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Catalytic ozonation of NH_(4)^(+)-N in wastewater over composite metal oxide catalyst

Journal of Rare Earths 2022年第1期40卷 73-84页

作者： Caiqing He Yunnen Chen Lin Guo Ruoyu Yin Tingsheng Qiu Jiangxi key Laboratory of Mining&Metallurgy Environmental Pollution Control Jiangxi University of Science and TechnologyGanzhou 341000China

Large amounts of water containing-ammonium nitrogen(NH_(4)^(+)-N)have attracted increasing *** ozonation technology,involving the generation of hydroxyl radical(OH)with strong oxidation ability,was originally utilized to degrade organic-containing *** this paper,Ce/MnOx composite metal oxide catalysts prepared with different preparation conditions were used to degrade wastewater containing inorganic pollutant(NH_(4)^(+)-N).The as-prepared catalyst features were characterized using X-ray diffraction(XRD),Brunauer-Emmett-Teller method(BET),scanning electron microscopy(SEM),energy dispersive X-ray spectroscopy(EDS),Fourier transform infrared spectroscopy(FTIR),X-ray photoelectron spectroscopy(XPS)and H_(2)-temperature programmed reduction(H_(2)-TPR)*** results show that the catalyst,prepared by conditions with precipitant Na_(2)CO_(3) and Ce/Mn molar ratio 1:2 calcined at 400℃for 3 h in pH 11.0,displays the optimal performance,with the removal rate of NH_(4)^(+)-N and selectivity to gaseous nitrogen,88.14 wt%and 53.67 wt%,*** effects of several operating factors including solution pH,initial NH_(4)^(+)-N concentrations and scavengers were *** addition,XRD patterns of catalyst with the best performance and the comparative study on decontamination of NH_(4)^(+)-N by various processes(O_(3),catalyst and catalyst/O_(3))show that the primary metal oxides are CeO_(2) and MnO_(2) in Ce/MnOx composite metal oxide catalysts,which have a synergistic effect on the catalytic ozonation of NH_(4)^(+)-N,and the new phase MnO_(2) plays a great *** 5 consecutive use cycles,the degradation efficiency is declined slightly,and can still achieve better than 70 wt%over 1 h ***,the application of catalytic ozonation for actual wastewater on the removal rate of NH_(4)^(+)-N was *** mechanism and degradation pathway of NH_(4)^(+)-N were also *** a word,the application of CeO_(2)-MnO_(2

关键词： Ammonium nitrogen Catalyst Wastewater Catalytic ozonation Rare earths

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QAM signal with electric field sensor based on thin-film lithium niobate [Invited]

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Chinese Optics Letters 2023年第12期21卷 32-37页

作者：李廷安刘钊潘安尚成林刘永曾成夏金松 Wuhan National Laboratory for Optoelectronics Huazhong University of Science and TechnologyWuhan 430074China School of Optoelectronic Science and Engineering University of Electronic Science and Technology of ChinaChengdu 610054China

Large-bandwidth,high-sensitivity,and large dynamic range electric field sensors are gradually replacing their traditional *** lithium-niobate-on-insulator(LNOI)material has emerged as an ideal platform for developing such devices,owing to its low optical loss,high electro-optical modulation efficiency,and significant bandwidth *** this paper,we propose and demonstrate an electric field sensor based on *** sensor consists of an asymmetric Mach–Zehnder interferometer(MZI)and a tapered dipole antenna *** measured fiber-to-fiber loss is less than−6.7 dB,while the MZI structure exhibits an extinction ratio of greater than 20 ***,64-QAM signals at 2 GHz were measured,showing an error vector magnitude(EVM)of less than 8%.

