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Production and characterization of polymeric nanocomposite foams based on starch and cellulose nanofibers from oil palm mesocarp fiber

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Applied Nanoscience (Switzerland) 2025年第2期15卷 1-11页

作者： Souza, Mariana Costa Gonçalves, Ana Paula Bispo da Silva Oliveira, Emanoel Igor dos Santos, Juscivaldo Passos Lazzari, Lídia Kunz Zattera, Ademir José José, Nadia Mamede Chemical Engineering Graduate Program Polytechnic School Federal University of Bahia Bahia Salvador Brazil Department of Education Federal Institute of Education Science and Technology Feira de Santana Bahia Brazil Postgraduate Program in Process Engineering and Technologies University of Caxias Do Sul Rio Grande Do Sul Caxias Do Sul Brazil

The demand for sustainable and eco-friendly materials has promoted studies over the years to explore different polymeric materials that meet requirements such as biodegradability and sustainability. In this context, biopolymer materials based on cellulose nanoparticles and starch from different botanical sources have been investigated, aiming to achieve satisfactory performance. The present study aims to develop and characterize cassava starch foams based on density, scanning electron microscopy (SEM), and three-point flexure tests, and to evaluate the effect of cellulose nanofibers obtained from palm mesocarp fibers using the ultrafine friction grinding method after different processing times, characterized by X-ray diffractometry (XRD), microscopy, and chemical composition, as a reinforcing filler. The chemical composition and scanning electron microscopy revealed the effectiveness of the cellulose isolation process, with the analysis of the chemical composition revealing a cellulose content of 55.70% in the fibers after pulping and bleaching, in addition to changes in the visual characteristics of the material after the process aimed at isolating the cellulose. After grinding, XRD showed an increase in crystallinity (76.1% at the maximum grinding time), along with typical microscopy images of cellulose nanofibers. The analysis of the obtained nanocomposites provided insights into the role of these nanostructures in the thermo-expanded starch matrix, indicating that the nanofibers promoted changes such as an increase in mechanical properties and crystallinity, which contributed to improving overall mechanical performance. A 67.48% increase in flexural strength was achieved for the formulation with cellulose nanofibers that underwent 150 min of grinding, without causing major variations in density. © King Abdulaziz City for Science and Technology 2025.

关键词： Starch

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Energy Efficiency Project with Actions to Encourage the Rational and Sustainable Use of Electric Energy 19

Energy Efficiency Project with Actions to Encourage the Rati...

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19th IEEE International Conference on Environment and Electrical engineering and 2019 IEEE Industrial and Commercial Power Systems Europe, EEEIC/I and CPS Europe 2019

作者： Lemos, G.C. Faria, A.F. Viajante, G.P. Domingues, E.G. Domingos, J.L. Silva, S.B. Souto, O.C.N. Velloso, E.J.F. Franca, J.L. Graduate Program in Sustainable Process Technology IFG Goiânia-GO Brazil Graduate Program in Electrical and Computer Eng. UFG Goiânia-GO Brazil Graduate Program in Sustainable Process Technology IFG Itumbiara-GO Brazil Anima Projects Engineering Commerce Goiânia-GO Brazil

ISBN: (纸本)9781728106526

This work is the critical analysis of an Energy Efficiency Project (EEP) developed in an educational institution. The case-study is based on several fronts that synthesize the perspective of sustainability in a Solar Tree, an equipment to compose the landscape furniture with the capacity to generate electricity from a renewable source, symbolizing the project and acting as motivating agent in maintenance, and also contributing to the design of new actions with this bias. In the other fronts, the work includes the quantification of the level of energy efficiency of a building, besides promoting the retrofit of the lighting system and the installation of a photovoltaic generation system, all focusing on the rational use of electric energy, whose results show that the energy saved and the reduction in the peak of demand, as well as the installation of the photovoltaic plant, will bring the installation closer to the concept of energy selfsufficiency. © 2019 IEEE.

关键词： Sustainable development

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Sugarcane bagasse-derived silica/carbon composite electrode for tetracycline detection

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Materials Chemistry and Physics 2025年 343卷

作者： de Jesus, Roberta Anjos de Sá Santos, Gustavo Vicente Salazar-Banda, Giancarlo Richard Eguiluz, Katlin Ivon Barrios Laboratory of Electrochemistry and Nanotechnology Institute of Technology and Research (ITP) Sergipe Aracaju Brazil Process Engineering Graduate Program (PEP) Tiradentes University Sergipe Aracaju Brazil Department of Chemistry Federal University of Sergipe Sergipe São Cristóvão Brazil

