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Influence of dope composition of polyethersulfone membrane blend with cellulose nanocrystal and carboxylated multi-walled carbon nanotube on humic acid rejection

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Materials Today: Proceedings 2024年 107卷 53-58页

作者： Nor Azura C. Mahmud Mazrul Nizam Abu Seman Mohd Sobri Takriff Wei Lun Ang Syed M. Saufi Faculty of Chemical and Process Engineering Technology Universiti Malaysia Pahang Lebuhraya Persiaran Tun Khalil Yaakob 26300 Gambang Kuantan Pahang Malaysia Chemical and Water Desalination Engineering Program College of Engineering University of Sharjah United Arab Emirates Department of Chemical & Process Engineering Faculty of Engineering & Built Environment Universiti Kebangsaan Malaysia 43600 Bangi Selangor Malaysia

A full factorial experimental design was employed to investigate the dope composition of a membrane made of cellulose nanocrystal (CNC), multi-walled carbon nanotube (MWCNT), and polyethersulfone (PES) for its ability to reject humic acid (HA). Four factors were screened, including PES composition, polyvinylpyrrolidone content, CNC content, and carboxylated MWCNT content. The membranes were tested for HA rejection using a 10-ppm aqueous feed solution. The results indicated that the percentage of MWCNT had the most significant impact, contributing 72.31% to the overall contribution. The fabricated membranes exhibited high HA removal capacity of up to 90% for the membrane embedded with MWCNT. The model's predicted values agreed reasonably with the experimental data, indicating the model's validity. This study provides insights into the development of CNC/MWCNT/PES membranes for efficient HA rejection in water treatment applications.

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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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Measurement and modeling of bubble and dew points of the carbon dioxide + tetrahydrofuran + water system

Measurement and modeling of bubble and dew points of the car...

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作者： Sabil, Khalik M. Witkamp, Geert-Jan Peters, Cor J. Process Equipment Mechanical Maritime and Materials Engineering Delft University of Technology Leeghwaterstraat 44 2628 CA Delft Netherlands Chemical Engineering Programme Universiti Teknologi PETRONAS Bandar Seri Iskandar 31750 Tronoh Perak Malaysia Chemical Engineering Program Bu Hasa Building Petroleum Institute P.O. Box 2203 Abu Dhabi United Arab Emirates

The bubble-and dew-point behavior of the carbon dioxide (1) + tetrahydrofuran (2) + water (3) system has been studied. Pressure-temperature isopleths were measured for the ternary system at x1) 0.01,0.02,0.03,0.04,0.09, and 0.27 at a constant mole fraction of tetrahydrofuran, x2) 0.05. The bubble-and dewpoint lines for the ternary systems were also measured at x2) 0.01,0.03,0.05, and 0.07 for fixed composition of carbon dioxide (x1) at 0.04 mol fraction and at x2) 0.01,0.03,0.05,0.06, and 0.09 for a fixed composition of carbon dioxide (x1) at 0.09, respectively. The pressure and temperature range from (1 to 6) MPa and (280 to 300) K, respectively. The experimental results for the ternary system have been modeled using the predictive Peng-Robinson-Stryjek-Vera (PRSV) equation of state with the Huron-Vidal-Orbey-Sandler (HVOS) mixing rule and the universal quasi-chemical activity coefficient (UNIQUAC) GEmodel. Excellent agreements have been found between the experimental and the predicted values of the bubble and dew points of the ternary system throughout the composition range studied. © 2010 American chemical Society.

关键词： Ternary systems

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CREATIVE WAYS OF REVAMPING NH3 PLANTS CAN IMPROVE PROFITABILITY.

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Plant/operations progress 1984年第2期3卷 101-107页

作者： Wang, Shoou-I Patel, Nitin M. Air Products and Chemicals Inc. Allentown Pa. 18105 Shoou-I Wang:is Manager of Hydrogen and Syngas Section Process Engineering Air Products & Chemicals Inc. Allentown Pa. He is responsible for high temperature process design activities on hydrogen carbon monoxide ammonia and methanol plants. He is also program manager for research and development in the hydrogen and carbon monoxide areas. He received a BS from Chung-Yuan University and an MS and PhD from Montana State University all in chemical engineering. Nitin M. Patel:is principal process engineer with Air Products & Chemicals Inc. Allentown Pa. He is responsible for high temperature process design/optimization activities regarding hydrogen carbon monoxide and ammonia plants. He received his BS from University of Baroda and his MS from Georgia Institute of Technology (Georgia Tech) both in chemical engineering.

