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Addendum: Self-operating transpiration-driven electrokinetic power generator with an artificial hydrological cycle

Energy & Environmental science 2024年第3期17卷 1292-1293页

作者： Jaehyeong Bae Tae Gwang Yun Bong Lim Suh Jihan Kim Il-Doo Kim Department of Materials Science and Engineering Korea Advanced Institute of Science and Technology (KAIST) 291 Daehak-ro Yuseong-gu Daejeon Republic of Korea Department of Chemical and Biomolecular Engineering Korea Advanced Institute of Science and Technology (KAIST) 291 Daehak-ro Yuseong-gu Daejeon Republic of Korea

Addendum for ‘Self-operating transpiration-driven electrokinetic power generator with an artificial hydrological cycle’ by Jaehyeong Bae et al., Energy Environ. Sci., 2020, 13, 527–534, https://***/10.1039/C9EE02616A.

Addendum for ‘Self-operating transpiration-driven electrokinetic power generator with an artificial hydrological cycle’ by Jaehyeong Bae et al., Energy Environ. Sci., 2020, 13, 527–534, https://***/10.1039/C9EE02616A.

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Structural evaluation of Poly(lactic acid) degradation at standardized composting temperature of 58 degrees

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Chemosphere 2024年 354卷 141729页

作者： Oh, Jiwon Park, Sung Bae Cha, Chaenyung Hwang, Dong Ki Park, Seul-A Park, Jeyoung Oh, Dongyeop X. Jeon, Hyeonyeol Koo, Jun Mo Ulsan44429 Korea Republic of Ulsan44919 Korea Republic of Pohang37673 Korea Republic of Department of Chemical and Biomolecular Engineering Sogang University Seoul04107 Korea Republic of Department of Polymer Science and Engineering and Program in Environmental and Polymer Engineering Inha University Incheon22212 Korea Republic of Daejeon34113 Korea Republic of Department of Organic Materials Engineering Chungnam National University Daejeon34134 Korea Republic of

The accumulation of petroleum-based plastics on our planet is causing serious environmental pollution. Biodegradable plastics, promoted as eco-friendly solutions, hold the potential to address this issue. However, their impact on the environment and the mechanisms of their natural degradation remain inadequately understood. Furthermore, the specific conditions set forth in international standards for evaluating the biodegradability of biodegradable plastics have led to misconceptions about their real-world behavior. To properly elucidate the relationship between their degradability and structure, this study mimics the thermal effect on poly(lactic acid) (PLA) under standardized composting temperature. The higher the crystallinity of PLA, the lower the degradation rate, which suggests that crystallinity is a key factor in determining degradation. The composting temperature of 58 °C induces crystallization by having a structural effect on the polymer, which in turn reduces the degradation rate of PLA. Therefore, control over temperature and crystallization during the processing and degradation of PLA is crucial, as it not only determines the biodegradability but also enhances the utility. © 2024

关键词： Biodegradability

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Mixed-charged polyamide-4-sulfocalix arene hollow fiber nanofiltration membranes for heavy metal removal under various pH

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Journal of Membrane science 2024年 705卷

作者： Beshahwored, Siyum Shewakena Wang, Ying-Ting Hu, Chien-Chieh Chung, Tai-Shung Graduate Institute of Applied Science and Technology National Taiwan University of Science and Technology Taipei10607 Taiwan R & D Center for Membrane Technology Chung Yuan Christian University Taoyuan City32023 Taiwan Department of Chemical Engineering National Taiwan University of Science and Technology Taipei10607 Taiwan Department of Materials Science and Engineering National Taiwan University of Science and Technology Taipei10607 Taiwan Department of Chemical & Biomolecular Engineering National University of Singapore 4 Engineering Drive 4 117585 Singapore

The presence of heavy metal ions in water sources poses significant risks to both human health and environments;hence, it is critical to develop effective and trustworthy removal techniques. This research aims to fabricate a novel hollow fiber membrane consisting of mixed-charged characteristics via the formation of a positively charged thin film composite (TFC), followed by the infiltration of 4-sulfocalix [4] arene (SCA4). The formation, architecture and separation performance of the mixed-charged nanofiltration (NF) membrane have been confirmed by various characterizations. The SCA4-0.03 NF hollow fiber membrane shows excellent rejection performance up to 99.2 % for a variety of ion removals such as common arsenate, nickel (II), and lead (II) ions over a broad pH range. Additionally, the mixed-charged membrane exhibits higher performance stability over 48 h and fouling resistance in both basic and acidic conditions. Consequently, the mixed-charged membrane described in this work is promising to treat both cationic and anionic liquids, and eliminate a variety of ecologically harmful ion species in industries. © 2024 Elsevier B.V.