Tetracycline (Tc), a widely employed antibiotic in medical treatments and animal husbandry, is frequently released into environmental matrices, posing significant concerns related to food safety, human health, and ecological stability. Consequently, detecting Tc at trace concentrations through methods that are cost-effective, rapid, and highly selective remains a critical and ongoing research challenge. Carbon paste sensors (CPS) are widely recognized as versatile tools for electrochemical sensing applications. A particularly promising approach for enhancing sensor performance involves incorporating cost-effective and eco-friendly agro-industrial residues, such as biosilica derived from sugarcane ash. This study proposes the modification of CPS with commercial silica gel (Si-CPS) and biosilica (BioSi-CPS) for the electrochemical detection of Tc. Experimental findings demonstrate that Tc efficiently accumulates on the surface of the modified sensors, significantly enhancing their oxidation current response. Differential pulse voltammetry (DPV) was employed to evaluate Tc detection, with BioSi-CPS exhibiting superior electrochemical performance. This enhancement is attributed to the increased electroactive surface area and improved electrochemical properties introduced by the biosilica modification. Using BioSi-CPS, Tc was reliably detected at low concentrations, exhibiting linear response ranges of 6–80 μmol L⁻¹ and 100–1000 μmol L⁻¹. The sensor demonstrated excellent stability and reproducibility, with no significant interference from common excipients such as glucose, ascorbic acid, citric acid, and mannose. The results highlight the potential of biosilica-modified CPS as an effective, sustainable, and cost-efficient, and highly selective platform for the detection of tetracycline in environmental monitoring applications. © 2025 Elsevier B.V.

关键词： And differential pulse voltammetry Biomass material Biosilica Electrochemical sensor Tetracycline

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Noble Metal-Supported CeO₂ Catalysts for Hydrogen Production via Ethanol Steam Reforming

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ChemCatChem 2025年

作者： Silva, Felipe Anchieta e Marques, Eduardo do Espírito Santo Fonseca, Fabio Coral Gurlo, Aleksander Rodrigues, Thenner Silva Nanotechnology Engineering Program Alberto Luiz Coimbra Institute for Graduate Studies and Research in Engineering COPPE Federal University of Rio de Janeiro Av. Horácio Macedo 2030 Rio de Janeiro RJ 21941–972 Brazil Instituto de Pesquisas Energéticas e Nucleares IPEN/CNEN-SP Av. Prof. Lineu Prestes 2242 São Paulo São Paulo 05508-000 Brazil Faculty III Process Sciences Institute of Materials Science and Technology Chair of Advanced Ceramic Materials Technische Universität Berlin Straße des 17. Juni 135 Berlin 10623 Germany

This study investigates the synthesis, characterization, and catalytic performance of noble metal-supported cerium oxide (M/CeO2, where M = Au, Pd, Pt, Rh, Ru) catalysts for ethanol steam reforming, a promis... 详细信息

This study investigates the synthesis, characterization, and catalytic performance of noble metal-supported cerium oxide (M/CeO₂, where M = Au, Pd, Pt, Rh, Ru) catalysts for ethanol steam reforming, a promising method for sustainable hydrogen production. A urea-assisted deposition approach was employed to deposit noble metal nanoparticles uniformly on CeO₂ without stabilizers, preserving the support's crystallinity and enhancing reducibility through strong metal-support interactions. Catalytic tests at 550 °C over 24 h revealed significant differences in activity and the products distribution based on the metal used. Rh/CeO₂ demonstrated the highest performance, achieving complete ethanol conversion and 37.75% hydrogen production, attributed to its efficient C─C and C─H bond cleavage. Pt/CeO₂ and Ru/CeO₂ also displayed high activity and stability, whereas Pd/CeO₂ and Au/CeO₂ primarily produced acetaldehyde due to preferential C─H bond scission. Post-reaction analysis confirmed minimal carbon deposition across all catalysts, with Rh/CeO₂ exhibiting the highest resistance to coke formation. These findings emphasize the importance of noble metal choice and metal-support interactions in optimizing catalyst performance. Rh, Pt, and Ru emerged as the most promising candidates for efficient hydrogen production. This study develops advanced catalysts optimized for renewable energy use for hydrogen production via ethanol steam reforming. © 2025 Wiley-VCH GmbH.

关键词： Catalytic activity and stability Cerium oxide support Ethanol steam reforming Hydrogen production Noble metal catalysts

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Input/output Linearization Control Technique for Anaerobic Digestion Reactor with Recirculation

Input/output Linearization Control Technique for Anaerobic D...

