In this study, CSs-g-C3N4 carbon and nitrogen composites based on glucose carbon spheres were successfully synthesized. High-temperature and high-pressure hydrothermal reaction successfully induces the amidation of glucose with melamine, which led to the synthesis of CSs-g-C3N4 carbon and nitrogen composites. A series of characterization tests and electrochemical tests revealed the lithium storage mechanism of CSs-g-C3N4 composites. The experimental results show that the CSs-g-C3N4 composites exhibit excellent cycling performance in lithium-ion battery anode applications. Specifically, after 300 cycles at a current density of 1 A/g, the material still maintains a lithium storage capacity of 395.2 mAh/g. This data fully demonstrates the superiority and stability of CSs-g-C3N4 composites as anode materials for lithium-ion batteries. In addition, the successful preparation of CSs-g-C3N4 composites not only demonstrates the technical feasibility of using g-C3N4 to prepare carbon and nitrogen composites, but also provides a new idea and direction for the research and development of anode materials for lithium-ion batteries. This achievement is expected to promote the wider application of g-C3N4 in the field of energy storage and further enhance the performance of lithium-ion batteries.
{"title":"Carbon cladding boosts graphite-phase carbon nitride for lithium-ion battery negative electrode materials","authors":"Houli Ye","doi":"10.1039/d4nj02230k","DOIUrl":"https://doi.org/10.1039/d4nj02230k","url":null,"abstract":"In this study, CSs-g-C3N4 carbon and nitrogen composites based on glucose carbon spheres were successfully synthesized. High-temperature and high-pressure hydrothermal reaction successfully induces the amidation of glucose with melamine, which led to the synthesis of CSs-g-C3N4 carbon and nitrogen composites. A series of characterization tests and electrochemical tests revealed the lithium storage mechanism of CSs-g-C3N4 composites. The experimental results show that the CSs-g-C3N4 composites exhibit excellent cycling performance in lithium-ion battery anode applications. Specifically, after 300 cycles at a current density of 1 A/g, the material still maintains a lithium storage capacity of 395.2 mAh/g. This data fully demonstrates the superiority and stability of CSs-g-C3N4 composites as anode materials for lithium-ion batteries. In addition, the successful preparation of CSs-g-C3N4 composites not only demonstrates the technical feasibility of using g-C3N4 to prepare carbon and nitrogen composites, but also provides a new idea and direction for the research and development of anode materials for lithium-ion batteries. This achievement is expected to promote the wider application of g-C3N4 in the field of energy storage and further enhance the performance of lithium-ion batteries.","PeriodicalId":95,"journal":{"name":"New Journal of Chemistry","volume":null,"pages":null},"PeriodicalIF":3.3,"publicationDate":"2024-07-02","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141523920","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"化学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Atian Xie, Lei Lu, Can Wei, Jirong Luo, Tong Tian, Feiyan Wang, Quan Li, Jiaheng Pu, Jiuyun Cui, Chengcai Li
Surface modification of membranes through facile coating methods is a promising way to improve their pollution resistance and separation performance. Here, a tea polyphenols (TP) coated PVDF membrane (PVDF-TP) was prepared via simple temperature-regulated oxidative polymerization. The obtained membrane exhibited water contact angle of 0° and underwater oil contact angle of 168.2°. This superhydrophilic/underwater superoleophobic membrane showed good separation capabilities with fluxes of 88.3-169.9 L m-2 h-1 and separation efficiencies of over 98.7% various oil-in-water emulsions under gravity-driven. The PVDF-TP membrane exhibited excellent stability and is capable of withstanding ultrasonic waves, bending, and agitation. Even recycled for more than 15 times, the separation efficiency of membrane is still above 98.7% and the flux decreased by approximately 37%, demonstrated the well anti-fouling performance. Considering the characteristics of simple preparation, good antifouling performance, high separation efficiency, and good stability, PVDF-TP membrane has a broad application prospect in the field of oil-water separation.
