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Simultaneous Photodegradation of Remdesivir, Favipiravi, and Diclofenac from Aqueous Solutions Using a Quaternary Plasmonic Ag/Ag-Sg-Tio2-Rgo Photocatalyst: Synthesis, Characterization, and Optimization with Central Composite Design

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SSRN 2024年

作者： Monjezi, Zahra Tarlani, Aliakbar Esfahani, Hadi Asghar, Anam Salemi, Amir Vosough, Maryam Department of Clean Technologies Chemistry and Chemical Engineering Research Center of Iran Tehran Iran Department of Chemical Process Chemistry and Chemical Engineering Research Center of Iran Tehran Iran Instrumental Analytical Chemistry University of Duisburg-Essen Universitätsstr. 5 EssenD-45141 Germany

In response to the COVID-19 pandemic, various nations have expedited the approval of several broad-spectrum antiviral drugs, including remdesivir (RDV) and favipiravir (FAV), and diclofenac (DCF) for emergency use, leading to their increased presence in sewage effluents. Our study presents a new quaternary plasmonic photocatalyst, Ag/Ag-SG-TiO2-rGO, designed for efficient removal of these contaminants from water samples. This photocatalyst, which incorporates 30% Ag plasmonic into the Ag/Ag-SG-TiO2-rGO framework, demonstrated a remarkable ability to remove a high percentage of the targeted pollutants within 40 minutes under visible light. This efficiency is attributed to the surface plasmon resonance (SPR) generated by metallic Ag nanoparticles, the Schottky barrier at the Ag-TiO2 interface, and the optimal energy alignment between the TiO2 conduction band and the rGO work function. The degradation kinetics, following a pseudo-first-order model, were analyzed using an optimized LC-MS/MS method for pollutant degradation monitoring. Additionally, the photodegradation process was modeled and optimized using a central composite design (CCD) approach. Experiments in sewage treatment plant effluent and tap water indicated that matrix components could reduce photodegradation efficiency, especially in highly contaminated samples. This study sheds light on the photodegradation of anti-COVID-19 drugs and offers insights for their remediation in aquatic environments. © 2024, The Authors. All rights reserved.

关键词： COVID-19

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Techno-economic assessment for bio coal production from brewers spent grain

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South African Journal of chemical engineering 2022年 40卷 1-9页

作者： Mugoronji, M. Manyuchi, M.M. Sukdeo, N. Stinner, W. Department of Chemical and Process Systems Engineering School of Engineering and Technology Harare Institute of Technology Zimbabwe Department of Operations and Quality Management Faculty of Engineering and the Built Environment University of Johannesburg South Africa Germany Biomass Research Center Leipzig Germany

Tons of organic wastes are being generated from household, domestic and industrial waste. This waste if left untreated results in the emission of greenhouses gases such as methane and carbon dioxide, in overall resulting in climate change effects. On the other hand, the organic waste provides a valuable source of raw material for the production of bio coal, which is green and is renewable. In this study, brewery waste was converted to bio coal using the hydrothermal carbonization technology. Bio coal with a heating value of 26.1 MJ/kg was then produced. An economic assessment indicated that a total capital investment of USD 7.58 million is required for a plant that produces 69 tons/day. The production cost is USD 190.60 per tonne;the selling price was pegged at USD 200.00 which is less than the market value of fossil coal by USD10.00. The net present value of utilising brewery waste as a raw material in bio coal production was positive;with a payback period of 4.62 years and a 21.7% return on investment. © 2022

关键词： Bio coal Climate change mitigation Economic feasibility Solid waste management

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Catalytic Cracking of 1-Dodecene to Light Olefins Over Steam-Treated Phosphorus-Modified Zsm-5 Zeolites

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SSRN 2024年

作者： Ju, Hae Ryeong Kang, Na Young Kim, Do Kyoung Park, Yong-Ki Kim, Sungtak Shin, Jiho Center for Low-Carbon Chemical Process Korea Research Institute of Chemical Technology Daejeon34114 Korea Republic of Department of Chemical Engineering and Applied Chemistry Chungnam National University Daejeon34134 Korea Republic of