关键词： thin-film lithium niobate electric field sensor QAM signal

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Characterization and application of a recombinant dopa decarboxylase from Harmonia axyridis for the efficient biosynthesis of dopamine

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Chinese Journal of Chemical Engineering 2022年第1期35卷 449-456页

作者： Siyuan Gao Yuanke Guo Chen Ma Ding Ma Kequan Chen Pingkai Ouyang Xin Wang state key Laboratory of Materials-Oriented Chemical Engineering College of Biotechnology and Pharmaceutical EngineeringNanjing Tech UniversityNanjing 211816China

Here,a dopa decarboxylase(DDC)from Harmonia axyridis was heterogeneously expressed in Escherichia coli for the efficient biosynthesis of *** the production of recombinant DDC,the cultivation conditions including IPTG concentration,temperature and induction time were optimized and obtained an optimal specific enzyme activity of 51.72 U·mg^(-1) crude *** the purification of DDC with a recovery yield of 68.79%,its activity was further *** Vmax,Km,Kcat,and Kcat/Km of DDC for d ihyd roxy pheny la la nine(dopa)were 0.02 mmol·ml^(-1)·s^(-1),2.328 mmol·ml^(-1),10435.90 s^(-1) and4482.77 ml,mmol *** highest DDC activity was observed at the condition of pH 7.5 and 45℃.With the purified DDC,the feasibility to produce dopamine from L-dopa was *** optimal yield was determined at the following bioconversion conditions:pH of 7,0,the reaction temperature of 40℃,0.4 mmol·L^(-1) of PLP and 4 g·L^(-1) of L-dopa,Subsequently,a fed-batch process for the production of dopamine was developed and the effect of oxygen was *** titer,yield and productivity of dopamine reached up to 21.99 g·L^(-1)80.88%and 14.66 g·L^(-1)·h^(-1) at 90 min under anaerobic condition.

关键词： Dopa decarboxylase Dopamine Enzyme catalysis Fed-batch bioconversion

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Epizootiological surveillance of porcine circoviruses in free-ranging wild boars in china

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Virologica Sinica 2023年第5期38卷 663-670页

作者： Wenjie Gong Haiying Du Tong Wang Heting Sun Peng Peng Siyuan Qin Haidong Geng Zheng Zeng Wangwang Liang Hongquan Ling Changchun Tu Zhongzhong Tu state key Laboratory for Diagnosis and Treatment of Severe Zoonotic Infectious Diseases Key Laboratory for Zoonosis Research of the Ministry of EducationInstitute of Zoonosisand College of Veterinary MedicineJilin UniversityChangchun130062China Changchun Veterinary research Institute Chinese Academy of Agricultural SciencesChangchun130122China Jiangsu Co-Innovation Center for the Prevention and Control of Important Animal Infectious Disease and Zoonoses Yangzhou UniversityYangzhou225009China Biological Disaster Control and Prevention Center National Forestry and Grassland AdministrationShenyang110034China Chongqing Animal Disease Prevention and Control Center Chongqing401120China

Four species of porcine circoviruses(PCV1–4)have been reported to circulate in Chinese domestic pigs,while the epizootiology of these viruses in free-ranging wild boars in china remains *** this study,tissue and serum samples collected from diseased or apparently healthy wild boars between 2018 and 2020 in 19 regions of china were tested for the prevalence of PCV1–4 *** rates of PCV1,PCV2,and PCV3 DNA in the tissue samples of Chinese wild boars were 1.6%(4/247),58.3%(144/247),and 10.9%(27/247)respectively,with none positive for *** analysis of viral genome showed that the four PCV1 strains distributed in Hunan and Inner Mongolia shared 97.5%–99.6%sequence identity with global distributed reference *** of the ORF2 gene sequences showed that 80 PCV2 strains widely distributed in 18 regions shared 79.5%–100%sequence identity with reference strains from domestic pigs and wild boars,and were grouped into PCV2a(7),PCV2b(31)and PCV2d(42).For PCV3,17 sequenced strains shared 97.2%–100%nucleotide identity at the genomic level and could be divided into PCV3a(3),PCV3b(2)and PCV3c(12)based on the phylogeny of ORF2 gene *** data revealed antibody positive rates against PCV1 and PCV2 of 11.4%(19/167)and 53.9%(90/167)*** data obtained in this study improved our understanding about the epidemiological situations of PCVs infection in free-ranging wild boars in china and will be valuable for the prevention and control of diseases caused by PCVs infection.

