检索结果-内蒙古大学图书馆

Effect of pyrolysis temperature on characteristics of tunable magnetic biochar synthesized from watermelon rind and its tetracycline adsorption performance

引用

Journal of the Taiwan Institute of chemical Engineers 2024年 160卷

作者： Thairattananon, Phisit Le, Giang T.T. Matsumura, Yukihiko Wu, Kevin C.W. Charinpanitkul, Tawatchai Department of Chemical Engineering Faculty of Engineering Center of Excellence in Particle and Material Processing Technology Chulalongkorn University Bangkok10330 Thailand Institute of Fundamental and Applied Sciences Duy Tan University Ho Chi Minh700000 Viet Nam Faculty of Environmental and Chemical Engineering Duy Tan University Da Nang550000 Viet Nam Mechanical Engineering Program Graduate School of Advanced Science and Engineering Kagamiyama Hiroshima Higashi-Hiroshima739-8527 Japan Department of Chemical Engineering National Taiwan University Taipei10617 Taiwan Department of Chemical Engineering and Materials Science Yuan Ze University Chung-Li Taoyuan Taiwan Research Network of NANOTEC-KU on Nanocatalyst and Nanomaterials for Sustainable Energy and Environment Bangkok10900 Thailand

Background: Tetracycline is an emerging contaminant in water reservoirs, causing undesirable influences on human society. The promising usage of magnetic biochar (MBC) derived from watermelon rind has been explored in the adsorption of various contaminants owing to its high specific surface area and separability;however, the temperature-dependent changes of MBC and its sorption ability toward antibiotics have not been widely examined. Method: Tunable MBCs could be synthesized via simple pyrolysis of watermelon rind impregnated with FeCl3 at different temperatures (700–900 °C). The as-synthesized MBCs were characterized using scanning electron microscopy (SEM), an elemental analyzer, N2 adsorption/desorption, Fourier-transform infrared spectroscopy (FTIR), Raman spectroscopy, X-ray diffractometry (XRD), and vibrating sample magnetometry (VSM). Then Tetracycline, an emerging contaminant in water reservoirs, was employed as the target contaminant, while adsorption kinetics, isotherm, the effect of pH, and reusability were investigated. Significant findings: The tunability of as-synthesized MBCs could be observed by their distinct changes in structural characteristics when varying pyrolysis temperature. MBC synthesized at 900 °C (MBC900) possessed a high-specific surface area (401 m2.g−1) and saturation magnetization (55.29 emu.g−1), resulting in a greater amount of sorption sites. Tetracycline adsorption by MBCs followed a pseudo-second-order kinetic model and fitted well with the Freundlich model. MBC900 is an excellent adsorbent with a maximum adsorption capacity of 77.6 mg.g−1 and could be used for at least five cycles with an insignificant decrease in the adsorption capacity. © 2024 Taiwan Institute of chemical Engineers

关键词： Adsorption

来源：评论

学校读者我要写书评

暂无评论

Cobalt-containing covalent organic frameworks for visible light-driven hydrogen evolution

引用

science China Chemistry 2020年第2期63卷 192-197页

作者： Jian Wang Jian Zhang Shing Bo Peh Guoliang Liu Tanay Kundu Jinqiao Dong Yunpan Ying Yuhong Qian Dan Zhao Department of Chemical and Biomolecular Engineering National Universityof SingaporeSingapore 117585Singapore School ofChemistry and Materials Science Jiangsu Normal UniversityXuzhou 221116China

Covalent organic frameworks(COFs) have recently emerged as a new class of ***,integrated design is crucial to maximizing the performance of COF-incorporating photocatalytic ***,we compare two strategies of installing earth-abundant metal-based catalytic centers into the matrice of a 2 D COF named *** to NUS-55(Co)prepared from the post-synthetic metalation of coordination sites within the COF,the molecular co-catalyst impregnated NUS-55/[Co(bpy)3]Cl2 achieves a seven-fold improvement in visible light-driven H2 evolution rate to 2,480 μmol g^-1h^-1,with an apparent quantum efficiency(AQE) of 1.55% at 450 *** results show that the rational design of molecular anchoring sites in COFs for the introduction of catalytic metal sites can be a viable strategy for the development of highly efficient photocatalysts with enhanced stability and photocatalytic activities.

