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NH_(4)Cl-assisted preparation of single Ni sites anchored carbon nanosheet catalysts for highly efficient carbon dioxide electroreduction

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Journal of Materials Science & technology 2023年第11期142卷 1-9页

作者： Dan Ping Feng Yi Guiwei Zhang Shide Wu Shaoming Fang Kailong Hu Ben Bin Xu Junna Ren Zhanhu Guo Henan Provincial Key Laboratory of Surface&Interface Science Henan Engineering Research Center of Chemical Engineering Separation Process IntensificationSchool of Material and Chemical EngineeringZhengzhou University of Light IndustryZhengzhou 450002China School of Materials Science and Engineering Harbin Institute of TechnologyShenzhen 518055China Mechanical and Construction Engineering Faculty of Engineering and EnvironmentNorthumbria UniversityNewcastle upon Tyne NE18STUK College of Materials Science and Engineering Taiyuan University of Science and TechnologyTaiyuan 030024China Department of Chemical&Biomolecular Engineering Integrated Composites Lab(ICL)University of TennesseeKnoxvilleTN 37996USA

Single-atomic transition metal-nitrogen codoped carbon(M-N-C)are efficient substitute catalysts for noble metals to catalyze the electrochemical CO_(2) reduction reaction(CO_(2)RR).However,the uncontrolled aggregations of metal and serious loss of nitrogen species constituting the M-N_(x) active sites are frequently observed in the commonly used pyrolysis ***,single-atomic nickel(Ni)-based sheet-like electrocatalysts with abundant Ni-N_(4) active sites were created by using a novel ammonium chloride(NH_(4)Cl)-assited pyrolysis *** aberration correction electron microscopy and X-ray absorption fine structure analysis clearly revealed that Ni species are atomically dispersed and anchored by N in Ni-N_(4) *** addition of NH_(4)Cl optimized the mesopore size to 7-10 nm and increased the concentrations of pyridinic N(3.54 wt%)and Ni-N_(4)(3.33 wt%)*** synergistic catalytic effect derived from Ni-N_(4) active sites and pyridinic N species achieved an outstanding CO_(2) RR performance,presenting a high CO Faradaic efficiency(FE_(CO))up to 98% and a large CO partial current density of 8.5 mA cm^(-2) at a low potential of-0.62 V ***,the FE_(CO) maintains above 80% within a large potential range from -0.43 to -0.73 V *** work provides a practical and feasible approach to building highly active single-atomic catalysts for CO_(2) conversion systems.

关键词： CO_(2)reduction Electrocatalyst Single-atomic ni NH_(4)Cl Pyridinic N

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Evaluation of antioxidant and anti-tyrosinase activities of surfactant and alcohol extracted Combretum Indicum leaves 6

Evaluation of antioxidant and anti-tyrosinase activities of ...

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6th National Conference on Postgraduate Research, NCON-PGR 2022

作者： Thanaseelan, Tanesha Nurul Hidayu, D. Sahirah, Nurul Rajaletchumy, V.K. Faculty of Chemical and Process Engineering Technology Universiti Malaysia Pahang Kuantan Pahang26300 Malaysia

Combretum Indicum (CI), which contains numerous bioactive compounds, has been used in traditional medicine for a variety of reasons, including the treatment of skin conditions. This study investigates the antioxidant and anti-tyrosinase activities of CI leaves extracted using different surfactants (Triton X-100 and Vitamin E TPGS) at concentrations of 1%, 2%, and 3%, as well as various alcohol solvents (acetone, methanol, and ethanol) at concentrations of 50%, 70%, and 90%. The antioxidant activity of the extracts has been evaluated using Total Phenolic Content (TPC) and 2,2-diphenyl-1-picrylhydrazyl (DPPH), while the anti-tyrosinase activity was assessed through a mushroom tyrosinase inhibition assay. Prior to analysis, CI leaves had been macerated, extracted, and freeze-dried. The research established that ethanol at a concentration of 50% is the optimum solvent to extract CI leaves, as it demonstrated good antioxidant and anti-tyrosinase action with a high percentage of yield and total phenolic content. As a result, the outcomes of this study contribute to a better understanding of the potential applications of CI leaf extract in cosmetics, notably in the treatment of oxidative stress and hyperpigmentation. Further study and development in this field could lead to the creation of effective and natural cosmetic products produced from CI leaves that have antioxidant and anti-tyrosinase effects. © 2022 Elsevier Ltd. All rights reserved.

