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Coupled carbon structure and iron species for multiple periodate-based oxidation reaction

Chemical engineering Journal 2023年 455卷

作者： Ling Xiang Eydhah Almatrafi Hailan Yang Haoyang Ye Fanzhi Qin Huan Yi Yukui Fu Xiuqin Huo Wu Xia Hong Li Ming Yan Chengyun Zhou Guangming Zeng Xiaofei Tan College of Environmental Science and Engineering Hunan University and Key Laboratory of Environmental Biology and Pollution Control (Hunan University) Ministry of Education Changsha 410082 PR China Center of Research Excellence in Renewable Energy and Power Systems Center of Excellence in Desalination Technology Department of Mechanical Engineering Faculty of Engineering-Rabigh King Abdulaziz University Jeddah 21589 Saudi Arabia

The vital roles of synergetic carbon structure and iron species in periodate (PI)-based oxidation reaction remains unclear. In this study, multiple active species were identified as Fe(IV), 1 O 2 , •O 2 − , and IO 3 • in the magnetic ferrite-modified biochar (MFBC)/PI process. The MFBC/PI system maintained stable degradation efficiency under wide pH ranges and the presence of various interfering anions. A unique continuous cycle experiment verifies the contribution of iron leaching-precipitation equilibrium and redox equilibrium to the degradation efficiency of PI/MFBC system. Moreover, except carbonyl functional groups (C O) on biochar could activate PI, the interacted biochar-Fe provides an active site dispersion and fast electron transfer. The attack sites and degradation pathways on DDA were determined with DFT, P and S atoms on diphenylamine dithiophosphoric acid (DDA) were suggested to be the most active sites in MFBC/PI systems. Overall, this work investigated the mechanism of PI activation by the synergistic metal–carbon at the solid–liquid interface of heterogeneous catalysts, would provide a new perspective into the catalytic activation of PI by iron-carbon composites.

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Spatial confinement: A green pathway to promote the oxidation processes for organic pollutants removal from water

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Water research 2023年 233卷 119719页

作者： Huan Yi Eydhah Almatrafi Dengsheng Ma Xiuqing Huo Lei Qin Ling Li Xuerong Zhou Chengyun Zhou Guangming Zeng Cui Lai College of Environmental Science and Engineering Hunan University and Key Laboratory of Environmental Biology and Pollution Control (Hunan University) Ministry of Education Changsha 410082 P.R. China Center of Research Excellence in Renewable Energy and Power Systems Center of Excellence in Desalination Technology Department of Mechanical Engineering Faculty of Engineering-Rabigh King Abdulaziz University Jeddah 21589 Saudi Arabia. College of Environmental Science and Engineering Hunan University and Key Laboratory of Environmental Biology and Pollution Control (Hunan University) Ministry of Education Changsha 410082 P.R. China. Center of Research Excellence in Renewable Energy and Power Systems Center of Excellence in Desalination Technology Department of Mechanical Engineering Faculty of Engineering-Rabigh King Abdulaziz University Jeddah 21589 Saudi Arabia. Electronic address: zgming@***. Center of Research Excellence in Renewable Energy and Power Systems Center of Excellence in Desalination Technology Department of Mechanical Engineering Faculty of Engineering-Rabigh King Abdulaziz University Jeddah 21589 Saudi Arabia. Electronic address: laicui@***.

Organic pollutants removal from water is pressing owing to the great demand for clean water. Oxidation processes (OPs) are the commonly used method. However, the efficiency of most OPs is limited owing to the poor mass transfer process. Spatial confinement is a burgeoning way to solve this limitation by use of nanoreactor. Spatial confinement in OPs would (i) alter the transport characteristics of protons and charges; (ii) bring about molecular orientation and rearrangement; (iii) cause the dynamic redistribution of active sites in catalyst and reduce the entropic barrier that is high in unconfined space. So far, spatial confinement has been utilized for various OPs, such as Fenton, persulfate, and photocatalytic oxidation. A comprehensive summary and discussion on the fundamental mechanisms of spatial confinement mediated OPs is needed. Herein, the application, performance and mechanisms of spatial confinement mediated OPs are overviewed firstly. Subsequently, the features of spatial confinement and their effects on OPs are discussed in detail. Furthermore, environmental influences (including environmental pH, organic matter and inorganic ions) are studied with analyzing their intrinsic connection with the features of spatial confinement in OPs. Lastly, challenges and future development direction of spatial confinement mediated OPs are proposed.