{"title":"Simple temperature-regulated polymerization for fabrication of tea polyphenols modified PVDF membrane toward emulsion separation","authors":"Atian Xie, Lei Lu, Can Wei, Jirong Luo, Tong Tian, Feiyan Wang, Quan Li, Jiaheng Pu, Jiuyun Cui, Chengcai Li","doi":"10.1039/d4nj02439g","DOIUrl":"https://doi.org/10.1039/d4nj02439g","url":null,"abstract":"Surface modification of membranes through facile coating methods is a promising way to improve their pollution resistance and separation performance. Here, a tea polyphenols (TP) coated PVDF membrane (PVDF-TP) was prepared via simple temperature-regulated oxidative polymerization. The obtained membrane exhibited water contact angle of 0° and underwater oil contact angle of 168.2°. This superhydrophilic/underwater superoleophobic membrane showed good separation capabilities with fluxes of 88.3-169.9 L m-2 h-1 and separation efficiencies of over 98.7% various oil-in-water emulsions under gravity-driven. The PVDF-TP membrane exhibited excellent stability and is capable of withstanding ultrasonic waves, bending, and agitation. Even recycled for more than 15 times, the separation efficiency of membrane is still above 98.7% and the flux decreased by approximately 37%, demonstrated the well anti-fouling performance. Considering the characteristics of simple preparation, good antifouling performance, high separation efficiency, and good stability, PVDF-TP membrane has a broad application prospect in the field of oil-water separation.","PeriodicalId":95,"journal":{"name":"New Journal of Chemistry","volume":null,"pages":null},"PeriodicalIF":3.3,"publicationDate":"2024-07-02","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141523926","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"化学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Yang Liu, Linfeng Sheng, Muhammad Abdullah, Xing Shen, Ying He, Juan Liu, Xin Chen
In situ liquid cell electron microscopy technology has high temporal and spatial resolution, enabling real-time observation of physical and chemical processes in liquid environments. However, the common in situ liquid cell scanning electron microscopy (LC-SEM) technology has faced limitations due to the relatively large thickness of the SiNx window, resulting in unsatisfactory resolution, limiting the broad adoption of the LC-SEM technology. This article represents one novel approach of utilizing ultra-thin SiNx windows for LC-SEM observation of the distribution and dynamic changes of gold (Au) nanoparticles/zinc oxide quantum dots (ZnO QDs)/reduced graphene oxide (rGO) ternary composites in liquid. The results demonstrate a single/near-single dispersed distribution of ZnO QDs on the surface of the rGO, with Au nanoparticles and ZnO clusters mainly concentrated on the rGO folds. The composite structure demonstrates relative stability, attributed to electrostatic forces. Using Au nanoparticles and ZnO QDs as hierarchical reference markers, a high LC-SEM image resolution of ~4 nm is obtained, which allows the observation and motion analysis of the Au nanoparticles, rGO nanosheets, as well as ZnO QDs in the liquid cell. Such LC-SEM technology shows good repeatability on the noble-metal/ZnO-QDs/rGO ternary composite samples, with good potential for the future QD composite material researches.
{"title":"High Resolution Observation of the Noble-Metal/ZnO-QDs/rGO Ternary System Using Ultra-Thin SiNx Window in situ Liquid Cell Scanning Electron Microscopy","authors":"Yang Liu, Linfeng Sheng, Muhammad Abdullah, Xing Shen, Ying He, Juan Liu, Xin Chen","doi":"10.1039/d4nj02195a","DOIUrl":"https://doi.org/10.1039/d4nj02195a","url":null,"abstract":"In situ liquid cell electron microscopy technology has high temporal and spatial resolution, enabling real-time observation of physical and chemical processes in liquid environments. However, the common in situ liquid cell scanning electron microscopy (LC-SEM) technology has faced limitations due to the relatively large thickness of the SiNx window, resulting in unsatisfactory resolution, limiting the broad adoption of the LC-SEM technology. This article represents one novel approach of utilizing ultra-thin SiNx windows for LC-SEM observation of the distribution and dynamic changes of gold (Au) nanoparticles/zinc oxide quantum dots (ZnO QDs)/reduced graphene oxide (rGO) ternary composites in liquid. The results demonstrate a single/near-single dispersed distribution of ZnO QDs on the surface of the rGO, with Au nanoparticles and ZnO clusters mainly concentrated on the rGO folds. The composite structure demonstrates relative stability, attributed to electrostatic forces. Using Au nanoparticles and ZnO QDs as hierarchical reference markers, a high LC-SEM image resolution of ~4 nm is obtained, which allows the observation and motion analysis of the Au nanoparticles, rGO nanosheets, as well as ZnO QDs in the liquid