|
|
|
题名
|
作者
|
年代
|
出处
|
被引量
|
| 1 | An efficient visible-light photocatalyst for CO2 reduction fabricated by cobalt porphyrin and graphitic carbon nitride via covalent bonding显示文摘Nanoparticle photosensitizers possess technical advantages for photocatalytic reactions due to enhanced light harvesting and efficient charge transport.Here we report synthesis of semiconductor nanoparticles through covalent coupling and assembly of metalloporphyrin with condensed carbon nitride.The resultant nanoparticles consist of light harvesting component from the condensed carbon nitride and photocatalytic sites from the metalloporphyrins.This synergetic particle system effectively initiates efficient charge separation and transport and exhibits excellent photocatalytic activity for CO2 reduction.The CO production rate can reach up to 57μmol/(g·h)with a selectivity of 79%over competing H2 evolution.Controlled experiments demonstrate that the combination of light harvesting with photocatalytic activity via covalent assembly is crucial for the high photocatalytic activity.Due to effective charge separation and transfer,the resultant nanoparticle photocatalysts show exceptional photo stability against photo-corrosion under light irradiation,enabling for long-term utilization.This research opens a new way for the development of stable,effective nanoparticle photocatalysts using naturally abundant porphyrin pigments. | Shufang Tian Sudi Chen Xitong Ren Yaoqing Hu Haiyan Hu Jiajie Sun Feng Bai | 2020 | Nano Research2020，13，10： | 9 |
| 2 | Chemically modified magnetic chitosan microspheres for Cr(VI) removal from acidic aqueous solution显示文摘 | Xitong Sun Qian Li Liangrong Yang Huizhou Liua | 2016 | Particuology2016，14，3： | 4 |
| 3 | Synthesis of polyethylenimine-functionalized poly (glycidyl methaerylate) magnetic microspheres and their excellent Cr(VI) ion removal properties显示文摘 | Xitong Sun Liangrong Yang Huifang Xing | 2013 | Chemical Engineering Journal2013，234，： | 1 |
| 4 | Control Design and Implementation of a Spiral Spring Energy Storage System Connected to a Grid via PMSG显示文摘For an innovative spiral spring energy storage system,the permanent magnet synchronous generator(PMSG)is utilized as the energy conversion device due to its simple structure,low weight and high torque.During power generation,the output torque and moment of inertia of the spiral spring are changing continuously and simultaneously and the parameters of the PMSG show uncertainties.Furthermore,the DC link voltage of the converter should be stable and the power injected into the grid needs to be controlled.First,the change features of the external power source and the uncertainties of the generator’s internal parameters are expressed as the comprehensive disturbances,which are introduced into the dynamic model of the PMSG and also modify the dynamic model.Then,the high gain observers are utilized to estimate the comprehensive disturbances,and an improved robust backstepping control scheme integrating L2 gain and high gain observers is proposed.Secondly,the gridside inverter controller for the DC voltage loop and reactive power loop is designed based on the backstepping theory.Finally,hardware implementation is fulfilled to verify the presented algorithm.The results show that high gain observers are able to accurately estimate the external and internal interferences;the proposed control scheme can effectively suppress the external and internal interferences and guarantees output current,operating speed of the PMSG and output reactive power to correctly track respective references,and effectively stabilize the DC link voltage. | Yang Yu Zengqiang Mi Xudong Guo Xitong Niu Xiaojiang Zheng Chenjun Sun | 2018 | CSEE Journal of Power and Energy Systems2018，4，3： | 1 |
| 5 | The Dark Sideof Elderly Acceptance of Preventive Mobile Health Services in China 显示文摘 | Guo Xitong Sun Yongqiang Wang Nan etal | 2013 | Electron Markets2013，，23： | 1 |