关键词： Local enrichment of substances Mass transfer Organic polluted water Oxidation process Spatial confinement

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Magnetic-brightening and control of dark exciton in CsPbBr3 perovskite

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Science China Materials 2020年第8期63卷 1503-1509页

作者： Zhongtai Shi Shoaib Muhammad Longjiang Deng Zhen Liu Lei Bi Linbo Zhang Li Zhang Peiheng Zhou Haiyan Chen Haipeng Lu Jianliang Xie Dong Li Anlian Pan Bo Peng National Engineering Research Center of Electromagnetic Radiation Control Materials School of Electronic Science and EngineeringUniversity of Electronic Science and Technology of ChinaChengdu 611731China Key Laboratory for Micro-Nano Physics and Technology of Hunan Province State Key Laboratory of Chemo/Biosensing and ChemometriscsCollege of Materials Science and EngineeringHunan UniversityChangsha 410082China State Key Laboratory of Electronic Thin Films and Integrated Devices University of Electronic Science and Technology of ChinaChengdu 610054China Key Laboratory of Multi-Spectral Absorbing Materials and Structures of Ministry of Education University of Electronic Science and Technology of ChinaChengdu 610054China

Exploring the fine-structure of cesium lead bromide(CsPbBr3)perovskite nanocrystals(NCs)is not only vital to fundamental understanding of recombination mechanism of exciton but also crucial for improving the performance of quantum light emitters and spintronic devices Herein,utilizing low-temperature magneto-photoluminescence(PL)measurement,we provide the direct PL spectral feature of the dark exciton in CsPbBr3 single crystal,and demonstrate that the singlet dark exciton is located^20 meV below the triplet bright ***,no significant polarization effect was measured from magnetic-polarization method,indicating that there is no spin selectivity for dark exciton.

关键词： perovskite materials CsPbBr3 dark exciton magnetic field brightening

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Insight into the effect of pyrolysis temperature on photoreactivity of biochar-derived dissolved organic matter: Impacts of aromaticity and carbonyl groups

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The Science of the total environment 2023年 871卷 162048页

作者： Hanzhuo Luo Eydhah Almatrafi Wenjun Wang Yang Yang Danlian Huang Weiping Xiong Min Cheng Chengyun Zhou Yin Zhou Qing Lin Guoge Fang Guangming Zeng Chen Zhang College of Environmental Science and Engineering Hunan University and Key Laboratory of Environmental Biology and Pollution Control Hunan University Ministry of Education Changsha Hunan 410082 PR China Center of Research Excellence in Renewable Energy and Power Systems Center of Excellence in Desalination Technology Department of Mechanical Engineering Faculty of Engineering-Rabigh King Abdulaziz University Jeddah 21589 Saudi Arabia. School of Resources and Environment Hunan University of Technology and Business Changsha 410205 China. Department of Chemical and Materials Engineering University of Alberta Edmonton Alberta T6G 1H9 Canada. College of Environmental Science and Engineering Hunan University and Key Laboratory of Environmental Biology and Pollution Control Hunan University Ministry of Education Changsha Hunan 410082 PR China. Center of Research Excellence in Renewable Energy and Power Systems Center of Excellence in Desalination Technology Department of Mechanical Engineering Faculty of Engineering-Rabigh King Abdulaziz University Jeddah 21589 Saudi Arabia. Electronic address: zgming@***. College of Environmental Science and Engineering Hunan University and Key Laboratory of Environmental Biology and Pollution Control Hunan University Ministry of Education Changsha Hunan 410082 PR China. Electronic address: zhangchen@***.