Escalating global concerns about environmental issues has placed increased emphasis on the development of effective chemical production methods employing the pyrolysis of waste plastics. This study focuses on development of a zeolite catalyst for light olefin production from the pyrolysis oil derived from waste polyolefin plastics characterized by a substantial presence of olefins with varying carbon numbers, using 1-dodecene as a model compound. Here, a series of H-ZSM-5 and phosphorus-modified ZSM-5 zeolites with varying Si/Al (15, 40, and 140) and P/Al ratios (0, 0.5, 0.7, and 1.0) were prepared with and without steam treatment. Their physicochemical properties and catalytic performance in 1-dodecene cracking at 500 and 600 °C were compared. The introduction of P has been shown to not only reduce the number and strength of acid sites but also contribute to preserving or generating the necessary acid sites for the cracking of olefins even after steaming at high temperatures. Following steam treatment, optimal acid site preservation and consequently, the highest C2–C4 olefin yield, were achieved using a P/Al ratio of 0.7 and Si/Al ratio of 15. Given its high C2–C4 olefin yield, hydrothermal stability, and complete regeneration after deactivation by coke formation, our phosphorus-modified ZSM-5 zeolite is a promising catalyst for the cracking of waste plastic pyrolysis oil. © 2024, The Authors. All rights reserved.

关键词： Catalysts

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Synergistic Enhancement of Zn-Air Battery Performance Via Integration of Ni-Doped Cobalt Sulfide Nanoparticles within N, S-Doped Carbon Matrix

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SSRN 2024年

作者： Kim, Hyejin Min, Kyeongseok Kwon, Kyeongmin Shim, Sang Eun Baeck, Sung-Hyeon Department of Chemistry and Chemical Engineering Education and Research Center for Smart Energy Materials and Process Inha University Incheon22212 Korea Republic of

Exploring precious metal-free bifunctional electrocatalysts for both the oxygen reduction reaction (ORR) and the oxygen evolution reaction (OER) is essential for the practical application of rechargeable Zn-air battery (ZAB). Herein, Ni-doped Co9S8 nanoparticles embedded in a defect-rich N, S co-doped carbon matrix (d-NixCo9-xS8@NSC) are synthesized via a facile pyrolysis and acid treatment process. The introduction of abundant defects in both the carbon matrix and metal sulfide provides numerous active sites and significantly enhances the electrocatalytic performances for both the ORR and OER. d-NixCo9-xS8@NSC exhibits a superior half-wave potential of 0.841 V vs. RHE for the ORR and delivers a low overpotential of 0.329 V at 10 mA cm−2 for the OER. Additionally, Zn-air secondary battery using d-NixCo9-xS8@NSC as the air cathode displays a higher specific capacity of 734 mAh gZn−1 and a peak power density of 148.03 mW cm−2 compared to those of state-of-the-art Pt/C-RuO2 (673 mAh gZn−1 and 136.9 mW cm−2, respectively). These findings underscore the potential of d-NixCo9-xS8@NSC as a high-performance electrocatalyst for secondary ZABs, offering new perspectives on the design of efficient noble metal-free electrocatalysts for future energy storage and conversion applications. © 2024, The Authors. All rights reserved.

关键词： Cobalt compounds

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Synergistic Enhancement of Zn-Air Battery Performance Via Integration of Ni-Doped Cobalt Sulfide Nanoparticles within N, S-Doped Carbon Matrix

