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Fabrication of graphene oxide decorated with poly(dimethyl amino ethyl methacrylate) brush for efficient Cr(Ⅵ) adsorption from aqueous solution

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Chinese Journal of Chemical Engineering 2024年第9期73卷 51-61页

作者： Alireza Nouri Siew Fen Chua Ebrahim Mahmoudi Abdul Wahab Mohammad Wei Lun Ang Department of Chemical and Process Engineering Faculty of Engineering and Built EnvironmentUniversiti Kebangsaan MalaysiaBangi 43600Malaysia Centre for Sustainable Process Technology(CESPRO) Faculty of Engineering and Built EnvironmentUniversiti Kebangsaan MalaysiaBangi 43600Malaysia Chemical and Water Desalination Engineering Program College of EngineeringUniversity of SharjahSharjah 27272United Arab Emirates

Confronting the severe health threats and environmental impacts of Cr(Ⅵ) in aquatic environments demands innovative and effective remediation approaches. In this study, Graphene oxide(GO)-decorated poly(dimethyl amino ethyl methacrylate)(PDMAEMA) brush nanocomposites(GOP1, GOP2, GOP3, and GOP4) were fabricated using atom transfer radical polymerization(ATRP) by the “graft from” *** resulting nanocomposites were utilized for removing Cr(Ⅵ) with good adsorption performance due to the electrostatic interaction of protonated nitrogen groups in the brush chains with negatively charged particles in the solution. The kinetic model of pseudo-second-order best represented the contaminants' adsorption characteristics. The Weber-Morris model further indicated that surface adsorption and intraparticle diffusion mechanisms primarily controlled the adsorption procedure. Additionally, the Langmuir and Temkin isotherm models were found to most accurately represent the adsorption characteristics of the pollutants on the nanocomposites, and GOP4 can achieve the maximum adsorption capacity of 164.4 mg·g^(-1). The adsorbents' capacity maintains above 85% after five cycles of adsorption-desorption. The nanocomposites in this study demonstrate promising potential for eliminating Cr(Ⅵ) from aqueous solutions.

关键词： Graphene oxide PDMAEMA brush Polymerization Nanoparticles Adsorption Chromium

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Resistive Switching in Biocompatible Glucose Films Doped With Honey for Highly Flexible Nonvolatile Memory Application

IEEE Journal on Flexible Electronics

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IEEE Journal on Flexible Electronics 2022年第4期1卷 207-213页

作者： Lee, Ke-Jing Lin, Hsin-Ni Pal, Parthasarathi Wang, Yeong-Her National Cheng-Kung University Institute of Microelectronics Department of Electrical Engineering Tainan701 Taiwan National Cheng-Kung University Program on Semiconductor Process Technology Academy of Innovative Semiconductor and Sustainable Manufacturing Tainan701 Taiwan National Sun Yat-sen University Department of Physics Kaohsiung804 Taiwan

A mixture of honey and glucose (GH) as a new natural biomaterial for resistive random access memory (RRAM) switching layer on polyethylene terephthalate (PET) substrate is presented. The flexible substrate allows the devices to be bent and used for a wider range of applications. These devices with the GH film exhibit good reproducibility and reliability over more than 300 cycles. Moreover, the ON/OFF ratio of these devices is over 105, and VSET and VRESET are lower than that of the device with a pure glucose film. The nonvolatile nature of the devices is confirmed by measuring retention for 104 s. This switching behavior is attributed to ohmic conduction and trap-controlled space charge-limited current (TC-SCLC) mechanisms that confirm filament formation and breakage at high-resistance state (HRS) and low-resistance state (LRS), respectively. © 2022 IEEE.

