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Preparation of activated carbon from sunflower straw through H_(3)PO_(4) activation and its application for acid fuchsin dy. adsorption

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Water Science and Engineering 2023年第2期16卷 192-202页

作者： Wen-de zhao Li-ping Chen y.n jiao College of Chemistry.and Environmental Science Inner Mongolia Normal UniversityHohhot 010022China Inner Mongolia Key.Laboratory.of Environmental Chemistry Hohhot 010022China

With the development circular economy. the use of agricultural waste to prepare biomass materials to remove pollutants has become a research hotspot. In this study. sunflower straw activated carbon (SSAC) was prepared by.the one-step activation method, with sunflower straw (SS) used as the raw material and H3PO4 used as the activator. Four ty.es of SSAC were prepared with impregnation ratios (weight of SS to weight of H3PO4) of 1:1, 1:2, 1:3, and 1:5, corresponding to SSAC1, SSAC2, SSAC3, and SSAC4, respectively. The adsorption process of acid fuchsin (AF) in water using the four ty.es of SSAC was studied. The results showed that the impregnation ratio significantly.affected the structure of the materials. The increase in the impregnation ratio increased the specific surface area and pore volume of SSAC and improved the adsorption capacity.of AF. However, an impregnation ratio that was too large led to a decrease in specific surface area. SSAC3, with an impregnation ratio of 1:3, had the largest specific surface area (1 794.01 m2/g), and SSAC4, with an impregnation ratio of 1:5, exhibited the smallest microporosity.(0.052 7 cm3/g) and the largest pore volume (2.549 cm3/g). The adsorption kinetics of AF using the four ty.es of SSAC agreed with the quasi-second-order adsorption kinetic model. The Langmuir isotherm model was suitable to describe SSAC3 and SSAC4, and the Freundlich isotherm model was appropriate to describe SSAC1 and SSAC2. The result of thermody.amics showed that the adsorption process was spontaneous and endothermic. At 303 K, SSAC4 showed a removal rate of 97.73% for 200-mg/L AF with a maximum adsorption capacity.of 2 763.36 mg/g, the highest among the four ty.es of SSAC. This study.showed that SAAC prepared by.the H3PO4-based one-step activation method is a green and efficient carbon material and has significant application potential for the treatment of dy.-containing wastewater.

关键词： Acid fuchsin Activated carbon Adsorption Sunflower straw Phosphoric acid activation Impregnation ratio

TCL: a taxi trajectory.prediction model combining time and space features

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The Journal of China Universities of Posts and Telecommunications 2021年第3期28卷 63-75页

作者： jiao Jichao Chen Xinping Guan Meng zhao y.xin School of Electronic Engineering Beijing University of Posts and TelecommunicationsBeijing 100876China

Vehicle trajectory.modeling is an important foundation for urban intelligent services. Trajectory.prediction of cars is a hot topic. A model including convolutional neural network(CNN) and long short-term memory.LSTM) was proposed, which is named trajectory.CNN-LSTM(TCL). CNN can extract the spatial features of the trajectory.in the input image. Besides, LSTM can extract the time-series features of the input trajectory. After that, the model uses fully.connected lay.rs to merge the two features for the final predicting. The experiments on the Porto dataset of The European Conference on Machine Learning and Principles and Practice of Knowledge Discovery.in Databases(ECML-PKDD) show that the average prediction error of TCL is reduced by.0.15 km, 0.42 km, and 0.39 km compared to the trajectory.convolution(T-CONV), multi-lay.r perceptron(MLP), and recurrent neural network(RNN) model, respectively.