关键词： covalent organic frameworks(COFs) photocatalytic H2 evolution non-precious-metal post-synthetic modification Co(Ⅱ)-cooperation

来源：评论

学校读者我要写书评

暂无评论

Interfacial Diffusion Manipulation by Amphiphilic Cellulose Nanocrystal Having Antibacterial Property for Asymmetric Polyamide Layer

SSRN

引用

SSRN 2023年

作者： Seo, Huiran Shin, Huiseob Kong, Saerom Jung, Kyung Hwa Kim, Mun Hyeon Kim, Jae Jun Lee, Changha Kim, Hee Joong Lee, Jong-Chan Department of Chemical and Biological Engineering Institute of Chemical Processes Seoul National University 1 Gwanak-ro Seoul08826 Korea Republic of Department of Polymer Science and Engineering & Program in Environmental and Polymer Engineering Inha University Incheon22212 Korea Republic of

Polyamide (PA) thin-film composite (TFC) membranes, fabricated by interfacial polymerization (IP) process, have been widely used for the desalination process due to high water permeability with high water/salt selectivity. A number of advanced PA TFC membranes have been developed as more efficient alternatives to further improve separation performance, scalability, and address the surface contamination problem of commercial membranes. Here, we utilized amphiphilic functionalized cellulose nanocrystal (f-CNC) having antibacterial property as a nanofiller material for the preparation of an advanced PA membrane system, featuring improved water permeability with high salt rejection ability. This strategy is inexpensive, scalable, environmentally friendly, and practically relevant, given that typical IP process with a renewable nanofiller was employed. The amphiphilic f-CNC manipulates interfacial diffusion of monomers upon IP process, thereby decreasing the effective PA layer thickness by 30 % and increasing water permeability by 44 %. In addition, the PA membrane with f-CNC showed improved antibacterial and antifouling properties due to the specific nature of f-CNC. This study provides insights for the development of thin, effective, and antibacterial, yet more green and scalable PA membrane alternatives to the conventional desalination membranes. © 2023, The Authors. All rights reserved.

关键词： Cellulose

来源：评论

学校读者我要写书评

暂无评论

Enhanced Capacitance in Surfactant Mediated Ion Complexes

arXiv

引用

arXiv 2023年

作者： Chen, Jihua Espera, Alejandro Carrillo, Jan Michael Y. Advincula, Rigoberto Center for Nanophase Materials Science Oak Ridge National Laboratory United States Engineering Fundamentals Tickle College of Engineering The University of Tennessee Knoxville United States Department of Chemical and Biomolecular Engineering University of Tennessee Knoxville United States

Ion complexes hold the key for various energy transfer and communication systems in nature and industries. Achieving controllable mechanical and electrical properties in these complex systems is highly desirable but remains challenging. In this work, we propose the use of amphiphilic molecules to mediate salt crystallization. The resultant ionic interfaces can be tunable through reduced surface tensions of crystal facets, an additional intermolecular modifier, and the diffusion-limited crystallization during controlled solvent evaporation. Specifically, we utilized the ionic surfactant Sodium Lauryl sulfoacetate (SLSA) to mediate the crystallization of sodium chloride. Citric acid (CA) was adopted as a hydrogen-bond modifier. Systems mediated by SLSA exhibited the highest capacitance, and a significant enhancement of capacitance was also observed in systems with both SLSA and CA. The substantially increased capacitance of these ionic complexes can be attributed to changes in interfacial and crystalline grain structures. Transmission electron microscopy (TEM), optical microscopy (OM), and Finite Element Analysis (FEA) were used to study the effects of surfactant molecules in these ionic complexes. Understanding the role of ionic complexation in defining the thermodynamic and kinetic process of the crystallization process will contribute to better optimization in nucleation and scalability of organic and inorganic crystal production. © 2023, CC BY.

关键词： Hydrogen bonds

来源：评论

学校读者我要写书评

暂无评论

Hydrogenation of Bio-Oil Oxygenates at Ambient Conditions via a Two-Step Redox Cycle

SSRN

引用

SSRN 2023年

作者： Ruan, Chongyan Akutsu, Ryota Yang, Kunran Zayan, Noha M. Dou, Jian Liu, Junchen Bose, Arnab Brody, Leo Lamb, H. Henry Li, Fanxing Department of Chemical and Biomolecular Engineering North Carolina State University RaleighNC United States Chemistry and Materials Division Department of Textile Science and Technology Shinshu University Japan

