Turkish Journal of Chemistry最新文献_第2页

β-Ketoenamine-linked covalent organic framework for efficient iodine capture. 用于高效捕获碘的β-酮胺连接共价有机框架。

IF 1.3 4区化学

Turkish Journal of Chemistry Pub Date : 2024-06-15 eCollection Date: 2024-01-01 DOI: 10.55730/1300-0527.3684

Onur Büyükçakir

{"title":"β-Ketoenamine-linked covalent organic framework for efficient iodine capture.","authors":"Onur Büyükçakir","doi":"10.55730/1300-0527.3684","DOIUrl":"https://doi.org/10.55730/1300-0527.3684","url":null,"abstract":"Exploring the materials that effectively capture radioactive iodine is crucial in managing nuclear waste produced from nuclear power plants. In this study, a β-ketoenamine-linked covalent organic framework (bCOF) is reported as an effective adsorbent to capture iodine from both vapor and solution. The bCOF's high porosity and heteroatom-rich skeleton offer notable iodine vapor uptake capacity of up to 2.51 g g-1 at 75 °C under ambient pressure. Furthermore, after five consecutive adsorption-desorption cycles, the bCOF demonstrates high reusability performance with significant iodine vapor capacity retention. The adsorption mechanism was also investigated using various ex situ structural characterization techniques, and these mechanistic studies revealed the existence of a strong chemical interaction between the bCOF and iodine. The bCOF also showed good iodine uptake performance of up to 512 mg g-1 in cyclohexane with high removal efficiencies. The bCOF's performance in adsorbing iodine from both vapor and solution makes it a promising material to be used as an effective adsorbent in capturing radioactive iodine emissions from nuclear power plants.","PeriodicalId":23367,"journal":{"name":"Turkish Journal of Chemistry","volume":"48 4","pages":"631-642"},"PeriodicalIF":1.3,"publicationDate":"2024-06-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://www.ncbi.nlm.nih.gov/pmc/articles/PMC11407363/pdf/","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142296500","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"化学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

LaCoO₃ is a promising catalyst for the dry reforming of benzene used as a surrogate of biomass tar. LaCoO3 是一种很有前途的催化剂，可用于作为生物质焦油替代物的苯的干转化。

IF 1.3 4区化学

Turkish Journal of Chemistry Pub Date : 2024-06-15 eCollection Date: 2024-01-01 DOI: 10.55730/1300-0527.3685

Başar Çağlar, Deniz Üner

{"title":"LaCoO3 is a promising catalyst for the dry reforming of benzene used as a surrogate of biomass tar.","authors":"Başar Çağlar, Deniz Üner","doi":"10.55730/1300-0527.3685","DOIUrl":"https://doi.org/10.55730/1300-0527.3685","url":null,"abstract":"Tar build-up is one of the bottlenecks of biomass gasification processes. Dry reforming of tar is an alternative solution if the oxygen chemical potential on the catalyst surface is at a sufficient level. For this purpose, an oxygen-donor perovskite, LaCoO3, was used as a catalyst for the dry reforming of tar. To circumvent the complexity of the tar and its constituents, the benzene molecule was chosen as a model compound. Dry reforming of benzene vapor on the LaCoO3 catalyst was investigated at temperatures of 600, 700, and 800 °C; at CO2/C6H6 ratios of 3, 6, and 12; and at space velocities of 14,000 and 28,000 h-1. The conventional Ni(15 wt.%)/Al2O3 catalyst was also used as a reference material to determine the relative activity of the LaCoO3 catalyst. Different characterization techniques such as X-ray diffraction, N2 adsorption-desorption, temperature-programmed reduction, and oxidation were used to determine the physicochemical characteristics of the catalysts. The findings demonstrated that the LaCoO3 catalyst has higher CO2 conversion, higher H2 and CO yields, and better stability than the Ni(15 wt.%)/γ-Al2O3 catalyst. The improvement in activity was attributed to the strong capacity of LaCoO3 for oxygen exchange. The transfer of lattice oxygen from the surface of the LaCoO3 catalyst facilitates the oxidation of carbon and other surface species and leads to higher conversion and yields.","PeriodicalId":23367,"journal":{"name":"Turkish Journal of Chemistry","volume":"48 4","pages":"643-658"},"PeriodicalIF":1.3,"publicationDate":"2024-06-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://www.ncbi.nlm.nih.gov/pmc/articles/PMC11407365/pdf/","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142296504","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"化学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Effect of quince seed gum (QSG) on the performance of injectable hyaluronic acid hydrogels in terms of the rheological, morphological, and mechanical aspect. 榅桲籽胶（QSG）对可注射透明质酸水凝胶流变学、形态学和力学性能的影响。