| 6 | Preparation, characterization, and in vitro/vivo evaluation of polymer-assisting formulation of atorvastatin calcium based on solid dispersion technique显示文摘Due to low solubility and bioavailability, atorvastatin calcium is confronted with challenge in conceiving appropriate formulation. Solid dispersion of atorvastatin calcium was prepared through the solvent evaporation method, with Poloxamer 188 as hydrophilic carriers. This formulation was then characterized by scanning electron microscopy, differential scanning calorimetry, powder X-ray diffraction and fourier transform infrared spectroscopy. Moreover, all these studies suggested the conversion of crystalline atorvastatin calcium. In addition, the drug solubility studies as well as dissolution rates compared with bulk drug and market tablets Lipitor were also examined. Furthermore, the study investigated the pharmacokinetics after oral administration of Lipitor and solid dispersion. And the AUC 0–8 h and C max increased after taking ATC-P188 solid dispersion orally compared with that of Lipitor. All these could be demonstrated that ATC-P188 solid dispersions would be prospective means for enhancing higher oral bioavailability of ATC. | Wenxiang Dong Xitong Su Meng Xu Mingming Hu Yinghua Sun Peng Zhang | 2018 | Asian Journal of Pharmaceutical Sciences2018，13，6： | 1 |
| 7 | Amino-functionalized magnetic cellulose nanocomposite as adsorbent for removal of Cr(VI): Synthesis and adsorption studies显示文摘 | Xitong Sun Liangrong Yang Qian Li Junmei Zhao Xiaopei Li Xiaoqin Wang Huizhou Liu | 2013 | Chemical Engineering Journal2013，，： | 1 |
| 8 | Polystyrene microsphere-immobilized palladium(Ⅱ)porphyrin as mild,reusable,and highly efficient catalyst for Heck reaction显示文摘A novel Heck reaction catalyst consisting of a palladium(Ⅱ) complex of meso-tetra(phydroxyphenyl)porphyrin(MTP) and cross-linked chloromethylated polystyrene microspheres(PMs) was successfully prepared via covalent ether bonds between the chloride groups in the PMs and the hydroxyl groups in MTP.The catalyst was characterized using scanning electron microscopy,Fourier-transform infrared spectroscopy,and inductively coupled plasma atomic emission spectroscopy(ICP-AES).This polystyrene-supported palladium-complex was an efficient heterogeneous catalyst for cross-coupling of aryl iodides with ethyl acrylate.The reaction of iodobenzene and ethyl acrylate under N_2 at 100 ℃ and a catalyst concentration of 0.1%gave a gas chromatography product yield of 99.8%,which is much higher than that achieved using a free palladium(Ⅱ) complex of MTP as the catalyst(41.3%).The catalyst was recycled up to six times without significant loss of catalytic activity.These results suggest that the immobilized palladium(Ⅱ)-MTP catalyst has potential applications in synthetic and industrial chemistry. | Yinbin Huang Liangrong Yang Minghui Huang Jian Wang Lin Xu Wensong Li Huacong Zhou Xitong Sun Huifang Xing Huizhou Liu | 2015 | Particuology2015，13，5： | 1 |
| 9 | Kinetically accelerated and high-mass loaded lithium storage enabled by atomic iron embedded carbon nanofibers显示文摘Carbonaceous materials represent the dominant choice of materials for anodic lithium storage in many energy storage devices.Nevertheless,the nonpolar carbonaceous materials offer weak adsorption toward Li+that largely denies the high-rate Li+storage.Herein,the atomic Fe sites decorated carbon nanofibers(AICNFs)facilely produced by electrospinning are reported for kinetically accelerated Li+storage.Theoretical calculation reveals that the atomic Fe sites possess coordination unsaturated electronic configuration,enabling suitable bonding energy and facilitated diffusion path of Li+.As a result,the optimal structure displays a high capacitive contribution up to 95.9%at a scan rate of 2.0 mV·s^(−1).In addition,ultrahigh capacity retention of 97%is afforded after 5,000 cycles at a current density of 3 A·g^(−1).Moreover,the interlaced fiber structure enabled by electrospinning benefits structural stability and improved conductivity even at thick electrodes,thus allowing a high areal capacity of 1.76 mAh·cm−2 at a loading of 8 mg·cm−2.Because of these structure and performance merits,the lithium-ion capacitor containing the AICNF-based anode delivers a high energy density and large power density. | Qian Xu Yanan Li Chenghao Wu Xitong Sun Qiang Li Huabin Zhang Le Yu Yuanyuan Pan Yujuan Wang Shiwei Guo Mengdi Zhang Han Hu Mingbo Wu | 2022 | Nano Research2022，15，7： | 0 |