High energy costs have created a need to revamp existing ammonia plants to reduce the overall energy consumption per unit ton of production. This paper discusses the Air Products and chemicals, Inc. (APCI) NH//3 plant bottlenecks and shares some successful experience in revamping to overcome bottlenecks associated with capacity expansion, and overall performance efficiency/reliability improvements.

关键词： AMMONIA

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Exploring the feasibility of nanocomposites from solid waste materials for acid mine drainage remediation: A comprehensive scientific review

Total Environment Engineering

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Total Environment engineering 2025年 2卷

作者： Yudha Gusti Wibowo Hana Safitri Dedy Anwar Arif Rohman Anis Tatik Maryani Sudibyo Sudibyo Setyo Budi Kurniawan Ahmad Tawfiequrahman Yuliansyah Himawan Tri Bayu Murti Petrus Department of Mining Engineering Institut Teknologi Sumatera Jalan Terusan Ryacudu Way Hui Kecamatan Jati Agung Lampung Selatan 35365 Indonesia Center for Green and Sustainable Materials Institut Teknologi Sumatera Jalan Terusan Ryacudu Way Hui Kecamatan Jati Agung Lampung Selatan 35365 Indonesia Department of Chemical Engineering Universitas Gadjah Mada Daerah Istimewa Yogyakarta 55284 Indonesia Department of Geomatic Engineering Institut Teknologi Sumatera Jalan Terusan Ryacudu Way Hui Kecamatan Jati Agung Lampung Selatan 35365 Indonesia Agroecotechnology Study Program Faculty of Agriculture Universitas Jambi Jambi Indonesia Research Center for Mining Technology Badan Riset Inovasi Nasional Tanjung Bintang Lampung Indonesia Department of Chemical and Process Engineering Faculty of Engineering and Built Environment Universiti Kebangsaan Malaysia 43600 UKM Bangi Selangor Malaysias

Acid Mine Drainage (AMD) poses significant environmental challenges to water resource management. This review explores the potential of waste materials in developing nanocomposites for AMD treatment. The study highlights the benefits of using agricultural residues, industrial byproducts, and municipal solid waste as components in nanocomposites. These waste-based nanocomposites offer cost-effectiveness, resource conservation, and transformation of waste into valuable assets. The mechanisms of pollutant removal, recent trends, and advancements in nanocomposites for AMD treatment are discussed. Unlike previous studies, this work provides a pioneering comprehensive assessment of waste-derived nanocomposites, systematically synthesizing state-of-the-art advancements while critically evaluating their practical application and ecological impact. Recommendations for optimizing nanocomposites include material selection, property tailoring, and field implementation. Future research directions are proposed, such as advanced characterization techniques, novel waste material exploration, and ecological impact evaluation. Harnessing waste material potential can promote sustainable water and waste management, restoring AMD-affected environments and protecting water resources.

关键词： Acid mine drainage Adsorption Nanocomposites Water pollution Wastewater treatment

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Adsorption kinetics, isotherms and desorption studies of mercury from aqueous solution at different temperatures on magnetic sodium alginate-thiourea microbeads

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Environmental Nanotechnology, Monitoring and Management 2019年 12卷

作者： Patiño-Ruiz, D. Bonfante, H. De Ávila, G. Herrera, Adriana Doctorate in Engineering Program Nanomaterials and Computer Aided Process Engineering Research Group Universidad de Cartagena Cartagena Colombia Chemical Engineering Program Process Design and Biomass Use Group Universidad de Cartagena Cartagena Colombia Chemical Engineering Program Nanomaterials and Computer Aided Process Engineering Research Group Universidad de Cartagena Cartagena Colombia

Magnetite (Fe3O4) nanoparticles and thiourea were employed to modify sodium alginate microbeads for adsorption of Hg ions from aqueous solution. The Fe3O4 nanoparticles were initially synthesized by co-precipitation m... 详细信息

