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Investigation of a novel biocide material for biocorrosion in simulated seawater: A case study on Tinospora cordifolia extract

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Case Studies in Chemical and Environmental engineering 2024年 10卷

作者： Royani, Ahmad Hanafi, Muhammad Aigbodion, Victor Sunday Prastya, Muhammad Eka Verma, Chandrabhan Mubarak, Nabisab Mujawar Alfantazi, Akram Manaf, Azwar Research Center for Metallurgy National Research and Innovation Agency – BRIN Kawasan Puspiptek Banten Tangerang Selatan 15314 Indonesia Postgraduate Program of Materials Science Study Department of Physics Faculty of Mathematics and Natural Sciences Universitas Indonesia Depok 16424 Indonesia Research Center for Pharmaceutical Ingredients and Traditional Medicine National Research and Innovation Agency – BRIN Kawasan Puspiptek Banten Tangerang Selatan 15314 Indonesia Department of Metallurgical and Materials Engineering University of Nigeria Nsukka 410001 Nigeria Department of Chemical and Petroleum Engineering Khalifa University of Science and Technology P.O. Box 127788 Abu Dhabi United Arab Emirates Petroleum and Chemical Engineering Faculty of Engineering Universiti Teknologi Brunei Bandar Seri Begawan BE1410 Brunei Darussalam Department of Biosciences Saveetha School of Engineering Saveetha Institute of Medical and Technical Sciences Chennai India

This case report investigates the preventive effect of Tinospora cordifolia extract on biocorrosion induced by Pseudomonas aeruginosa on mild steel API 5L in the simulated seawater medium. Electrochemical techniques, spectroscopic techniques, and surface analysis were employed to investigate biocide performance and corrosion behavior. P. aeruginosa has been shown to enhance iron dissolution in seawater medium. These findings point to the role of P. aeruginosa bacteria in forming differential oxygen, which causes corrosion. Morphology results from atomic Fourier microscopy (AFM) highlight the presence of P. aeruginosa in biotic environments, where the surface is rougher than in abiotic conditions. On the other hand, adding T. cordifolia to the biotic medium resulted in a smoother and more homogeneous surface without any significant deterioration. Electrochemical findings reveal that adding 300 mg L⁻¹ of T. cordifolia extract prevents the microbiologically influenced corrosion (MIC) of steel API 5L, with an optimum effectiveness value of 74.50 % after 21 days of incubation. This protective effect is caused by forming a more compact iron oxide surface layer and the adsorption of phenolic active compounds such as Moupinamide and others on the surface of mild steel API 5L, as detected by liquid chromatography-mass/spectrometry-mass spectrometry (LCMS-MS), Fourier-transform infrared spectroscopy (FTIR) and field emission scanning electron microscopy (FE-SEM) techniques. © 2024 The Authors

关键词： Bio-corrosion Biofilm Green biocide Plant extract Pseudomonas aeruginosa Tinospora cordifolia

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Enrichment of β-carotene in palm oil through deacidification using supercritical carbon dioxide

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Case Studies in Chemical and Environmental engineering 2025年 11卷

作者： Machmudah, Siti Wahyudiono Gautama, Pramudya Riandana Bhayu Annisa, Devi Nur Rafsanjani, Rais Rahmat Watanabe, Masaru Adschiri, Tadafumi Goto, Motonobu Food Engineering Study Program Department of Chemical Engineering Institut Teknologi Sepuluh Nopember Kampus ITS Sukolilo Surabaya 60111 Indonesia Department of Chemical Engineering Institut Teknologi Sepuluh Nopember Kampus ITS Sukolilo Surabaya 60111 Indonesia of Engineering Tohoku University 6-6-10 Aoba Aramaki Aoba-ku Sendai 980-8579 Japan New Industry Creation Hatchery Center Tohoku University 6-6-10 Aoba Aramaki Aoba-ku Sendai 980-8579 Japan WPI – Advanced Institute for Materials Research Tohoku University 6-6-10 Aoba Aramaki Aoba-ku Sendai 980-8579 Japan Department of Materials Process Engineering Nagoya University Furo-cho Chikusa-ku Nagoya 464-8063 Japan Super Critical Technology Centre Co. Ltd. Mie Kuwana 511-0838 Japan