cell. Such LC-SEM technology shows good repeatability on the noble-metal/ZnO-QDs/rGO ternary composite samples, with good potential for the future QD composite material researches.","PeriodicalId":95,"journal":{"name":"New Journal of Chemistry","volume":null,"pages":null},"PeriodicalIF":3.3,"publicationDate":"2024-07-02","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141531813","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"化学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Antibiotic resistance induced by antibiotics abuse is considered as one of the serious public health problems. Antibacterial photodynamic therapy (APDT) caused by efficient photosensitizer is gaining increasing attention in recent years owing to its high efficacy and non-drug resistance. Herein, we reported a photosensitizer system composed by tetraminophenyl porphyrin (TAPP) loading in guanidinium-based ionic covalent framework (COFTGTp) as TAPP/COFTGTp by π-π interactions to be used for APDT, which will not only solve the TAPP as photosensitizer easy to aggregate in aqueous solution and ineffective against gram-negative bacteria, but can combine antibacterial activity of the cationic COFTGTp with APDT induced by TAPP to achieve optimal antibacterial effect on both gram-positive and gram-negative bacteria. After TAPP loading in COFTGTp, the stability of TAPP/COFTGTp in aqueous solution was enhanced compared with TAPP, and the drug load efficiency can reach to 27%. Under white light irradiation, TAPP/COFTGTp can be activated to catalyzed oxygen into reactive oxygen species (ROS) including singlet oxygen (1O2), which will annihilate bacteria by the full use of the positive electricity of cationic COFTGTp that closed the distance between bacteria and ROS. In addition, MTT and hemolysis experiments showed TAPP/COFTGTp was almost noncytotoxic and did not cause hemolysis. Most remarkably, the minimum inhibitory concentration (MIC) of TAPP/COFTGTp for E. coli and S. aureus were 100 μg/mL and 50 μg/mL, respectively. As a result, TAPP/COFTGTp was an expected antibacterial material and promising to substitute traditional antibiotics for solving antibiotic resistance and the emergence of superbacteria.
{"title":"The photosensitizer system based on cationic COF carrier with the loading tetraminoporphyrin and its combined antibacterial effect","authors":"Ling Li, Jing Ma, Chong Liu, Hao Li, Dayang Xie, Tinghong Wang, Yuan Cui, Yanwei Li, Yanhui Li","doi":"10.1039/d4nj01766h","DOIUrl":"https://doi.org/10.1039/d4nj01766h","url":null,"abstract":"Antibiotic resistance induced by antibiotics abuse is considered as one of the serious public health problems. Antibacterial photodynamic therapy (APDT) caused by efficient photosensitizer is gaining increasing attention in recent years owing to its high efficacy and non-drug resistance. Herein, we reported a photosensitizer system composed by tetraminophenyl porphyrin (TAPP) loading in guanidinium-based ionic covalent framework (COF<small><sub>TGTp</sub></small>) as TAPP/COF<small><sub>TGTp</sub></small> by π-π interactions to be used for APDT, which will not only solve the TAPP as photosensitizer easy to aggregate in aqueous solution and ineffective against gram-negative bacteria, but can combine antibacterial activity of the cationic COF<small><sub>TGTp</sub></small> with APDT induced by TAPP to achieve optimal antibacterial effect on both gram-positive and gram-negative bacteria. After TAPP loading in COF<small><sub>TGTp</sub></small>, the stability of TAPP/COF<small><sub>TGTp</sub></small> in aqueous solution was enhanced compared with TAPP, and the drug load efficiency can reach to 27%. Under white light irradiation, TAPP/COF<small><sub>TGTp</sub></small> can be activated to catalyzed oxygen into reactive oxygen species (ROS) including singlet oxygen (<small><sup>1</sup></small>O<small><sub>2</sub></small>), which will annihilate bacteria by the full use of the positive electricity of cationic COF<small><sub>TGTp</sub></small> that closed the distance between bacteria and ROS. In addition, MTT and hemolysis experiments showed TAPP/COF<small><sub>TGTp</sub></small> was almost noncytotoxic and did not cause hemolysis. Most remarkably, the minimum inhibitory concentration (MIC) of TAPP/COF<small><sub>TGTp</sub></small> for <em>E. coli</em> and <em>S. aureus</em> were 100 μg/mL and 50 μg/mL, respectively. As a result, TAPP/COF<small><sub>TGTp</sub></small> was an expected antibacterial material and promising to substitute traditional antibiotics for solving antibiotic resistance and the emergence of superbacteria.","PeriodicalId":95,"journal":{"name":"New Journal of Chemistry","volume":null,"pages":null},"PeriodicalIF":3.3,"publicationDate":"2024-07-02","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141523921","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"化学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Betsy Elizabeth Isaac Newton, Elanthamilan Elaiyappillai, Sea-Fue Wang, Sharmila Lydia I
