Pure and Applied Chemistry最新文献_第9页

Advances in understanding comproportionation and disproportionation in nickel catalysis 在理解镍催化中的配比和歧化方面取得的进展

IF 1.8 4区化学

Pure and Applied Chemistry Pub Date : 2024-03-21 DOI: 10.1515/pac-2024-0106

Craig S. Day

引用次数: 0

Surface tension measurement of FAP-based ionic liquid pendant drops in a high vacuum/gas cell 在高真空/气室中测量基于 FAP 的离子液体悬滴的表面张力

IF 1.8 4区化学

Pure and Applied Chemistry Pub Date : 2024-03-20 DOI: 10.1515/pac-2023-1113

Julius Kim Tiongson, Imee Su Martinez

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Bio-based aerogel composites of coconut pith-derived carbon and chitosan for efficient anionic dye-polluted water treatment 椰壳碳和壳聚糖生物基气凝胶复合材料用于高效处理阴离子染料污染的水体

IF 1.8 4区化学

Pure and Applied Chemistry Pub Date : 2024-03-20 DOI: 10.1515/pac-2024-0102

Oanh H. Nguyen, Huy T. A. Nguyen, Luon Tan Nguyen, Nga H. N. Do, Lam Dai Tran, Viet T. Tran, Phung K. Le, Kien A. Le

{"title":"Bio-based aerogel composites of coconut pith-derived carbon and chitosan for efficient anionic dye-polluted water treatment","authors":"Oanh H. Nguyen, Huy T. A. Nguyen, Luon Tan Nguyen, Nga H. N. Do, Lam Dai Tran, Viet T. Tran, Phung K. Le, Kien A. Le","doi":"10.1515/pac-2024-0102","DOIUrl":"https://doi.org/10.1515/pac-2024-0102","url":null,"abstract":"Biomass-based aerogels are of interest due to their abundant precursors, ease of functionalization, eco-friendliness, low cost, and effectiveness in dye-contaminated water treatment. Coconut pith (CP) known as a by-product after coconut processing is a sponge-like and lightweight material discarded in large volumes. For the first time, carbon micro-particles resulting from two-step treatment and pyrolysis of CP have been successfully incorporated with chitosan to produce aerogel composites by high-speed homogenization and freeze-drying. After pretreatment, holocellulose content and crystallinity index of the recovered CP pulp are respectively 75.4 and 58.6 % along with a solid recovery rate of 27.5 %. Characteristic properties of the aerogel composites are featured by their density as low as 15.23–28.17 mg/cm3, remarkably high porosity of 98.17–99.05 %, and Young’s modulus of 1.64–12.23 kPa. Synergistic effects of the porous network, electrostatic interactions between both amine groups in chitosan and carbon surface with methyl orange (MO) cause the as-fabricated aerogel composites to achieve an extremely high adsorption capacity of 454.13 mg/g and removal efficiency of 92.32 % at initial MO concentration of 500 mg/L. Therefore, the CP-derived carbon/chitosan aerogel composites synthesized from a feasible procedure exhibit their great potential in enhancing the value of coconut waste and dealing with dye-contaminated water pollution by simple and economical adsorption.","PeriodicalId":20911,"journal":{"name":"Pure and Applied Chemistry","volume":null,"pages":null},"PeriodicalIF":1.8,"publicationDate":"2024-03-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140198220","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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Biochar-based catalysts: a potential disposal of plant biomass from phytoremediation 生物炭催化剂：植物修复中植物生物质的一种潜在处理方式

IF 1.8 4区化学

Pure and Applied Chemistry Pub Date : 2024-03-18 DOI: 10.1515/pac-2024-0105

Nhuan N. Doan, Ha T. Nguyen, Luan T. Nguyen, Lam D. Tran, Tuan D. Phan, Tien A. Nguyen, Linh T. T. Nguyen

引用次数: 0

Selection of graphene as a conductive additive for biomass-based activated carbon electrode in capacitive deionization: acid-treated as a practical approach to reduce graphene content 选择石墨烯作为电容式去离子法中生物质活性炭电极的导电添加剂：酸处理是降低石墨烯含量的实用方法

IF 1.8 4区化学

Pure and Applied Chemistry Pub Date : 2024-03-18 DOI: 10.1515/pac-2024-0109

Thi Nam Pham, Thi Thom Nguyen, Le Thanh Nguyen Huynh, Viet Hai Le, Thi Kim Ngan Nguyen, Tuan Anh Nguyen, Raa Khimi Shuib, Dai Lam Tran, Tuan Anh Nguyen