IF 1.3 4区化学

Turkish Journal of Chemistry Pub Date : 2024-05-29 eCollection Date: 2024-01-01 DOI: 10.55730/1300-0527.3669

Serdar Kolay, Nilhan Kayaman Apohan, Erdinç Babuç, Gökay Gün

引用次数: 0

Exploring sustainable synthesis paths: a comprehensive review of environmentally friendly methods for fabricating nanomaterials through green chemistry approaches. 探索可持续合成之路：通过绿色化学方法制造纳米材料的环境友好型方法综述。

IF 1.3 4区化学

Turkish Journal of Chemistry Pub Date : 2024-05-29 eCollection Date: 2024-01-01 DOI: 10.55730/1300-0527.3691

Vishu Girotra, Pritam Kaushik, Dipti Vaya

{"title":"Exploring sustainable synthesis paths: a comprehensive review of environmentally friendly methods for fabricating nanomaterials through green chemistry approaches.","authors":"Vishu Girotra, Pritam Kaushik, Dipti Vaya","doi":"10.55730/1300-0527.3691","DOIUrl":"https://doi.org/10.55730/1300-0527.3691","url":null,"abstract":"This comprehensive review delves into the burgeoning field of nanotechnology, where the synthesis of nanoparticles (NPs) is strategically tailored to specific applications. Embracing the principles of green chemistry, nanotechnology increasingly utilizes environmentally friendly materials, such as plant extracts or microorganisms, as capping or reducing agents and solvents in the synthesis process. Notably, plant-based synthesis demonstrates enhanced stability and faster rates compared to microorganisms. The synthesized materials exhibit unique properties ranging from antimicrobial and catalytic effects to antioxidant activities and they are finding applications across diverse fields. Green synthesis processes, characterized by mild conditions in terms of temperature and reagents, stand in stark contrast to traditional chemical synthesis methods. This review focuses on the synthesis of various metal and metal oxide NPs, including Ag, Au, Zn, Fe, Mg, Ti, Sn, Cu, Cd, Ni, Co, and Ag NPs and their oxides, using plant extracts and microorganisms. We provide a comprehensive analysis of the advantages, disadvantages, and applications associated with each synthesis method. Additionally, we explore the future prospects of green synthesis and its limitations and challenges, offering insights into its evolving role in nanotechnology.","PeriodicalId":23367,"journal":{"name":"Turkish Journal of Chemistry","volume":"48 5","pages":"703-725"},"PeriodicalIF":1.3,"publicationDate":"2024-05-29","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://www.ncbi.nlm.nih.gov/pmc/articles/PMC11539912/pdf/","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142606512","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"化学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Synthesis and photooxygenation of 3-(p-substituted phenyl)-3a,8a-dihydro-4H-cyclohepta[d]isoxazoles: facial selectivity. 3-(对取代苯基)-3a,8a-二氢-4H-环庚烷并[d]异恶唑的合成与光氧合：面部选择性。

IF 1.3 4区化学

Turkish Journal of Chemistry Pub Date : 2024-05-28 eCollection Date: 2024-01-01 DOI: 10.55730/1300-0527.3688

Mahire Emel Olgun, Abdullah Menzek, Ertan Şahin, Yasin Çetinkaya

引用次数: 0

Theoretical study on the insertion reaction of the stannylenoid H₂SnLiF with X-H bonds (X = N, O, F). 锡类化合物 H2SnLiF 与 X-H 键（X = N、O、F）插入反应的理论研究。

IF 1.3 4区化学

Turkish Journal of Chemistry Pub Date : 2024-05-02 eCollection Date: 2024-01-01 DOI: 10.55730/1300-0527.3671

Shuo Wu, Bingfei Yan, Shaoli Liu, Wenzuo Li

引用次数: 0

Photocatalytic degradation of methylene blue using a Cu²⁺-modified bimetallic titanium-based metal organic framework (MIL-125) photocatalyst with enhanced visible light activity. 使用具有增强可见光活性的 Cu2+ 改性双金属钛基金属有机框架 (MIL-125) 光催化剂光催化降解亚甲基蓝。

IF 1.3 4区化学

Turkish Journal of Chemistry Pub Date : 2024-04-30 eCollection Date: 2024-01-01 DOI: 10.55730/1300-0527.3695