This study presents the synthesis of a new nanocomposite named Zn3V2O8/Hydroxyapatite (ZnV/HAP) to assess its photocatalytic efficiency for degrading Congo Red dye (CR) under visible light. The nanocomposite was analyzed using various techniques, including FT-IR, XRD, UV-vis DRS, SEM, TEM, EDAX, XPS, and BET analysis. The photocatalyst's performance was enhanced by a shift in its band gap to 1.7 eV, compared to similar materials. ZnV/HAP exhibits superior photocatalytic performance compared to ZnV particles. The rate constant for the degradation of CR by ZnV/HAP was determined to be 0.0063 min-1. The degrading efficiency of the ZnV/HAP composite is 94 %. The enhanced charge separation in ZnV/HAP composite is attributed to the strong contacts between the interfacial surfaces, which are responsible for their higher activity. A method was found to facilitate this heightened activity, with hydroxyl and superoxide radicals serving as crucial reactive species that significantly contribute to the photocatalytic process. The phytotoxicity investigation conducted on Vigna radiata plants demonstrated the photocatalytic effectiveness of the ZnV/HAP combination. In addition, the deteriorated CR dye solution exhibited a color removal efficiency of 94.62 % for total organic carbon (TOC) and 92.86 % for chemical oxygen demand (COD). The findings demonstrate that synthesized ZnV/HAP is a viable substitute for visible-light-driven photocatalysts. Furthermore, the antimicrobial efficacy of ZnV/HAP was assessed against Staphylococcus aureus, Pseudomonas aeruginosa, Candida albicans, and Aspergillus niger, demonstrating remarkable antibacterial and antifungal properties comparable to the positive control medication.
{"title":"Interface Engineering of Zn3V2O8 decorated Hydroxyapatite Nanocomposite for Photocatalytic Degradation of Congo Red dye and Anti-Microbial Applications","authors":"Betsy Elizabeth Isaac Newton, Elanthamilan Elaiyappillai, Sea-Fue Wang, Sharmila Lydia I","doi":"10.1039/d4nj01983k","DOIUrl":"https://doi.org/10.1039/d4nj01983k","url":null,"abstract":"This study presents the synthesis of a new nanocomposite named Zn3V2O8/Hydroxyapatite (ZnV/HAP) to assess its photocatalytic efficiency for degrading Congo Red dye (CR) under visible light. The nanocomposite was analyzed using various techniques, including FT-IR, XRD, UV-vis DRS, SEM, TEM, EDAX, XPS, and BET analysis. The photocatalyst's performance was enhanced by a shift in its band gap to 1.7 eV, compared to similar materials. ZnV/HAP exhibits superior photocatalytic performance compared to ZnV particles. The rate constant for the degradation of CR by ZnV/HAP was determined to be 0.0063 min-1. The degrading efficiency of the ZnV/HAP composite is 94 %. The enhanced charge separation in ZnV/HAP composite is attributed to the strong contacts between the interfacial surfaces, which are responsible for their higher activity. A method was found to facilitate this heightened activity, with hydroxyl and superoxide radicals serving as crucial reactive species that significantly contribute to the photocatalytic process. The phytotoxicity investigation conducted on Vigna radiata plants demonstrated the photocatalytic effectiveness of the ZnV/HAP combination. In addition, the deteriorated CR dye solution exhibited a color removal efficiency of 94.62 % for total organic carbon (TOC) and 92.86 % for chemical oxygen demand (COD). The findings demonstrate that synthesized ZnV/HAP is a viable substitute for visible-light-driven photocatalysts. Furthermore, the antimicrobial efficacy of ZnV/HAP was assessed against Staphylococcus aureus, Pseudomonas aeruginosa, Candida albicans, and Aspergillus niger, demonstrating remarkable antibacterial and antifungal properties comparable to the positive control medication.","PeriodicalId":95,"journal":{"name":"New Journal of Chemistry","volume":null,"pages":null},"PeriodicalIF":3.3,"publicationDate":"2024-07-02","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141523925","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"化学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
A novel visible-light-mediated fluoroalkylation/cyclization tandem process for constructing fluoroalkyl-containing 3,4-disubstituted dihydro-1,5-naphthyridin-2(1H)-ones and 7,8-disubstituted dihydropyrido[3,2-d]pyrimidin-6(5H)-ones has been explored. This method is compatible with a wide range of N-arylcinnamamides as well as sodium fluoroalkylsulfonates (RfSO2Na, Rf = CHF2, CF3, C4F9, C6F13) and avoids the need for any external oxidant or photocatalyst. Mechanism studies revealed that the singlet oxygen coexists with the superoxide radical anion through energy transfer and single electron transfer processes during the photoredox reaction.