Supercritical carbon dioxide (SCCO2) is a suitable medium for separating phytochemical compounds from various materials. Here, it was employed for crude palm oil (CPO) deacidification to concentrate the β-carotene co... 详细信息

Supercritical carbon dioxide (SCCO₂) is a suitable medium for separating phytochemical compounds from various materials. Here, it was employed for crude palm oil (CPO) deacidification to concentrate the β-carotene component. In the semibatch process, SCCO₂ was introduced to CPO feed material at various operating temperatures (40−60 °C) and pressures (15−25 MPa) with a CO₂ flow rate of 3 mL min⁻¹ for 120 min. The results indicate that the extraction yield was significantly affected by varying the operating temperature and/or pressure, and the highest extraction yield was 4.59 % (40 °C, 25 MPa). Under the same operating conditions, the addition of an ethanol entrainer improved the extraction yield to 9.31 %. However, due to the β-carotene enrichment in the raffinate product, the presence of an ethanol solvent in this process introduced challenges. © 2025 The Authors

关键词： Crude palm oil Enrichment Fractionation Supercritical CO2 β-carotene

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Characteristic of beef tallow/rice husk charcoal/plaster composite phase change materials

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AIP Conference Proceedings 2023年第1期2568卷

作者： I. Made Astika I. Nyoman Suprapta Winaya I. Ketut Gede Wirawan Akhmad Herman Yuwono I. Dewa Gede Ary Subagia 1Doctoral Study Program of Engineering Science Faculty of Engineering Udayana University Kampus Sudirman Denpasar Bali 80234 Indonesia. 2Study Program of Mechanical Engineering Faculty of Engineering Udayana University Kampus Bukit Jimbaran Badung Bali 80361 Indonesia 3Department of Metallurgy and Materials Engineering Faculty of Engineering Universitas Indonesia Kampus Baru UI Depok Depok 16424 Indonesia

Composite materials are a combination of several materials to form a new material with specific properties. Chemical compatibility of the constituent materials is a factor that affects the characteristics of composite materials. Currently, composite phase change materials (PCM) are commonly applied as thermal energy storage systems. This study investigated the characteristics of beef tallow/rice husk charcoal/plaster PCM composite. The weight fraction of rice husk charcoal used was 10%. To prevent leakage of beef tallow from the composite structure, the researcher used polyvinyl acetate (PVAc) to cover the tallow/RHC composite before mixing it with plaster material. As much as 30% of the tallow/RHC/PVAc composite weight fraction is integrated into the plaster. PCM composite was made by using a direct incorporation method. The FTIR test results on the PCM composites produced showed good chemical compatibility among different components. The scanning electron microscope results showed the formation of microcapsules where the rice husk charcoal and polyvinyl acetate functions as a wrapper/capsule for beef tallow. This composite is suitable for application in building walls as thermal energy storage.

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Preparation of activated carbon derived from water hyacinth as electrode active material for li-ion supercapacitor 16th

Preparation of activated carbon derived from water hyacinth ...

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16th International Conference on Quality in Research, QiR 2019

作者： Paduraksa, Jagad Luthfi, Muhammad Verdianto, Ariono Subhan, Achmad Widayatno, Wahyu Bambang Prihandoko, Bambang Kartini, Evvy Hudaya, Chairul Department of Electrical Engineering Faculty of Engineering Universitas Indonesia Depok16424 Indonesia Energy System Engineering Study Program Faculty of Engineering Universitas Indonesia Depok16424 Indonesia Research Center for Physics Indonesian Institute of Sciences PUSPIPTEK SerpongTangerang Selatan15314 Indonesia Center for Science and Technology of Advanced Materials BATAN Kawasan Puspiptek Tangerang15314 Indonesia

