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Preparation of Co/S co-doped carbon catalysts for excellent methylene blue degradation

International Journal of Minerals,Metallurgy and Materials 2025年第1期32卷 169-181页

作者： Haixu Li Haobo He Tiannan Jiang Yunfei Du Zhichen Wu Liang Xu Xinjie Wang Xiaoguang Liu Wanhua Yu Wendong Xue School of Materials Science and Engineering University of Science and Technology BeijingBeijing 100083China beijing Jinyu Tongda Refractory Technologies Co. Ltd.Beijing 100085China

S and Co co-doped carbon catalysts were prepared via pyrolysis of MOF-71 and thiourea mixtures at 800℃at a mass ratio of MOF-71 to thiourea of 1:0.1 to effectively activate peroxymonosulfate(PMS)for methylene blue(MB)*** effects of two different mixing routes were identified on the MB degradation ***,the catalyst obtained by the alcohol solvent evaporation(MOF-AEP)mixing route could degrade 95.60%MB(50 mg/L)within 4 min(degradation rate:K=0.78 min^(-1)),which was faster than that derived from the direct grinding method(MOF-DGP,80.97%,K=0.39 min^(-1)).X-ray photoelectron spectroscopy revealed that the Co-S content of MOF-AEP(43.39at%)was less than that of MOF-DGP(54.73at%),and the proportion of C-S-C in MOF-AEP(13.56at%)was higher than that of MOF-DGP(10.67at%).Density functional theory calculations revealed that the adsorption energy of Co for PMS was -2.94 eV when sulfur was doped as C-S-C on the carbon skeleton,which was higher than that when sulfur was doped next to cobalt in the form of Co-S bond(-2.86 eV).Thus,the C-S-C sites might provide more contributions to activate PMS compared with ***,the degradation parameters,including pH and MOF-AEP dosage,were ***,radical quenching experiments and electron paramagnetic resonance(EPR)measurements revealed that ^(1)O_(2)might be the primary catalytic species,whereas·O~(2-)might be the secondary one in degrading MB.

关键词： advanced oxidation process alcohol solvent evaporation hydrogen bond S and Co co-doped carbon catalysts wastewater remediation

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Orbitronics for energy-efficient magnetization switching

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Science China(Information Sciences) 2025年第1期 398-399页

作者： Yuxuan YAO Daoqian ZHU Qingtao XIA Jianing LIANG Yuhao JIANG Zhiyang PENG Jiaxu LI Chen XIAO Renyou XU Wenwen WANG Xiantao SHANG Shiyang LU Dapeng ZHU Hong-Xi LIU Kaihua CAO Weisheng ZHAO Fert beijing Institute School of Integrated Circuit Science and Engineering Beihang University National Key Lab of Spintronics Institute of International Innovation Beihang University Qingdao research Institute Beihang University Truth Memory Corporation

Spin-orbit torque （SOT）,as a promising writing method for magnetic random-access memory （MRAM）,has garnered widespread interest for over a decade [1].Heavy metals,such as β-W,have been broadly adopted as spin current sources,but suffer from phase change at a limited thickness,resulting in a dramatic reduction of the charge-tospin conversion efficiency θSH[2].The thickness limitation leads to stringent etching conditions and large distribution among devices,posing challenges for simultaneously satisfying SOT efficiency,etching-stop margins,and back-end-ofline （BEOL） compatibility.

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Liposome-based multifunctional nanoplatform as effective therapeutics for the treatment of retinoblastoma

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Acta Pharmaceutica Sinica B 2022年第6期12卷 2731-2739页

作者： Ying Liu Yu Han Shizhu Chen Jingjie Liu Dajiang Wang Yifei Huang Department of Ophthalmology Beijing Rehabilitation HospitalCapital Medical UniversityBeijing 100144China Department of Ophthalmology Chinese PLA General HospitalBeijing 100853China College of Chemistry&Environmental Science Chemical Biology Key Laboratory of Hebei ProvinceKey Laboratory of Medicinal Chemistry and Molecular Diagnosis of the Ministry of EducationHebei UniversityBaoding 071002China China Resources Pharmaceutical Group Limited Beijing 100000China