{"title":"Visible-light-induced self-catalyzed fluoroalkylation/cyclization of N-arylcinnamamides: synthesis of fluoroalkyl-containing 3,4-disubstituted dihydro-1,5-naphthyridin-2(1H)-ones and 7,8-disubstituted dihydropyrido[3,2-d]pyrimidin-6(5H)-ones","authors":"Hongmiao Yao, Qianding Zeng, Yiqun Tang, Xiangqiao Yang, Shaodong Wang, Jiangmeng Ren, Bu-Bing Zeng","doi":"10.1039/d4nj01975j","DOIUrl":"https://doi.org/10.1039/d4nj01975j","url":null,"abstract":"A novel visible-light-mediated fluoroalkylation/cyclization tandem process for constructing fluoroalkyl-containing 3,4-disubstituted dihydro-1,5-naphthyridin-2(1<em>H</em>)-ones and 7,8-disubstituted dihydropyrido[3,2-<em>d</em>]pyrimidin-6(5<em>H</em>)-ones has been explored. This method is compatible with a wide range of <em>N</em>-arylcinnamamides as well as sodium fluoroalkylsulfonates (RfSO<small><sub>2</sub></small>Na, Rf = CHF<small><sub>2</sub></small>, CF<small><sub>3</sub></small>, C<small><sub>4</sub></small>F<small><sub>9</sub></small>, C<small><sub>6</sub></small>F<small><sub>13</sub></small>) and avoids the need for any external oxidant or photocatalyst. Mechanism studies revealed that the singlet oxygen coexists with the superoxide radical anion through energy transfer and single electron transfer processes during the photoredox reaction.","PeriodicalId":95,"journal":{"name":"New Journal of Chemistry","volume":null,"pages":null},"PeriodicalIF":3.3,"publicationDate":"2024-07-02","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141523924","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"化学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Juliana Guerra Pinto, Francesca Laneri, Isabelle de Paula Ribeiro Brambilla, Maria Clara Barbosa Silva de Azevedo, Jéssica A. R. Ambrósio, Andreza S Ribeiro, Aurore Fraix, Salvatore Sortino, Juliana Ferreira-Strixino
Curcumin (CUR) is a naturally occurring pigment, poorly soluble in water and object of intense interest due to its multifaceted therapeutic and phototherapeutic activity. In this contribution bovine serum albumin nanoparticles (BSA-NPs) with oppositely charged surface have been used as suitable nanocarriers both to overcome the poor water solubility of CUR and to encourage its interaction with Gram-positive and Gram-negative bacteria. The different surface charge of the BSA-NPs does not affect neither the spectroscopic nor the photochemical behaviour of the encapsulated CUR which in all cases is almost exclusively present as diketo form rather than the enolic one. This strictly dictates the response of CUR to blue light excitation which, under these conditions, exhibits the usual reactivity of carbonylic compounds toward molecules that behave as hydrogen donors such as the BSA-NPs components. Steady-state and time-resolved photochemical experiments show that the encapsulated CUR undergoes photodecomposition with rate basically independent by the presence of oxygen. The photodecomposition seems to be mediated mainly by an intermolecular H-abstraction from the components of the nanocarrier by the lowest excited triplet state of CUR with the formation of the corresponding ketyl radical occurring in less than 0.5 µs. This radical is oxidized by molecular oxygen, likely leading to peroxyl and hydroperoxyl radical species, probably responsible for the photodynamic action. Accordingly with the short triplet lifetime, no singlet oxygen photogeneration is observed. Concentrations of 0.2, 0.3 and 0.4 μM were selected for in vitro tests. Internalization of both formulations was observed in strains of A. baumannii and S. aureus, after 15 minutes of interaction. After irradiation, a reduction in the viability of bacteria was observed, at the different concentrations tested, with concentrations of 0.4 and 0.3 μM being the most efficient.
