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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 al.ohol 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 al.ohol solvent evaporation hydrogen bond S and Co co-doped carbon catalysts wastewater remediation

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Spectrophotometric analyses of hexahydro-1,3,5-trinitro-1,3,5-triazine(RDX) in water

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Journal.of Environmental Sciences 2015年第7期27卷 39-44页

作者： Cong Shi Zhonghou Xu Benjamin l.Smolinski Per M.Arienti Gregory o'Connor xiaoguang Meng Center for Environmental Systems Stevens Institute of Technology US Army RDECoM-ARDEC

A simple and accurate spectrophotometric method for on-site analysis of royal demolition explosive（RDX） in water samples was developed based on the Berthelot reaction. The sensitivity and accuracy of an existing spectrophotometric method was improved by：replacing toxic chemicals with more stable and safer reagents; optimizing the reagent dose and reaction time; improving color stability; and eliminating the interference from inorganic nitrogen compounds in water samples. Cation and anion exchange resin cartridges were developed and used for sample pretreatment to eliminate the effect of ammonia and nitrate on RDX analyses. The detection limit of the method was determined to be 100 μg/l. The method was used successfully for analysis of RDX in untreated industrial wastewater samples. It can be used for on-site monitoring of RDX in wastewater for early detection of chemical spills and failure of wastewater treatment systems.

关键词： Berthelot reaction Exchange resins RDXS pectrophotometric method Water

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Exponential sums involving automorphic forms for Gl(3)over arithmetic progressions

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Frontiers of Mathematics in China 2018年第6期13卷 1355-1368页

作者： xiaoguang HE School.of Mathematics Shandong UniversityJinan 250100China

let f be a Hecke-Maass cusp form for Sl(3,ℤ) with Fourier coeffcients Af (m, n), and let ϕ(x) be a C∞-function supported on [1, 2] with derivatives bounded by ϕ(j)(x)≪j 1: We prove an asymptotic formula for the nonli... 详细信息

关键词： Automorphic forms for Gl(3) exponential sum arithmetic progression

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FABRICATIoN oF PIEZoElECTRIC BIMoRPH USING lEAD ZIRCoNATE TITANATE THIN FIlM DEPoSITED BY HYDRoTHERMAl METHoD

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Chinese Journal.of Mechanical Engineering 2007年第6期20卷 5-8页

作者： DU liqun lü Yan DoNG Weijie GAo xiaoguang Key laboratory for Precision ＆ Nontraditional Machining Technology of Ministry of Education Dalian University of Technology Dalian 116023 China School.of Electronic and Information Engineering Dalian University of Technology Dalian 116023 China Key laboratory for Micro/Nano Technology and System Dalian University of Technology Dalian 116023 China

In order to describe the characteristics of piezoelectric bimorph, properties of lead zirconate titanate （lZT） film are studied by X-ray diffraction （XRD） and scanning eletron microscope （SEM）. The ratio of PbTioJPbZro3 in lZT is 53/47, which is around morphotropic phase boundary （MPB）. lZT film is composed of cubic particles with the average size of 5 ~ma. Density of thin film is figured out through the datum measured in experiments. The displacement model used to analyze the driving ability of bimorph is set up, and the effect of elastic intermediate layer is taken into account. Piezoelectric coefficient of lZT film is worked out by using the displacement model. Experiments of driving ability show that deformation of bimorph free end does not increase with times of crystal growth processes and the maximum deformation is obtained after two times crystal growth processes. Finally, the ferroelectric property of the bimorph is investigated and coercive voltage of the bimorph is obtained.

关键词： Piezoelectric bimorph lead zirconate titanate (lZT) film Hydrothermal method

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Red tetrazolium as an effective inhibitor for the corrosion of cold rolled steel in 7.0 mol·l^(-1) H_2So_4 solution

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Chinese Journal.of Chemical Engineering 2018年第12期26卷 2641-2653页

作者： Xianghong li Shuduan Deng xiaoguang Xie Faculty of Chemical Engineering Southwest Forestry University Faculty of Materials Science and Engineering Southwest Forestry University School.of Chemical Science and Technology Yunnan University