Magnetite (Fe₃O₄) nanoparticles and thiourea were employed to modify sodium alginate microbeads for adsorption of Hg ions from aqueous solution. The Fe₃O₄ nanoparticles were initially synthesized by co-precipitation method. Fourier infrared spectroscopy (FTIR) determined the presence of hydroxyl, carboxyl, thiol and amine functional groups in the microbead molecular structure. According to BET and BJH methods, the MAT microbeads had surface area, pore diameter and volume of 7.3472 m²/g, 12.9058 nm and 0.0255 cm³/g, respectively. Scanning electron microscopy (SEM) equipped with an EDX system allowed to obtain morphological information of the MAT microbeads, in which was observed the main elements introduced by the presence of thiol groups and iron ions. The result of saturation magnetization (M_s) performed by a vibrating sample magnetometer (VSM), is common for superparamagnetic materials, which slightly decreased due to the low amount of magnetic nanoparticles in the microbead structure. Adsorption kinetics showed that highest rate was about 98% in the first 20 min, and then decreased to zero. Pseudo-first order was the model that better fitted to experimental data with a value about 2.6 mg/g. Meanwhile, adsorption isotherm was better described using Langmuir model, suggesting that the Hg ions adsorption was mainly given by electrostatic interaction and chemical bonding among the functional groups, as well as the formation of a saturated layer onto the microbead surface occupying all the available sites. © 2019

关键词： Adsorption Magnetic nanoparticles Mercury Sodium alginate microbeads Thiourea

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Sedimentary Facies, Depositional Environment and Reservoir Quality of Group-B Shallow Clastic Reservoir in the Malay Basin, Malaysia

Sedimentary Facies, Depositional Environment and Reservoir Q...

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2023 SPE Nigeria Annual International Conference and Exhibition, NAIC 2023

作者： Bashiron, N. Johari, S. Sidek, A. Agi, A. Ariffin, M.H. Supee, A. Ridzuan, N. Aini Mahat, S.Q. Department of Petroleum Engineering Faculty of Chemical and Energy Engineering Universiti Teknologi Malaysia Johor Johor Bahru Malaysia PETRONAS Carigali Sdn. Bhd. PETRONAS Twin.Tower Kuala Lumpur Malaysia Faculty of Chemical and Process Engineering Technology College of Engineering Technology Universiti Malaysia Pahang Gambang Pahang Malaysia Geology Program Faculty of Science & Technology Universiti Kebangsaan Malaysia Bangi Selangor Malaysia

ISBN: (纸本)9781959025177

Shallow reservoirs in Group-B of MS-field in Malay Basin, Terengganu's offshore, Malaysia were explored for development. Poor understanding of depositional settings, stratigraphic context, lithofacies, reservoir geometry, reservoir quality, and heterogeneity are some of the difficulties encountered in developing these shallow reservoirs. In this study, these challenges were circumvented by performing reservoir architecture and quality analysis. This was achieved by integrating the interpretation from the cores, well logs, petrographic and petrophysical analyses for depositional model generation, lithofacies description, as well as reservoir geometry, continuity, and quality determination. Five lithofacies were identified in Group- B, namely: laminated mudstone (ML), bioturbated mudstone (MB), heterolithic mud dominated (MH), heterolithic sand dominated (SH), and bioturbated sandstone (SB). The sediments encountered in ML and SB lithofacies consist of moderate to good reservoir quality, while for SH and MH, they ranged from high to low quality. This study provides a better insight to the shallow reservoir heterogeneity in MS-field and the results obtained could also be applied to the other similar shallow reservoirs for characterization and modelling improvement processes. Copyright © 2023 Society of Petroleum Engineers.

关键词： Stratigraphy

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PERCHL0R0ETHYLENE EXTRACTION DESULFURIZATION OF WEATHERED COALS

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Liquid Fuels Technology 1993年第3-4期11卷 507-527页

作者： Padmakar Vishnubhatt[a] Sunggyu Lee - To whom all correspondence should be directed.[b] Conrad J. Kulik[b] [a] Process Research Center Department of Chemical Engineering The University of Akron Akron OH [b] Fuel Science Program Electric Power Research Institute Palo Alto CA

The perchloroethylene extraction process has proven to be an effective pre- combustion coal desulfurization process which offers a complete process package including wet grinding, organic sulfur removal, pyrite and mineral matter separation, solvent recovery, and byproducts and sulfur recovery. In this paper, coal weatherability was investigated for various Midwestern and Eastern U.S. coals, and its effect on organosulfur extractability by the perchloroethylene process was identified. Both “natural” and “artificial” weathering of these coals were experimentally investigated. A statistically significant difference in the extraction efficiency between fresh and weathered coals vas observed. A strong relation between the extractability and degree of weathering of the coal was established. The results provide a valuable insight into the process engineering of this process.