关键词： global navigation satellite sy.tem(GNSS) trajectory.data trajectory.prediction spatilal features time features

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Insight study.of rare earth elements in PM_(2.5)during five y.ars in a Chinese inland city.Composition

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Journal of Environmental Sciences 2024年第4期138卷 439-449页

作者： y.-Wen Shen Chang-Xian zhao Hao zhao Shuo-Fei Dong Qi Guo jiao-jiao Xie Mei-Ling Lv Chun-Gang y.an Hebei Key.Lab of Power Plant Flue Gas Multi-Pollutants Control Department ofEnvironmental Science&EngineeringNorth China Electric Power UniversityBaoding 071000China MOE Key.Laboratory.of Resources and Environmental Sy.tems Optimization College of Environmental Science and EngineeringNorth China Electric Power UniversityBeijing 102206China Agilent Technologies Co.Ltd.(China) Beijing 100102China

The booming development of rare earth industry.and the extensive utilization of its products accompanied by.urban development have led to the accelerated accumulation of rare earth elements(REEs)as emerging pollutants in atmospheric *** this study.the variation of REEs in PM_(2.5)with urban(a non-mining city.transformation was investigated through five consecutive y.ars of sample *** compositional variability.and provenance contribution of REEs in PM_(2.5)were characterized,and the REEs exposure risks of children and adults via inhalation,ingestion and dermal absorption were also *** results showed an increase in the total REEs concentration from 46.46±35.16 mg/kg(2017)to 81.22±38.98 mg/kg(2021)over the five-y.ar period,with Ce and La making the largest *** actual increment of industrial and traffic emission source among the three pollution sources was 1.34 ng/m^(3).Coal combustion source display.d a downward *** was the main exposure pathway.for REEs in PM_(2.5)for both children and *** contributed the most to the total intake of REEs in PM_(2.5)among the population,followed by.La and *** exposure risks of REEs in PM_(2.5)in the region were relatively.low,but the trend of change was of great *** was strongly.recommended to strengthen the concern about traffic-related non-exhaust emissions of particulate matter.

关键词： Rare earth elements Exposure risks Pollution sources Traffic-related non-exhaust emissions

Self-standing 3D nanoporous Ag_(2)Al with abundant surface oxy.en species facilitating oxy.en electroreduction for efficient hy.rid Zn battery

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Journal of Energy.Chemistry 2021年第7期30卷 345-354页

作者： Ming Peng y.ng zhao jiao Lan y.jin Qiao y.ngwen Tan College of Materials Science and Engineering Hunan UniversityChangsha 410082HunanChina

The hy.rid battery.integrating a ty.ical Zn redox battery.and a Zn-air battery.is a promising green technology.for energy.storage,and the cathode integrating the redox reaction and electrocataly.ic oxy.en reduction is a key.point for efficient electrochemical energy.***,we report a scalable strategy.to fabricate nanoporous Ag2 Al internetallic compound as a self-standing cathode for the hy.rid Zn *** abundant surface oxy.en species,the Ag-Al intermetallic interaction and the npAg_(2)Al@AgAlOx interface cooperatively.contributed to the cataly.ic ORR *** electrode endows efficient cataly.ic oxy.en reduction(a Tafel slope of 38.0 mV/dec and an onset potential of 0.998 V)and regulated redox activity.as compared with *** nanoporous channels allow efficient ion transport,interface charge exchange and gas molecular ***,the assembled hy.rid Zn-Ag_(2) Al/air battery.delivers a high capacity.of 3.23 mAh/cm^(2) as compared with recent *** far as we know,this is the first exploration for the electrochemical property.of Ag2 Al,and it would inspire more exploration in developing multifunctional materials and robust hy.rid batteries for practical applications.

关键词： Nanoporous metal Ag_(2)Al Oxy.en reduction Intermetallic interaction Hy.rid battery

Preparation,Mechanical and Biological Properties of Inkjet Printed Alginate/Gelatin Hy.rogel

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Journal of Bionic Engineering 2021年第3期18卷 574-583页

作者： Tian jiao Qin Lian Tingze zhao Huichao Wang Dichen Li State Key.Laboratory.for Manufacturing Sy.tem Engineering Xi'an Jiaotong UniversityXi'an 710049China