| 10 | Theoretical insight into the selectivities of copper-catalyzing heterogeneous reduction of carbon dioxide显示文摘The chemical reduction of carbon dioxide(CO2) has always drawn intensive attentions as it can not only remove CO2 which is the primary greenhouse gas but also produce useful fuels. Industrial synthesis of methanol utilizing copper-based catalysts is a commonly used process for CO2 hydrogenation. Despite extensive efforts on improving its reaction mechanism by identifying the active sites and optimizing the operating temperature and pressure, it is still remains completely unveiled. The selectivities of CO2 electroreduction at copper electrode could mainly be towards carbon monoxide(CO), formic acid(HCOOH), methane(CH4) or ethylene(C2H4), which depends on the chemical potentials of hydrogen controlled by the applied potential. Interestingly, methanol could hardly be produced electrochemically despite utilizing metallic copper as catalysts in both processes. Moreover, the mechanistic researches have also been performed aiming to achieve the higher selectivity towards more desirable higher hydrocarbons. In this work, we review the present proposals of reaction mechanisms of copper catalyzing CO2 reduction in industrial methanol synthesis and electrochemical environment in terms of density functional theory(DFT) calculations, respectively. In addition, the influences of the simulation methods of solvation and electrochemical model at liquid-solid interface on the selectivity are discussed and compared. | Xitong Sun Xiaoming Cao P.Hu | 2015 | Science China Chemistry2015，58，4： | 0 |
| 11 | A first-principles microkinetic study on the hydrogenation of carbon dioxide over Cu(211) in the presence of water显示文摘The hydrogenation of carbon dioxide(CO2)is one of important processes to effectively convert and utilize CO2,which is also regarded as the key step at the industrial methanol synthesis.Water is likely to play an important role in this process,but it still remains elusive.To systematically understand its influence,here we computationally compare the reaction mechanisms of CO2 hydrogenation over the stepped Cu(211)surface between in the absence and presence of water based on microkinetic simulations upon density functional theory(DFT)calculations.The effects of water on each hydrogenation step and the whole activity and selectivity are checked and its physical origin is discussed.It is found that the water could kinetically accelerate the hydrogenation on CO2 to COOH,promoting the reverse water gas shift reaction to produce carbon monoxide(CO).It hardly influences the CO2 hydrogenation to methanol kinetically.In addition,the too high initial partial pressure of water will thermodynamically inhibit the CO2 conversion. | Xitong Sun Peng Wang Zhengjiang Shao Xiaoming Cao P.Hu | 2019 | Science China Chemistry2019，62，12： | 0 |
| 12 | Experimental test and theoretical calculation of the fracture height limit of gas pipe flow to Darcy flow显示文摘Low-speed flow experiments in which ultra-fine copper tubes are used to simulate micro-fractures in carbonate strata are conducted to analyze the variations of gas flow state in fractures of different fracture heights,determine flow state transition limit and transition interval,and establish the calculation method of flow state transition limit.The results show that the ideal Hagen-Poiseuille flow is the main form of gas flow in large fractures.Due to the decrease of fracture height,the gas flow in the fracture changes from Hagen-Poiseuille flow with ideal smooth seam surface to non-Hagen-Poiseuille flow,and the critical point of the transition is the boundary of flow state transition.After the fracture height continues to decrease to a certain extent below the boundary of the flow state transition fracture height,the form of gas flow gradually changes to the ideal Darcy flow,thus the transition interval of the gas flow state in the closing process of fracture can be determined.Based on the three-dimensional microconvex body scanning of the fracture surface,the material properties of fracture and properties of fluid in the fracture,a method for calculating the boundary of flow state transition is established.The experimental test and theoretical calculation show that the limit of the fracture height for the transition from pipe flow to Darcy flow is about twice the sum of the maximum height of the microconvex bodies on the upper and lower sides of the fracture. | XIONG Yu FU Xitong LI Qian SUN Zewei ZHANG Chun ZHANG Fei | 2022 | Petroleum Exploration and Development2022，49，3： | 0 |
| 13 | Gas-assisted magnetic separation for the purification of proteins in batch systems显示文摘 | Zhini Liu Liangrong Yang Tingting Dong Wensong Li Xitong Sun Menghao Zhu Zhengkang Duan Qingfen Liu Huizhou Liu | 2016 | Particuology2016，14，1： | 0 |
您所在的机构暂未开通此部分的功能，请联系管理员