The corrosion inhibition of cold rolled steel(CRS) in 7.0 mol·l^(-1) H_2 So_4 solution by red tetrazolium(RTZ) was carefully investigated using both experimental procedures and theoretical techniques. The results show that RTZ acts as an effective inhibitor for the corrosion of CRS in 7.0 mol·l^(-1) H_2So_4, and the maximum inhibition efficiency is higher than 95% with a RTZ concentration of 2.0 mmol·l^(-1). The adsorption of RTZ on CRS surface fol.ows langmuir isotherm. RTZ effectively retards both cathodic and anodic reactions, and acts as a mixed-type inhibitor. EIS exhibits two capacitive l.ops, and their resistances increase drastically in the presence of RTZ. SEM and AFM confirm that the addition of RTZ could significantly retard the corrosion of CRS surface. A series of characterizations like FTIR, RS, XRD and XPS reveal that the corrosion CRS surface is composed of the corrosion products of iron sulfates, iron oxides and iron hydroxide, as well as inhibitor. Theoretical results of quantum chemical calculation and molecular dynamics(MD) indicate that the adsorption center of RTZ+(organic cationic part of RTZ) mainly relies on its tetrazole ring,and the adsorption of RTZ+on Fe(001) surface is in a nearly flat orientation mode.

关键词： Steel Sulfuric acid Red tetrazolium Corrosion inhibitor Adsorption

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Numerical simulation on gradient cooling behavior of jumbo slab ingot

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China Foundry 2013年第2期10卷 87-91页

作者： lü Nan Jin Yonglong li Shengli Ai Xingang Yuan xiaoguang School.of Materials and Metallurgy University of Science and Technology Liaoning Tangshan Iron and Steel Group Corporation Shenyang University of Technology

Shrinkage porosity defect is often found in an air cooled jumbo steel ingot, which will influence the quality of the final rolled plates. In practical production, some rolled plates are frequently rejected due to the serious shrinkage porosity of the ingot. To improve the quality of the ingot, a new cooling method, gradient cooling process （in which the upper part of the ingot is air cooled and the lower part is spray cooled） was put forward in this study. The solidification behaviors for a 60 t jumbo slab ingot under gradient cooling condition were simulated using the ProCast software, and the results were compared with those of an ingot by air cooling condition. The solidifying tendency, temperature field and distribution of shrinkage porosities in the ingot under different cooling conditions were analyzed. Simulation results show that under gradient cooling condition the solidification of the slab ingot progresses in an upward manner along the vertical z axis and in a centripetal manner along the horizontal x and y axes. Gradient cooling can efficiently reduce shrinkage porosity of the jumbo slab ingot by optimizing the solidification sequence, and making the position of shrinkage porosity move from near the middle height of the ingot （under air cooling condition） towards the head of the ingot; and the secondary shrinkage is eliminated. In addition, the solidification time of the ingot under gradient cooling is 7.3 h in this simulation, which is 2.7 h faster than that under air cooling. A 60 t jumbo slab ingot was successfully produced under gradient cooling condition. The ingot was rolled to a plate with a thickness of 100 mm and length of 18,000 mm, and ultrasonic flaw detection was performed. Some porosity was found along the axis of the plate at 4,900 position of the defect is moved towards the head with the simulated result. - 6,000 mm from the head of the plate, indicating that the of the ingot. This distribution trend of the defect is consistent

关键词： gradient cooling slab ingot temperature field shrinkage numerical simulation

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A Novel Blind Motion Blur Restoration Al.orithm for Text Images

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Chinese Journal.of Electronics 2020年第1期29卷 161-167页

作者： WANG Simin lI xiaoguang ZHANG Hui ZHUo li Faculty of Information Technology Beijing University of Technology

Text images captured by the surveillance system or hand-hold cameras often suffer from motion blur due to the complex relative motion between the camera and the target during the exposure time. The accuracy of the kernel estimation and the effective priors for clear text images are two important keys in blind motion deblurring.A novel blind motion deblurring al.orithm is proposed for text images in a complex scene. A criterion for selecting informative edges and an l0constraint are combined to improve the accuracy of the kernel estimation. Then, a fast non-blind deconvolution scheme is applied to accelerate the al.orithm. Experimental results on text images show that the proposed method can achieve high-quality results with low computational complexity.