关键词： Sol-gel process

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SiO2Aerogel Mixed in Silicone Encapsulant to Improve Chromaticity Coordinate Inconsistencies of WLEDs

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IEEE Photonics technology Letters 2024年第4期36卷 207-210页

作者： Lin, Chun-Yu Lin, Chun-Liang Li, Jun-Ting Chen, Jean-Hong Hsu, Hao-Lin Chang, Ping-Chuan Su, Yan-Kuin National Cheng Kung University Program on Semiconductor Process Technology Academy of Innovative Semiconductor and Sustainable Manufacturing Tainan701401 Taiwan Kun Shan University Department of Electrical Engineering Green Energy Technology Research Center Tainan71000 Taiwan Kun Shan University Green Energy Technology Research Center The Department of Materials Engineering Tainan71000 Taiwan Taiwan ATM Company Tainan City74147 Taiwan Kun Shan University Green Energy Technology Research Center Tainan71000 Taiwan Kun Shan University Department of Electrical Engineering Tainan71000 Taiwan National Cheng Kung University Tainan701401 Taiwan Kun Shan University Department of Electrical Engineering The Center for Green Energy Technology Tainan71000 Taiwan

Porous SiO2 aerogel and yttrium aluminum garnet (YAG) phosphor is simultaneously mixed in silicone encapsulant, which can reduce the dispersion of color temperature and chromaticity coordinates of white light-emitting diodes (WLEDs) due to phosphor sedimentation after dispensing. The concentrations of YAG phosphor and SiO2 aerogel in the silicone encapsulant of WLEDs were mixed at 10 wt% and 1 wt%, respectively. Compared with the WLED without mixing SiO2 aerogel, the average correlated color temperature (CCT) difference in the light emitting angle range - 60° ∼ 60° decreased from 310K to 221K to obtain an 89K improvement. The average CCT of WLEDs along the central axis of luminescence was also reduced from 5450K (±320K) to 5040K (±109K) and the average luminous flux increased by 4.9%. The mixing of SiO2 aerogel in the silicone encapsulant can reduce the dispersion of the axial average CCT distribution of WLEDs due to different dispensing sequences, and the average CCT standard deviation is reduced from 168K to 64K to obtain a 62% improvement. The chromaticity coordinate distribution of WLEDs also converges from MacAdam ellipse's 5-step to 3-step. Mixing SiO2 aerogel in the silicone encapsulant can improve the distribution consistency of CCT and chromaticity coordinates of WLEDs using the dispensing process. © 1989-2012 IEEE.

关键词： Temperature measurement

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Biomass-Based Discrete Furan Oligomers as Materials for Electrochromic Devices

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ACS sustainable Chemistry and Engineering 2024年第1期12卷 459-469页

作者： Atayde, Eduardo C. Fong, Guan-Lun Yeh, Jyun-Yi Matsagar, Babasaheb M. Wang, Yu-Cheng Chen, De-Chian Peng, Chi-How Li, Yi-Pei Yamauchi, Yusuke Ho, Kuo-Chuan Wu, Kevin C.-W. Molecular Science and Technology Program Taiwan International Graduate Program (TIGP-MST) Academia Sinica No. 128 Sec. 2 Academia Road Taipei 11529 Taiwan Department of Chemistry National Tsing Hua University No. 101 Sec. 2 Kuang-Fu Road Hsinchu 30013 Taiwan Department of Chemical Engineering National Taiwan University No. 1 Sec. 4 Roosevelt Road Taipei 10617 Taiwan Sustainable Chemical Science and Technology Program Taiwan International Graduate Program (TIGP-SCST) Academia Sinica No. 128 Sec. 2 Academia Road Taipei 11529 Taiwan School of Chemical Engineering and Australian Institute for Bioengineering and Nanotechnology (AIBN) The University of Queensl Brisbane 4072 QLD Australia Department of Materials Process Engineering Graduate School of Engineering Nagoya University Nagoya 464-8603 Japan Institute of Polymer Science and Engineering National Taiwan University No.1 Sec. 4 Roosevelt Rd. Taipei 10617 Taiwan Department of Chemical Engineering and Materials Science Yuan Ze University No. 135 Yuandong Rd. Taoyuan 320 Taiwan

Electrochromic devices (ECDs) are materials that can undergo reversible changes in transmittance when exposed to different applied potentials. While many conjugated heterocyclic oligomers, such as oligothiophenes, have been developed for this purpose, there is no reported study on the use of discrete oligomeric furans as ECD materials. In this work, we introduce a furan trimer that can be utilized as a discrete electrochromic material, which transitions from light yellow to red and has a very high coloration efficiency of 1940 cm²/C at 507 nm. We propose that the reversible π-stack formation of the oligomer radical cations is behind this phenomenon, as evidenced by both experimental and computational results. The derivability of this oligomer from biomass and its facile synthesis make it an interesting alternative for other existing organic electrochromic materials. © 2023 American Chemical Society

关键词： electrochromism furan oligomer hydroxyalkylation−alkylation reaction solvatochromism π-stacks

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Energy Efficiency Project with Actions to Encourage the Rational and sustainable Use of Electric Energy 19

Energy Efficiency Project with Actions to Encourage the Rati...

