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Cobalt doping amount determines dominant reactive species in peroxymonosulfate activation via porous carbon catalysts co-doped by cobalt and nitrogen

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Journal of Environmental Sciences 2024年第4期138卷 212-226页

作者： Xiang Li Limeng wu Aiqin Zhang shaohua wu Yan Lin Chunping Yang Key Laboratory of Jiangxi Province for Persistent Pollutants Control and Resources Recycle Nanchang Hangkong UniversityNanchang 330063China Academy of Environmental and Resource Sciences School of Environmental Science and EngineeringGuangdong University of Petrochemical TechnologyMaoming 525000China College of Environmental Science and Engineering Hunan University and Key Laboratory of Environmental Biology and Pollution Control(Hunan University)Ministry of EducationChangsha 410082China

Switching the reaction routes in peroxymonosulfate(PMS)-based advanced oxidation processes have attracted much attention but remain challenging.Herein,a series of Co-N/C catalysts with different compositions and structures were prepared by using bimetallic zeolitic imidazolate frameworks based on ZIF-8 and ZIF-67(x Zn/Co-ZIFs).Results show that Co doping amount could mediate the transformation of the activation pathway of PMS over CoN/C.When Co doping amount was less than 10%,the constructed x Co-N/C/PMS system(x≤10%)was singlet oxygen-dominated reaction;however further increasing Co doping amount would lead to the generation and coexistence of sulfate radicals and high-valent cobalt,besides singlet oxygen.Furthermore,the nitrogen-coordinated Co(Co-NX)sites could serve as main catalytically active sites to generate singlet oxygen.While excess Co doping amount caused the formation of Co nanoparticles from which leached Co ions were responsible for the generation of sulfate radicals and high-valent cobalt.Compared to undoped N/C,Co doping could significantly enhance the catalytic performance.The 0.5%Co-N/C could achieve the optimum degradation(0.488 min^(-1))and mineralization abilities(78.4%)of sulfamethoxazole among the investigated Co-N/C catalysts,which was superior to most of previously reported catalysts.In addition,the application prospects of the two systems in different environmental scenarios(pH,inorganic anions and natural organic matter)were assessed and showed different degradation behaviors.This study provides a strategy to regulate the reactive species in PMS-based advanced oxidation process.

关键词： Peroxymonosulfate Sulfate radical Singlet oxygen Cobalt Zeolitic imidazolate framework Advanced oxidation process

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Efficient degradation of tetracycline by singlet oxygen-dominated peroxymonosulfate activation with magnetic nitrogen-doped porous carbon

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Journal of Environmental Sciences 2022年第5期34卷 330-340页

作者： shaohua wu Chunping Yang Yan Lin Jay J.Cheng Guangdong Provincial Key Laboratory of Petrochemcial Pollution Processes and Control School of Environmental Science and EngineeringGuangdong University of Petrochemical TechnologyMaomingGuangdong 525000China College of Environmental Science and Engineering Hunan University and Key Laboratory of Environmental Biology and Pollution Control(Hunan University)Ministry of EducationChangshaHunan 410082China Maoming Engineering Research Center for Organic Pollution Control Academy of Environmental and Resource SciencesGuangdong University of Petrochemical TechnologyMaomingGuangdong 525000China Hunan Provincial Environmental Protection Engineering Center for Organic Pollution Control of Urban Water and Wastewater ChangshaHunan 410001China Department of Biological and Agricultural Engineering North Carolina State UniversityRaleighNC 27695USA

Nonradical reaction driven by peroxymonosulfate(PMS)based advanced oxidation pro-cesses has drawn widespread attention in water treatment due to their inherent advantages,but the degradation behavior and mechanism of organic pollutants are still unclear.In this study,the performance,intermediates,mechanism and toxicity of tetracycline(TC)degra-dation were thoroughly examined in the constructed magnetic nitrogen-doped porous car-bon/peroxymonosulfate(Co-N/C-PMS)system.The results showed that 85.4%of TC could be removed within 15 min when Co-N/C and PMS was simultaneously added and the degra-dation rate was enhanced by 3.4 and 14.7 folds compared with Co-N/C or PMS alone,re-spectively.Moreover,the performance of Co-N/C was superior to that of most previously reported catalysts.Many lines of evidence indicated that Co-N/C-PMS system was a singlet oxygen-dominated nonradical reaction,which was less interfered by pH and water compo-nents,and displayed high adaptability to actual water bodies.Subsequently,the degrada-tion process was elaborated on the basis of three-dimensional excitation-emission matrix spectra and liquid chromatography-mass spectrometry.At last,the toxicity of treated TC was greatly reduced by using microalgae Coelastrella sp.as ecological indicator.This study provides a promising approach based on singlet oxygen-dominated nonradical reaction for eliminating TC in water treatment.