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SSRN 2024年

Exploring precious metal-free bifunctional electrocatalysts for both the oxygen reduction reaction (ORR) and the oxygen evolution reaction (OER) is essential for the practical application of rechargeable Zn-air battery (ZAB). Herein, Ni-doped Co9S8 nanoparticles embedded in a defect-rich N, S co-doped carbon matrix (d-NixCo9-xS8@NSC) are synthesized via a facile pyrolysis and acid treatment process. The introduction of abundant defects in both the carbon matrix and metal sulfide provides numerous active sites and significantly enhances the electrocatalytic performances for both the ORR and OER. d-NixCo9-xS8@NSC exhibits a superior half-wave potential of 0.841 V vs. RHE for the ORR and delivers a low overpotential of 0.329 V at 10 mA cm−2 for the OER. Moreover, a rechargeable ZAB using d-NixCo9-xS8@NSC as the air cathode displays a higher specific capacity of 734 mAh gZn−1 and a peak power density of 148.03 mW cm−2 compared to those values of precious metal-based ZAB (673 mAh gZn−1 and 136.9 mW cm−2, respectively). These findings underscore the potential of d-NixCo9-xS8@NSC as high-performance electrocatalyst for rechargeable ZABs, offering new perspectives on the design of efficient and cost-effective electrocatalysts for energy storage applications. © 2024, The Authors. All rights reserved.

关键词： Cost effectiveness

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Enhanced Electrocatalytic Performance of Double-Shell Structured Ni xFe 2-Xp/NiFe 2O 4 for Oxygen Evolution Reaction and Anion Exchange Membrane Water Electrolysis

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SSRN 2024年

作者： Kim, Junseong Min, Kyeongseok Lee, Hyunjin Kwon, Hyeonji Shim, Sang Eun Baeck, Sung-Hyeon Department of Chemistry and Chemical Engineering Education and Research Center for Smart Energy Materials and Process Inha University Incheon22212 Korea Republic of

The development and characterization of a double-shell structured NixFe2-xP/NiFe2O4 electrocatalyst for enhanced oxygen evolution reaction (OER) and anion exchange membrane water electrolysis (AEMWE) are investigated. The electrocatalyst was synthesized via a sequential process involving solvothermal, calcination, and thermal phosphidation process using metal-organic framework (MOF) template. Physicochemical characterization techniques including scanning electron microscopy (SEM), transmission electron microscopy (TEM), X-ray diffraction (XRD), X-ray photoelectron spectroscopy (XPS), and electrochemical methods were employed to assess its structural, compositional, and electrocatalytic properties. The NixFe2-xP/NiFe2O4 exhibited superior electrocatalytic performance with low overpotentials and high turnover frequencies compared to NiFe-LDH, NiFe2O4, NiFe/NiFe2O4, and commercial RuO2. Additionally, the AEMWE cell equipped with a NixFe2-xP/NiFe2O4 anode showed outstanding performance (1.76 Vcell at 1000 mA cm−2). Enhanced electrocatalytic activity was attributed to its unique double-shell morphology, increased surface polarity from phosphorus incorporation, and efficient charge transfer facilitated by heterointerfaces between bimetallic phosphide and spinel oxide phases. This study underscores the promising potential of NixFe2-xP/NiFe2O4 as a high-performance electrocatalyst for sustainable water electrolysis applications. © 2024, The Authors. All rights reserved.

关键词： High resolution transmission electron microscopy

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Development of an efficient bifunctional electrocatalyst based on Co/CoSe2 nanoparticles embedded in N, Se co-doped carbon for AEMFC and rechargeable Zn-air battery

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SSRN 2024年

作者： Seong, Haemin Min, Kyeongseok Lee, Geunchang Kwon, Kyeongmin Baeck, Sung-Hyeon Department of Chemistry and Chemical Engineering Education and Research Center for Smart Energy Materials and Process Inha University Incheon22212 Korea Republic of

We suggest a hollow-structured N, Se dual-doped carbon framework embedded with Co/CoSe2 nanoparticles (Co/CoSe2@NSeC) as highly efficient bifunctional electrocatalyst for the oxygen reduction reaction (ORR) and oxygen evolution reaction (OER). The prepared electrocatalyst exhibits high electrochemical active surface area attributed to its unique hollow/porous structure and defective heteroatom doping sites. Furthermore, the strongly coupled heterojunction between Co and CoSe2 species not only provides abundant and highly active sites but also generates built-in electric field, thereby promoting electron transfer during the electrocatalytic reaction. Based on the above considerations, the prepared catalyst shows excellent bifunctional electrocatalytic performance. Leveraging the excellent ORR activity of Co/CoSe2@NSeC, alkaline exchange membrane fuel cells (AEMFC) with the Co/CoSe2@NSeC as air cathode exhibits high power density of 171.23 mW cm‒2. Furthermore, the rechargeable Zn-air battery employing the Co/CoSe2@NSeC shows high specific capacity (729.4 mAh gZn−1), peak power density (160.77 mW cm‒2), and sustained stability over 300 cycles. © 2024, The Authors. All rights reserved.