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19th IEEE International Conference on Environment and Electrical Engineering and 2019 IEEE Industrial and Commercial Power Systems Europe, EEEIC/I and CPS Europe 2019

作者： Lemos, G.C. Faria, A.F. Viajante, G.P. Domingues, E.G. Domingos, J.L. Silva, S.B. Souto, O.C.N. Velloso, E.J.F. Franca, J.L. Graduate Program in Sustainable Process Technology IFG Goiânia-GO Brazil Graduate Program in Electrical and Computer Eng. UFG Goiânia-GO Brazil Graduate Program in Sustainable Process Technology IFG Itumbiara-GO Brazil Anima Projects Engineering Commerce Goiânia-GO Brazil

ISBN: (纸本)9781728106526

This work is the critical analysis of an Energy Efficiency Project (EEP) developed in an educational institution. The case-study is based on several fronts that synthesize the perspective of sustainability in a Solar Tree, an equipment to compose the landscape furniture with the capacity to generate electricity from a renewable source, symbolizing the project and acting as motivating agent in maintenance, and also contributing to the design of new actions with this bias. In the other fronts, the work includes the quantification of the level of energy efficiency of a building, besides promoting the retrofit of the lighting system and the installation of a photovoltaic generation system, all focusing on the rational use of electric energy, whose results show that the energy saved and the reduction in the peak of demand, as well as the installation of the photovoltaic plant, will bring the installation closer to the concept of energy selfsufficiency. © 2019 IEEE.

关键词： sustainable development

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Prediction of overall yield of Gynura procumbens from ethanol-water + supercritical CO₂ extraction using artificial neural network model

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Case Studies in Chemical and Environmental Engineering 2022年 5卷

作者： Idris, Sitinoor Adeib Markom, Masturah Abd Rahman, Norliza Mohd Ali, Jarinah School of Chemical Engineering College of Engineering Universiti Teknologi MARA Selangor Malaysia Chemical Engineering Program Faculty of Engineering & Built Environment UKM Bangi 43600 Selangor Malaysia Research Centre for Sustainable Process Technology (CESPRO) Faculty of Engineering & Built Environment UKM Bangi 43600 Selangor Malaysia

Gynura procumbens, also known as Sambung nyawa by Malays, is a traditional herb that can be found in Malaysian forests. Traditional Malays rely on this plant in many ways. The leaves can be eaten raw as a salad, and it is believed to have medicinal effects for humans suffering from cancer, diabetes, and other afflictions. The extraction of G. procumbens has been conducted using various techniques, including supercritical fluid extraction (SFE). The study presents the methodology for an artificial neural network (ANN) model with the intention of predicting the overall yield, Y_T of G. procumbens in supercritical fluid depending on the SFE parameter, namely, water content in ethanol (10–30% v/v), temperature (60–70 °C), and pressure (18–24 MPa). The overall yield from SFE was optimal with a 15.90% wt/wt sample at 30% water content in ethanol, 70 °C and 24 MPa. A three-layer ANN model was generated using the experimental data obtained. The Levenberg–Marquardt back-propagation (LMP) algorithm with a trainlm transfer function was used to predict the Y_T. A total of 1–8 neurons in the hidden layer were trained, and the most suitable network found was with 6 neurons in the hidden layer. The value of the mean square error (MSE) was 0.3011, and the coefficient of determination (R²) was 0.9877, showing that the (3-6-1) model is a better option for predicting the Y_T. © 2021 The Authors

关键词： Co-solvent Extraction Herbs Separation Supercritical fluid

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Synergetic strategy: upgrading fuel properties of waste starch composite fuels by blending torrefied spent coffee grounds

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Journal of the Taiwan Institute of Chemical Engineers 2024年