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Bioethanol from fresh and dried banana plant pseudostem

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chemical engineering Transactions 2014年 38卷 271-276页

作者： Souza, Elias L. Liebl, Gean F. Marangoni, Cintia Sellin, Noeli Montagnoli, Millena S. Souza, Ozair Department of Chemical Engineering University of the Region of Joinville - Univille Joinville SC Brazil Master's Program in Process Engineering University of the Region of Joinville - Univille Joinville SC Brazil

Lignocellulosic wastes have stood out in the study and development of processes aimed at producing biofuels. Brazil is one of the world's largest food producers and ranks fifth in world production of bananas with an average production of seven million tons per year. For each ton of bananas harvested, around four tons of lignocellulosic wastes are generated, among which 75% consists of banana plant pseudostem. This work investigated the production of bioethanol by Saccharomyces cerevisae using this residue (pseudosteam) as a fermentation substrate previously hydrolyzed under the following conditions: (a) 250 g/L of fresh biomass (equivalent to 11.75 g/L of dry matter) cut into about 1 mm long pieces and (b) 70 g/L of dry and milled biomass (drying in 60 °C forced air draft tray dryer and milling in Solab knife mill until particles of size smaller than 30 mesh). The biomass pre-treatments with H2SO 4 2% m/m and NaOH 3% m/m, both conducted at 120 °C, 15 min were evaluated. For saccharification of the pre-treated biomass, enzymatic hydrolysis (24 h, pH 5.5, 45 °C) using Novozymes® enzymatic complex composed of cellulase, beta-glucosidase and xylanase was used. The experiments were conducted in Erlenmeyer flasks containing 100 mL of work volume. The greatest percent yield in glucose (YRS = 79.5±4.4 %), calculated based on the theoretical yield of cellulose hydrolysis to glucose (1.1 g/g), was obtained with fresh biomass pre-treated with NaOH. This value was 84% higher than the percent yield resulting from the pretreatment of 70 g/L of dry biomass with the same type of hydrolysis catalyst (YRS = 43.2±1.2 %) and 31% higher than the value reached in the pretreatment of this same biomass with H2SO4 (YRS = 60.7±6.7%). The maximum RS value in hydrolyzed liquor (without prior concentration by evaporation) was obtained from dry biomass saccharification with H2SO4 (26.6±1.1 g/L). The fermentation of this liquor, after concentrating to RS ≤ 62.1 g/L, resulted in an ethanol product

关键词： Biomass

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Influence of compatibilizer and carbon nanotubes on mechanical, electrical, and barrier properties of PTT/ABS blends

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Advanced Industrial and engineering Polymer Research 2019年第3期2卷 121-125页

作者： Braga, Natália F. LaChance, Anna Marie Liu, Bin Sun, Luyi Passador, Fabio R. Technology Laboratory of Polymers and Biopolymers Federal University of São Paulo São José dos CamposSP12231-280 Brazil Polymer Program Institute of Materials Science University of Connecticut StorrsCT06269 United States Department of Chemical and Biomolecular Engineering University of Connecticut StorrsCT06269 United States Beijing Key Laboratory of Electrochemical Process and Technology for Materials College of Materials Science and Engineering Beijing University of Chemical Technology Beijing100029 China Department of Biomedical Engineering University of Connecticut StorrsCT06269 United States

Composites based on poly (trimethylene terephthalate) (PTT)/acrylonitrile butadiene styrene (ABS) blend with maleic anhydride grafted PTT (PTT-g-MA) as a compatibilizer and carbon nanotubes (CNTs) as reinforcers were prepared via melt-mixing, and the mechanical, electrical, and barrier properties of the as-fabricated composites were evaluated. Scanning electron microscopy (SEM) characterization of the cross-section of the composites after tensile test showed improved phase stability in the presence of the compatibilizer PTT-g-MA. The toughness of the composites was also improved with the addition of the compatibilizer and CNTs. Electrical conductivity tests were carried out and the results showed that CNT-reinforced composite exhibited significantly increased conductivity. Since barrier properties are very sensitive to structural changes, the oxygen transmission rate (OTR) of the composites was measured and the results showed that the composites possess a much high oxygen barrier compared to that of the neat PTT or ABS. © 2019 Kingfa SCI. & TECH. CO., LTD.

关键词： Carbon nanotubes

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