关键词： Text image deblurring Informative edges selection l0-Regularized prior Blind motion restoration

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Adsorption and recovery of phosphate from water by amine fiber,effects of co-existing ions and column filtration

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Journal.of Environmental Sciences 2020年第1期32卷 123-132页

作者： Jinshan Wei xiaoguang Meng Xianghua Wen Yonghui Song School.of Environment Tsinghua UniversityBeijing 100084China Center for Environmental Systems Stevens Institute of TechnologyHobokenNJ 07030USA State Key laboratory of Environmental Criteria and Risk Assessment Chinese Research Academy of Environmental SciencesBeijing 100012China

A weak-base adsorption fiber,acrylic amine fiber(AAF),was prepared for removal and recovery of phosphate from *** adsorption properties of the AAF for phosphate and effects of co-existing ions were investigated using batch and column filtration experiments,scanning electron microscope,and Fourier transform infrared *** results showed that AAF had a high phosphate adsorption capacity of 119 mg/g at pH *** effects of calcium,sulfate,carbonate,nitrate,and fl.oride showed that sulfate and calcium inhibited phosphate ***,AAF showed higher binding affinity toward phosphate than *** filtration results showed that AAF could filter 1420 bed volumes of tap water containing 1.0 mg-P/l.of *** saturated AAF could be regenerated using 0.5 mol/l hydrochloric acid solution and *** desorption,phosphate was recovered through precipitation of hydroxyapatite(Ca5(Po4)3oH).The easy of regeneration,good adsorption performance,and the fiber morphology of AAF make it an attractive alternative for phosphate recovery from multiple water sources.

关键词： Wastewater treatment Phosphate removal Adsorption Acrylic amine fiber Phosphorus recovery

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Controllable construction of la_(2)li_(0.5)Co_(0.5)o_(4)multifunctional“armor”to stabilize li-rich layered oxide cathode for highperformance lithium-ion batteries

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Nano Research 2023年第7期16卷 10634-10643页

作者： Xiaoyang Deng Mi li Zizai Ma xiaoguang Wang Institute of New Carbon Materials College of Materials Science and EngineeringTaiyuan University of TechnologyTaiyuan 030024China Shanxi Key laboratory of Gas Energy Efficient and Clean Utilization Taiyuan 030024China College of Chemistry Taiyuan University of TechnologyTaiyuan 030024China

lithium-rich manganese-based cathodes(lR)are valuable cathode materials for the next generation of lithium-ion batteries(lIBs)with high-energy ***,the fast voltage/capacity decay on cycling is the major obstacle for the practical application induced by the less-than-ideal anionic redox reactions and structure ***,in order to tackle these challenges,a perovskite-like la_(2)li_(0.5)Co_(0.5)o_(4)(ll.o)material is selected as protective surface to stabilize the li_(1.2)Mn_(0.54)Ni_(0.13)Co_(0.13)o_(2)(lR)substrate through wet chemical coating *** structure/phase characterizations and electrochemical tests exhibit that the ll.o can not only minish the oxygen evolution and enhance the structure stability,but al.o restrain the electrolyte corrosion and increase the mechanical strength of cathode ***,the coated ll.o with high electronic/ionic conductivity dramatically accelerates the energy storage kinetic,thereby displaying the improved rate ***,the optimized lR@ll.o sample(1ll.o)exhibits a high capacity of 250.6 mAh·g^(-1)after 100 cycles at 0.1 C and excellent capacity retention of 82.6%after 200 cycles at 2 *** work provides a new idea for the modification of lR cathodes toward commercial high-performance lIBs.

关键词： lithium-rich manganese-based oxide lithium-ion batteries surface modification electrochemical performance

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T_C-Gorenstein Projective,l_C-Gorenstein Injective and H_C-Gorenstein Flat Modules

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Chinese Annals of Mathematics,Series B 2014年第1期35卷 115-124页

作者： Zhen ZHANG Xiaosheng ZHU xiaoguang YAN Department of Primary education Zibo Normal College Department of Mathematics Nanjing University Department of Mathematics and Information Technology Nanjing Xiaozhuang University

The authors introduce and investigate the Tc-Gorenstein projective, lc- Gorenstein injective and Hc-Gorenstein flat modules with respect to a semidualizing module C which shares the common properties with the Gorenstein projective, injective and flat modules, respectively. The authors prove that the classes of all the Tc-Gorenstein projective or the Hc-Gorenstein flat modules are exactly those Gorenstein projective or flat modules which are in the Auslander class with respect to C, respectively, and the classes of all the lc-Gorenstein ＇injective modules are exactly those Gorenstein injective modules which are in the Bass class, so the authors get the relations between the Gorenstein projective, injective or flat modules and the C-Gorenstein projective, injective or flat modules. Moreover, the authors consider the Tc（R）-projective and lc（R）-injective dimensions and Tc（R）-precovers and lc（R）-preenvelopes. Fiually, the authors study the Hc-Gorenstein flat modules and extend the Foxby equivalences.

关键词： Tc-Gorenstein projective module C-Gorenstein projective module Semidualizing module Foxby equivalence Precover Preenvclope

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