Photothermal therapy has the characteristics of minimal invasiveness,controllability,high efficiency,and strong specificity,which can effectively make up for the toxic side effects and tumor resistance caused by traditional drug ***,due to the limited tissue penetration of infrared light,it is difficult to promote and apply in clinical *** eye is the only transparent tissue in human,and infrared light can easily penetrate the eye tissue,so it is expected that photothermal therapy can be used to treat fundus *** in,a new nano-platform assembled by liposome and indocyanine green(ICG) was used to treat *** was assembled in liposomes to overcome some problems of ICG *** example,ICG is easily quenched,self-aggregating and ***,liposomes can prevent free ICG from being cleared through the systemic *** construction of the nano-platform not only ensured the stability of ICG in vivo,but also realized imaging-guide photothermal therapy,which created a new strategy for the treatment of retinoblastoma.

关键词： Nanoplatform Liposomes Retinoblastoma Imaging-guided Photothermal therapy

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Enhancing photocatalytic performance by constructing ultrafine TiO2 nanorods/g-C3N4 nanosheets heterojunction for water treatment

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Science Bulletin 2018年第11期63卷 683-690页

作者： Shiliang Luan Dan Qu Li An Wenshuai Jiang xiang Gao Shixin Hua Xiang Miao Yuanjing Wen Zaicheng Sun beijing Key Laboratory for Green Catalysis and Separation.Department of Chemistry and Chemical Engineering School of Environmental and Energy EngineeringBeijing University of TechnologyBeijing 100124China State Key Laboratory of Luminescence and Applications.Changchun Institute of Optics Fine Mechanics and PhysicsChinese Academy of Sciences.Changchun 130033China University of Chinese Academy of Sciences Beijing 100049China

Photocatalysis is considered to be a clean, green and efficient method to purify water. In this report, we first developed a highly efficient ultrafine TiO2 nanorods/g-C3N4 nanosheets （TiO2 NR/CN NS） composites via a simple hydrothermal method. Tiny TiO2 nanorods （diameter：～1.5 nm and length：～8.3 nm） were first loaded in situ on the CN NS by adding graphitic carbon nitride （g-C3N4） to the reaction solution. The TiO2 NR/CN NS composites present high charge separation efficiency and broader light absorbance than P25 TiO2. Furthermore, we illustrate that the TiO2 NR/CN NS catalyst possesses high performance for the photocatalytic degradation of the common and stubborn pollutants in water, such as the rhodamine B （RhB） dye and phenol. Under visible light （λ 〉 420 nm） irradiation, the apparent rate of the TiO2 NR/CN NR is 172 and 41 times higher than that of the P25 TiO2 and TiO2 NR, respectively. Additionally, we speculated that the heterojunction formed between TiO2 NR and CN NS, which is the basis for the experiments we have designed and the corresponding results. We demonstrated that reactive oxidative species such as superoxide anion radical and holes play critical roles in the degradation, and the hydroxyl radical contributes nothing to the degradation.

关键词： Heterojunction Photocatalyst TiO2 nanorods g-C3N4 nanosheets Water treatment

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Evaluation of the relative differences in building energy simulation results

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Building Simulation 2022年第11期15卷 1977-1987页

作者： Dan Wang Xiufeng Pang Wei Wang Chuan Wan Gang Wang Institute of Building Environment and Energy China Academy of Building ResearchBeijing 100013China Faculty of Information Technology Beijing University of TechnologyBeijing 100124China beijing Key Laboratory of Green Built Environment and Energy Efficient Technology Beijing University of TechnologyBeijing 100124China National Engineering research Center of Building Technology Beijing 100013China beijing Institute of Petrochemical Technology No.19 Qingyuan RoadDaxing DistrictBeijing 102627China Department of Civil Architectural and Environmental EngineeringUniversity of MiamiMiamiFL 33146USA

Building energy modeling,also known as building energy simulation,has developed rapidly in recent years and plays a crucial role in building life-cycle *** can be employed in the design phase to predict the energy consumption of different design schemes and evaluate various control and retrofitting measures at the operation *** such simulations,it is commonly understood and accepted that the simulated relative differences are more reliable than the predictions of absolute energy ***,whether this common understanding is true is yet to be thoroughly *** this study,we investigate the simulated relative differences and the extent to which they are affected by the degree of model input *** and Monte Carlo approaches are adopted for the *** results indicate that the simulated relative differences are not as reliable as expected,and the outputs strongly depend on the degree of the model input *** the degree of deviation is less than 15%or the model inputs are within reasonable ranges,the simulated relative differences match the baseline obtained using Monte Carlo ***,the model’s error indicators meet the requirements of the ASHRAE Guideline 14–2014 when the degree of input deviation is below 15%.