ISBN: (纸本)9783035715996

Lithium-Ion Capacitor (LIC) has shown promising performance to meet the needs of high energy and power-density-energy storage system in the era of electric vehicles nowadays. The development of electrode materials and electrolytes in recent years has improvised LIC performance significantly. One of the active materials of LIC electrodes, activated carbon (AC), can be synthesized from various biomass, one of which is the water hyacinth. Its abundant availability and low utilization make the water hyacinth as a promising activated carbon source. To observe the most optimal physical properties of AC, this study also compares various activation temperatures. In this study, full cell LIC was fabricated using LTO based anode, and water hyacinth derived AC as the cathode. The LIC full cell was further characterized to see the material properties and electrochemical performance. Water hyacinth derived LIC can achieve a specific capacitance of 32.11 F/g, the specific energy of 17.83 Wh/kg, and a specific power of 160.53 W/kg. © 2020 Trans Tech Publications Ltd, Switzerland.

关键词： Activated carbon

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Air Jet Erosion study on Stir Casted Metal Matrix Composite Aluminum-SiC 1

Air Jet Erosion Study on Stir Casted Metal Matrix Composite ...

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1st International Conference on Design and Application of engineering materials 2018, IC-DAEM 2018 in conjunction with 11th Seminar Nasional Metalurgi dan Material, SENAMM 2018

作者： Longalayuk, M. Ruskandi, C. Setiamarga, B.H. Materials Engineering Study Program Faculty of Mechanical and Aerospace Engineering Institute of Technology Bandung Indonesia Foundry Technology Department Bandung Manufacturing Polytechnics Indonesia

For equipment that operates in high-speed abrasive media, erosion will be the major factor for its failure. Metal Matrix Composite (MMC) Aluminum-Silicon Carbide has been developed for improving the lifetime for such application. In this research, MMC Al-SiC has been made using Al-7075 scrap with 5%, 10%, and 15% SiC powder addition. This MMC was manufactured using stir casting technique with 1% Magnesium addition. Optical metallography has been done to know the SiC distribution homogeneity. Erosion resistance of the MMC was studied using Air Jet Erosion Test with Alumina powder as abrasives. The microstructural study showed that MMC Al-SiC has been successfully manufactured although the SiC particle distribution has not been fully homogeneous yet. Air Jet Erosion Testing revealed that the addition of 5% SiC powder was optimal in increasing its erosion resistance. The SiC addition from 10 to 15% did not improve its erosion resistance significantly. © 2019 Published under licence by IOP Publishing Ltd.

关键词： Silicon carbide

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Reshaped Weyl fermionic dispersions driven by Coulomb interactions in MoTe2

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Physical Review B 2022年第4期105卷 045143-045143页

作者： Seoung-Hun Kang Sangjun Jeon Hyun-Jung Kim Wonhee Ko Suyeon Cho Se Hwang Kang Sung Wng Kim Heejun Yang Hyo Won Kim Young-Woo Son Korea Institute for Advanced Study Seoul 02455 Korea Department of Physics Chung-Ang University Seoul 06974 Korea Peter Grünberg Institut and Institute for Advanced Simulation Forschungszentrum Jülich and JARA D-52425 Jülich Germany Samsung Advanced Institute of Technology Suwon 16678 Korea Center for Nanophase Materials Sciences Oak Ridge National Laboratory Oak Ridge Tennessee 37831 USA Department of Chemical Engineering and Materials Science Graduate Program in System Health Science and Engineering Ewha Womans University Seoul 03760 Korea Department of Energy Science Sungkyunkwan University Suwon 16419 Korea Department of Physics Korea Advanced Institute of Science and Technology Daejeon 34141 Korea

We report the direct evidence of impacts of the Coulomb interaction in a prototypical Weyl semimetal, MoTe2, that alter its bare bands in a wide range of energy and momentum. Our quasiparticle interference patterns measured using scanning tunneling microscopy are shown to match the joint density of states of quasiparticle energy bands including momentum-dependent self-energy corrections, while electronic energy bands based on the other simpler local approximations of the Coulomb interaction fail to explain neither the correct number of quasiparticle pockets nor the shape of their dispersions observed in our spectrum. With this, we predict a transition between type-I and type-II Weyl fermions with doping and resolve its disparate quantum oscillation experiments, thus highlighting the critical roles of Coulomb interactions in layered Weyl semimetals.