姜黄素（CUR）是一种天然色素，难溶于水，因其具有多方面的治疗和光疗活性而备受关注。在本文中，具有相反电荷表面的牛血清白蛋白纳米颗粒（BSA-NPs）被用作合适的纳米载体，既克服了 CUR 水溶性差的问题，又促进了 CUR 与革兰氏阳性和革兰氏阴性细菌的相互作用。BSA-NPs 不同的表面电荷既不会影响封装 CUR 的光谱特性，也不会影响其光化学特性。这严格决定了 CUR 对蓝光激发的反应，在这些条件下，CUR 对 BSA-NPs 成分等作为氢供体的分子表现出通常的羰基化合物反应性。稳态和时间分辨光化学实验表明，封装的 CUR 会发生光分解，分解速率基本不受氧气存在的影响。光分解似乎主要是由 CUR 的最低激发三重态从纳米载体成分中分子间萃取 H 介导的，在不到 0.5 µs 的时间内就会形成相应的酮基自由基。这种自由基被分子氧氧化后，可能会产生过氧自由基和氢过氧自由基，从而产生光动力作用。由于三重态寿命较短，因此没有观察到单线态氧的光生成。体外试验选择的浓度分别为 0.2、0.3 和 0.4 μM。经过 15 分钟的相互作用后，在鲍曼尼杆菌和金黄色葡萄球菌菌株中观察到了两种制剂的内化。辐照后，在不同的测试浓度下，细菌的存活率都有所下降，其中 0.4 和 0.3 μM 的浓度最为有效。
{"title":"Curcumin-loaded bovine serum albumin (BSA) nanoparticles: photoreactivity and photodynamic action against Acinetobacter baumanni and Staphylococcus aureus","authors":"Juliana Guerra Pinto, Francesca Laneri, Isabelle de Paula Ribeiro Brambilla, Maria Clara Barbosa Silva de Azevedo, Jéssica A. R. Ambrósio, Andreza S Ribeiro, Aurore Fraix, Salvatore Sortino, Juliana Ferreira-Strixino","doi":"10.1039/d4nj01576b","DOIUrl":"https://doi.org/10.1039/d4nj01576b","url":null,"abstract":"Curcumin (CUR) is a naturally occurring pigment, poorly soluble in water and object of intense interest due to its multifaceted therapeutic and phototherapeutic activity. In this contribution bovine serum albumin nanoparticles (BSA-NPs) with oppositely charged surface have been used as suitable nanocarriers both to overcome the poor water solubility of CUR and to encourage its interaction with Gram-positive and Gram-negative bacteria. The different surface charge of the BSA-NPs does not affect neither the spectroscopic nor the photochemical behaviour of the encapsulated CUR which in all cases is almost exclusively present as diketo form rather than the enolic one. This strictly dictates the response of CUR to blue light excitation which, under these conditions, exhibits the usual reactivity of carbonylic compounds toward molecules that behave as hydrogen donors such as the BSA-NPs components. Steady-state and time-resolved photochemical experiments show that the encapsulated CUR undergoes photodecomposition with rate basically independent by the presence of oxygen. The photodecomposition seems to be mediated mainly by an intermolecular H-abstraction from the components of the nanocarrier by the lowest excited triplet state of CUR with the formation of the corresponding ketyl radical occurring in less than 0.5 µs. This radical is oxidized by molecular oxygen, likely leading to peroxyl and hydroperoxyl radical species, probably responsible for the photodynamic action. Accordingly with the short triplet lifetime, no singlet oxygen photogeneration is observed. Concentrations of 0.2, 0.3 and 0.4 μM were selected for in vitro tests. Internalization of both formulations was observed in strains of A. baumannii and S. aureus, after 15 minutes of interaction. After irradiation, a reduction in the viability of bacteria was observed, at the different concentrations tested, with concentrations of 0.4 and 0.3 μM being the most efficient.","PeriodicalId":95,"journal":{"name":"New Journal of Chemistry","volume":null,"pages":null},"PeriodicalIF":3.3,"publicationDate":"2024-07-02","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141501345","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"化学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