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2019 Research, Invention, and Innovation Congress, RI2C 2019

作者： Srisuddee, Sura Sriariyanun, Malinee Panjapornpon, Chanin Tawai, Atthasit Chemical and Process Engineering Program Siringhorn International Thai-German Graduate School of Engineering King Mongkut's University of Technology North Bangkok Bangkok Thailand Department of Chemical Engineering Faculty of Engineering Kasetsart University Bangkok Thailand

Anaerobic digestion (AD) process has been generally applied in factories for wastewater treatment and energy recovery. For the AD processes, the continuously stirred tank reactor (CSTR) with recirculation are typically applied in industries for methane production from wastewater treatment. Since the recycle stream affects the inlet concentration of the reactor, the control performance of traditional PI and PID controllers used to manipulate control actuators may be limited. Additionally, the process control loops related to biochemical reactions are generally employed the operational experiences without process dynamic consideration. A control system based on input/output (I/O) linearization control technique for an anaerobic digestion (AD) process was developed in this work. The control system applied the concept of the I/O linearization technique, which followed dynamic behaviors of the reactor with a two-step (acidogenesis-methanogenesis) kinetic model. The volatile fatty acid (VFA) concentration was regulated by manipulation of the dilution rate to achieve the requested trajectories. Control performances of the closed-loop system were investigated by a simulation under servo and regulatory problems. The simulation results showed that the developed control scheme successfully forced the controlled output to achieve the desired set points and handled the introduced control problems. © 2020 The Authors, published by EDP Sciences.

关键词： Wastewater treatment

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Vacuum dried membranes of poly (l-lactic acid) and bacterial cellulose for biomedical applications

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BMC Proceedings 2014年第4期8卷 1-2页

作者： Drielle Justiniano de Souza Luismar Marques Porto Ana Paula Testa Pezzin Chemical Engineering Graduate Program Federal University of Santa Catarina Florianópolis Santa Catarina 88040623 Brazil Process Engineering Graduate Program UNIVILLE Joinville Santa Catarina 89219710 Brazil

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Mechanical property determination for combined sheet and bulk metal forming process by plane strain compression test

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Materials Today: Proceedings 2018年第3期5卷 9376-9383页

作者： Nuttakorn Sae-Eaw Yingyot Aue-U-Lan Materials and Production Engineering program Department of Mechanical and Process Engineering Thailand The Sirindhorn International Thai-German Graduate School (TGGS) King Mongkut’s University of Technology North Bangkok Thailand

A new forming technique has been developed and improved to reduce the forming load, eliminate forming defects and minimize material waste. The Combined sheet and bulk metal forming process (SBMF) is developed by combining the advantages of both sheet and bulk forming processes. The workpiece is started by using a thick sheet. It will form the material by a common stamping process to preform a skeleton shape and later on the local feature is forged to get the precise dimension. To design this process, Finite Element Modeling (FEM) was applied for the process analysis to determine the flow behavior during the deformation. The flow stress is normally obtained from the conventional tests, namely, upsetting or tensile test, in which the flow behavior would be much different from the real behavior of the SBMF process. To make the simulation result more accurate, plane strain compression test (PSCT) was proposed to determine the flow stress of the material. To achieve the plane strain condition is not realistic and would be rather difficult. The spread exponent was proposed in the equation to determine the accurate effective stress which would compensate the effect of the nonplane strain condition. In this experiment, the material was SS316L with the thickness of 4.5 mm. Teflon and oils were used as lubricants to reduce friction. FEM of PSCT was conducted by using the flow stress obtained from PSCT with different friction coefficients. It was found that the load-stroke curve obtained from the Teflon lubrication condition could provide the friction coefficient closed to zero. This should be suitably used in the test for determining the flow stress in PSCT.

关键词： Plane strain compression test (PSCT) Flow stress Combined sheet and bulk metal forming process (SBMF)

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Mechanistic and theoretical investigation of acetaminophen adsorption on titanium-coated biochar: Statistical physics models and DFT insights

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Surfaces and Interfaces 2025年 69卷

作者： Ronaldo Antunes Funari Junior Ana Carolina Ferreira Piazzi Fuhr Fernando Machado Machado Marcos Leandro Silva Oliveira Luis Felipe Oliveira Silva Salah Knani Besma Graba Guilherme Luiz Dotto Research Group on Adsorptive and Catalytic Process Engineering (ENGEPAC) Federal University of Santa Maria Av. Roraima 1000-7 97105–900 Santa Maria RS Brazil Materials Science and Engineering Graduate Program Federal University of Pelotas (UFPel) 1 Gomes Carneiro St. 96010-610 Pelotas RS Brazil Universidad De La Costa Calle 58 # 55–66 080002 Barranquilla Atlántico Colombia Center for Scientific Research and Entrepreneurship Northern Border University Arar 73213 Saudi Arabia Department of Physics College of Science Northern Border University Arar Saudi Arabia