Gülsüm Özçelik, Ferda Civan Çavuşoğlu, Şahika Sena Bayazit, Şeyma Özkara Aydinoğlu

{"title":"Photocatalytic degradation of methylene blue using a Cu2+-modified bimetallic titanium-based metal organic framework (MIL-125) photocatalyst with enhanced visible light activity.","authors":"Gülsüm Özçelik, Ferda Civan Çavuşoğlu, Şahika Sena Bayazit, Şeyma Özkara Aydinoğlu","doi":"10.55730/1300-0527.3695","DOIUrl":"https://doi.org/10.55730/1300-0527.3695","url":null,"abstract":"Cu-modified TiO2 nanoparticles derived from MIL-125 were prepared by solvothermal method for the photocatalytic degradation of methylene blue under visible light illumination. For boosting the photocatalytic performance as well as the physicochemical properties of bare sample, 2 wt % Cu2+ ions were integrated into the nodes of the MIL-125 framework. The results showed that incorporation of 2 wt % Cu2+ ions into the MOF framework had significant effects on the crystallographic structure and morphological and optical properties of photocatalytic samples, as well as catalytic activity for the methylene blue degradation reaction. The high activity profile of Cu-modified TiO2 nanoparticles derived from MIL-125 might be attributed to the increased thermal stability, lower band gap energy, and smaller crystallite size of the sample. Activity tests were carried out at five varying MB initial concentrations and four different pH values. According to the findings, an increase in initial dye concentration resulted in a decrease in degradation efficiency. It was observed that increasing the pH value in the range of 3-11 initially led to higher degradation rates until pH 7, after which the degradation rate began to decline.","PeriodicalId":23367,"journal":{"name":"Turkish Journal of Chemistry","volume":"48 5","pages":"756-769"},"PeriodicalIF":1.3,"publicationDate":"2024-04-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://www.ncbi.nlm.nih.gov/pmc/articles/PMC11539909/pdf/","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142606526","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"化学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

DFT modeling of water-assisted hydrogen peroxide formation from a C(4a)-(hydro)peroxyflavin. C(4a)-(hydro)peroxyflavin 水辅助过氧化氢形成的 DFT 模型。

IF 1.3 4区化学

Turkish Journal of Chemistry Pub Date : 2024-04-18 eCollection Date: 2024-01-01 DOI: 10.55730/1300-0527.3673

Yılmaz Özkiliç

{"title":"DFT modeling of water-assisted hydrogen peroxide formation from a C(4a)-(hydro)peroxyflavin.","authors":"Yılmaz Özkiliç","doi":"10.55730/1300-0527.3673","DOIUrl":"https://doi.org/10.55730/1300-0527.3673","url":null,"abstract":"The cofactor of a class A monooxygenase is reduced at an external location of the enzyme and is subsequently pulled back into the active site after the reduction. This observation brings the question; is there any defense mechanism of the active site of a monooxygenase against the formation of the harmful hydrogen peroxide from the reactive C(4a)-(hydro)peroxide intermediate? In this study, the barrier energies of one to three water molecule-mediated uncoupling reaction mechanisms in water exposed reaction conditions were determined. These were found to be facile barriers. Secondly, uncoupling was modeled in the active site of kynurenine 3-monooxygenase complex which was represented with 258 atoms utilizing cluster approach. Comparison of the barrier energy of the cluster model to the models that represent the water exposed conditions revealed that the enzyme does not have an inhibitory reaction site architecture as the compared barrier energies are roughly the same. The main defense mechanism of KMO against the formation of the hydrogen peroxide is deduced to be the insulation, and without this insulation, the monooxygenation would not take place as the barrier height of the hydrogen peroxide formation within the active site is almost half of that of the monooxygenation.","PeriodicalId":23367,"journal":{"name":"Turkish Journal of Chemistry","volume":"48 3","pages":"470-483"},"PeriodicalIF":1.3,"publicationDate":"2024-04-18","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://www.ncbi.nlm.nih.gov/pmc/articles/PMC11265908/pdf/","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141761204","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"化学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Liquefaction optimization of grape pulp using response surface methodology for biopolyol production and bio-based polyurethane foam synthesis. 利用响应面方法优化葡萄浆的液化，以生产生物多酚和合成生物基聚氨酯泡沫。

IF 1.3 4区化学

Turkish Journal of Chemistry Pub Date : 2024-03-18 eCollection Date: 2024-01-01 DOI: 10.55730/1300-0527.3680

