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Corrosion inhibition of mild steel in hydrochloric acid environment using thiadiazole derivative: Weight loss, thermodynamics, adsorption and computational investigations

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South African Journal of chemical engineering 2022年 41卷 244-252页

作者： Annon, Iman A. Abbas, Ahmed S. Al-Azzawi, Waleed K. Hanoon, Mahdi M. Alamiery, Ahmed A. Isahak, Wan Nor Roslam Wan Kadhum, Abdul Amir H. Department of production engineering and metallurgy University of Technology-Iraq Baghdad Iraq Al-Farahidi University Baghdad 10001 Baghdad 10001 Iraq Department of Chemical and Process Engineering Faculty of Engineering and Built Environment University Kebangsaan Malaysia (UKM) P.O. Box: 43000 Bangi Selangor Malaysia University of Al-Ameed Karbala Iraq

The corrosion inhibition potency of 1-(2-ethylamino-1,3,4-thiadiazol-5-yl)-3-phenyl-3-oxopropan (ETO) for mild steel in 1.0 M hydrochloric acid was investigated by applying weight loss techniques, and quantum chemical calculations. Conditions that determine the potential for corrosion inhibition, including;concentration, the structure of ETO, and solution temperature, were chosen for the study. The highest inhibitive efficacy of ETO was 98.4%, at the optimum concentration (500 ppm) and room temperature. ETO has superior corrosion inhibitive potency in the HCl environment, owing to the presence of the thiadiazole and benzene rings, in addition to carbonyl and amino groups. Applicable thermodynamical equations were used to calculate the activation energy, enthalpy, and entropy. The adsorption isotherms were applied to determine the Gibbs free energy difference. The experimental findings of the investigation revealed that the activation energy of an inhibited process was higher than for an uninhibited process. Furthermore, the increased inhibition efficiency with improving temperature, and the values of ΔG^o, indicated that ETO molecules coated the mild steel surface in both chemical adsorption and physical interactions. The adsorption process on the mild steel surface obeys the Langmuir adsorption isotherm. Both experimental and density functional theory (DFT) findings in the current investigation are in excellent agreement. © 2022

关键词： chemical adsorption Corrosion inhibitor Langmuir Oxopropan Thermodynamic

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Fuzzy Logic Framework to Estimate the Amount of Sulphur Dioxide, Benzoic Acid and Sorbic Acid in Canned Food

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SSRN 2023年

作者： Mavani, Nidhi Rajesh Mohd Ali, Jarinah Hussain, M.A. Abd. Rahman, Norliza Hashim, Haslaniza Department of Chemical and Process Engineering Faculty of Engineering & Built Environment Universiti Kebangsaan Malaysia UKM Selangor Bangi43600 Malaysia Department of Chemical Engineering Faculty of Engineering University of Malaya Kuala Lumpur50603 Malaysia Department of Food Sciences Faculty of Science & Technology Universiti Kebangsaan Malaysia UKM Selangor Bangi43600 Malaysia

Canned food market demand has arisen due to the higher need for instant and ready-to-eat food to be consumed. Food preservatives are often added to those canned and processed foods to prolong their shelf life and help to sustain the quality, taste, color, and food texture. However, excessive usage of such food preservatives can lead to various diseases and health issues including palpitations, allergies, and cancer. Therefore, food preservatives detection in food samples is essential for safety consumption and health well-being. This paper proposed a fuzzy logic framework to determine the amount of sulphur dioxide, benzoic acid and sorbic acid in five different food categories as referred to the Food Acts 1983 and Food Regulations 1985 in Malaysia. The fuzzy logic model comprises of Mamdani inference system design with 90 fuzzy rules, 15 and 5 membership functions for both the input and output parameters respectively. 50 random values and 10 lab analysis results based on the industrial samples were used to validate the developed algorithms in ensuring the safety of the food products. Results obtained from the fuzzy logic model concluded that all the industrial samples are safe to be eaten and comply with the Sixth Schedule, Regulation 20 in both Acts. The framework aims to become the basis prior to developing a sensor to detect the amount of preservatives in an easy, rapid and reliable approach. © 2023, The Authors. All rights reserved.