{"title":"Selection of graphene as a conductive additive for biomass-based activated carbon electrode in capacitive deionization: acid-treated as a practical approach to reduce graphene content","authors":"Thi Nam Pham, Thi Thom Nguyen, Le Thanh Nguyen Huynh, Viet Hai Le, Thi Kim Ngan Nguyen, Tuan Anh Nguyen, Raa Khimi Shuib, Dai Lam Tran, Tuan Anh Nguyen","doi":"10.1515/pac-2024-0109","DOIUrl":"https://doi.org/10.1515/pac-2024-0109","url":null,"abstract":"The use of graphene (GE) as a conductive additive for activated carbon (AC) electrode in capacitive deionization (CDI) has attracted much attention due to its high electrical conductivity. However, self-agglomeration by π–π interactions between individual GE sheets required the use of high content to ensure an efficient conductive network in the electrode, which limited its practical application. This work proposed an approach to reduce the GE content in the fabrication of biomass-based activated carbon electrode for CDI application. The stacking effect of GE sheets is inhibited when GE sheets functionalize with oxygen groups via acid treatment under ultrasonic condition. This helps to reduce GE content to less than 2 wt% in the fabrication of CDI electrodes. The electrode fabricated using 2 wt% treated GE (T-GE) achieved the superior capacitance of 54 F/g, twice that of the pristine AC. The desalination process using as-prepared electrodes was evaluated by batch-mode CDI system with the initial NaCl solution of 2000 ppm and 3000 ppm at various applied voltages. The AC/T-GE 2 % electrode showed excellent performance with a desalination capacity greater than 10 mg/g, and reached an adsorption rate of 1.93 mg/g.min in both solutions under an applied voltage 1.2 V.","PeriodicalId":20911,"journal":{"name":"Pure and Applied Chemistry","volume":null,"pages":null},"PeriodicalIF":1.8,"publicationDate":"2024-03-18","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140167173","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}

引用次数: 0

The effect of chemical modification using citraconic anhydride on the stability of α-amylase from Aspergillus fumigatus 使用柠檬酸酐进行化学修饰对曲霉α-淀粉酶稳定性的影响

IF 1.8 4区化学

Pure and Applied Chemistry Pub Date : 2024-03-15 DOI: 10.1515/pac-2023-1138

Yandri Yandri, Lupia Widya Astuti, Hendri Ropingi, Tati Suhartati, Bambang Irawan, Sutopo Hadi

{"title":"The effect of chemical modification using citraconic anhydride on the stability of α-amylase from Aspergillus fumigatus","authors":"Yandri Yandri, Lupia Widya Astuti, Hendri Ropingi, Tati Suhartati, Bambang Irawan, Sutopo Hadi","doi":"10.1515/pac-2023-1138","DOIUrl":"https://doi.org/10.1515/pac-2023-1138","url":null,"abstract":"The purpose of this research is to improve the stability of α-amylase from Aspergillus fumigatus by chemical modification with citraconic anhydride. The α-amylase was isolated using a centrifugation technique, followed by purification using precipitation and dialysis of ammonium sulfate salt. The experimental results demonstrate that the stability of purified α-amylase is 13.41 times higher than that of the crude extract. A significant increase in the optimum temperature was also achieved, in which the optimum temperature of 50 °C was found for native α-amylase, while for modified α-amylase, the optimum temperature of 60 °C was found. Similarly, an increase in half-life was also evident, which is 38.72 min found for the native enzyme to 256.67–330.00 min for modified α-amylase, depending on the volume of citraconic anhydride used. Modification also resulted in increased free energy values (ΔG i) from 104.348 for the native enzyme to 109.585–110.281 kJ mol−1 for modified α-amylase, indicating that modified α-amylase is stiffer than native α-amylase. The results obtained in this work demonstrate that citric anhydride is a very promising modifying agent to improve the stability and performance of α-amylase enzyme isolated from A. fumigatus. The findings of this study also offer an opportunity for the application of citric anhydride for other enzymes.","PeriodicalId":20911,"journal":{"name":"Pure and Applied Chemistry","volume":null,"pages":null},"PeriodicalIF":1.8,"publicationDate":"2024-03-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140156068","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}

引用次数: 0

Impact of fluvial discharge on 137Cs in the ocean following the Fukushima Daiichi Nuclear Power Station accident 福岛第一核电站事故后河道排放对海洋中 137Cs 的影响