关键词： Tetracycline Peroxymonosulfate Activation Singlet oxygen Toxicity

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CS-LTP-Spinal: a cross-layer optimized rate-adaptive image transmission system for deep-space exploration

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Science China(Information Sciences) 2022年第1期65卷 218-233页

作者： shaohua wu Dongqing LI Jian JIAO Qinyu ZHANG School of Electronics and Information Engineering Harbin Institute of Technology (Shenzhen)

Reliable and efficient image transmission is crucial for deep-space exploration. However, the extremely long distance and complex deep-space environment introduce severe design and implementation challenges. In this work, we propose a novel high-efficiency system, CS-LTP-Spinal, to address the challenges encountered in deep-space image transmission. CS-LTP-Spinal is designed to work over the Licklider transmission protocol(LTP) of the delay-tolerant network(DTN). By incorporating compressed sensing(CS)and the Spinal codes as the application and physical layer techniques, CS-LTP-Spinal can satisfy the constraints originating from resource asymmetry between the space vehicles and the ground station. To match the time-varying deep-space channels, two coarse-grained rate-adaptive transmission strategies are designed that employ different CS decompression mechanisms based on erasure-tolerant and error-tolerant decompression, respectively, to exploit the robustness of CS reconstruction to erasures and errors. Then, the rates of CS compression and Spinal coding are optimized over the application, transport, and physical layers. A semi-physical deep-space communication platform is built, and extensive simulations on the Mars-to-Earth scenario are conducted. The results demonstrate that the designed CS-LTP-Spinal system with cross-layer optimized rate-adaptive transmission strategies has significant performance advantages over its counterparts by achieving near-ideal image transmission efficiency.

关键词： deep-space image transmission CS-LTP-Spinal rate-adaptive cross-layer optimization semi-physical simulation

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Joint channel estimation and beam selection NOMA system for satellite-based Internet of Things

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Science China(Information Sciences) 2022年第10期65卷 270-284页

作者： Zeqiong CHEN Jian JIAO shaohua wu Qinyu ZHANG Communication Engineering Research Centre Harbin Institute of Technology (Shenzhen) Peng Cheng Laboratory

Multibeam low earth orbit(LEO) millimeter wave(mm Wave) band high throughput satellite(HTS) is regarded as a key component in the upcoming satellite-based Internet of Things(S-Io T). The multibeam LEO HTS with non-orthogonal multiple access(NOMA) can support global coverage and low latency broadband access over a wide geographical area in a cost-efficient manner. However, the performance is constrained by the channel state information and subsequent beam selection in multibeam LEO HTS.We design a joint channel estimation and beam selection NOMA system for S-Io T in this paper, including the pseudo random ergodic(PRE)-throughput maximum(TM) scheme for massive multiple access, and the asynchronous CSI-assisted(AIA)-TM scheme for high throughput services. Moreover, we propose the PREfairness guaranteed(FG) and AIA-FG schemes for achieving better fairness with slightly loss of throughput.Simulation results show that the PRE-TM and AIA-TM schemes can adaptively reduce the required channel measurements, while approaching the optimal system throughput performance of the exhaust searching(ES)scheme with a much lower computational complexity.

关键词： satellite-based Internet of Things non-orthogonal multiple access channel estimation system throughput fairness

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Boosting the direct conversion of NH4HCO3 electrolyte to syngas on Ag/Zn zeolitic imidazolate framework derived nitrogen-carbon skeleton

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化学科学与工程前沿:英文版 2023年第9期17卷 1196-1207页

作者： Huiyi Li Jianmin Gao Jingjing Shan Qian Du Yu Zhang Xin Guo shaohua wu Zhijiang Wang Institute of Combustion Engineering School of Energy Science and EngineeringHarbin Institute of TechnologyHarbin150001China MIIT Key Laboratory of Critical Materials Technology for New Energy Conversion and Storage School of Chemistry and Chemical EngineeringHarbin Institute of TechnologyHarbin150001China Harbin Bolier Co. Ltd.Harbin150040China Department of Environmental Engineering Shanxi UniversityTaiyuan030006China