作者： Chen, Wei-Hsin Chen, Guan-Hong Lee, Kuan-Ting Gunarathne, Duleeka Sandamali Hoang, Anh Tuan Department of Aeronautics and Astronautics National Cheng Kung University Tainan701 Taiwan Research Center for Smart Sustainable Circular Economy Tunghai University Taichung407 Taiwan Department of Mechanical Engineering National Chin-Yi University of Technology Taichung411 Taiwan International Master's Degree Program on Energy Engineering National Cheng Kung University Tainan701 Taiwan Department of Chemical and Materials Engineering Tunghai University Taichung407 Taiwan Department of Chemical and Process Engineering University of Moratuwa Moratuwa10400 Sri Lanka Faculty of Engineering Dong Nai Technology University Bien Hoa City Viet Nam Graduate School of Energy and Environment Korea University 145 Anam-ro Seongbuk-gu Seoul02841 Korea Republic of

Background: This study presents a composite solid fuel upgrading strategy by blending torrefied spent coffee grounds (TS) into waste starch (WS) at the weight ratios of 0 wt%, 5 wt%, 20 wt%, and 35 wt%. When the blending ratio of TS exceeds 35 wt%, TS-WS composite fuel fails to pelletize. Blending TS in WS contributes to the higher heating value (HHV) and carbon content. Methods: The Taguchi method is utilized to identify the optimal torrefaction conditions for HHV of TS. The highest HHV of TS at 300°C (300-TSCG) is 31.76 MJ∙kg−1, which is about 2.08 times that of WS. The carbon content, HHV, ignition temperature, and combustion reactivity of 35%TS-WS composite fuel are 51.15 wt%, 21.06 MJ∙kg−1, 262°C, and 4.6 wt%∙min-1∙°C−1, respectively. Attenuated total reflectance spectrometer, contact angle, hygroscopicity, mildew observation, storability, and water activity of TS-WS composite fuel are analyzed, and the storability of TS-WS composite fuel is discussed. Significant findings: Compared with 0%TS-WS, the HHV of 35% TS-WS increases 38%, while the carbon content increases by 34%. The mechanical strength of TS-WS decreases with the increase of TS blending amount. The strategy of blending TS and WS can significantly reduce the generation of WS and spent coffee grounds (SCGs) and upgrade the quality of composite solid fuel. Accordingly, TS-WS is a promising composite solid fuel that can approach sustainable production of biofuels without compromising commercial viability. © 2024 Taiwan Institute of Chemical Engineers

关键词： Spent fuels

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Degradation of the antibiotic ciprofloxacin in urine by electrochemical oxidation with a DSA anode

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Chemosphere 2023年 344卷 140407页

作者： Felisardo, Raul José Alves Brillas, Enric Romanholo Ferreira, Luiz Fernando Cavalcanti, Eliane Bezerra Garcia-Segura, Sergi Graduate Program in Process Engineering Tiradentes University 300 Murilo Dantas Avenue SE Aracaju49032-490 Brazil Nanosystems Engineering Research Center for Nanotechnology-Enabled Water Treatment School of Sustainable Engineering and the Built Environment Arizona State University TempeAZ85287 United States Laboratori d′Electroquímica dels Materials i del Medi Ambient Secció de Química Física Facultat de Química Universitat de Barcelona Martí i Franqus 1-11 Barcelona08028 Spain Graduate Program in Genomic Sciences and Biotechnology Catholic University of Brasília Brasília71966-700 Brazil Institute of Technology and Research 300 Murilo Dantas Avenue SE Aracaju49032-490 Brazil

Ciprofloxacin (CIP) is a commonly prescribed fluoroquinolone antibiotic that, even after uptake, remains unmetabolized to a significant extent—over 70%. Unmetabolized CIP is excreted through both urine and feces. This persistent compound manages to evade removal in municipal wastewater facilities, leading to its substantial accumulation in aquatic environments. This accumulation raises concerns about potential risks to the health of various living organisms. Herein, we present a study on the remediation of CIP in synthetic urine by electrochemical oxidation in an undivided cell with a DSA (Ti/IrO2) anode and a stainless-steel cathode. Physisorbed hydroxyl radical formed at the anode surface from water discharge and free chlorine generated from Cl− oxidation were the main oxidizing agents. The effect of pH and current density (j) on CIP degradation was examined, and its total removal was easily achieved at pH ≥ 7.0 and j ≥ 60 mA cm−2 due to the action of free chlorine. The CIP decay always followed a pseudo-first-order kinetics. The components of the synthetic urine were also oxidized. The main nitrogenated species released was NH3. A very small concentration of free chlorine was quantified at the end of the treatment, thus demonstrating the good performance of electrochemical oxidation and its effectiveness to destroy all the organic pollutants. The present study demonstrates the simultaneous oxidation of the organic components of urine during CIP degradation, thus showing a unique perspective for its electrochemical oxidation that enhances the environmental remediation strategies. © 2023 Elsevier Ltd