关键词： Medicinal chemistry

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Analysis of volatile composition released from torrefaction of empty fruit bunch

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Materials Today: Proceedings 2022年 57卷 1202-1207页

作者： Abdul Samad, Noor Asma Fazli Saleh, Suriyati Chemical Engineering Department College of Engineering Universiti Malaysia Pahang Lebuhraya Tun Razak Gambang Pahang26300 Malaysia Faculty of Chemical & Process Engineering Technology Universiti Malaysia Pahang Lebuhraya Tun Razak Gambang Pahang26300 Malaysia

This paper presents the effect of torrefaction on constituents of empty fruit bunch (EFB) and volatile components analysis. Different torrefaction temperature ranging from 240 to 300 ℃ are employed where hemicellulose has been decomposed significantly. Cellulose and lignin show only slight degradation at investigated temperature. Volatile released from torrefaction of EFB has been collected and analyzed where only carbon monoxide and carbon dioxide non-condensable volatile components are detected. The two highest volatile fractions detected for condensable components are water and acetic acid. The formation of non-condensable and condensable volatile components are originated from dehydration and decarboxylation mechanisms during decomposition of hemicellulose. © 2021

关键词： Cellulose

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Sustainable bioethanol production by solid-state fermentation: a systematic review

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Environmental Science and Pollution Research 2025年第22期32卷 13140-13158页

作者： Ruslan, Nur Fathin Ahmad, Noormazlinah Abas, Azlan Sanfilippo, Antonio Mahmoud, Khaled Munaim, Mimi Sakinah Abdul Nour, Abdurahman Hamid Faculty of Chemical and Process Engineering Technology Universiti Malaysia Pahang Al-Sultan Abdullah Lebuhraya Tun Razak Pahang Kuantan26300 Malaysia Faculty of Social Sciences and Humanities Universiti Kebangsaan Malaysia UKM Selangor Bangi43600 Malaysia Qatar Environment and Energy Research Institute Hamad Bin Khalifa University–Qatar Foundation Doha Qatar

The escalation of the global population has accelerated the demand for sustainable energy sources such as bioethanol. Traditionally, bioethanol was obtained by the fermentation of sugar from agricultural crops and grains. However, this technique creates serious threats on the global food supplies, thus hindering the commercial production of bioethanol. Therefore, there is a need to develop new technologies and low-cost raw materials in order to ensure that bioethanol is economically comparable to the first generation of bioethanol. Solid-state fermentation (SSF) has been in the limelight within the scientific community because of its efficiency, cost-effectiveness, and promising technology to produce bioethanol. SSF involves the cultivation of microorganisms on a solid substrate in the absence of free-flowing water, which eliminates the need for sugar extraction and reduces wastewater production. This systematic review provides an overview of the applications of SSF in bioethanol production while presenting recent studies and advancements of this technology for producing sustainable and cost-effective bioethanol. © The Author(s), under exclusive licence to Springer-Verlag GmbH Germany, part of Springer Nature 2024.

关键词： Yeast

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Biomordant assisted natural dyeing of cellulosic fibre: a greener approach

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Materials Research Innovations 2025年第1期29卷 27-34页

作者： Chowdhury, Tanvir Ahmed Khandaker, Jahirul Islam Gafur, Mohammad Abdul Repon, Md. Reazuddin Islam, Md. Kamrul Hossain, Alamgir Mollick, Swaraz Department of Physics Jahangirnagar University Dhaka Bangladesh Department of Textile Engineering Daffodil International University Dhaka Bangladesh Pilot Plant & Process Development Centre Bangladesh Council of Scientific and Industrial Research Dhaka Bangladesh Department of Bioproducts and Biosystems School of Chemical Engineering Aalto University Espoo Finland Department of Production Engineering Faculty of Mechanical Engineering and Design Kaunas University of Technology Kaunas Lithuania Department of Textile Engineering Jashore University of Science and Technology Jashore Bangladesh

Natural dyes serve as a benign alternative to their synthetic counterparts, offering a sustainable option that directly mitigates the release of toxic chemicals. In this study, cotton fabrics were dyed with neem leaf extract in acidic, neutral and alkaline condition where samples were mordanted with lemon juice. The findings revealed a direct correlation between colour strength (K/S) and pH levels, and optimal fastness properties were achieved under alkaline pH conditions when a mordant was employed. The Energy Dispersive X-ray (EDX) ensured the elemental composition of lemon juice assisted dyed fabric which indicates the effective binding of cotton fabric with neem leaves extracted dye. The Fourier Transform Infrared (FTIR) Spectroscopy analysis also confirmed the interaction of cotton fabric with dye particles. The results indicate that cotton fabric can be successfully dyed with neem leaf extract and lemon juice as the biomordant, presenting an eco-friendly and sustainable approach to dyeing practices. © 2024 Informa UK Limited, trading as Taylor & Francis Group.