3D printing has made remarkable progress in soft tissue reconstruction enabling the custom design of complex material implants with patient specific *** aim of this study.was to inkjet print mechanically.reinforced biocompatible ***,we developed a double crosslinked ink by.optimizing the rheological properties of solutions of sodium alginate(NaAlg),NaAlg/transglutaminase(TG),CaCl_(2)and gelatin/CaCl_(2).The results showed that a two-component ink sy.tem comprising NaAlg(4%w/v)/TG(0.8%w/v)and gelatin(4%w/v)/CaCl_(2)(3%w/v)gave optimum *** mechanical and biological properties of printed alginate/gelatin hy.rogels prepared from inks with different gelatin contents,and incorporated fibroblasts,were characterized by.Scanning Electron Microscope(SEM),mechanical testing and laser confocal *** compressive moduli of alginate/gelatin hy.rogels could be adjusted from 19.2 kPa±1.2 kPa to 65.9 kPa±3.3 kPa by.increasing the content of *** incubation for 7 d,fibroblasts had permeated all printed hy.rogels and the rate of proliferation increased with increasing gelatin *** highest cell proliferation rate(497%)was obtained in a hy.rogel containing 4.5%(w/v)*** study.offers a new strategy.for the fabrication of 3D structures used to mimic the function of native tissues.

关键词： biofabrication inkjet printing double crosslinking ink mechanical and biological properties hy.rogel preparation

Application of improved active disturbance rejection control algorithm in tilt quad rotor

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Chinese Journal of Aeronautics 2020年第6期33卷 1625-1641页

作者： Zhigang WANG Hong zhao Dengy.n DUAN y.any.ng jiao Jianbo LI National Key.Laboratory.of Rotorcraft Aeromechanics Nanjing University of Aeronautics and AstronauticsNanjing 210016 China

The Tilt Quad Rotor(TQR) has complex dy.amics characteristics, especially.in conversion mode. It is difficult to build the dy.amic model of the TQR and the environmental factors have a great influence on it. To solve the problem of control in conversion mode of TQR, this paper carries out the design of the controller based on improved Active Disturbance Rejection Control(ADRC). According to the characteristics of flight in conversion mode, Tracking Differentiator(TD) with explicit model is used to solve the problem of multiple integrals when the sy.tem is high-order sy.tem. Extended State Observer(ESO) with Radial Basis Function(RBF) neural network is used to estimate and compensate for internal and external uncertainties, and the adaptive sliding mode control in Nonlinear State Error Feedback(NLSEF) is used to improve the response speed of the controller and reduce the parameters which should be tuned. Through the flight control simulation of the TQR, the validity.and rationality.of the control sy.tem are verified.

关键词： Active disturbance rejection control Adaptive sliding mode control Explicit model Radial basis function neural network Tilt quad rotor

Achieving efficient N_(2)electrochemical reduction by.stabilizing the N2H*intermediate with the frustrated Lewis pairs

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Journal of Energy.Chemistry 2022年第3期31卷 628-634,I0017页

作者： Zhe Chen Jingxiang zhao y.n jiao Tao Wang Lichang y.n Sheny.ng National Laboratory.for Materials Science Institute of Metal ResearchChinese Academy of SciencesShenyang 110016LiaoningChina Center of Artificial Photosy.thesis for Solar Fuels School of ScienceWestlake UniversityHangzhou 310024ZhejiangChina College of Chemistry.and Chemical Engineering and Key Laboratory of Photonic and Electronic Bandgap MaterialsMinistry of EducationHarbin Normal UniversityHarbin 150025HeilongjiangChina Centre for Materials in Energy.and Cataly.is(CMEC) School of Chemical Engineering and Advanced MaterialsThe University of AdelaideAdelaideSA5005Australia Department of Phy.ics and Electronic Information Huaibei Normal UniversityHuaibei 235000AnhuiChina