关键词： Electrochemical oxidation

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Quantification of C02 emission reductions from energy efficiency actions and solar photovoltaic generation at the Federal Institute of Education, Science, and technology of Goiás

Renewable Energy and Power Quality Journal

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Renewable Energy and Power Quality Journal 2021年 19卷 45-50页

作者： Vidal, M.A. Faria, A.F. Stach, A.H.M. Netou, D.P. Pinto, L.S. Pinlio, A.G. Domingues, E.G. Master’s Program in Technology of Sustainable Process Federal Institute of Education Science and Technology Goias-Cainpuj Rua 75. n°46 - Centro Goiania - GO74055-110 Brazil Electiical Engineering Control and Automation Engineering Program Federal Institute of Education Science and Technology Goias-Cainpuj Rua 75. n°46 - Centro Goiania - GO74055-110 Brazil NeXT - Nucleus of Experimental and Technological Studies Federal Institute of Education Science and Technology Goias-Cainpuj Rua 75. n°46 - Centro Goiania - GO74055-110 Brazil

In 2016. die Brazilian Agency of Electric Energy-launched a public call for research and development projects to reduce barriers to implementing energy efficiency projects and own electricity generation. One objective of this public call was to encourage pilot projects at the Brazilian public higher education institutions. In this context, the Federal Institute of Education. Science, and technology of Goias has approved the research project, entided "Energy efficiency and mini generation ai the Federal Institute of Education. Science, and technology - IFG." The project consists of implementing energy efficiency actions and installing photovoltaic distributed generation (mini generation) in twelve of the fourteen IFG campuses. The main objective of this work is to quantify the C0;emission reductions from die project through the methodologies used by the United Nations Framework Climate Change Convention for projects under the Clean Development Mechanism The emission reductions over the project lifetime was estimated at approximately 37,400 iC’O- equivalent, evidencing the environmental benefit to be provided by the referred project. © 2021, European Association for the Development of Renewable Energy, Environment and Power Quality (EA4EPQ). All rights reserved.

关键词： Energy efficiency

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Synthetic series of electricity generation through a photovoltaic system by using different panel temperature models

Renewable Energy and Power Quality Journal

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Renewable Energy and Power Quality Journal 2021年 19卷 39-44页

作者： Stach, A.H.M. Neto, D.P. Vidal, M.A. Souto, O.C.N. Silva, S.B. Domingues, E.G. Master’s Program in Sustainable Process Technology Federal Institute of Education Science and Technology of Goiás Brazil Rua 75 nº46-Centro Goiânia-GO74055-110 Brazil Electrical Engineering/Control and Automation Engineering Program Federal Institute of Education Science and Technology of Goiás Brazil Rua 75 nº46-Centro Goiânia-GO74055-110 Brazil NeXT-Nucleus of Experimental and Technological Studies Federal Institute of Education Science and Technology of Goiás Brazil Rua 75 nº46-Centro Goiânia-GO74055-110 Brazil

The electric energy produced by photovoltaic systems is a function of several variables that present random behavior, such as solar irradiance, ambient temperature, wind speed, and relative humidity. Several models describe the energy produced by these systems, which reflect the various factors that influence the generation and how significant these influences are. In this way, the present work aims to compare some panel temperature models and the electrical energy produced from a photovoltaic system located in the Midwest of Brazil. The applied methodology aims to evaluate the expected averages and standard deviations of the monthly synthetic series of generated energy to identify the main random variables that influence the electric generation. The results indicate the model that best describes the physical system concerning the randomness of the variables involved, the photovoltaic technology, the location, and the measurement period. © 2021, European Association for the Development of Renewable Energy, Environment and Power Quality (EA4EPQ). All rights reserved.

关键词： Stochastic models

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