关键词： Porcine circoviruses(PCVs) Epizootiology Wild boar china

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Spatially explicit reconstruction of cropland cover for china over the past millennium

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Science china Earth Sciences 2023年第1期66卷 111-128页

作者： Fanneng HE Fan YANG Caishan ZHAO Shicheng LI Meijiao LI key Laboratory of Land Surface Pattern and Simulation Institute of Geographic Sciences and Natural Resources ResearchChinese Academy of SciencesBeijing 100101China key research Institute of Yellow River Civilization and Sustainable development&Collaborative Innovation Center on Yellow River Civilization Jointly Built By Henan Province and Ministry of Education Henan UniversityKaifeng 475001China University of Chinese Academy of Sciences Beijing 100049China School of Public Administration China University of GeosciencesWuhan 430074China College of Resources and Environment Shanxi University of Finance and EconomicsTaiyuan 030006China

Reconstructing historical land use and land cover change using explicit temporal,quantitative,and spatial information is not only the prerequisite for simulating long-term climate change and ecological effects but is also a scientific basis for comprehensively understanding the process and mechanism of anthropogenic land use *** changes in historical borders and administrative divisions,a provincial cropland area dataset for china over the past millennium was created on the basis of existing estimations since the Song *** suitability for cultivation was then assessed by incorporating altitude,slope,soil texture,and the maximum potential productivity of ***,a gridding allocation model for cropland was constructed,and the provincial cropland area for 24 years over the past millennium was allocated into grids with a resolution of 10 *** cropland area in china increased from 3.71×10^(7)ha in AD 1000 to 12.92×10^(7)ha in AD 1999,with a peak of 13.50×10^(7)ha in AD *** total cropland area in china showed fluctuating increasing trends that can be divided into three phases:fluctuation without notable net change for AD 1000–1290,slow increase for AD 1290–1661,and rapid increase for AD 1661–***,cropland intensified in the middle-lower reaches of the Yellow and Yangtze Rivers and expanded to mountainous and frontier areas over the last ***,over the entire period,the fractional cropland areas(FCAs)in the middle-lower reaches of the Yellow and Yangtze Rivers increased by 1.4 and 0.8 times,*** the mid-Qing Dynasty,large-scale land reclamation expanded to areas of low reclamation in southwest and northeast *** FCAs for southwest and northeast china increased from 2.13%and 0.55%in AD 1661 to 18.00%and 26.61%in AD 1999,*** AD 1661–1999,the proportion of cropland increased by 55%in the hills and low mountains and 27%in the middle and high *** comparison wit

关键词： Land use and land cover change Historical cropland Gridding reconstruction china Last millennium

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Dissolved oxygen concentration control in wastewater treatment process based on reinforcement learning

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中国科学:技术科学英文版 2023年第9期66卷 2549-2560页

作者： DU ShengLi CHEN PeiXi HAN HongGui QIAO JunFei School of Artificial Intelligence and Automation Beijing University of TechnologyBeijing 100124China Engineering research Center of Intelligent Perception and Autonomous Control Ministry of EducationBeijing 100124China Beijing Laboratory of Smart Environmental Protection Beijing 100124China

In this article, the dissolved oxygen(DO) concentration control problem in wastewater treatment process(WWTP) is *** existing control strategies that control DO concentration at a fixed value, here we develop a different control *** the proposed control framework, an intelligent control method of DO concentration based on reinforcement learning(RL)algorithm is presented to resolve the DO concentration control problem. By using the deep deterministic policy gradient(DDPG)algorithm, the DO concentration of the fifth tank in the activated sludge reactor can be adjusted dynamically. In addition, by designing two different reward functions and by analysing the relationships among effluent quality, energy consumption, and DO concentration, the target of energy-saving and emission-reducing is achieved. The simulation results indicate that the designed control method can reduce energy consumption while ensuring that the effluent quality meet the specified standards.