The electrochemical reduction of NH4HCO3 to syngas can bypass the high energy consumption of high-purity CO_(2)release and compression after the ammonia-based CO_(2)capture process.This technology has broad prospects in industrial applications and carbon neutrality.A zeolitic imidazolate framework-8 precursor was introduced with different Ag contents via colloid chemical synthesis.This material was carbonized at 1000℃to obtain AgZn zeolitic imidazolate framework derived nitrogen carbon catalysts,which were used for the first time for boosting the direct conversion of NH4HCO3 electrolyte to syngas.The AgZn zeolitic imidazolate framework derived nitrogen carbon catalyst with a Ag/Zn ratio of 0.5:1 achieved the highest CO Faradaic efficiency of 52.0%with a current density of 1.15 mA·cm^(−2)at−0.5 V,a H2/CO ratio of 1-2(−0.5 to−0.7 V),and a stable catalytic activity of more than 6 h.Its activity is comparable to that of the CO_(2)-saturated NH4HCO3 electrolyte.The highly discrete Ag-N_(x)and Zn-N_(x)nodes may have combined catalytic effects in the catalysts synthesized by appropriate Ag doping and sufficient carbonization.These nodes could increase active sites of catalysts,which is conducive to the transport and adsorption of reactant CO_(2)and the stability of*COOH intermediate,thus can improve the selectivity and catalytic activity of CO.

关键词： Ag catalyst zeolitic imidazolate framework CO_(2)electroreduction ammonium bicarbonate electrolyte syngas

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Molecular mechanisms of isoflavone puerarin against cardiovascular diseases:What we know and where we go

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Chinese Herbal Medicines 2022年第2期14卷 234-243页

作者： Weida Qin Jianghong Guo Wenfeng Gou shaohua wu Na Guo Yuping Zhao Wenbin Hou Tianjin Key Laboratory of Radiation Medicine and Molecular Nuclear Medicine Institute of Radiation MedicinePeking Union Medical College&Chinese Academy of Medical SciencesTianjin 300192China Tianjin University of Traditional Chinese Medicine Tianjin 301617China State Key Laboratory Breeding Base of Dao-di Herbs National Resource Center for Chinese Materia MedicaChina Academy of Chinese Medical SciencesBeijing 100700China

Puerarin(Pue),known as a phytoestrogen,has salient bioactivities and is promising against cardiovascular diseases.This article summarizes the underlying molecular mechanisms of Pue in treating cardiovascular diseases,especially regulating the intracellular signal transduction,influencing ion channels,modulating the expression of micro RNA,and impacting on the autophagy,which are mainly involved in the inflammatory signaling pathways,fatty acid/lipid metabolism,oxidative stress,apoptosis,and the like.The protective effect of Pue against cardiovascular diseases mainly involves attenuating the myocardial injury and decreasing the myocardial fibrosis,improving the myocardial ischemia/reperfusion injury,as well as inhibiting the myocardial hypertrophy and atherosclerosis.The molecular mechanisms of Pue’s cardiovascular protective effects for the first time and comment on the state-of-the-art research methods and principles of Pue’s regulation of small molecules were reviewed,so as to provide the rationale for its basic research and clinical applications.

关键词： cardiovascular disease molecular mechanism puerarin signaling pathways

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Construction of mesoporous ceria-supported gold catalysts with rich oxygen vacancies for efficient CO oxidation

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Journal of Rare Earths 2022年第3期40卷 434-442,I0003页

作者： Xin Shen Wang Li Shunmin Ding Xiaohua Ma shaohua wu Weiming Xiao Rong Zeng Sanguo Hong Chao Chen Key Laboratory of Jiangxi Province for Environment and Energy Catalysis College of ChemistryNanchang UniversityNanchang 330031China Jiangxi Province Key Laboratory of Polymer Micro/Nano Manufacturing and Devices School of ChemistryBiology and Materials ScienceEast China University of TechnologyNanchang 330013China

Bearing unique redox nature and high oxygen storage capacity,ceria(CeO_(2))has always been a promising CO oxidation catalyst support for gold(Au)catalysts and the like.Herein,a series of Au-CeO_(2)-P(P stands for pH value)samples was prepared by a co-precipitation method with the assistance of an alkaline environment and amino groups functionalized ordered mesoporous polymer(OMP-NH_(2)).Afterward,all samples described above were characterized that the Au-CeO_(2)-P catalysts are made of Au-Ce-O solid solution and Au nanoparticles(NPs)supported on CeO_(2).It turns out that OMP-NH_(2) is not just a simple sacrificial template for mesoporous structure,but also plays an important role as an amino source,explaining the presence of rich oxygen vacancies.Due to the concentration of oxygen vacancies in Au-Ce-O solid solution is the key factor for the oxygen mobility of CO oxidation,the catalytic results also demonstrate that the catalytic activity of Au-CeO_(2)-P catalysts is related to the concentration of their oxygen vacancies.Moreover,Au-CeO_(2)-9.6 with a highest concentration of oxygen vacancies(as high as 13.98%)in Au-CeO_(2)-P catalysts exhibits the best catalytic activity(complete conversion at 10℃).