关键词： Heavy metals

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NGenE 2021: Electrochemistry Is Everywhere

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ACS ENERGY LETTERS 2022年第1期7卷 368-374页

作者： Cabana, Jordi Alaan, Thomas Crabtree, George W. Hatzell, Marta C. Manthiram, Karthish Steingart, Daniel A. Zenyuk, Iryna Jiao, Feng Vojvodic, Aleksandra Yang, Jenny Y. Balsara, Nitash P. Persson, Kristin A. Siegel, Donald J. Haynes, Christy L. Mauzeroll, Janine Shen, Mei Venton, B. Jill Balke, Nina Rodriguez-Lopez, Joaquin Rolison, Debra R. Shahbazian-Yassar, Reza Srinivasan, Venkat Chaudhuri, Santanu Couet, Adrien Hattrick-Simpers, Jason Department of Chemistry University of Illinois at Chicago Chicago Illinois 60607 United States Department of Physics University of Illinois at Chicago Chicago Illinois 60607 United States Joint Center for Energy Storage Research Argonne National Laboratory Lemont Illinois 60439 United States George W. Woodruff School of Mechanical Engineering Georgia Institute of Technology Atlanta Georgia 30332 United States Division of Chemistry and Chemical Engineering California Institute of Technology Pasadena California 91125 United States Department of Chemical Engineering Columbia University New York New York 10027 United States Columbia Electrochemical Energy Center Columbia University New York New York 10027 United States Department of Earth and Environmental Engineering Columbia University New York New York 10027 United States Department of Chemical and Biomolecular Engineering University of California Irvine California 92697 United States Center for Catalytic Science and Technology Department of Chemical and Biomolecular Engineering University of Delaware Newark Delaware 19716 United States Department of Chemical and Biomolecular Engineering University of Pennsylvania Philadelphia Pennsylvania 19104 United States Department of Chemistry University of California Irvine California 92697 United States Department of Chemical and Biomolecular Engineering University of California Berkeley California 94720 United States Materials Science Division Lawrence Berkeley National Laboratory Berkeley California 94720 United States Molecular Foundry Lawrence Berkeley National Laboratory Berkeley California 94720 United States Department of Materials Science and Engineering University of California Berkeley California 94720 United States Walker Department of Mechanical Engineering University of Texas at Austin Austin Texas 78712 United States Department of Chemistry University of Minnesota Minneapolis Minnesota 55455 United States Department of Chemistry McGill

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Atomistic understanding of hydrogen coverage on RuO2(110) surface under electrochemical conditions from ab initio statistical thermodynamics

arXiv

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arXiv 2024年

作者： Zhang, Lei Kloppenburg, Jan Lin, Chia-Yi Mitrovic, Luka Gelin, Simon Dabo, Ismaila Schlom, Darrell G. Suntivich, Jin Hautier, Geoffroy Thayer School of Engineering Dartmouth College United States Department of Chemistry and Materials Science Aalto University Finland Smith School of Chemical and Biomolecular Engineering Cornell University United States Department of Materials Science and Engineering Cornell University United States Department of Materials Science and Engineering The Pennsylvania State University United States

Understanding the dehydrogenation of transition metal oxide surfaces under electrochemical potential is critical to the control of important chemical processes such as the oxygen evolution reaction (OER). Using first principles computations, we model the thermodynamic dehydrogenation process on RuO2(110) and compare the results to experimental cyclic voltammetry (CV) on single crystal. We use a cluster expansion model trained on ab initio energy data coupled with Monte Carlo (MC) sampling to derive the macroscopic electrochemical observables, i.e., experimental CV, from the energetics of different hydrogen coverage microstates on well-defined RuO2(110). Our model reproduces the unique "two-peaks" cyclic voltammetry observed experimentally with current density peak positions and shapes in good qualitative agreement. We show that RuO2 (110) starts as a water-covered surface with hydrogen on bridge (BRG) and coordination-unsaturated sites (CUS) at low potential (2(110) surface. We also demonstrate that the electrochemical dehydrogenation process on rutile involves multiple sites in a complex sequence of dehydrogenation. Our work highlights the use of first principles techniques coupled with statistical mechanics to model the electrochemical behavior of transition metal oxides surfaces. © 2024, CC BY.