关键词： dissolved oxygen concentration wastewater treatment process intelligent control reinforcement learning energy-saving and emission-reducing

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A controllable fabrication improved silicon nanowire array sensor on(111)SOI for accurate bio-analysis application

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Nano research 2022年第8期15卷 7468-7475页

作者： Zicheng Lu Hong Zhou Yi Wang Yanxiang Liu Tie Li Science and Technology on Micro-system Laboratory Shanghai Institute of Microsystem and Information TechnologyChinese Academy of SciencesShanghai 200050China University of Chinese Academy of Sciences(UCAS) Beijing 100190China

Silicon nanowire field-effect transistor(SiNW-FET)sensors possess the ability of rapid response,real-time,and label-free detection with high sensitivity and selectivity in the analysis of charged *** nano-scale size makes them well suited for ultralow detection of charged molecules,but also brings the uniformity fabrication challenging,thus limiting their large-scale *** a horizontal control approach,highly controllable silicon nanowires arrays at the top of the silicon-on-insulator(SOI)wafer(T-SiNW)were developed in our previous *** further improve the device uniformity,here a novel SiNW fabricated approach was carefully designed by the combination of horizontal and vertical *** new silicon nanowires appeared at the bottom of the top silicon layer(B-SiNW).The B-SiNW has a relatively low requirement on the fabrication process and better device uniformity compared to *** improvements resulted in the B-SiNW device with a lower current fluctuation(4.1 nA with 5.1%variations)in the flowing liquid,compared to the T-SiNW device(4.4 nA with 11%variations).Further,in quantitative detection of 40 ng/mL MMP-9,the B-SiNW sensors provided larger signals and lower fluctuation(normalized average response value:0.57 with 4.2%variations),compared to the T-SiNW sensors(0.41 with 12.1%variations),thus indicating a more accurate bio-analysis application of the B-SiNW *** work advances the nanowire sensor technology a step closer toward large-scale application to create stable sensing platforms in disease diagnosis and monitoring.

关键词： silicon nanowire top-down (111)silicon-on-insulator triangular cross-section quantitative detection

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Formation mechanism and control strategy for particulate nitrate in china

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Journal of Environmental Sciences 2023年第1期123卷 476-486页

作者： Haichao Wang Keding Lu Zhaofeng Tan Xiaorui Chen Yuhan Liu Yuanhang Zhang School of Atmospheric Sciences Sun Yat-sen UniversityGuangzhou 510275China state key Joint Laboratory of Environmental Simulation and Pollution Control College of Environmental Sciences and EngineeringPeking UniversityBeijing 100871China Institute of Energy and Climate research IEK-8:TroposphereForschungszentrum Jülich GmbHJülich 52428Germany Department of Civil and Environmental Engineering The Hong Kong Polytechnic UniversityHong Kong 999077China china Institute of Atomic Energy Beijing 100193China

Over the past decade,fine particulate matter(PM)pollution in china has been abated significantly,benefiting from strict emission control measures,but particulate nitrate continues to ***,we review the progress in particulate nitrate(p NO3-)pollution characterization,nitrate formation mechanisms,and the proposed control strategies in *** spatial and temporal distributions of p NO3-are *** current status of knowledge on the chemical mechanism is updated,and the significance of its formation pathways is assessed by various approaches such as field observation and modelling of nitrate production rate,as well as isotopic *** factors impacting p NO3-formation and the corresponding pollution regulation strategies are discussed,in which the importance of atmospheric oxidation capacity and ammonia are ***,the challenges and open questions in p NO3-pollution control in china are outlined.