This study investigated acetaminophen removal using biochar from Pinus elliottii modified by titanium deposition under different conditions. The raw biochar was initially obtained, and then the magnetron sputtering technique was applied to deposit thin films of titanium on the biochar surface under different conditions. The effect of titanium deposition was evaluated by an integrated approach that included physicochemical characterization of the adsorbent materials, statistical physics modeling, and theoretical analysis by Density Functional Theory (DFT), allowing an in-depth understanding of the adsorption mechanism at the macroscopic and molecular levels. Models based on statistical physics indicated that the removal process occurs predominantly by physical adsorption (adsorption energy between 19.71 and 24.75 kJ mol −1 ), with the formation of double layers and variations in the adsorption energy according to the metal deposition conditions. The steric parameters ( n > 0.5) revealed changes in the adsorption geometry, and the number of molecules adsorbed per site correlated with the titanium deposition conditions. DFT analysis showed electronegative regions in the O11 and O16 atoms with Condensed Double Descriptors (CDD = –0.0637 and –0.0511), associated with forming hydrogen bonds with the biochar. The distribution of the frontier orbitals showed a HOMO-LUMO gap of 5.24 eV, indicating the high electronic stability of the molecule. The results demonstrate that titanium deposition selectively modifies the adsorptive properties of biochar, interaction energies, and adsorption geometry.

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Renewable Biodiesel Production from Oleaginous Yeast Biomass Using Industrial Wastes

Renewable Biodiesel Production from Oleaginous Yeast Biomass...

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2019 Research, Invention, and Innovation Congress, RI2C 2019

作者： Kongruang, Sasithorn Roytrakul, Sittiruk Sriariyanun, Malinee Bioprocess Engineering and Biotechnology Center Department of Biotechnology Faculty of Applied Science King Mongkut's University of Technology North Bangkok Bangkok Thailand Department of Electrical and Computer Engineering Faculty of Engineering King Mongkut' S University of Technology North Bangkok Bangkok Thailand Chemical and Process Engineering Program Sirindhorn International Thai-German Graduate School of Engineering King Mongkut's University of Technology North Bangkok Bangkok Thailand

The accumulation lipid from oleaginous microorganisms is recognized as a second generation fuel. Biooil is known to as intracellular product of oily yeast utilizing various carbon substrates and converting different quantities of lipids in the form of triacylglycerols. This second generation fuel can be used to make biodiesel via a transesterification process. This study investigated the morphological characteristics of eight strains of Thai oleaginous yeasts via microscopy and analyzed the fatty acid profiling of yeasts cultured in three carbon sources: glucose, sugar cane molasses and crude glycerol in order to estimate biodiesel properties. To approach this goal, batch fermentations were used to culture eight yeast strains, Rhodosporidium toruloides TISTR 5123, TISTR 5154, TISTR 5149, Yarrowia lipolytica TISTR 5054, TISTR 5151, TISTR 5621, Rhodotorula glutinis TISTR 5159 and Rhodotorula graminis TISTR 5124 for 96 h under 30°C at 250 rpm. Result revealed that eight yeast strains contained significant amounts of fatty acids and lipids and accumulated mainly palmitic acid (C16:0), stearic acid (C18:0), oleic acid (C 18:1) and linoleic acid (C18:2), and they are suitable for the production of biodiesel. Fatty acid productions and profiles indicated that these yeast strains can be potentially used as the triacylglycerols producers for biodiesel production. © 2020 The Authors, published by EDP Sciences.

关键词： Lipids

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Groundwater Salt-Dissolution Distribution on Salt Producing process Involved in Chemical Speciation in Sakon Nakhon Basin, Thailand

Groundwater Salt-Dissolution Distribution on Salt Producing ...

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2013 International Conference on Frontiers of Environment,Energy and Bioscience(ICFEEB 2013)

作者： SARUNYA PROMKOTRA TAWIWAN KANGSADAN Department of Geotechnology Faculty of Technology Khon Kaen University Chemical and Process Engineering Program Department of Mechanical and Process Engineering The Sirindhorn International Thai-German Graduate School of Engineering (TGGS) King Mongkut's University of Technology North Bangkok (KMUTNB)

Salinity contamination of brine to natural groundwater affecting from the local salt productions is investigated to assess the distribution of chemical speciation and behaviors related to groundwater flow in Sakon Nakhon Basin, northeast of Thailand. Hydrochemical species are applied to study the variation of chemical stability involved and the source and flow paths of groundwater transporting in salt-dissolution region. Hydraulic head relationship and chemical constituents indicate that groundwater flows from the southern highland to the west-eastern lowland. Groundwater dissolving rock salts and gypsum (or evaporites) flows downward to the lowland following the flow direction influenced by topography, where is located as the salt evaporating fields. Hydrogeological cross-section model is designed for evaluating the salt-dissolution zones depending on the range of the total dissolved solids.

关键词： Groundwater Salt-Dissolution Distribution on Salt Producing process Involved in Chemical Speciation in Sakon Nakhon Basin Thailand

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