Practical application of biochar may result in more biochar-derived dissolved organic matter (denoted as BDOM) inevitably release into surface waters by infiltration and surface runoff. The photochemical reaction of BDOM has gained intense attention, which played a key role in the fate of organic contaminants. However, the relationships between specific characteristics of BDOM and its photoreactivity are still uncertain. In this study, the characteristics of BDOM pyrolyzed from rice husk derived biochar at different temperature (from 400 °C to 700 °C) and their effect on the photodegradation of oxytetracycline (OTC) were carefully investigated. The C NMR and EEM results indicated the dominated component of BDOM was gradually turned from humic acid like substances with low aromaticity to high aromaticity with abundant oxygen-containing functional groups as pyrolytic temperature increases. Experimental results showed that the apparent rate constants (k) of BDOM700 (4.53 × 10 min) for OTC photodegradation was approximately one order of magnitude higher than BDOM400 (4.52 × 10 min), which was closely correlated with their aromaticity (R = 0.944). It was found that BDOM* rather than O played the major role in BDOM mediated photodegradation of OTC (80.13 % vs 14.34 %), and the carbonyl-containing group was identified as the main BDOM* precursor by NaBH reduction experiment. This work highlighted both aromaticity and carbonyl group contents were critical indicators for assessing the potential to generate BDOM* and corresponding photoreactivity.

关键词： Dissolved organic matter Electron transfer Photochemistry Pyrolysis temperature Triplet state

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Technological advances and sustainable strategies for electrolytic manganese wastewater treatment: A critical review

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Process Safety and Environmental Protection 2025年 199卷

作者： Zhang, Chenyang Du, Ronghao Wang, Rong Sun, Wei Luo, Yueping Yu, Zhiyuan Engineering Research Center of Ministry of Education for Carbon Emission Reduction in Metal Resource Exploitation and Utilization School of Mineral Processing and Bio-engineering Central South University Changsha410083 China College of New Energy and Mining Xinjiang University of Technology Xinjiang Hotan84800 China Hunan Key Laboratory of Water Pollution Control Changsha410002 China

The rapid expansion of the electrolytic manganese industry has generated substantial volumes of electrolytic manganese wastewater (EMW), characterized by elevated concentrations of NH₃-N, Mn²⁺, Mg²⁺, and SO₄²⁻ within a strongly acidic matrix. This complex wastewater is both a hazardous waste stream and a potential resource pool, where manganese concentrations exhibit significant fluctuations across production phases, complicating purification and metal recovery processes. This critical review methodically examines EMW generation mechanisms, pollutant migration pathways, and associated ecological risks, while evaluating conventional and emerging treatment technologies through comparative analysis of their physicochemical principles, operational merits, and technical limitations. By pinpointing current technological bottlenecks in selective extraction and energy-efficient purification, we propose strategic directions for hybrid process integration and circular economy-driven solutions, offering critical perspectives for achieving near-zero wastewater discharge and sustainable manganese valorization in industrial applications. © 2025 The Institution of Chemical Engineers

关键词： Manganese removal (water treatment)

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Advanced converter collaborative control method based on smart contract 11

Advanced converter collaborative control method based on sma...

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11th IET International Conference on Advances in Power System control, Operation and Management, APSCOM 2018

作者： Xin, Kaihua Duan, Bin Yan, Yinxin Hunan Province Engineering Research Center for Multi-Energy Collaborative Control Technology Hunan Province Cooperative Innovation Center for Wind Power Equipment and Energy Conversion College of Information Engineering Xiangtan University Xiangtan Hunan411105 China