A key challenge in upgrading bio-oils to renewable fuels and chemicals resides in developing effective and versatile hydrogenation systems. Herein, we report a two-step solar thermochemical hydrogenation process that sources hydrogen directly from water and concentrated solar radiation for furfural and bio-oils upgrading. Superior catalytic performance was achieved at room temperature and atmospheric pressure, with up to two orders of magnitude higher H2 utilization efficiency compared to state-of-the-art catalytic hydrogenation. A metal or reduced metal oxide, obtainable from solar thermal or electrochemical reduction, provides the active sites for furfural adsorption and H2O dissociation. Fundamentally different from conventional hydrogenation, the in situ generated reactive H atoms hydrogenate furfural and biomass-derived oxygenates, eliminating the barriers for H2 dissolution and mass transfer in the reaction medium and the subsequent dissociation at the catalyst surface. The hydrogenation selectivity can be conveniently mediated by solvents with different polarity and metal/reduced metal oxide catalysts with varying oxophilicity, adding extra dimensions in manipulating the product distribution. This work provides an efficient and versatile strategy for bio-oils upgrading and a promising pathway for renewable energy storage. The generalized approach is also shown to be extendable to catalytic upgrading of other platform compounds with similar functional groups. © 2023, The Authors. All rights reserved.

关键词： Hydrogenation

来源：评论

学校读者我要写书评

暂无评论

Hydrate-Based Energy Storage: Studying Mixed Ch4/1,3-Dioxane Hydrates Via Thermodynamic Modeling, In-Situ Raman Spectroscopy, and Macroscopic Kinetics

SSRN

引用

SSRN 2024年

作者： Sun, Jiyue Zhang, Ye Bhattacharjee, Gaurav Li, Xiaosen Jiang, Lei Linga, Praveen Guangzhou Institute of Energy Conversion Chinese Academy of Sciences Guangzhou510640 China Institute of Deep-sea Science and Engineering Chinese Academy of Sciences Sanya572000 China Department of Chemical and Biomolecular Engineering National University of Singapore Singapore117585 Singapore

The global demand for natural gas (NG) is anticipated to rise in the upcoming decades. Solidified Natural Gas (SNG) provides an alternative solution for the storage and transportation of NG, boasting high energy density and efficiency. Fundamental experiments and modeling endeavors are undertaken herein, focusing on diverse concentrations of 1,3-dioxane, a low-toxicity promoter, and L-tryptophan for investigating mixed sII hydrate formation. The equilibrium data and dissociation enthalpies for mixed CH4/dioxane hydrate are obtained. A van der Waals and Platteeuw (vdW–P) based thermodynamic model is developed for accurate prediction of equilibrium data, yielding an average absolute deviation ranging from 1.7% to 3.9% The quantitative analysis of the in-situ Raman spectra reveals a two-stage growth mechanism for mixed CH4/dioxane hydrates. A high gas uptake of 91.1 (±0.5) v/v is achieved using a 5.56 mol% dioxane solution at 287.15 K and 10.0 MPa. Additionally, the incorporation of 1000 ppm L-tryptophan reduces the time to reach 90% uptake (t90) to 19.9 (±1.8) minutes. The findings obtained contribute to the development of a commercially viable NG storage system. © 2024, The Authors. All rights reserved.

关键词： Raman spectroscopy

来源：评论

学校读者我要写书评

暂无评论

Preclinical Assessment of Enhanced Chemodynamic Therapy by an FeMnOx-Based Nanocarrier: Tumor-Microenvironment-Mediated Fenton Reaction and ROS-Induced Chemotherapeutic for Boosted Antitumor Activity

引用

ACS Applied Materials and Interfaces 2023年第48期15卷 55258-55275页

作者： Dirersa, Worku Batu Kan, Tzu-Chun Getachew, Girum Wibrianto, Aswandi Ochirbat, Sonjid Rasal, Akash Chang, Jungshan Chang, Jia-Yaw Department of Chemical Engineering National Taiwan University of Science and Technology Taiwan Taipei106335 Taiwan Graduate Institute of Medical Sciences College of Medicine Taipei Medical University Taipei11031 Taiwan International Master/Ph.D. Program in Medicine College of Medicine Taipei Medical University Taipei11031 Taiwan International Ph.D. Program for Cell Therapy and Regeneration Medicine College of Medicine Taipei Medical University Taipei11031 Taiwan