The pursuit of developing highly potent and environmentally friendly photocatalysts for water dissociation is crucial for the advancement and storage of unlimited solar energy, though this remains a massive challenge. Herein, we conducted a screening process for the photocatalytic water splitting capabilities of a multitude of members from the extensive MA2N4 family. Through first-principles calculations, we find MoSi2N4, WSi2N4 and WGe2N4 structures with excellent potential in photocatalytic applications. To be specific, these members possess characteristics of semiconductors, featuring an suitable band gaps structure and pronounced optical absorption capabilities in the UV-visible light spectrum. Our findings suggest that with nitrogen vacancies present on the surface, MoSi2N4, WSi2N4, and WGe2N4 all demonstrate near zero Gibbs free energy in driving the hydrogen evolution reaction. Simultaneously, MoSi2N4, WSi2N4, and WGe2N4 can spontaneously catalyze the overall water splitting reaction under the potentials provided by light illumination when under the condition of a pH value of 4, 12, and 10, respectively. This investigation provides fresh perspectives in terms of designing highly efficient photocatalysts.
{"title":"Exploiting monolayer MoSi2N4, WSi2N4 and WGe2N4 for efficient photocatalytic overall water splitting across a broad pH range","authors":"Xuhui Yang, Hang Xue, Luteng Luo","doi":"10.1039/d4nj01105h","DOIUrl":"https://doi.org/10.1039/d4nj01105h","url":null,"abstract":"The pursuit of developing highly potent and environmentally friendly photocatalysts for water dissociation is crucial for the advancement and storage of unlimited solar energy, though this remains a massive challenge. Herein, we conducted a screening process for the photocatalytic water splitting capabilities of a multitude of members from the extensive MA2N4 family. Through first-principles calculations, we find MoSi2N4, WSi2N4 and WGe2N4 structures with excellent potential in photocatalytic applications. To be specific, these members possess characteristics of semiconductors, featuring an suitable band gaps structure and pronounced optical absorption capabilities in the UV-visible light spectrum. Our findings suggest that with nitrogen vacancies present on the surface, MoSi2N4, WSi2N4, and WGe2N4 all demonstrate near zero Gibbs free energy in driving the hydrogen evolution reaction. Simultaneously, MoSi2N4, WSi2N4, and WGe2N4 can spontaneously catalyze the overall water splitting reaction under the potentials provided by light illumination when under the condition of a pH value of 4, 12, and 10, respectively. This investigation provides fresh perspectives in terms of designing highly efficient photocatalysts.","PeriodicalId":95,"journal":{"name":"New Journal of Chemistry","volume":null,"pages":null},"PeriodicalIF":3.3,"publicationDate":"2024-07-02","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141523922","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"化学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Ali Babri Shal, Morteza Kashefi AlAsl, Shahrzad Khoramnejadian
Nitrate elimination from groundwater and surface water has received growing attention in recent years, as its gradual accumulation severely endangers freshwater reserves around the world. To this end, a new and effective zeolite-activated carbon supported MnFe2O4 magnetic nanocomposite was synthesized and used as a nanoadsorbent for nitrate removal from water for the first time in this research. Subsequently, several analytical techniques, including field emission scanning electron microscopy (FE-SEM), Fourier transform infrared (FTIR) spectroscopy and X-ray diffraction (XRD), were applied to identify the MnFe2O4@zeolite-activated carbon magnetic nanocomposite. To attain the maximum removal efficiency of nitrate, several key parameters were optimized, such as dosage of adsorbent, contact time, initial concentration, and solution pH. Kinetic studies and adsorption equilibrium analysis indicated that the pseudo-second-order model is well matched with the experimental kinetics data, while the Freundlich isotherm model provides a better representation of the nitrate adsorption process. The outcomes displayed that the MnFe2O4@zeolite-activated carbon magnetic nanocomposite is a promising nanoadsorbent for the elimination of nitrate from water.