ISBN: (纸本)9781839530043

In this paper, a cooperative control method of advanced converter using smart contract is proposed in the Micro-grid with uncertain renewable energy output. The problem of power quality in Micro-grid is solved by using the active operation decision of the microgrid converter as the goal. First, the information interaction mechanism and model between the central Micro-grid converters is proposed in this paper. When the different strategies in the distribution network are switched, the real-time transaction requests can be initiated to other converters in the Micro-grid, and the disturbance of the power quality can be eliminated by the other converters in Micro-grid, and the dynamic balance of the power quality of the Micro-grid can be maintained. Then, a Vickrey-Clarke-Groves(VCG) auction method was introduced to encourage proprietor bidding of her neighbors, and the mechanism of distributed decision making and cooperative autonomous operation is realized by using smart contract. Among them, smart contract is signed between the various converters. On the one hand, the update of the state in the control cycle is realized, which makes the converter take more responsibilities and participate in the power quality control. To a certain extent, the effectiveness of the method is *** addition, rewards and penalties are given according to the achievement of the smart contract between the converters, which reduces the default rate of the owners. This degrading transaction process improves the security and completeness of the transaction. It provides more means to solve the power quality of the power grid and ensures the safe and reliable operation of the distribution network. © 2018 Institution of engineering and technology. All rights reserved.

关键词： Smart contract

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Passive Integrations for Г-Z Source & DAB DC-AC Bidirectional Converter

Passive Integrations for Г-Z Source & DAB DC-AC Bidirection...

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Annual IEEE Conference on Applied Power Electronics Conference and Exposition (APEC)

作者： Jie Xiong Jianhong Jia Cheng Deng College of Electrical Engineering ZheJiang University Hangzhou China School of Transport Manegement Hunan Railway Professional Technology College Zhuzhou China Hunan Multi-energy Collaborative Control Engineering Technology Research Center Xiangtan University Xiangtan China

ISBN: (纸本)9781538683316

In order to increase the stability and improve the transfer efficiency of PV (Photovoltaic) micro-inverter, match the requirement of grid and achieve a clean energy, a novel topology is put forward which consists one ⌈-Z source boost converter, one DAB (dual-active bridge) converter for DC to DC, one inverter with LCL filter, and one DAB converter for battery. Furthermore, two integrated units for ⌈-Z source and LCL filter with planar PCB (printed circuit board) integration technique, and one integrated unit for two DAB converters with FMLF (flexible multi-layer foil) integration technique are proposed to reduce the volume and weight of the novel topology. Moreover, the parameter design of the FMLF integrated unit is underlined. And one prototype is built to prove the feasibility of the proposed ideas for a 400 W novel topology.

关键词： Topology Inductors Inverters Power harmonic filters Batteries Prototypes Dielectrics

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Optimization of SRM Direct Instantaneous Torque control Strategy based on Improved Firefly Algorithm

Optimization of SRM Direct Instantaneous Torque Control Stra...

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IEEE Conference on energy Internet and energy System Integration (EI2)

作者： Jiangyong Liu Lixiong Wang Lingzhi Yi Guanghui Zhu Xinjian Yin College of Information Engineering Xiangtan University Hunan Province Engineering Research Center for Multi-Energy Collaborative Control Technology Xiangtan China XEMC Wind Power Co. Ltd Xiangtan China

ISBN: (数字)9781728131375

ISBN: (纸本)9781728131382

The direct instantaneous torque control has weak anti-interference ability and insufficient torque ripple optimization. In this paper, a method based on improved firefly algorithm to optimize SRM direct instantaneous torque control is proposed. On the basic of proportional integral control, the improved firefly algorithm is used to optimize the parameters which will help to find the optimal simulation parameters automatically. The method proposed in this paper has reduced torque ripple and improved dynamic response of the system. The experimental simulation verifies its effectiveness.

关键词： Reluctance motors Torque Optimization Torque control Torque measurement Inductance

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Nitrogen-doped carbon-based single-atom Fe catalysts: Synthesis, properties, and applications in advanced oxidation processes

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Coordination Chemistry Reviews 2023年 475卷

作者： Yuxi Zeng Eydhah Almatrafi Wu Xia Biao Song Weiping Xiong Min Cheng Ziwei Wang Yuntao Liang Guangming Zeng Chengyun Zhou College of Environmental Science and Engineering and Key Laboratory of Environmental Biology and Pollution Control (Ministry of Education) Hunan University Changsha 410082 PR China Center of Research Excellence in Renewable Energy and Power Systems Center of Excellence in Desalination Technology Department of Mechanical Engineering Faculty of Engineering-Rabigh King Abdulaziz University Jeddah 21589 Saudi Arabia