关键词： Particulate nitrate Reactive nitrogen Particulate matter Formation mechanism Air pollution control

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Transparent,Ultra-Stretching,Tough,Adhesive Carboxyethyl Chitin/Polyacrylamide Hydrogel Toward High-Performance Soft Electronics

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Nano-Micro Letters 2023年第1期15卷 161-182页

作者： Jipeng Zhang Yang Hu Lina Zhang Jinping Zhou Ang Lu College of Chemistry and Molecular Sciences Wuhan UniversityWuhan 430072People’s Republic of China Hubei Engineering Center of Natural Polymer-Based Medical Materials Wuhan UniversityWuhan 430072People’s Republic of China

To date,hydrogels have gained increasing attentions as a flexible conductive material in fabricating soft ***,it remains a big challenge to integrate multiple functions into one gel that can be used widely under various ***,a kind of multifunc-tional hydrogel with a combination of desirable characteristics,including remarkable transparency,high conductivity,ultra-stretchability,tough-ness,good fatigue resistance,and strong adhesive ability is presented,which was facilely fabricated through multiple noncovalent crosslinking *** resultant versatile sensors are able to detect both weak and large deformations,which owns a low detection limit of 0.1%strain,high stretchability up to 1586%,ultrahigh sensitivity with a gauge factor up to 18.54,as well as wide pressure sensing range(0-600 kPa).Meanwhile,the fabrication of conductive hydrogel-based sensors is demonstrated for various soft electronic devices,including a flexible human-machine interactive system,the soft tactile switch,an integrated electronic skin for unprecedented nonplanar visualized pressure sensing,and the stretchable triboelectric nanogenerators with excellent biomechanical energy harvesting *** work opens up a simple route for multifunctional hydrogel and promises the practical application of soft and self-powered wearable electronics in various complex scenes.

关键词： Conductive hydrogels Multifunctional sensors Human-machine interaction Electronic skin Stretchable triboelectric nanogenerators

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Phenotype and metabolism alterations in PCB-degrading Rhodococcus biphenylivorans TG9^(T) under acid stress

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Journal of Environmental Sciences 2023年第5期127卷 441-452页

作者： Aili Li Jiahui Fan Yangyang Jia Xianjin Tang Jingwen Chen Chaofeng Shen Department of Environmental Engineering College of Environmental and Resource SciencesZhejiang UniversityHangzhou 310058China MOE key Lab of Environmental Remediation and Ecosystem Health College of Environmental and Resource SciencesZhejiang UniversityHangzhou 310058China

Environmental acidification impairs microorganism diversity and their functions on substance *** is a ubiquitously distributed genus for contaminant detoxification in the environment,and it can also adapt a certain range of *** work interpreted the acid responses from both phenotype and metabolism in strain Rhodococcus biphenylivorans TG9^(T)(TG9)induced at pH *** phenotype alterations were described with the number of culturable and viable cells,intracellular ATP concentrations,cell shape and entocyte,degradation efficiency of polychlorinated biphenyl(PCB)31 and *** number of culturable cells maintained rather stable within the first 10 days,even though the other phenotypes had noticeable alterations,indicating that TG9 possesses certain capacities to survive under acid *** metabolism responses were interpreted based on transcription analyses with four treatments including log phase(LP),acid-induced(PER),early recovery after removing acid(RE)and later recovery(REL).With the overview on the expression regulations among the 4 treatments,the RE sample presented more upregulated and less downregulated genes,suggesting that its metabolism was somehow more active after recovering from acid *** addition,the response mechanism was interpreted on 10 individual metabolism pathways mainly covering protein modification,antioxidation,antipermeability,H+consumption,neutralization and ***,the transcription variations were verified with RT-qPCR on 8 genes with 24-hr,48-hr and 72-hr acid *** together,TG9 possesses comprehensive metabolism strategies defending against acid ***,a model was built to provide an integrate insight to understand the acid resistance/tolerance metabolisms in microorganisms.

关键词： Environmental acidification Rhodococcus biphenylivorans Contaminant degradation Phenotypic response Transcription analysis Metabolism pathway Mechanism model

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