IF 1.8 4区化学

Pure and Applied Chemistry Pub Date : 2024-03-12 DOI: 10.1515/pac-2023-0902

Daisuke Tsumune, Takaki Tsubono, Kazuhiro Misumi, Kazuyuki Sakuma, Yuichi Onda

{"title":"Impact of fluvial discharge on 137Cs in the ocean following the Fukushima Daiichi Nuclear Power Station accident","authors":"Daisuke Tsumune, Takaki Tsubono, Kazuhiro Misumi, Kazuyuki Sakuma, Yuichi Onda","doi":"10.1515/pac-2023-0902","DOIUrl":"https://doi.org/10.1515/pac-2023-0902","url":null,"abstract":"After the Fukushima Daiichi Nuclear Power Station (F1NPS) accident, 137Cs activity concentrations have not yet decreased to pre-accident levels because of direct release from the site and fluvial discharges of 137Cs deposited on land. It is necessary to consider dispersion processes in the coastal area to understand the impact of multiple river discharges and direct release. To achieve this goal, we carried out oceanic dispersion simulations that considered direct release and fluvial discharges and compared the results with the annual averages of observed data. We assumed that particulate 137Cs discharged from rivers to the ocean quickly resuspended and re-leached after coagulation and precipitation, and that all of the 137Cs was dispersed. The reproducibility of results was improved by considering fluvial discharges of particulate 137Cs at all sites between 2013 and 2016, except near the F1NPS. In other words, particulate 137Cs discharged from rivers was found to influence the results of ocean surface activity concentrations within a relatively short period of time. The impact of direct release was dominant for the observed 137Cs activity concentrations adjacent to the F1NPS, which was used to estimate direct releases.","PeriodicalId":20911,"journal":{"name":"Pure and Applied Chemistry","volume":null,"pages":null},"PeriodicalIF":1.8,"publicationDate":"2024-03-12","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140116520","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}

引用次数: 0

Decarbonizing our environment via the promotion of biomass methanation in developing nations: a waste management tool 通过在发展中国家推广生物质甲烷化使我们的环境脱碳：一种废物管理工具

IF 1.8 4区化学

Pure and Applied Chemistry Pub Date : 2024-03-11 DOI: 10.1515/pac-2023-1109

Chidiebere Millicent Igwebuike, Toyese Oyegoke

{"title":"Decarbonizing our environment via the promotion of biomass methanation in developing nations: a waste management tool","authors":"Chidiebere Millicent Igwebuike, Toyese Oyegoke","doi":"10.1515/pac-2023-1109","DOIUrl":"https://doi.org/10.1515/pac-2023-1109","url":null,"abstract":"For a long time, fossil fuel has been a part of our everyday lives and has constantly led to the emission of carbon dioxide (CO2) into the environment. The release of methane (CH4) into our surroundings can be caused by the decomposition of organic wastes produced by our daily activities; CH4 produced by human activity is responsible for at least 25 % of global warming. CH4 is a known potent greenhouse gas that can trap about 35 times more heat than CO2. These greenhouse gases play a role in climate change and global warming. It, therefore, becomes important to explore measures for decarbonizing our environment. Biomethane production using our generated waste is a promising decarbonization approach with significant potential for mitigating greenhouse gas emissions. This paper overviews potential biomass methanation feedstocks and investigates several technologies, such as anaerobic digestion, combined pyrolysis and methanation, and combined gasification and methanation. SWOT analysis of waste conversion to biomethane was conducted, and important points related to the scaling-up of biomethane production processes were outlined. Also, insights into prospects for promoting biomass methanation deployment were provided. In conclusion, biomass methanation has great potential for producing sustainable energy. Hence, collaboration between industrialists, researchers, government agencies, and stakeholders including an understanding of the financial investments, return on investments, or potential subsidies and incentives could enhance the practicality of the proposed solution. Research and development should be continuously carried out as they are necessary to scale up and promote the technology. Also, there should be technical training for stakeholders as it is essential for the smooth development of the sector.","PeriodicalId":20911,"journal":{"name":"Pure and Applied Chemistry","volume":null,"pages":null},"PeriodicalIF":1.8,"publicationDate":"2024-03-11","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140105728","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}

引用次数: 0

In-situ and operando Grazing Incidence XAS: a novel set-up and its application to model Pd electrodes for alcohols oxidation 原位和操作性掠入射 XAS：一种新型装置及其在醇氧化模型钯电极中的应用