Furkan Çolakoğlu, Emre Akdoğan, Murat Erdem

{"title":"Liquefaction optimization of grape pulp using response surface methodology for biopolyol production and bio-based polyurethane foam synthesis.","authors":"Furkan Çolakoğlu, Emre Akdoğan, Murat Erdem","doi":"10.55730/1300-0527.3680","DOIUrl":"https://doi.org/10.55730/1300-0527.3680","url":null,"abstract":"Both environmental and economic disadvantages of using petroleum-based products have been forcing researchers to work on environmentally friendly, sustainable, and economical alternatives. The purpose of this study is to optimize the solvothermal liquefaction process of grape pomace using response surface methodology coupled with a central composite design. After investigating the physicochemical properties of the liquified products (biopolyol) in detail, a bio-based rigid polyurethane foam (RPUF) was synthesized and characterized. The hydroxyl and acid numbers and viscosity values of all the biopolyols were analyzed. According to variance analysis results (%95 confidence range), both the reaction temperature and catalyst loading were determined as significant parameters on the liquefaction yield (LY). The model was validated experimentally in the following reaction conditions: 4.25% catalyst loading, 50 min reaction time, and 165 °C reaction temperature, which yields an LY of 81.3%. The biopolyols produced by the validation experiment display similar characteristics (hydroxyl number: 470.5 mg KOH/g; acid number: 2.31 mg KOH/g; viscosity: 1785 cP at 25 °C) to those of commercial polyols widely preferred in the production of polyurethane foam. The physicochemical properties of bio-based foam obtained from the biopolyol were determined and the thermal conductivity, closed-cell content, apparent density, and compressive strength values of bio-based RPUF were 31.3 mW/m·K, 71.1%, 33.4 kg/m3, and 105.3 kPa, respectively.","PeriodicalId":23367,"journal":{"name":"Turkish Journal of Chemistry","volume":"48 4","pages":"568-581"},"PeriodicalIF":1.3,"publicationDate":"2024-03-18","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://www.ncbi.nlm.nih.gov/pmc/articles/PMC11407332/pdf/","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142296505","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"化学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Synthesis, characterization, and physico-chemical aspects of a new PVC-based quaternary triethanol ammonium chloride anionite for tungsten recovery. 用于钨回收的新型聚氯乙烯基季铵盐氯化铵的合成、表征和物理化学方面的问题。

IF 1.3 4区化学

Turkish Journal of Chemistry Pub Date : 2024-03-13 eCollection Date: 2024-01-01 DOI: 10.55730/1300-0527.3678

Bahig Atia

{"title":"Synthesis, characterization, and physico-chemical aspects of a new PVC-based quaternary triethanol ammonium chloride anionite for tungsten recovery.","authors":"Bahig Atia","doi":"10.55730/1300-0527.3678","DOIUrl":"https://doi.org/10.55730/1300-0527.3678","url":null,"abstract":"The usability of polyvinyl chloride-based quaternary triethanol ammonium chloride anionite (PVC-TEAC) as a potential extractant for tungstate was investigated to recover tungstate from Gabal Qash Amir, Egypt, assaying 70.91% WO3. Structure elucidation for PVC-TEAC anionite was successfully carried out using several techniques. Experimental measurements, such as pH, agitation time, initial tungsten concentration, anionite dose, co-ions, temperature, and eluting agents, have been optimized. It was found that PVC-TEAC anionite has a maximum capacity of 63 mg per gram. From the distribution isotherm modeling, Langmuir's model fits the experimental results better than Freundlich's, with a theoretical value of 61.728 mg g-1. According to kinetic modeling, the first- and second-order modeling may be regarded as a mixed modeling for a successful adsorption system. Thermodynamic prospects reveal that the adsorption process was predicted as an exothermic, spontaneous, and preferable adsorption at low temperatures. Tungsten ions can be eluted from the loaded anionite, by 1M H2SO4 with a 97% efficiency rate. It was found that PVC-TEAC anionite reveals good separation factor (S.F.) towards most of co-ions. A successful Alkali fusion with NaOH flux followed by tungstate recovery by PVC-TEAC anionite is used to obtain a high-purity tungsten oxide concentrate (WO3), with a tungsten content of 78.3% and a purity of 98.75%.","PeriodicalId":23367,"journal":{"name":"Turkish Journal of Chemistry","volume":"48 4","pages":"524-549"},"PeriodicalIF":1.3,"publicationDate":"2024-03-13","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://www.ncbi.nlm.nih.gov/pmc/articles/PMC11407338/pdf/","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142296520","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"化学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0