关键词： Fuzzy inference

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The Influence of Diols and Sio2 Particles on Co2 Absorption and Nh3 Escaping During Carbon Dioxide Capture in Ammonia Solutions

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SSRN 2023年

作者： Amibo, Temesgen Abeto Konopacka-Lyskawa, Donata Gdańsk University of Technology Faculty of Chemistry Department of Process Engineering and Chemical Technology Narutowicza 11/12 Gdańsk80-233 Poland School of Chemical Engineering Jimma Institute of Technology Jimma University P.O. Box-378 Jimma Ethiopia

Ammonia solutions are widely used solvents for CO2 capture. However, a significant disadvantage of these solvents is secondary pollution of the purified gas stream by desorbed ammonia. In this work, 1,ω-diols, and colloidal silica have been proposed to reduce this undesired effect. Ammonia solutions with the addition of ethylene glycol (EG), 1,3-propanediol (PRD), 1,4-butanediol (BUD), 1,5-pentanediol (PED), or 1,6-hexanediol (HED) and ammonia solution with the addition of diol and colloidal SiO2 were tested. The concentration of CO2 and NH3 in the exhaust gas was continuously measured during the experiments. Based on the recorded measurements, the number of moles of CO2 absorbed and the number of moles of NH3 lost were calculated. Mass transfer coefficients for CO2 absorption and NH3 desorption were also determined. The studies showed that CO2 absorption occurred faster in ammonia solutions with EG, PRD, BUD, and HED, and the CO2 loading was higher than in pure NH3 solution. The most effective additive improving CO2 absorption was BUD, followed by HED. SiO2 particles improved slightly the absorption efficiency in most of the tested diol solutions. All diols used inhibited the escape of ammonia, with PED having the most effective effect. However, adding silica particles effectively inhibited ammonia escape in all tested systems. © 2023, The Authors. All rights reserved.

关键词： Ammonia

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A model for predicting the performance and maximizing the drying efficiency of an innovative fountain bed dryer

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Particuology 2025年 102卷 251-263页

作者： Sukunza, Xabier Rojcewicz, Konrad Martin, Aimar Bolaños, Maider Tellabide, Mikel Olazar, Martin Dajnowiec, Fabian Oksiuta, Zbigniew Department of Chemical Engineering University of the Basque Country UPV/EHU PO Box 644 BilbaoE48080 Spain Faculty of Mechanical Engineering Bialystok University of Technology Wiejska 45C street Bialystok15-351 Poland Department of Process Engineering Equipment and Food Biotechnology University of Warmia and Mazury Olsztyn Poland

Tumble, rotary drum, belt and fluidized bed dryers are commonly used for the drying of biomass, but their energy consumption is high due to their low heat and mass transfer rates. Thus, fountain bed dryers have been proposed in the literature, which have proven effective in the drying of coarse and fine sawdust. Furthermore, dried sawdust is burned in a furnace, and the exhaust gases are fed in the fountain bed dryer to provide heat to both drying and preheating chambers. However, the influence of operating and geometric parameters on the performance of fountain bed dryer has not been ascertained to date. Accordingly, a mathematical model has been developed in this study, which solves the unsteady state mass and energy balances for the solid, exhaust gases and air. The exhaust gases flow rate is the most influential parameter, followed by the air flow rate, whereas the cone angle is the least influential one. © 2025 Chinese Society of Particuology and Institute of process engineering, Chinese Academy of Sciences

关键词： Dynamic models

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Review of mayflies (Insecta Ephemeroptera) as a bioindicator of heavy metals and microplastics in freshwater

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Science of the Total Environment 2025年 958卷 178057页

作者： Benhadji, Nadhira Kurniawan, Setyo Budi Imron, Muhammad Fauzul Institute of Technology and Life Sciences—National Research Institute Falenty Hrabska Avenue 3 Raszyn05-090 Poland Department of Chemical and Process Engineering Faculty of Engineering and Built Environment Universiti Kebangsaan Malaysia Selangor UKM Bangi43600 Malaysia Study Program of Environmental Engineering Department of Biology Faculty of Science and Technology Universitas Airlangga Campus C UNAIR Jalan Mulyorejo Surabaya60115 Indonesia Department of Water Management Faculty of Civil Engineering and Geosciences Delft University of Technology Stevinweg 1 CN Delft2628 Netherlands

Heavy metal and microplastic pollutions are prevalent in freshwater ecosystems, with many freshwater bodies being contaminated by one or both of these pollutants. Recent studies reported extreme detections of Cd, Pb and Zn, high concentrations of Cr, Pb and Cu and microplastics acting as vectors of pollutants, including heavy metals. Mayflies can serve as bioindicators of heavy metal contamination in freshwater ecosystems because changes in their community structure, physiology, and behaviour can reflect and help predict the concentrations of metals in these environments. This review discusses the ecological alterations induced by tissue metal concentration in mayflies and other macroinvertebrates. As sensitive taxa to heavy metal contamination, mayflies can reflect the impacts of this pollution through their ethology and relationship to the substrate, highlighting issues such as eutrophication, alterations in community structure, inhibitory effects and sediment toxicity. Mayflies are also highly affected by microplastic exposure, which leads to ingestion, bioaccumulation, biomagnification, habitat and community alteration, behavioural changes, physiology alteration and toxicity. Mayflies bioindication metrics for assessing the impact of heavy metals and microplastics include the examination of community alteration, functional feeding behaviour, molecular structure, dietary and toxicity impacts, bioaccumulation and biomagnification and biomarkers. Current challenges for the utilization of mayflies as bioindicators include temporal variations in sensitivity, lack of universally recognised protocols and need for standardised protocols for microplastic analysis. Additionally, the applicability of mayflies as bioindicators may vary across different ecosystems, emphasising the need for selecting suitable indicators that align with the unique characteristics of the ecosystem. © 2024 The Authors