In recent studies, iron-containing Fenton nanocatalysts have demonstrated significant promise for clinical use due to their effective antitumor activity and low cytotoxicity. A new approach was reported in this work utilizing cation exchange synthesis to fabricate FeMnOx nanoparticles (NPs) that boost Fenton reactions and responses to the tumor microenvironment (TME) for chemodynamic therapy (CDT) and chemotherapy (CT). Within the TME, the redox metal pair of Fe2+/Mn2+ helps break down endogenous hydrogen peroxide (H2O2) into very harmful hydroxyl radicals (•OH) while simultaneously deactivating glutathione (GSH) to boost CDT performance. To further enhance the therapeutic potential, FeMnOx NPs were encapsulated with thioketal-linked camptothecin (CPT-TK-COOH), a reactive oxygen species (ROS)-responsive prodrug, achieving a high CPT-loading capacity of up to 51.1%. Upon ROS generation through the Fenton reaction, the prodrug TK linkage was disrupted, releasing 80% of the CPT payload within 48 h. Notably, FeMnOx@CPT exhibited excellent dual-modal imaging capabilities, enabling magnetic resonance and fluorescence imaging for image-guided therapy. In vitro studies showed the cytocompatibility of FeMnOx NPs using MDA-Mb-231 and 4T1 cells, but in the presence of H2O2, they induced significant cytotoxicity, resulting in 80% cell death through CDT and CT effects. Upon intravenous administration, FeMnOx@CPT displayed remarkable tumor accumulation, which enhanced tumor suppression in xenografts through improved CDT and CT effects. Moreover, no significant adverse effects were observed in the FeMnOx NP-treated animals. In the current study, the FeMnOx@CPT anticancer platform, with its boosted •OH-producing capability and ROS-cleavable drug release, has been validated utilizing in vitro and animal studies, suggesting its capacity as a viable strategy for clinical trials. © 2023 American chemical Society.

关键词： Chemotherapy

来源：评论

学校读者我要写书评

暂无评论

Exotic surface magnetotransport phenomena in the antiferromagnetic Mott insulator NiS2

引用

Physical Review Materials 2023年第10期7卷 104401-104401页

作者： Sami El-Khatib Faisal Mustafa Mehmet Egilmez Bhaskar Das Yu Tao Moumita Maiti Yeon Lee Chris Leighton Department of Physics American University of Sharjah Sharjah PO Box 26666 United Arab Emirates Materials Science and Engineering Program American University of Sharjah Sharjah PO Box 26666 United Arab Emirates Department of Chemical Engineering and Materials Science University of Minnesota Minneapolis Minnesota 55455 USA

The pyrite-structure transition-metal disulfide NiS2 is in principle a model cubic antiferromagnetic Mott insulator that can be doped through insulator-metal transitions with both electrons and holes (in Ni1–xCuxS2 and Ni1–xCoxS2), eventually inducing superconductivity and ferromagnetism, respectively. Magnetism and transport have proven challenging to understand in NiS2, however. The antiferromagnetic spin structure below ∼39K is complex due to frustration, while unexplained weak ferromagnetism emerges below ∼30K. Surface conduction is also now understood to dominate in NiS2 at low temperatures, raising questions about the interpretation of decades of prior data. Here, we present a complete study of the surface magnetotransport phenomena that emerge at low temperatures in high-quality single-crystal NiS2, which turn out to be strikingly rich. On cooling, isotropic magnetoresistance due to a field-induced shift of the first-order weak ferromagnetic ordering transition is first uncovered, i.e., metamagnetic magnetoresistance. At lower temperatures, larger, anisotropic magnetoresistance effects arise due to distinct switching events associated with the weak ferromagnetism. Strong evidence is presented that this is due to a field-driven in-plane to out-of-plane reorientation of surface spins, likely correlated with surface steps and terraces. In-plane exchange bias accompanies these effects, further supporting this interpretation. At the lowest temperatures, the spin reorientation field eventually exceeds the 9-T measurement window, generating strongly field-asymmetric magnetoresistance. Some of these unusual phenomena also manifest in the Hall channel, culminating in a sizable anomalous Hall effect at low temperatures. These results significantly demystify recent magnetoresistance and magnetic microscopy observations in NiS2 crystals and nanoflakes, and constitute an important step in elucidating the complex electronic and magnetic properties of this pivotal antiferro

关键词： Electrical properties Electronic structure Magnetism Antiferromagnets Ferromagnets Mott insulators Magnetic techniques Transport techniques

来源：评论

学校读者我要写书评

暂无评论

Importance of Standardizing Analytical Characterization Methodology for Improved Reliability of the Nanomedicine Literature