{"title":"Adsorptive removal of nitrate from aqueous solution using a MnFe2O4@zeolite-activated carbon magnetic nanocomposite: isotherm and kinetics studies","authors":"Ali Babri Shal, Morteza Kashefi AlAsl, Shahrzad Khoramnejadian","doi":"10.1039/d3nj05875a","DOIUrl":"https://doi.org/10.1039/d3nj05875a","url":null,"abstract":"Nitrate elimination from groundwater and surface water has received growing attention in recent years, as its gradual accumulation severely endangers freshwater reserves around the world. To this end, a new and effective zeolite-activated carbon supported MnFe<small><sub>2</sub></small>O<small><sub>4</sub></small> magnetic nanocomposite was synthesized and used as a nanoadsorbent for nitrate removal from water for the first time in this research. Subsequently, several analytical techniques, including field emission scanning electron microscopy (FE-SEM), Fourier transform infrared (FTIR) spectroscopy and X-ray diffraction (XRD), were applied to identify the MnFe<small><sub>2</sub></small>O<small><sub>4</sub></small>@zeolite-activated carbon magnetic nanocomposite. To attain the maximum removal efficiency of nitrate, several key parameters were optimized, such as dosage of adsorbent, contact time, initial concentration, and solution pH. Kinetic studies and adsorption equilibrium analysis indicated that the pseudo-second-order model is well matched with the experimental kinetics data, while the Freundlich isotherm model provides a better representation of the nitrate adsorption process. The outcomes displayed that the MnFe<small><sub>2</sub></small>O<small><sub>4</sub></small>@zeolite-activated carbon magnetic nanocomposite is a promising nanoadsorbent for the elimination of nitrate from water.","PeriodicalId":95,"journal":{"name":"New Journal of Chemistry","volume":null,"pages":null},"PeriodicalIF":3.3,"publicationDate":"2024-07-02","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141523923","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"化学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Although the preparation of large-area perovskite films by blade-coating technology has made rapid progress in recent years, the instability of precursor solutions and the harmful and toxic solvents limit the preparation of bladed perovskite films in ambient air. In addition, additives are usually indispensable for the preparation of high-quality bladed perovskite films. Here, we introduce the ionic liquid methylammonium acetate (MAAc) to instead of N,N-dimethylformamide and dimethyl sulfoxide as solvent to fabricate perovskite solar cells (PSCs) by blade-coating method. Using MAAc as a solvent solves the toxic and harmful problems of traditional solvents and realizes the preparation process of bladed perovskite films in ambient air. Surprisingly, the power conversion efficiency of the bladed PSCs prepared under ambient condition exceeds 14% without additives. Moreover, the unencapsulated device exhibits excellent storage stability in ambient air. This work provides a method for preparing high efficient and stable perovskite optoelectronic devices by blade-coating method in ambient air without additives.
{"title":"A Green Ionic Liquid Solvent for Additive-free, Efficient and Stable Bladed Perovskite Solar Cells in Ambient Condition","authors":"Huanqin Yu, Bingqiang Cao","doi":"10.1039/d4nj01972e","DOIUrl":"https://doi.org/10.1039/d4nj01972e","url":null,"abstract":"Although the preparation of large-area perovskite films by blade-coating technology has made rapid progress in recent years, the instability of precursor solutions and the harmful and toxic solvents limit the preparation of bladed perovskite films in ambient air. In addition, additives are usually indispensable for the preparation of high-quality bladed perovskite films. Here, we introduce the ionic liquid methylammonium acetate (MAAc) to instead of N,N-dimethylformamide and dimethyl sulfoxide as solvent to fabricate perovskite solar cells (PSCs) by blade-coating method. Using MAAc as a solvent solves the toxic and harmful problems of traditional solvents and realizes the preparation process of bladed perovskite films in ambient air. Surprisingly, the power conversion efficiency of the bladed PSCs prepared under ambient condition exceeds 14% without additives. Moreover, the unencapsulated device exhibits excellent storage stability in ambient air. This work provides a method for preparing high efficient and stable perovskite optoelectronic devices by blade-coating method in ambient air without additives.","PeriodicalId":95,"journal":{"name":"New Journal of Chemistry","volume":null,"pages":null},"PeriodicalIF":3.3,"publicationDate":"2024-07-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141523698","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"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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