关键词： Macroinvertebrates

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Towards low-cost and sustainable biochar production based on empty fruit bunch: Effect of pelletization, microwave power, residence time, and mass on biochar quality for commercial approach

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Case Studies in chemical and Environmental engineering 2024年 10卷

作者： Sidabutar, Rivaldi Irvan Trisakti, Bambang Gusty, Noersukma Dwi Syahputra, Mhd. Rivaldi Saputra, Bagus Wahyu Alexander, Vikram Daimon, Hiroyuki Abdul, Peer Mohamed Department of Chemical Engineering Faculty of Engineering Universitas Sumatera Utara Indonesia Department of Applied Chemistry and Life Science Toyohashi University of Technology Toyohashi 441-8580 Japan Department of Chemical and Process Engineering Faculty of Engineering and Built Environment Universiti Kebangsaan Malaysia Selangor Darul Ehsan Bangi 43600 Malaysia

Biochar produced from biomass based Empty Fruit Bunches (EFB) pyrolysis presents an alternative energy source. Biomass through the pelletization process will produce bio-pellets with higher density, while microwave pyrolysis achieves better energy efficiency and cost effectiveness. This two-step process will produce a product with a longer combustion duration and higher thermochemical conversion efficiency. This study aims to utilize EFB waste through a two-step process (pelletization and microwave pyrolysis) to produce biochar as an alternative renewable energy approaching commercial standards. EFB bio-pellets with a mass of 80, 100, and 120 g were pyrolyzed in a microwave pyrolysis reactor with the power of 450, 600, and 850 W, and in time variations of 20, 30, and 40 min. The results showed that 850 W power and 80 g mass were the optimal conditions to produce biochar with the highest heating value (26.73 MJ/kg), moisture content (0.48 %) volatile matter content (12.56 %), ash content (22.33 %), and fixed carbon (64.62 %). The SEM-EDX analysis indicated that the biochar product showed an increase in carbon (C) content up to 67.4 %. It is expected that combination of the pelletization process and microwave assisted pyrolysis could become a new alternative for producing biochar that could be commercialized. This research was carried out to address the problem of accumulating EFB in palm oil mills and generating renewable energy from waste. © 2024 The Authors

关键词： Bio-pellets Biochar Empty fruit bunch Microwave Pyrolysis

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A review of ion adsorption clay as a high potential source of rare earth minerals in Malaysia

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Materials Today: Proceedings 2023年

作者： Sobri, N.A. Yunus, M.Y.B.M. Harun, N. Faculty of Chemical and Process Engineering Technology Universiti Malaysia Pahang Lebuh Persiaran Tun Khalil Yaakob 26300 Kuantan Pahang Malaysia Department of Chemical Faculty of Engineering Technology Universiti College TATI Jalan Panchur Teluk Kalong 24000 Chukai Terengganu Malaysia Universiti Malaysia Pahang Lebuh Persiaran Tun Khalil Yaakob 26300 Kuantan Malaysia

Rare earth elements (REEs) have emerged as a critical component in manufacturing various products for green technology. This paper aims to comprehensively review the formation of ion adsorption clay, REEs weathering profile, clay minerals' potential in adsorbing REEs, ion-exchange mechanism and method for REEs extraction, and the potential of ion adsorption clay as a REEs source in Malaysia. In conclusion, ion adsorption clay has significant potential as a REEs mineral source in Malaysia, where a higher concentration of REEs has been identified compared to China, a developing country in the REEs minerals industry of ion adsorption clay. © 2023 Elsevier Ltd. All rights reserved.

关键词： Rare earth elements

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Comprehensive review on the role of salinity on oil recovery mechanisms during chemical flooding

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Journal of Molecular Liquids 2024年 415卷

作者： Nyah, Francis Ridzuan, Norida Ikechukwu Nwaichi, Peter Umunnawuike, Chika Agi, Augustine Faculty of Chemical and Process Engineering Technology Universiti Malaysia Pahang Al-Sultan Abdullah Lebuhraya Persiaran Tun Khalil Yaakob Pahang Kuantan26300 Malaysia Universiti Malaysia Pahang Al-Sultan Abdullah Pahang Gambang26300 Malaysia