关键词： Cotton fabrics

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Kinetic parameter estimation for pyrolysis of empty fruit bunch using model-fitting and model-free methods

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Materials Today: Proceedings 2022年 57卷 1241-1247页

作者： Sidek, Farah Nadiah Saleh, Suriyati Abdul Samad, Noor Asma Fazli Chemical Engineering Department College of Engineering Universiti Malaysia Pahang Lebuhraya Tun Razak Pahang Gambang26300 Malaysia Faculty of Chemical & Process Engineering Technology Universiti Malaysia Pahang Lebuhraya Tun Razak Pahang Gambang26300 Malaysia

This study aimed to evaluate and compare kinetic parameters pertaining to empty fruit bunch (EFB) by using model-free and model-fitting methods. The decomposition rate of EFB was examined using data from thermogravimetric analysis (TGA). Coats-Redfern, a model-fitting method, was used in this study, while the Friedman and Flynn-Wall-Ozawa (FWO) are the model-free methods. Both methods predicted the activation energy, E, and pre-exponential factor, A as kinetic parameters at 10, 20, and 50 K min−1. Results showed that the Coats-Redfern's regression coefficient (R2) was 0.9911, with E and A of 76.53 kJ mol−1 and 16269.44 min−1, respectively. For the Friedman method, the highest R2 was 0.9987, with a conversion factor of 0.6, E = 230.22 kJ mol−1, and A = 7.53 × 1019 min−1. Meanwhile, the R2 for the FWO was 0.9988 when the conversion factor was 0.7 (E = 473.37 kJ mol−1, A = 2.60 × 1019 min−1). To conclude, this study demonstrated that the Friedman and FWO methods are more relevant in representing the pyrolysis process. © 2021

关键词： Kinetic parameters

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The effects of additives on anti-wear properties of lubricating grease formulated from waste engine oil

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Egyptian Journal of Petroleum 2022年第3期31卷 71-76页

作者： Rahman, Nurul Waheeda binti Abdu Aziz, Mohd Aizudin bin Abd Faculty of Chemical & Process Engineering Technology Universiti Malaysia Pahang Lebuhraya Tun Razak Pahang Gambang 26300 Malaysia

The goal of this study was to study the anti-wear properties of grease formulated from waste engine oil (WEO) when additives are added. There were two types of grease formulated namely sodium and fumed silica (FS) greases. The greases were formulated using a weight percentage ratio with and without the addition of additives before the attributes of consistency, FTIR (Fourier transform infrared spectroscopy), and anti-wear analysis were conducted. Results showed that the addition of additives did not affect the properties of the formulated grease except for that of sodium grease as demonstrated by the FTIR result. Sodium grease produced a spectrum with a peak in the region < 600 cm⁻¹ when analyzed using FTIR. The corrosiveness of the grease toward the copper strip was also low, as determined by class 1 corrosiveness. The addition of additives resulted in no improvement in the anti-wear properties of the grease as the coefficient of friction (COF) was low for the grease without additives than for the grease with additives. However, the addition of additives can reduce the wear scar diameter of the greases. Based on the findings of this investigation, it was found that the addition of additives did not alter the properties of the greases or improve the anti-wear properties of the greases except for the wear scar diameter. © 2022 Egyptian Petroleum Research Institute

关键词： Anti-wear Grease Waste engine oil

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The potentials of emulsified modified bitumen (EMB) for coating and insulation: An overview

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Materials Today: Proceedings 2022年 57卷 1288-1295页

作者： Ishag Obi, Nasreldeen Najib Razali, Mohd Hamid Nour, Abdurahman Faculty of Chemical and Process Engineering Technology Universiti Malaysia Pahang Lebuhraya Tun Razak 26300 Pahang Gambang Malaysia Department of Chemical Engineering Universiti Malaysia Pahang Lebuhraya Tun Razak 26300 Pahang Gambang Malaysia