引用

Nano-Micro Letters 2022年第11期14卷 18-32页

作者： Shahriar Sharifi Nouf N.Mahmoud Elizabeth Voke Markita P.Landry Morteza Mahmoudi Department of Radiology and Precision Health Program Michigan State UniversityEast LansingMIUSA Faculty of Pharmacy Al-Zaytoonah University of JordanAmman 11733Jordan Department of Biomedical Sciences College of Health SciencesQU HealthQatar University2713 DohaQatar Department of Chemical and Biomolecular Engineering University of CaliforniaBerkeleyBerkeleyCAUSA Innovative Genomics Institute BerkeleyCAUSA California Institute for Quantitative Biosciences University of CaliforniaBerkeleyCAUSA Chan Zuckerberg Biohub San FranciscoCAUSA

Understanding the interaction between biological structures and nanoscale technologies,dubbed the nano-bio interface,is required for successful development of safe and efficient nanomedicine *** lack of a universal reporting system and decentralized methodologies for nanomaterial characterization have resulted in a low degree of reliability and reproducibility in the nanomedicine *** such,there is a strong need to establish a characterization system to support the reproducibility of nanoscience data particularly for studies seeking clinical ***,we discuss the existing key standards for addressing robust characterization of nanomaterials based on their intended use in medical devices or as *** also discuss the challenges surrounding implementation of such standard protocols and their implication for translation of nanotechnology into clinical ***,however,emphasize that practical implementation of standard protocols in experimental laboratories requires long-term planning through integration of stakeholders including institutions and funding agencies.

关键词： Characterization Nanomedicine Standard protocols Reproducibility Nanomedicine devices

来源：评论

学校读者我要写书评

暂无评论

Selective Gas Permeation Through Polymer-Hybridized Graphene Oxide Nanoribbon Nanochannels: Towards Enhanced H2/Co2 Selectivity

SSRN

引用

SSRN 2023年

作者： Ji, Hyungjoon Choi, Yunkyu Choi, Wooyoung Choi, Eunji Kim, Minsu Kim, Ju Yeon Kwon, Ohchan Ji, Yunseong Kim, Dae Woo Department of Chemical and Biomolecular Engineering YONSEI University Seoul03722 Korea Republic of Materials Research Laboratory Department of Material Science and Engineering Beckman Institute for Advanced Science and Technology University of Illinois Urbana-Champaign UrbanaIL61801 United States

Two-dimensional materials have garnered significant attention as membrane building blocks for their tunability, which enables simultaneous enhancement of permeance and selectivity. This study investigates the impact of reduced nanosheet width on H2/CO2 separation by examining the gas permeation behavior of graphene oxide nanoribbon (GONR)/polymer hybrid membranes. Polymers are incorporated into the macroporous GONR scaffold to accelerate H2 transport due to the expansion of GONR nanochannels. The GONR/polymer scaffolds can be coated on porous support by using the scalable shear coating method, resulting in micrometer-scale selective layers. The carbon layers remain intact after polymer hybridization and inhibit polymer crystallization, allowing strong polymer-CO2 interactions to hinder CO2 permeation. However, the excessive polymer composition can compromise GONR-polymer hybridization and crystallization suppression. We also explore the effect of polymer charge on gas separation performance. A relatively small amount of cationic polymer enhances H2/CO2 selectivity, but the enhancement is limited due to strong electrostatic interactions. Anionic polymer-GONR hybridization also improves gas separation performance, but is less effective compared to neutral polymer, as repulsive interactions result in a looser structure. The gas separation performance of the optimized membrane (GONR/PEO 25 wt%) shows H2 permeability of 7,108 Barrer and H2/CO2 selectivity of 10.8, surpassing the Robeson upper bound for polymeric membranes and comparable to that of previous 2D-materials-based membranes. Our finding demonstrates that GONR nanochannels and their gas transport properties can be tuned by simply adding polymers depending on the quantity, molecular weight, and charge of the polymers. © 2023, The Authors. All rights reserved.

关键词： Graphene

来源：评论

学校读者我要写书评

暂无评论

建议与咨询留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

时间限定

文献类型

馆藏选择

核心期刊

语言

文献类型

帮助

文字说明：

检索规则说明：

检索范例：

分类表

所选分类

限定检索结果

文献类型

馆藏范围

日期分布

学科分类号

主题

机构

作者

语言

请选择保存的检索档案：

请选择收藏分类：

通借通还

建议与咨询 留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

时间限定

文献类型

馆藏选择

核心期刊

语言

文献类型

帮助

文字说明：

检索规则说明：

检索范例：

分类表

所选分类

限定检索结果

文献类型

馆藏范围

日期分布

学科分类号

主题

机构

作者

语言

请选择保存的检索档案： 新增检索档案 确定 取消

请选择收藏分类： 新增自定义分类 确定 取消

通借通还

建议与咨询留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

请选择保存的检索档案：

请选择收藏分类：