关键词： Ceria Oxygen vacancies Au-Ce-O solid Solution Amino groups functionalized ordered mesoporous polymer CO oxidation Rare earths

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Multi-Resources Management in 6G-Oriented Terrestrial-Satellite Network

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China Communications 2021年第9期18卷 24-36页

作者： Shu Fu Bibo wu shaohua wu Fang Fang College of Microelectronics and Communication Engineering Chongqing UniversityChongqing 400044China Chongqing Key Laboratory of Space Information Network and Intelligent Information Fusion Chongqing UniversityChongqing 400044China Communication Engineering Research Centre Harbin Institute of Technology(Shenzhen)Guangdong 518055China Peng Cheng Laboratory Shenzhen 518055China Department of Engineering Durham UniversityDurham DH13LEU.K

The six-generation(6G)wireless network is expected to satisfy the requirements of ubiquitous connectivity and intelligent endogenous.Terrestrialsatellite networks(TSN)enable seamless coverage for terrestrial users in a wide area,making it very promising in 6G.As data traffic in TSNs surges,the integrated management for caching,computing,and communication(3C)has attracted much research attention.In this paper,we investigate the multi-resource management in the uplink and downlink transmission of TSN,respectively.In particularly,we aim to guarantee both throughput fairness and data security in the uplink transmission of TSN.Considering the intermittent communication of the satellite,we introduce two kinds of relays,i.e.,terrestrial relays(TRs)and aerial relays(ARs)to improve the system throughput performance in the downlink transmission of TSN.Finally,we study a specific case of TSN with the uplink and downlink transmission,and the corresponding simulation results validate the effectiveness of our proposed schemes.

关键词： downlink transmission multi-resource management relay terrestrial-satellite networks up-link transmission

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2021年北极典型平流层爆发性增温事件研究与预报

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大气科学 2024年第3期48卷 1012-1026页

作者：吴少华牛迎丽谢飞北京师范大学全球变化与地球系统科学研究院北京100875

本文选取了对我国2021年冬季寒潮事件可能有重要影响的2021年1月北半球平流层爆发性增温(SSW)事件为例,利用观测资料、再分析资料和预报模式,探讨了2021年1月的SSW事件的特征和机制并对其进行了预报研究。此次SSW事件(简称为“事件”)... 详细信息

本文选取了对我国2021年冬季寒潮事件可能有重要影响的2021年1月北半球平流层爆发性增温(SSW)事件为例,利用观测资料、再分析资料和预报模式,探讨了2021年1月的SSW事件的特征和机制并对其进行了预报研究。此次SSW事件(简称为“事件”)发生期间,北极平流层温度几天内上升近30°C,绕极西风环流减弱甚至在此次事件中出现了三次逆转为东风环流的现象。事件发生前期,太平洋海温和巴伦支—喀拉海(BK)海冰的出现异常的降低和减少现象;使用Eliassen-Palm通量(E-P通量)研究发现,这导致更多的对流层异常行星波活动上传到平流层;海温和海冰所导致的行星波活动的异常增多可能是导致此次SSW事件的主要因素。除此之外还发现,事件期间平流层位势高度正异常下传到对流层,与2021年1月中旬亚欧大陆出现的极端低温事件,存在显著的联系。最后,本文使用基于WACCM6模式和DART同化工具建立的平流层预报模型对此次事件进行了回报研究。该模型成功的预报了2021年1月发生的这次SSW事件,预报的温度大小和纬向风强度基本和观测结果一致。对回报试验的进一步研究发现,同化平流层温度、臭氧和水汽,减少预报初始场中平流层环流和温度误差,对准确预报这次SSW事件有重要的作用。初始场中没有同化平流层温度、臭氧和水汽的预报试验结果,与观测结果之间存在很大差异,甚至结果完全相反。

关键词：平流层爆发性增温 E-P(Eliassen-Palm)通量行星波活动平流层同化平流层预报

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Application of Bayesian Compressive Sensing in IR-UWB Channel Estimation

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China Communications 2017年第5期14卷 30-37页

作者： Song Liu shaohua wu Yang Li Harbin Institute of Technology Shenzhen Graduate School Shenzhen 518055China

Due to the sparse nature of the impulse radio ultra-wideband(IR-UWB)communication channel in the time domain,compressive sensing(CS)theory is very suitable for the sparse channel estimation. Besides the sparse nature,the IR-UWB channel has shown more features which can be taken into account in the channel estimation process,such as the clustering structures. In this paper,by taking advantage of the clustering features of the channel,a novel IR-UWB channel estimation scheme based on the Bayesian compressive sensing(BCS)framework is proposed,in which the sparse degree of the channel impulse response is not required. Extensive simulation results show that the proposed channel estimation scheme has obvious advantages over the traditional scheme,and the final demodulation performance,in terms of Bit Error Rate(BER),is therefore greatly improved.

关键词： cluster Bayesian compressive sensing ultra wideband channel estimation

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