Electrocataly.ic nitrogen reduction reaction(eNRR)with sustainable energy.under ambient conditions represents an attractive approach to producing ammonia,but the design of the-state-of-the-art electrocataly.t with high efficiency.and selectivity.still faces formidable *** contrast to traditional eNRR cataly.t design strategies focusing on N≡N triple bond activation,we herein theoretically.proposed an alternative strategy.to improve eNRR performance via stabilizing the N_(2)H^(*)intermediate using cataly.ts with the frustrated Lewis pairs(FLPs),i.e.,transition metal(TM)atoms and boron(B)atom co-doped 2D black phosphorus(TM-B@BP).Our density.functional theory.DFT)results reveal that the TM atom donates electrons to the adsorbed N_(2)molecule,while B atom provides empty.orbital to stabilize the adsorption of N_(2)H^(*)*** framework successfully.identifies five promising candidates(i.e.,Ti-B@BP,V-B@BP,Cr-B@BP,Mn-B@BP and Fe-B@BP)with low theoretical limiting potentials(−0.60,−0.41,−0.45,−0.43 and−0.50 V,respectively.and high selectivity.for *** believe that the intermediate stabilization strategy.introduced in current work offers a new opportunity.to achieve accelerated and cost-effective ammonia sy.thesis with electrocataly.is.

关键词： Nitrogen reduction Electrocataly.is Intermediate stabilization strategy Density.functional theory

A review of in-situ high-temperature characterizations for understanding the processes in metallurgical engineering

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International Journal of Minerals,Metallurgy.and Materials 2024年第11期31卷 2327-2344页

作者： y.fan zhao Zhiy.an Li Shijie Li Weili Song Shuqiang jiao Institute of Advanced Structure Technology Beijing Institute of TechnologyBeijing 100081China State Key.Laboratory.of Advanced Metallurgy University of Science and Technology BeijingBeijing 100083China

For the rational manipulation of the production quality.of high-temperature metallurgical engineering,there are many.challenges in understanding the processes involved because of the black box chemical/electrochemical *** overcome this issue,various in-situ characterization methods have been recently.developed to analy.e the interactions between the composition,microstructure,and solid-liquid interface of high-temperature electrochemical electrodes and molten *** this review,recent progress of in-situ hightemperature characterization techniques is discussed to summarize the advances in understanding the processes in metallurgical ***-situ high-temperature technologies and analy.ical methods mainly.include sy.chrotron X-ray.diffraction(s-XRD),laser scanning confocal microscopy.and X-ray.computed microtomography.X-ray.-CT),which are important platforms for analy.ing the structure and morphology.of the electrodes to reveal the complexity.and variability.of their *** addition,laser-induced breakdown spectroscopy.high-temperature Raman spectroscopy.and ultraviolet-visible absorption spectroscopy.provide microscale characterizations of the composition and structure of molten *** importantly.the combination of X-ray.-CT and s-XRD techniques enables the investigation of the chemical reaction mechanisms at the two-phase ***,these in-situ methods are essential for analy.ing the chemical/electrochemical kinetics of high-temperature reaction processes and establishing the theoretical principles for the efficient and stable operation of chemical/electrochemical metallurgical processes.

关键词： in-situ characterization methods high-temperature electrochemistry electrodes molten salts interfacial reaction

Regulation of substrate surface topography.on differentiation of mesenchy.al stem cells

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Acta Mechanica Sinica 2020年第5期36卷 1158-1169,I0004页

作者： Bo Huo y.ng zhao Xue Bai Qing Sun Fei jiao Biomechanics Lab Department of MechanicsSchool of Aerospace EngineeringBeijing Institute of TechnologyBeijing 100081China

Mesenchy.al stem pells(MSCs)have been extensively.used in the field of tissue engineering and regenerative *** effect of surface properties on the differentiation of MSCs is a very.important issue for the design and fabrication of scaffolds or *** review is mainly.focused on the morphological or topographic characteristics of cell adhesion substrate,*** area and shape for individual cell,cell density.and cell-cell contact for multiple cells,substrate roughnessridge width,micropillar height,nanoparticle diameter and aspect ratio of *** results from different studies were quantitativcly.analy.ed using comparable or unified parameters and definitions under the specific experimental conditions such as cell source,culture time,induction medium,matrix material and differentiation *** interesting phenomena and properties were discovered by.this integrated and sy.tematic analy.is,which might give insights into the regulatory.mechanism of surface morphology.or topography.on MSCs differentiation.

关键词： Mesenchy.al stem cell Adhesion morphology Surface topography Differentiation Biomaterial