weak basic group (trifluoroacetate)}.
{"title":"Synthesis, characterization and application of N,N,N',N'-tetramethylethylenediaminium-N-(silica-n-propyl)-N'-sulfonic acid chloride trifluoroacetate as a novel and effective catalyst for preparation of bis-coumarins","authors":"A. Zare, Nesa Lotfifar","doi":"10.22075/CHEM.2020.18729.1712","DOIUrl":"https://doi.org/10.22075/CHEM.2020.18729.1712","url":null,"abstract":"In this research, a novel material namely N,N,N',N'-tetramethylethylenediaminium-N-(silica-n-propyl)-N'-sulfonic acid chloride trifluoroacetate ([TEDSPSCT]) was synthesized, and its structure was characterized using Fourier-transform infrared spectroscopy (FT-IR), energy-dispersive X-ray (EDS), field emission scanning electron microscopy (FE-SEM), thermal gravimetric (TG), differential thermal gravimetric (DTG) and x-ray diffraction (XRD); most of the partcles were in nano-size, and a few of them were in micro-size. Afterward, [TEDSPSCT] was used as effective and recyclable catalyst for the preparation of bis-coumarins via the reaction of 4-hydroxycoumarin (2 equivalents) with arylaldehydes (1 equivalent) under solvent-free conditions; these compounds were obtained in high yields and short reaction times. Moreover, an attractive and logical mechanism based on dual-functionality of the catalyst has been described {this catalyst has both acidic group (SO3H) and weak basic group (trifluoroacetate)}.","PeriodicalId":7954,"journal":{"name":"Applied Chemistry","volume":"132 1","pages":"167-182"},"PeriodicalIF":0.0,"publicationDate":"2021-03-21","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"86329813","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 : 2021-03-21DOI: 10.22075/CHEM.2020.18853.1727
Shayesteh Kokabi, M. Jabbari, Seyyed Ahmad Nabavi-Amri, M. Zamani
Ascorbic acid is known as an important vitamin antioxidant, which has many role in the health of body cells. In this research, for the first time has been used from the quartz crystal micro-balance (QCM) technique to determine the antioxidant capacity of ascorbic acid against TEMPO radical scavenging in different concentrations in binary mixture of water-ethanol (1:2 v/v) at room temperature. In this technique, the mass changes on the quartz crystal covered by gold layer and modified by the cysteine are measured using the changes of vibrational frequency. The antioxidant capacity was measured based on the radical adsorption on the modified layer of crystal. Changes in frequency were observed proportional to the mass of the absorbed TEMPO radical. The obtained results indicate that the scavenging property of ascorbic acid is increased by increasing the concentration of TEMPO free radical. Finally, the adsorption process of TEMPO radical was evaluated by using Langmuir and Freundlich models. It was found that the adsorption of TEMPO radical on the surface of crystal follows the Langmuir isotherm.
{"title":"Measurement of antioxidant capacity of ascorbic acid against TEMPO radical scavenging using the quartz crystal micro-balance as a novel technique","authors":"Shayesteh Kokabi, M. Jabbari, Seyyed Ahmad Nabavi-Amri, M. Zamani","doi":"10.22075/CHEM.2020.18853.1727","DOIUrl":"https://doi.org/10.22075/CHEM.2020.18853.1727","url":null,"abstract":"Ascorbic acid is known as an important vitamin antioxidant, which has many role in the health of body cells. In this research, for the first time has been used from the quartz crystal micro-balance (QCM) technique to determine the antioxidant capacity of ascorbic acid against TEMPO radical scavenging in different concentrations in binary mixture of water-ethanol (1:2 v/v) at room temperature. In this technique, the mass changes on the quartz crystal covered by gold layer and modified by the cysteine are measured using the changes of vibrational frequency. The antioxidant capacity was measured based on the radical adsorption on the modified layer of crystal. Changes in frequency were observed proportional to the mass of the absorbed TEMPO radical. The obtained results indicate that the scavenging property of ascorbic acid is increased by increasing the concentration of TEMPO free radical. Finally, the adsorption process of TEMPO radical was evaluated by using Langmuir and Freundlich models. It was found that the adsorption of TEMPO radical on the surface of crystal follows the Langmuir isotherm.","PeriodicalId":7954,"journal":{"name":"Applied Chemistry","volume":"59 1","pages":"307-318"},"PeriodicalIF":0.0,"publicationDate":"2021-03-21","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"77915005","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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