关键词： simulated relative differences building energy simulation Monte Carlo simulation EnergyPlus

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Enhanced photocatalytic N2 fixation by promoting N2 adsorption with a co-catalyst

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Science Bulletin 2019年第13期64卷 918-925页

作者： Xiang Gao Li An Dan Qu Wenshuai Jiang Yanxiao Chai Shaorui Sun Xingyuan Liu Zaicheng Sun State Key Laboratory of Luminescence and Applications Changchun Institute of OpticsFine Mechanics and PhysicsChinese Academy of SciencesChangchun 130033China University of Chinese Academy of Sciences Beijing 100190China Center of Excellence for Environmental Safety and Biological Effects Beijing Key Laboratory of Green Catalysis and Separation Department of Chemistry and Chemical EngineeringSchool of Environmental and EnergyBeijing University of TechnologyBeijing 100124China

Photocatalytic N2 fixation involves a nitrogen reduction reaction on the surface of the photocatalyst to convert N2 into ***,the adsorption of N2 is the limiting step for the N2 reduction reaction on the surface of the *** on the concept of photocatalytic water splitting,the photocatalytic efficiency can be greatly enhanced by introducing a *** this report,we proposed a new strategy,namely,the loading of a NiS co-catalyst on CdS nanorods for photocatalytic N2 *** calculation results indicated that N2 was effectively adsorbed onto the NiS/CdS *** programmed desorption studies confirmed that the N2 molecules preferred to adsorb onto the NiS/CdS *** sweep voltammetry results revealed that the overpotential of the N2 reduction reaction was reduced by loading ***,transient photocurrent and electrochemical impedance spectroscopy indicated that the charge separation was enhanced by introducing *** N2 fixation was carried out in the presence of the catalyst dispersed in water without any sacrificial *** a result,1.0 wt% NiS/CdS achieved an ammonia production rate of 2.8 and 1.7 mg L-1 for the first hour under full spectrum and visible light(λ>420 nm),*** catalyst demonstrated apparent quantum efficiencies of 0.76%,0.39% and 0.09% at 420,475 and 520 nm,res *** study provides a new method to promote the photocatalytic efficiency of N2 fixation.

关键词： N2 fixation Photocatalyst Co-catalyst N2 adsorption NiS

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Reconfigurable logic and in-sensor encryption operations in an asymmetrically tunable van der Waals heterostructure

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Nano research 2024年第4期17卷 3113-3119页

作者： Fan Gong Wenjie Deng Yi Wu Fengming Liu Yihao Guo Zelin Che Jingjie Li Jingzhen Li Yang Chai Yongzhe Zhang Key Laboratory of Optoelectronics Technology of Education Ministry of China Faculty of Information TechnologyBeijing University of TechnologyBeijing 100124China Key Laboratory of Advanced Functional Materials Ministry of EducationFaculty of Materials and ManufacturingBeijing University of TechnologyBeijing 100124China Department of Applied Physics Hong Kong Polytechnic UniversityKowloonHong KongChina

Reconfigurable devices can be used to achieve multiple logic operation and intelligent optical sensing with low power consumption,which is promising candidates for new generation electronic and optoelectronic integrated ***,the versatility is still limited and need to be extended by the device architectures ***,we report an asymmetrically gate two-dimensional(2D)van der Waals heterostructure with hybrid dielectric layer SiO_(2)/hexagonal boron nitride(h-BN),which enable rich function including reconfigurable logic operation and in-sensor information encryption enabled by both volatile and non-volatile optoelectrical *** the partial gate is grounded,the non-volatile light assisted electrostatic doping endowed partially reconfigurable doping between n-type and p-type,which allow the switching of logic XOR and not implication(NIMP).When the global gate is grounded,additionally taking the optical signal as another input signal,logic AND and OR is realized by combined regulation of the light and localized gate *** on the high on/off current ratio approaching 105 and reliable&switchable logic gate,in-sensor information encryption and decryption is demonstrated by manipulating the logic ***,these results provide strong extension for current reconfigurable electronic and optoelectronic devices.