关键词： Cyclic voltammetry

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Elevating Gas Separation Performance of Pebax-Based Membranes by Blending with a Pdms-Peo Block Copolymer for Co2 Capture and Separation

SSRN

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SSRN 2024年

作者： Liang, Can Zeng Feng, Fan Wu, Ji Chung, Neal Tai-Shung Department of Chemical & Biomolecular Engineering National University of Singapore 4 Engineering Drive 4 117585 Singapore Graduate Institute of Applied Science and Technology National Taiwan University of Science and Technology Taipei106335 Taiwan

Polymeric membranes have become an emerging technology for gas separation applications. High-performance and low-cost polymeric membranes are desirable for various industrial applications. Polymer blending is a simple and versatile method to improve the separation performance of membranes. In the present work, we have significantly improved the gas separation performance of the poly(ether-block-amide) (Pebax-1657) membrane by blending it with polydimethylsiloxane-polyethylene oxide (PDMS-PEO) block copolymers. The optimal Pebax-1657/PDMS-PEO blend membrane consists of 80 wt% PDMS-PEO (Mn = 600 g/mol, ~ 60 wt% of PEO content). It can elevate the CO2 permeability of the neat Pebax-1657 membrane by about 13 folds (1300%) from 119 to 1629 Barrer, while the CO2/N2 selectivity only decreases by around 25% from 42 to 32. Interestingly, the corresponding CO2/H2 and CO2/CH4 selectivities increase slightly to ~ 10. The remarkable enhancements in gas separation performance arise from the strong increases in the solubility of polar gas CO2 and solubility selectivity of CO2/non-polar light gas (e.g. N2) as well as a noticeable improvement in CO2 diffusivity as the PDMS-PEO loading increases. The impressive improvements in gas separation performance coupled with the commercially available and affordable raw materials (Pebax-1657 and PDMS-PEO) render the Pebax-1657/PDMS-PEO blend membrane promising and attractive to the industrial deployments and applications for CO2 capture and separation. © 2024, The Authors. All rights reserved.

关键词： Block copolymers

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Amination of biochar surface from watermelon peel for toxic chromium removal enhancement

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Chinese Journal of chemical engineering 2021年第8期34卷 199-222页

作者： Mohamed A.El-Nemr Ibrahim M.A.Ismail Nabil M.Abdelmonem Ahmed El Nemr Safaa Ragab Department of Chemical Engineering Faculty of EngineeringCairo UniversityGizaEgypt Renewable Energy Program Zewail City of Science and TechnologyEgypt Environmental Division National Institute of Oceanography and FisheriesKayet BeyEl-AnfoushyAlexandriaEgypt

Watermelon peel residues were used to produce a new biochar by dehydration *** new biochar has undergone two methods of chemical modification and the effect of this chemical modification on its ability to adsorb Cr(VI)ions from aqueous solution has been *** biochars,Melon-B,Melon-BO-NH_(2) and Melon-BO-TETA,were made from watermelon peel via dehydration with 50%sulfuric acid to give Melon-B followed by oxidation with ozone and amination using ammonium hydroxide to give Melon-BO-NH_(2) or Triethylenetetramine(TETA)to give *** prepared biochars were characterized by BET,BJH,SEM,FT-IR,TGA,DSC and EDAX *** highest removal percentage of Cr(VI)ions was 69%for Melon-B,98%for Melon-BO-NH_(2) and 99%for Melon-BO-TETA biochars of 100 mg·L^(−1) Cr(VI)ions initial concentration and 1.0 g·L^(−1) adsorbents *** unmodified biochar(Melon-B)and modified biochars(Melon-BO-NH_(2) and Melon-BO-TETA)had maximum adsorption capacities(Q_(m))of 72.46,123.46,and 333.33 mg·g^(−1),*** amination of biochar reduced the pore size of modified biochar,whereas the surface area was *** obtained data of isotherm models were tested using different error function *** Freundlich,Tempkin and Langmuir isotherm models were best fitted to the experimental data of Melon-B,Melon-BO-NH_(2) and Melon-BO-TETA,*** adsorption rate was primarily controlled by pseudo-second–order rate ***,the functional groups interactions are important for adsorption mechanisms and expected to control the adsorption *** adsorption for the Melon-B,Melon-BO-NH_(2) and Melon-BO-TETA could be explained for acid–base interaction and hydrogen bonding interaction.