关键词： Electronic structure First-principles calculations Quasiparticles & collective excitations Topological materials Weyl fermions Scanning electron microscopy Scanning tunneling spectroscopy

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Mechanical properties improvement of low 0.03 wt.% C steel through intercritical annealing

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AIP Conference Proceedings 2024年第1期3003卷

作者： Toni Bambang Romijarso Miftakhur Rohmah Fatkhurozak Efendi Mabruri Eddy Sumarno Siradj Research Centre for Metallurgy – BRIN Management Building 720 Puspiptek 15314 Indonesia Departement of Metallurgical and Materials Engineering - Universitas Indonesia Kampus UI Depok 16424 Indonesia Metallurgical Engineering Study Program – Bandung Institute of Technology – Jl. Ganesha No 10 Bandung 40132 Indonesia

In this research, the improvement of mechanical properties, especially on the tensile strength and hardness, of low 0.03 wt.% C Steel through intercritical annealing process have been studied. The steel was intercritical annealed at the temperature between AC1 and AC3 to increase the strength and hardness. The temperature of AC1 and AC3 was determined around 737 and 895℃, respectively. After being austenitized (920℃) for 30 minutes and then briefly cooling to the intercritical annealing temperature for 15 minutes, the low carbon steel — contains 0.0302 wt.% C and 0.2183 wt.% Mn — was rapidly quench into the water at 30℃. The intercritical annealing temperature was varied to 750, 775, 800, 825, and 850℃. The mechanical properties of this steel were analysed and evaluated using different heat treatment temperatures. Each specimen's hardness, tensile, and microstructure tests were carried out to compare with the initial condition of low-carbon steel. The results showed that the hardness and tensile strength of the specimens increased in mechanical properties depending on the intercritical annealing temperature. After intercritical annealed, the microstructure transformed to ferrite and martensite phase. The increase in temperature increased the martensite fraction from 25.16 to 33.03%. Af, which directly improved the tensile strength. The highest strength (680 MPa for TS and 495 MPa for YS) and hardness (351.9 VHN) was obtained by the intercritical annealed at 800℃, due to the higher martensite fraction (31.35 %. Af) and the smaller grain size (7.69 µm), when compared to the sample underwent intercritical annealed at lower temperature (700℃ and 725℃).

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The effect of koh activator concentration upon the characteristics of biomass-derived water hyacinth process on lithium-ion capacitor 16th

The effect of koh activator concentration upon the character...

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16th International Conference on Quality in Research, QiR 2019

作者： Luthfi, Muhammad Paduraksa, Jagad Verdianto, Ariono Pambudi, Yoyok Dwi Setyo Priyono, Bambang Syahrial, Anne Zulfia Lee, Joong Kee Hudaya, Chairul Department of Electrical Engineering Faculty of Engineering Universitas Indonesia Depok16424 Indonesia Energy System Engineering Study Program Faculty of Engineering Universitas Indonesia Depok16424 Indonesia Department of Metallurgy and Materials Engineering Faculty of Engineering Universitas Indonesia Depok16424 Indonesia Center for Nuclear Reactor Technology and Safety BATAN Puspiptek Area SerpongTangerang Selatan15310 Indonesia Hwarang-ro 14-gil 5 Seongbuk-gu Seoul02792 Korea Republic of

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Review on cesium doping in perovskite active layer and transport layer towards high-efficiency and stability

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AIP Conference Proceedings 2024年第1期3213卷

作者： William Harrison Winnetouw Akhmad Herman Yuwono Nofrijon Sofyan Donanta Dhaneswara Widodo Wahyu Purwanto Departement of Metallurgical and Materials Engineering Faculty of Engineering Universitas Indonesia Depok West Java 16424 Indonesia Interdisciplinary Engineering Education and Research Unit Faculty of Engineering Universitas Indonesia Depok West Java 16424 Indonesia Departement of Chemical Engineering Faculty of Engineering Universitas Indonesia Depok West Java 16424 Indonesia Energy System Engineering Study Program Faculty of Engineering Universitas Indonesia Depok West Java 16424 Indonesia