Fungi mould and bacterial growth in the inner wall of buildings and operation theatres is a serious problem in the health sector. Too much moisture and dirt stimulate the growth of microorganisms. Therefore, the use of bitumen or emulsified modified bitumen product because of its adhesive properties and effective performance in coating and insulation is a promising technique to tackle this problem. However, the vast majority of bitumen and its modified products are mainly used in road paving, roofing application, and roads construction applications. Thus, the EMB product for the purpose of coating, soundproofing, and insulation needs to be properly addressed. Results obtained from this critical review have revealed the ability of EMB in insulation and coatings, as EMB paints showed a better performance than non-modified bitumen emulsion in terms of coating adhesion, aging, and heat insulation. Since the modified emulsions from waste substances is comparable to neat bitumen emulsions, the developed EMB from industrial waste will address natural resource dependency as well as the enormous environmental problem emerging from the overuse of natural resources. Further works nevertheless are needed to gain a better understanding of the mechanisms of EMB formulation in order to promote optimum industrial application. © 2021

关键词： Insulation

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Conserving elastic turbulence numerically using artificial diffusivity

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Physical Review E 2022年第1期106卷 L013101-L013101页

作者： V. Dzanic C. S. From E. Sauret School of Mechanical Medical and Process Engineering Faculty of Engineering Queensland University of Technology QLD 4001 Australia Department of Chemical Engineering University of Manchester Manchester M13 9PL United Kingdom

To simulate elastic turbulence, where viscoelasticity dominates, numerical solvers introduce an artificial stress diffusivity term to handle the steep polymer stress gradients that ensue. This has recently been shown [A. Gupta and D. Vincenzi, J. Fluid Mech. 870, 405 (2019); V. Dzanic et al., J. Fluid Mech. 937, A31 (2022)] to introduce unphysical artifacts with a detrimental impact on simulations. In this Letter, we propose that artificial diffusion is limited to regions where stress gradients are steep instead of seeking the zero-diffusivity limit. Through the cellular forcing and four-roll mill problem, we demonstrate that this modified artificial diffusivity is devoid of unphysical artifacts, allowing all features of elastic turbulence to be retained. Results are found to conform with direct simulations, reducing the impact of artificial diffusivity from a qualitative scale to a quantitative scale while only requiring a fraction of the numerical resolution.

关键词： Flow instability Non-Newtonian fluids Viscoelasticity Computational complexity Navier-Stokes equation

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Discrete-time Formation Control With Attitude Alignment: A Geometric Approach under Ergodic Products

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IEEE Transactions on Control of Network Systems 2025年第2期12卷 1793-1804页

作者： Li, Zhen Tang, Yang Zhang, Wenbing Fan, Yongqing Huang, Tingwen Xi-an University of Posts and Telecommunications School of Automation Xian710121 China East China University of Science and Technology Key Laboratory of Smart Manufacturing in Energy Chemical Process Shanghai200237 China Yangzhou University Department of Mathematics Jiangsu225002 China Shenzhen University of Advanced Technology Faculty of Computer Science and Control Engineering Shenzhen518055 China

Assuming agents possess sensing capabilities and dynamics relative to their body coordinate frames, this paper addresses a displacement-based strategy for discrete-time formation control through attitude synchronization. Unlike the Eulerian approximation, the first challenge lies in developing discrete-time models that capture both position and attitude motions, thereby complementing existing continuous-time systems with a discretized version. Then, two leader-following control protocols are designed, incorporating a jointly-connected topology to relax the connectivity requirements. The analysis of these systems often relies on the Lyapunov function, the existence of which may be hard to guarantee. Consequently, geometric properties of several polytopes are explored under the dynamic topologies and time-varying parameters. By extending the ergodicity results to leader-following scenarios, these properties are characterized as positively invariant sets. This invariance, which is independent of the existence of the Lyapunov function or the solvability of its associated criteria, provides a beneficial tool for analyzing time-variant systems. Utilizing this invariance and some mathematical techniques, the desired formation shape can be achieved in the cases where the attitudes of the followers synchronize with the leader. Finally, a numerical simulation validates the results. © 2014 IEEE.

关键词： Lyapunov functions

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