关键词： Waste treatment Powder technology Citrullus lanatus Hexavalent chromium Biochar amination Adsorption

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Single atom and defect engineering of CuO for efficient electrochemical reduction of CO_(2) to C_(2)H_(4)

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SmartMat 2022年第1期3卷 194-205页

作者： Senlin Chu Changwoo Kang Woonghyeon Park Yu Han Song Hong Leiduan Hao Hao Zhang Tsz Woon Benedict Lo Alex W.Robertson Yousung Jung Buxing Han Zhenyu Sun State Key Laboratory of Organic‐Inorganic Composites Beijing University of Chemical TechnologyBeijingChina Department of Chemical and Biomolecular Engineering Korea Advanced Institute of Science and Technology(KAIST)DaejeonRepublic of Korea Department of Applied Biology and Chemical Technology The Hong Kong Polytechnic UniversityHong KongChina Department of Physics University of WarwickCoventryUK Institute of Chemistry Chinese Academy of SciencesBeijingChina

Electrochemical CO_(2) transformation to high‐value ethylene(C_(2)H_(4))at high currents and efficiencies is desired and yet remains a grand *** show for the first time that coupling single Sb atoms and oxygen vacancies of CuO enable synergistic electrocatalytic reduction of CO_(2) to C_(2)H_(4) at low *** dispersed Sb atoms occupying metal substitutional sites of CuO are synthesized under mild *** overall CO_(2) reduction faradaic efficiency(FE)reaches 89.3±1.1%with an FE toward C_(2)H_(4) exceeding 58.4%at a high‐current density of 500 mA/cm^(2).Addition of the p‐block metal is found to induce transformation of CuO from flakes to nanoribbons rich in nanoholes and oxygen vacancies,greatly enhancing CO_(2) adsorption and activation while suppressing hydrogen *** density functional theory calculations with in situ X‐ray diffraction reveal that combining Sb sites and oxygen vacancies prominently lessen the dimerization energy of adsorbed CO intermediate,thus boosting the conversion of CO_(2) to produce C_(2)H_(4).This study provides a new perspective for promoting selective C-C coupling for electrochemical CO_(2) reduction.

关键词： CO_(2)reduction copper oxide electrocatalysis ethylene single sites

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Cyclic thermal treatment parameters of bagasse particle reinforced epoxy bio-composites for sustainable applications

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Discover Polymers 2025年第1期2卷 1-22页

作者： Oladele, Isiaka Oluwole Falana, Samuel Olumide Ilesanmi Akinbamiyorin, Michael Onuh, Linus Nnabuike Taiwo, Anuoluwapo Samuel Adelani, Samson Oluwagbenga Olajesu, Olanrewaju Favor Department of Metallurgical and Materials Engineering Federal University of Technology Akure Nigeria Department of Materials Science and Engineering Iowa State University Ames USA Faculty of Materials and Chemical Engineering University of Miskolc Miskolc Hungary Department of School of Aerospace Transport and Manufacturing School of Aerospace Transport and Manufacturing Cranfield University Cranfield UK Materials Science and Engineering Program University of Colorado Boulder USA