关键词： Selenium compounds

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Enhanced Electrocatalytic Performance of Double-Shell Structured Nixfe2-Xp/Nife2o4 for Oxygen Evolution Reaction and Anion Exchange Membrane Water Electrolysis

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SSRN 2024年

关键词： Electrocatalysts

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Hollow-Structured Cobalt Sulfide Electrocatalyst for Alkaline Oxygen Evolution Reaction: Rational Tuning of Electronic Structure Using Iron and Fluorine Dual-Doping Strategy

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SSRN 2024年

作者： Kim, Hyejin Min, Kyeongseok Song, Giseong Kim, Junseong Ham, Hyung Chul Baeck, Sung-Hyeon Department of Chemistry and Chemical Engineering Education and Research Center for Smart Energy Materials and Process Inha University Incheon22212 Korea Republic of

Efficiency of water electrolysis critically relies on the development of highly active electrocatalysts for the oxygen evolution reaction (OER). In this study, we propose facile preparation method for hollow-structured nanospheres of Fe and F dual-doped CoS2 (Fe-CoS2-F) as efficient OER electrocatalyst. The uniform hollow and porous structure of the Fe-CoS2-F enhances the specific surface area and increases the number of exposed active sites. Furthermore, Fe and F dual-dopants synergistically adjust the surface electronic structure, thereby promoting the adsorption/desorption of reaction intermediates on the active sites during the alkaline OER process. As a result, the Fe-CoS2-F exhibits outstanding OER activity, demonstrating low overpotential of 298 mV at current density of 10 mA cm−2 and small Tafel slope of 46.0 mV dec−1. Theoretical calculations support these findings by revealing that the incorporation of dual-dopants into the CoS2 structure reduces the overly strong adsorption energy of reaction intermediates in the rate determining step. © 2024, The Authors. All rights reserved.

关键词： Sulfur compounds

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A master-slave generalized predictive synchronization control for preheating process of multi-cavity hot runner system

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Chinese Journal of chemical engineering 2023年第10期62卷 270-280页

作者： Hongyi Qu Shengyong Mo Ke Yao Zhao-Xia Huang Zhihao Xu Furong Gao Institute of Intelligent Manufacturing Guangdong Academy of SciencesGuangdong Key Laboratory of Modern Control TechnologyGuangzhou 510070China Fok Ying Tung Graduate School The Hong Kong University of Science and TechnologyGuangzhou 511442China Department of Chemical and Biological Engineering The Hong Kong University of Science and TechnologyHong Kong 999077China National Engineering Research Center of Novel Equipment for Polymer Processing Department of Mechanical and Automotive EngineeringSouth China University of TechnologyGuangzhou 510641China

As a key component of injection molding,multi-cavity hot runner(MCHR)system faces the crucial problem of polymer melt filling imbalance among the *** thermal imbalance in the system has been considered as the leading ***,the solution may rest with the synchronization of those heating processes in MCHR *** paper proposes a’Master-Slave’generalized predictive synchronization control(MS-GPSC)method with’***’strategy for preheating stage of MCHR *** core of the proposed method is choosing the heating process with slowest dynamics as the’Master’to track the setpoint,while the other heating processes are treated as‘Slaves’tracking the output of’Master’.This proposed method is shown to have the good ability of temperature *** corresponding analysis is conducted on parameters tuning and stability,simulations and experiments show the strategy is effective.

关键词： process control Thermodynamics process Model-predictive control Multi-cavity hot runner system Master-Slave synchronization Mr.Slowest

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