Perovskite material is considered as one of next-generation solar cells that will have good potential to replace the current silicon-based solar cells. However, several disadvantages still limit the application of this materials due to the unstable phase, crystal defects during fabrication, toxic, and susceptible to cell degradation upon humidity and ultraviolet exposure. Several methods and engineering works have been made to overcome those disadvantages including doping, a technique which induces element(s) or compound(s) that could obtain better performance. One of the promising elements is cesium (Cs) that can be doped as a cation, compound or additive which would alter the interface between the electron-selective layer and the strain of perovskite structure. By having this element, the improved higher efficiency and operation stability can be significantly expected. This review article summarizes the efforts have been carried out by researchers working on Cesium doping on the perovskite solar cell towards high efficiency and operational stability. In has been found up to present that the best Cesium cation doping was able to bring up the improvement of efficiency up to 23,71%.

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Adsorption and ecotoxicology studies with aqueous solution of Cr(VI) ions using adsorbent materials derived from Inga edulis

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Chemosphere 2025年 378卷 144378页

作者： L.D.S., Lima E.P., Fernandes A., Novelli L.P.D., Costa M.D.S., Monteiro M.V.Q., dos Santos J.A., Freitas E.M., Sussuchi - SEnM Laboratory of Corrosion and Nanotechnology - LCNT Graduate Program in Chemistry Department of Chemistry Federal University of Sergipe Av. Marcelo Deda Chagas 304 Rosa Elze Sergipe São Cristóvão49107-230 Brazil Aquatic Ecosystems Study Group - GEEA Department of Environmental Engineering Federal University of Sergipe Av. Marcelo Deda Chagas 304 Rosa Elze Sergipe São Cristóvão49107-230 Brazil Laboratory of Nanotechnology and Functional Materials - LANanMF Department of Chemistry Federal University of Sergipe Av. Marcelo Deda Chagas 304 Rosa Elze Sergipe São Cristóvão49107-230 Brazil Environmental Technology Laboratory - LATAM Department of Environmental Engineering Federal University of Sergipe Av. Marcelo Deda Chagas 304 Rosa Elze Sergipe São Cristóvão49107-230 Brazil

Adsorbents derived from the bark of Inga edulis were developed for the removal of Cr(VI) ions. Chemical activation with sulfuric acid led to significant changes in the physicochemical properties of the biomass. The adsorbent materials denoted IB (inga biomass) and AIB (activated inga biomass) showed higher removal efficiencies at pH 2.0 and dosages of 1.0 and 0.25 g L−1, respectively. The adsorption kinetics could be fitted using the Elovich model, indicating that the adsorption occurred on heterogeneous surfaces. The maximum adsorption capacities were 46.0 mg g−1 for IB and 356.6 mg g−1 for AIB, with behaviors that could be described by the Langmuir (monolayer) and Freundlich (multilayer) models, respectively. XPS analyses confirmed the reduction of Cr(VI) to Cr(III), due to interactions with oxygenated functional groups. Thermodynamic evaluation indicated that the adsorption was spontaneous, with exothermic character for IB and endothermic character for AIB. Ecotoxicological assays using Daphnia similis showed that a Cr(VI) concentration of 4.34 μg L−1 caused 50.0 % immobility, while adsorption by the materials eliminated the toxicity, demonstrating the effectiveness of the adsorbents in reducing environmental impacts. Additionally, an electrode derived from the adsorption of Cr(VI) on AIB, denoted CPEAIB-Cr-ads-active, presented good performance in the hydrogen evolution reaction (HER), with high current density and low overpotential. The structure of the electrode, with high surface area and the presence of pores and cavities, was favorable for electrochemical catalysis, evidencing its potential for use in applications concerning renewable energy and environmental detoxification. © 2025 Elsevier Ltd

关键词： Environmental monitoring

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