Single-atom catalysts (SACs) combine the benefits of both heterogeneous and homogeneous catalysts, they have emerged as the frontier in advanced oxidation processes (AOPs). The isolated active metal centers of carbon-based single-metal atom catalysts can be utilized to the maximum extent. They have recently gained popularity in the realm of environmental catalysis because of their high activity, selectivity, and structural/chemical stability. Nitrogen-doped carbon-based Single-atom Fe catalysts (Fe-SACs) have a high density of the active site, low metal leaching rate and good catalytic performance, and thus have attracted the attention of researchers. However, there seems to be a lack of thorough and critical reviews on the use of carbon-based Fe-SACs for AOPs degradation of organic water pollution. In this review, we focused on the Fe-SACs made of carbon-based materials and their synthesis methods and physical characteristics. We also investigated at how Fe-SACs were used to effectively eliminate contaminants in different AOPs. In addition, the degradation mechanisms and stability of carbon-based Fe-SACs have been discussed. Finally, the advantages of carbon-based Fe-SACs in the catalytic degradation of pollutants are summarized, and the future opportunities and prospects of carbon-based Fe-SACs in the catalytic field are proposed.

关键词： Single-atom Fe Carbon-based Environmental catalysis Advanced oxidation processes Organic pollutants

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Tunable schiff-based networks with different bonding sites for enhanced photocatalytic activity under visible-light irradiation: The effects of steric hindrance

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Environmental research 2024年 246卷 118200页

作者： Han Wang Piao Xu Eydhah Almatrafi Ziwei Wang Chengyun Zhou Ting Xiong Hong Qin Yangzhuo He Hailan Yang Zhuotong Zeng Guangming Zeng School of Metallurgy and Environment Central South University Changsha 410083 China Department of Dermatology Second Xiangya Hospital Central South University Changsha 410011 China College of Environmental Science and Engineering and Key Laboratory of Environmental Biology and Pollution Control (Ministry of Education) Hunan University Changsha 410082 China Center of Research Excellence in Renewable Energy and Power Systems Center of Excellence in Desalination Technology Department of Mechanical Engineering King Abdulaziz University Jeddah 21589 Saudi Arabia. College of Environmental Science and Engineering and Key Laboratory of Environmental Biology and Pollution Control (Ministry of Education) Hunan University Changsha 410082 China. Institute of Big Data and Internet Innovation Hunan University of Technology and Business Changsha 410205 China. Center of Research Excellence in Renewable Energy and Power Systems Center of Excellence in Desalination Technology Department of Mechanical Engineering King Abdulaziz University Jeddah 21589 Saudi Arabia. Electronic address: zgming@***.

Organic polymers hold great potential in photocatalysis considering their low cost, structural tailorability, and well-controlled degree of conjugation for efficient electron transfer. Among the polymers, Schiff base networks (SNWs) with high nitrogen content have been noticed. Herein, a series of SNWs is synthesized based on the melamine units and dialdehydes with different bonding sites. The chemical and structural variation caused by steric hindrance as well as the related photoelectric properties of the SNW samples are investigated, along with the application exploration on photocatalytic degradation and energy production. The results demonstrate that only SNW-o based on o-phthalaldehyde responds to visible light, which extends to over 550 nm. SNW-o shows the highest tetracycline degradation rate of 0.02516 min, under 60-min visible light irradiation. Moreover, the HO production of SNW-o is 2.14 times higher than that of g-CN. The enhanced photocatalytic activity could be ascribed to the enlarged visible light adsorption and intramolecular electron transfer. This study indicates the possibility to regulate the optical and electrical properties of organic photocatalysts on a molecular level, providing an effective strategy for rational supramolecular engineering to the applications of organic materials in photocatalysis.

关键词： H(2)O(2) production Photocatalytic degradation Schiff-based networks Steric hindrance Structure tunability

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