关键词： in-sensor encryption reconfigurable logic van der Waals heterostructure asymmetrical tunable architecture

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TiO2 sensitized by red-, green-, blue-emissive carbon dots for enhanced H2 production

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Rare Metals 2019年第5期38卷 404-412页

作者： Dong-Xue Yang Dan Qu Xiang Miao Wen-Shuai Jiang Li An Yuan-Jing Wen Dan-Dan Wu Zai-Cheng Sun beijing Key Laboratory for Green Catalysis and Separation Department of Chemistry and Chemical Engineering School of Environmental and Energy Beijing University of Technology

Carbon dots(Cdots)with a broad light absorption range could be a potential stable sensitizer for TiO2,which is an excellent ultraviolet(UV)response ***,we systematically investigated the different color emissive Cdots-sensitized TiO2 for H2 ***,all kinds of Cdots enhanced the photocatalytic properties of *** the Cdots-sensitized TiO2 exhibits visible light H2 production due to their absorption in the visible light *** photocurrent and H2 production amount display strong dependence on the light absorption range of *** blue-emissive Cdots endow the weak H2 production rate due to its weak absorption in the visible *** enhanced photocatalytic activities are mainly contributed to the strong light absorbance and high-efficient charge *** light absorption of green-and red-emissive Cdots is another main factor for the high catalytic activities besides charge separation.

关键词： TiO2 Carbon dots Visible light absorption Sensitizer H2 production

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A roughness parameter considering joint material properties and peak shear strength model for rock joints

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International Journal of Mining Science and Technology 2021年第3期31卷 413-420页

作者： Liren Ban Weisheng Du Tianwei Jin Chengzhi Qi Xiaozhao Li School of Civil and Transportation Engineering Beijing University of Civil Engineering and ArchitectureBeijing 100044China Deep Mining and Rock Burst research Institute China Coal Research InstituteBeijing 100013China State Key Laboratory of Coal Mining and Clean Utilization China Coal Research InstituteBeijing 100013China

This study aims at proposing a reasonable roughness parameter that can reflect the peak shear strength(PSS)of rock ***,the contribution of the asperities with different apparent dip angles to shear strength is *** the shear strength of the entire joint asperities is *** results showed that the PSS of the entire joint asperities is proportional to a key parameter hs,which is related to the geometric character of the joint surface and the joint material *** parameter hsis taken as the new roughness parameter,and it is reasonable to associate the PSS with the geometric characteristics of the joint *** on the new roughness parameter and shear test results of 20 sets of joint specimens,a new PSS model for rock joints is *** new model is validated with the artificial joints in this paper and real rock joints in published *** showed that it is suitable for different types of rock joints except for gneiss *** new model has the form of the Mohr-Coulomb model,which can directly reflect the relationship between the 3 D roughness parameters and the peak dilation angle.

关键词： Roughness Joint material properties Rock joints Peak shear strength Asperities

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A NSZT Method for Frequency Estimation and Anti-noise Performance Analysis

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Chinese Journal of Electronics 2018年第3期27卷 648-657页

作者： ZHANG Wenxin LIU Xiaojun CHEN Xiuwei LIU Qing FANG Guangyou University of Chinese Academy of Sciences Key Laboratory of Electromagnetic Radiation and Sensing Technology Chinese Academy of Sciences

Among all the frequency estimation algorithm, the spectrum zooming method has superiority for high resolution and excellent anti-noise performance,but it needs more computational resource. The typical spectrum zooming methods include Zoom fast Fourier transform(ZFFT), Chirp-Z transform(CZT) and zeropadding, which are all uniform spectrum zooming methods. A Nonuniform spectrum zooming transform(NSZT)method with higher accuracy, better anti-noise ability and higher efficiency is presented. To verify the proposed method, the Monte-Carlo simulations are performed. Results are presented and compared with the Cramer-Rao bound(CRB) method, showing that the proposed algorithm has the least Mean square error(MSE) among these algorithms. This NSZT method is used in a 24 GHz Frequency modulated continuous wave(FMCW) radar system and an experiment for the real-time ranging is *** experimental results show that the ranging error of the radar system is about 5 mm in 10 m, which verifies the feasibility of our proposed method.

关键词： Frequency Estimation Nonuniform Anti-noise

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