IF 1.8 4区化学

Pure and Applied Chemistry Pub Date : 2024-03-08 DOI: 10.1515/pac-2023-1013

Enrico Berretti, Andrea Giaccherini, Vincenzo Dell’Aquila, Francesco Di Benedetto, Giordano Montegrossi, Giovanni Orazio Lepore, Massimo Innocenti, Francesco D’Acapito, Francesco Vizza, Alessandro Lavacchi

{"title":"In-situ and operando Grazing Incidence XAS: a novel set-up and its application to model Pd electrodes for alcohols oxidation","authors":"Enrico Berretti, Andrea Giaccherini, Vincenzo Dell’Aquila, Francesco Di Benedetto, Giordano Montegrossi, Giovanni Orazio Lepore, Massimo Innocenti, Francesco D’Acapito, Francesco Vizza, Alessandro Lavacchi","doi":"10.1515/pac-2023-1013","DOIUrl":"https://doi.org/10.1515/pac-2023-1013","url":null,"abstract":"In this article, we present an in-situ and operando time-resolved X-ray Absorption Spectroscopy (XAS) technique which exploits a combination of Grazing Incidence XAS (GIXAS) and Fixed Energy X-ray Absorption Voltammetry (FEXRAV), the Grazing Incidence FEXRAV (GI-FEXRAV). A case-study is also outlined. Palladium ultra-low loadings were deposited above Au polycrystalline iso-oriented substrates adopting three different deposition methods: surface-controlled electrochemical methods, direct electrodeposition, and physical vapour deposition (PVD). These catalytical surfaces were prepared for the investigation by GI-FEXRAV of the Pd oxidation/dissolution phenomenon that could occur when the metal is used in the anodic compartment of Direct Alcohol Fuel Cells (DAFCs) or in electrochemical reformers. Moreover, we report a robust, low cost and versatile procedure to obtain wide and flat iso-oriented gold substrates that can mimic monocrystalline gold (1 1 1) in the electrochemical response. The use of GI-FEXRAV for the operando characterization of the catalysts, in conjunction with the designed experimental cell and our flexible Au-based electrochemical substrates show an invaluable potential in the operando study of fundamental phenomena in heterogeneous electrocatalysis model systems and, due to its versatility, paves the way to further studies on a wide selection of electrochemical systems.","PeriodicalId":20911,"journal":{"name":"Pure and Applied Chemistry","volume":null,"pages":null},"PeriodicalIF":1.8,"publicationDate":"2024-03-08","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140074394","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}

引用次数: 0

Maximising the consistency of the presentation of the molecular level with its quantum mechanical description: challenges and opportunities 最大限度地保持分子水平的表述与其量子力学描述的一致性：挑战与机遇

IF 1.8 4区化学

Pure and Applied Chemistry Pub Date : 2024-03-08 DOI: 10.1515/pac-2023-1121

Liliana Mammino

{"title":"Maximising the consistency of the presentation of the molecular level with its quantum mechanical description: challenges and opportunities","authors":"Liliana Mammino","doi":"10.1515/pac-2023-1121","DOIUrl":"https://doi.org/10.1515/pac-2023-1121","url":null,"abstract":"Reasoning in terms of molecules has since long become fully embedded in any chemistry discourse. On the other hand, students’ familiarization with the molecular level in pre-university instruction is not always satisfactory, and their ability to view chemical phenomena in terms of what molecules do may not reach the extent and quality that would be needed to ensure effective conceptual understanding. Students may remain uncertain about the interpretation of the molecular features of a number of phenomena even through undergraduate instruction. Removing uncertainties and promoting comfortable familiarization is increasingly becoming an imperative for chemistry education, in view of the novel central role that the molecular level is acquiring not only for the customary interpretation of phenomena, but for the high variety of applications that have been blooming in recent years. Consequently, learners’ familiarization with the world of molecules needs to become more informative and complete. It is equally important that the information that they acquire about molecules be consistent with the modern descriptions, which are based on quantum mechanics. This requires accurate search for optimal balances between the need to simplify the terms of the descriptions in order to make them accessible to leaners according to the different levels of chemistry learning, and the simultaneous need to maintain adequate conceptual rigour. The present work outlines approaches which have proved viable and effective, and which rely on accurate use of language and visualization as the major explanation resources.","PeriodicalId":20911,"journal":{"name":"Pure and Applied Chemistry","volume":null,"pages":null},"PeriodicalIF":1.8,"publicationDate":"2024-03-08","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140074191","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}

引用次数: 0