Previous studies have reported contradictory behavior on the influence of salinity on enhanced oil recovery (EOR) chemicals like surfactants, polymers, and nanoparticles among others. This uneven agreement of data and huge variation of experimental results indicates that the effect of salinity on EOR mechanisms is still tenuous in literature. This research presents the recent advances in the influence of salinity on EOR mechanisms and the applications of salinity in EOR. Therefore, the main objective of this research is to draw an informed conclusion on the debate regarding the impact of salinity on oil recovery so that geologists, reservoir, petroleum, and chemical engineers from academia and industry may have a clear standpoint on the impact of salinity on EOR mechanisms. Herein, reservoir salinity was discussed. The effect of salinity on EOR mechanisms was reviewed. Likewise, the application of salinity to oil recovery was elucidated. Finally, the challenges encountered during nanofluid, surfactant, alkaline, foam, and polymer flooding have brought light novel concepts for research which are highlighted herewith proffered technical solutions. Experimental results indicate that the optimal salinity thresholds for augmenting recovery typically fall within the range of 1000 to 6000 ppm. Therefore, it is recommended to maintain salinity below 5000 ppm in laboratory scale experiments and 3000 to 10,000 ppm in field conditions. Most literature has proposed fines migration as an EOR mechanism during low salinity water flooding (LSWF). However, there is no correlation between clay fines migration and EOR, indicating that EOR during LSWF is not caused by fines migration but rather by the injected fluid. © 2024 Elsevier B.V.

关键词： Oil well flooding

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α-Bi2(MoO4)3 nanorods decorated with two-dimensional g-C3N4 nanosheets for efficient degradation of doxycycline under visible light illumination

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process Safety and Environmental Protection 2022年 163卷 1-13页

作者： Vasanthakumar, V. Alsawalha, Murad Alomayri, Thamer Allehyani, Saud Hu, Yi-bo Fu, Ming-Lai Yuan, Baoling Xiamen Key Laboratory of Municipal and Industrial Solid Waste Utilization and Pollution Control College of Civil Engineering Huaqiao University Fujian Xiamen361021 China Department of Chemical and Process Engineering Technology Jubail Industrial College P.O. Box 10099 Jubail31961 Saudi Arabia Department of Physics Faculty of Applied Science Umm Al-Qura University PO Box 21955 Makkah Saudi Arabia

Water pollution caused by pharmaceutical and personal care products (PPCPs) has been significant stress on the water management system. The development of effective and recyclable material for PPCPs removal has become essential. In the present work, a highly efficient g-C3N4/α-Bi2(MoO4)3 nanocomposites was prepared by a simple wet impregnation method and investigated as a catalyst for the photocatalytic degradation of doxycycline under visible light irradiation. The as-prepared catalysts with various mass ratios were systematically characterized with XRD, FT-IR, UV−vis, FE-SEM, EDX, FE-TEM, and XPS. The equal weight ratio (50:50) of g-C3N4/α-Bi2(MoO4)3 nanocomposite exhibits excellent visible light absorption and outstanding doxycycline photodegradation due to the improved separation efficiency of photo-generated charge carriers. After four consecutive cycles, the equal weight ratio (50:50) of g-C3N4/α-Bi2(MoO4)3 nanocomposite shows superior photostability. The scavenger study was carried out to investigate the role of active species in photodegradation activity. More superoxide radicals present on the surface of g-C3N4/α-Bi2(MoO4)3 nanocomposites can significantly enhance the photocatalytic performance. Therefore, a simple wet impregnation method was used to produce a low-cost g-C3N4/α-Bi2(MoO4)3 photocatalyst with the influential effects of removing pharmaceutical contaminants in water bodies. © 2022 The Institution of chemical Engineers

关键词： Nanocomposites

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Mutual Inductance Estimation for Asymmetrical Coupler with Multiple Transmit Coils

Mutual Inductance Estimation for Asymmetrical Coupler with M...

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International Colloquium on Signal processing & Its Applications, CSPA

作者： Zulkifly Aziz Mohd Mawardi Saari Mohd Aufa Hadi Putera Zaini Nurul A’ In Nadzri Chin Sim Yee Faculty of Electrical and Electronics Engineering Technology Universiti Malaysia Pahang Pekan Pahang Malaysia Faculty of Chemical and Process Engineering Technology Universiti Malaysia Pahang Pekan Pahang Malaysia

The standard method in calculating the mutual inductance is by using Neumann’s formula which involves double integral and solution to elliptic integrals. This work examines the coil reactance approach when doing coil analysis by finite element method. The approach of magnetic vector potential is applied to an asymmetrical coupler with multiple transmitting coils and a miniature pickup coil. Rounded-tip ferrite cored receiver is used to improve coupling. Comparison with the experimental results showed the numerically computed values are within an acceptable range of ~5 %. The observed pairing effect between multiple transmit coils is confirmed with the experimental result which further validates this approach. The method discussed herein can be applied to design a wireless coupler to power multiple light emitters in a cylindrical photoreactor.

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