The demand for sustainable, high-performance materials has led to increased interest in bio-based composites. However, optimizing the mechanical properties of such materials for engineering applications remains a challenge. This study addresses this gap by developing and characterizing an epoxy-based biocomposite reinforced with sugarcane bagasse particles, focusing on the influence of cyclic thermal treatment on its properties. The bagasse particles were chemically treated with 1 M NaOH to remove impurities, improve interfacial bonding with the epoxy matrix, and enhance the overall composite performance. The treated particles j were pulverized to 470 µm and incorporated into the epoxy matrix (0–20 wt%) using the hand layup method. The composites were divided into untreated and thermally treated groups, with the latter subjected to cyclic thermal treatment (100 °C for 3 h over 7 days). Mechanical, wear, and water absorption properties were evaluated, while fractured surface morphologies were analyzed using SEM. Results revealed that cyclic thermal treatment significantly enhanced the composites’ performance, with the 15 wt% heat-treated composite showing optimal properties: density of 1.102 g/cm3, flexural strength of 29.13 MPa, ultimate tensile strength of 103.50 MPa, impact strength of 3.49 kJ/m2, hardness of 64.70 HS, and wear indices of 0.034 mg. These findings demonstrate that alkali treatment and cyclic thermal treatment synergistically enhance the performance of bio-composites, making them suitable for diverse applications, including automotive, aerospace, and other engineering fields.

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Advances in powder nano-photocatalysts as pollutant removal and as emerging contaminants in water:Analysis of pros and cons on health and environment

Advanced Powder Materials

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Advanced Powder Materials 2024年第6期3卷 33-69页

作者： Sahil Thakur Abhijeet Ojha Sushil Kumar Kansal Navneet Kumar Gupta Hendrik C.Swart Junghyun Cho Andrej Kuznetsov Shuhui Sun Jai Prakash Department of Chemistry National Institute of Technology HamirpurHamirpur(H.P.)177005India Department of Materials Science and Engineering National Institute of Technology HamirpurHamirpur(H.P.)177005India Dr.S.S.Bhatnagar University Institute of Chemical Engineering and Technology Panjab UniversityChandigarh 160014India Center for Sustainable Technologies Indian Institute of Science(IISc)Gulmohar MargMathikereBengaluru 560012India Department of Physics University of the Free State(UFS)BloemfonteinZA 9300South Africa Department of Mechanical Engineering&Materials Science and Engineering Program State University of New York(SUNY)BinghamtonNY 13902-6000USA University of Oslo Department of Physics and Centre for Materials Science and NanotechnologyPO Box 1048 BlindernN-0316OsloNorway Institut National de la Recherche Scientifique(INRS)-CentreEnergie Materiaux et Telecommunications VarennesQuebec J3X 1P7Canada

Photocatalysis is an advanced oxidation process where light exposure triggers a semiconducting nanomaterial(nano-photocatalyst)to generate electron-hole(e^(-)/h^(+))pairs and free *** phenomenon is widely used for the photocatalysis-assisted removal of organic and other contaminants using wide range of nanophotocatalysts,offering an efficient approach to environmental ***,the introduction of powdered nano-photocatalysts into water systems often leads to unintended secondary pollution in the form of residual nano-photocatalysts,ion leaching,free radicals,toxic by-products *** practices potentially introduce emerging secondary contaminants into aquatic environments,posing risks to both aquatic life and human *** resulting chemical by-products and intermediates can effectively induce chronic toxicity,neurological and developmental disorders,cardiovascular defects,and intestinal ailments in humans and aquatic *** having a range of health and environmental consequences,this dark side of nano-photocatalysts has been comparatively less explored and discussed in the *** this review,the pros and cons of powder nanophotocatalysts are discussed in view of their advantages as well as disadvantages in wastewater *** discussion encompasses their classification based on composition,dimensions,structure,and activity,as well as recent advancements in improving their photocatalytic *** article also explores the recent advances on their applications in photocatalytic removal of various water pollutants/contaminants of emerging concern(i.e.,organic pollutants,micro/nano plastics,heavy ions,disinfections,etc.)Furthermore,an emphasis on the role of such nano-photocatalysts as emerging(secondary)contaminants in water system,along with a thorough discussion of latest studies related to the health and environmental issues,has been ***,it addresses critical issues in applying powder nano-photo

关键词： Powder nano-photocatalysts Advanced oxidation processes Wastewater treatment Pros and cons Emerging contaminants Health and environment issues

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