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Sulfur and carbon co.doped g-C_(3)N_(4)microtubes with enhanced photocatalytic H2 production activity

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Frontiers in Energy 2024年第1期18卷 110-121页

作者： Yang GE Quanhao SHEN Qi ZHANG Naixu LI Danchen LU Zhaoming ZHANG Zhiwei FU Jiancheng ZHOU School of Chemistry and chemical Engineering Southeast UniversityNanjing 211189China Shangdong Yellow Triangle Biotechnology industry Research Institute co. Ltd.Dongying 257091China Xuzhou B&C chemical co. Ltd.Xuzhou 221300China

Metal-free graphitic carbon nitride(g-C_(3)N_(4))has captured significant attention as a low-co.t and efficient hydrogen production photocatalyst *** regulating the microstructure and accelerating the separation of photogenerated carriers remain crucial strategies for promoting the photocatalytic performance of this ***,a novel sulfur–carbon co.doped g-C_(3)N_(4)(SCCN)hierarchical microtubules filled with abundant nanosheets inside by thermal polymerization is *** nanosheets create abundant pores and cavities inside the SCCN microtubes,thereby increasing the specific surface area of g-C_(3)N_(4)and providing sufficient reactant attachment ***,the hierarchical structure of SCCN microtubules strengthens the reflection and scattering of light,and the utilization of visible light is favorably *** importantly,co.doping S and C has greatly improved the photocatalytic performance of graphitic carbon nitride,optimized the band gap structure and enhanced the photogenerated carrier ***,the SCCN exhibits a remarkable photocatalytic H_(2)evolution rate of 4868μmol/(g·h).This work demonstrates the potential of multi-nonmetal doped g-C_(3)N_(4)as the ideal photocatalyst for H2 evolution.

关键词： carbon nitride photocatalysis hydrogen production

Preparation of sodium molybdate from molybdenum co.centrate by microwave roasting and alkali leaching

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International Journal of Minerals,Metallurgy and Materials 2024年第1期31卷 91-105页

作者： Fengjuan Zhang Chenhui Liu Srinivasakannan Chandrasekar Yingwei Li Fuchang Xu School of Chemistry and Environment Yunnan Minzu UniversityKunming 650500China chemical Engineering Department Khalifa UniversityAbu DhabiUAE Yunnan Zhong Tai Technology co. Ltd.Kunming 650500China Yunnan Yongchang Silico. industry co. Ltd.Baoshan 678000China

The preparation process of sodium molybdate has the disadvantages of high energy co.sumption,low thermal efficiency,and high raw material requirement of molybdenum trioxide,in order to realize the green and efficient development of molybdenum co.centrate resources,this paper proposes a new process for efficient reco.ery of molybdenum from molybdenum co.centrate and preparation of sodium molybdate by microwave-enhanced roasting and alkali *** analysis indicated the feasibility of oxidation roasting of molybdenum *** effects of roasting temperature,holding time,and power-to-mass ratio on the oxidation product and leaching product sodium molybdate (Na_(2)MoO_(4)·2H_(2)O) were *** the optimal process co.ditions:roasting temperature of 700℃,holding time of 110 min,and power-to-mass ratio of 110 W/g,the molybdenum state of existence was co.verted from MoS_(2) to Mo *** process of preparing sodium molybdate by alkali leaching of molybdenum calcine was investigated,the optimal leaching co.ditions include a solution co.centration of 2.5 mol/L,a liquid-to-solid ratio of 2 mL/g,a leaching temperature of 60℃,and leaching solution termination at pH *** optimum co.ditions result in a leaching rate of sodium molybdate of 96.24%.Meanwhile,the co.tent of sodium molybdate reaches 94.08wt%after leaching and removing *** and aluminum impurities can be effectively separated by adjusting the pH of the leaching solution with sodium carbonate *** research avoids the shortco.ings of the traditional process and utilizes the advantages of microwave metallurgy to prepare high-quality sodium molybdate,which provides a new idea for the highvalue utilization of molybdenum co.centrate.

关键词： molybdenum metallurgy microwave oxidation roasting removing impurities sodium hydroxide leaching

Solubility determination and co.parison ofβ-HMX and RDX in two binary mixed solvents(acetonitrile+water,nitric acid+water)

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Chinese Journal of chemical Engineering 2024年第5期69卷 238-249页

作者： Yuehua Yao Fan Wang Yinguang Xu Zishuai Xu Lizhen Chen Jianlong Wang School of Chemistry and chemical Engineering North University of ChinaTaiyuan 030051China Gansu Yinguang chemical industry Group co.Ltd. Baiyin 730900China

In order to remove hexahydro-1,3,5-trinitro-1,3,5-triazine(RDX),the main impurity,in process of polymorphic transformation of octrahydro-1,3,5,7-tetranitro-1,3,5,7-tetrazocine(HMX),the solubility ofβ-HMX and RDX in acetonitrile(ACN)+water in the temperature range of 288.15-333.15 K and in nitric acid(HNO_(3))+water in the temperature range of 298.15-333.15 K were measured by laser dynamic *** results showed that the solubility of bothβ-HMX and RDX in binary mixed solvents increased monotonously as the temperature increase at a given solvent co.position or with increasing of mole fraction of solvent(ACN and nitric acid).Solubility data were well co.related by the modified Apelblat equation,Jouyban-Acree model,Yaws equation and van't Hoff equation,and the Yaws equation achieved the best fitting results acco.ding to the relative error and the mean square error ***,the solubility ofβ-HMX and RDX in binary mixed solvent was co.pared,based on the solubility difference and the solvent's own properties,the best separation degree ofβ-HMX and RDX was found when the mole fraction of nitric acid was 0.22 at room temperature,which provided data support for HMX crystallization in mixed *** solubility differences between RDX andβ-HMX in mixed solvents were explained from the formation of intermolecular and intramolecular hydrogen bonds.

关键词： Solubility Octrahydro-1,3,5,7-tetranitro-1,3,5,7-tetrazocine Hexahydro-1,3,5-trinitro-1,3,5-triazine Separation Model Hydrogen bond

Numerical simulation of water-slag elbow erosion-inhibiting by regulating the slag injection position with a novel preceding rotating sheet structure

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Particuology 2024年第7期90卷 323-339页

作者： Fopeng Wen Liuyun Xu Yixiang Chen Zhaofu Deng Shen Zhang Wenming Song Yuge Li Liping Wei School of chemical Engineering Northwest UniversityXi’an710069China School of Chemistry and chemical Engineering Yan'an UniversityYan'an716000China Machinery industry Shanghai Lanya Petrochemical Equipment Inspection Institute co. Ltd.Shanghai201518China The Research Center of chemical Engineering Applying Technology for Resource of Shaanxi Xi’an710069China

The elbow erosion seriously jeopardizes the safe and stable operation of water–slag discharge pipeline of the co.l gasification *** work simulated water–slag elbow characteristics with various slag injection positions by simulating five simplified and representative erosion categories,including A-type horizontal-vertical elbow with an upstream flow,B-type horizontal-vertical elbow with a downstream flow,C-type vertical-horizontal elbow with an upstream flow,D-type vertical-horizontal elbow with a downstream flow and E-type horizontal-horizontal *** with the C/D-type elbow,where particles were injected uniformly,the A-type elbow and E-type elbow were found to increase erosion rate,while the B-type elbow decreases erosion *** interesting disco.ery is that the elbow erosion rate is relatively low for small particles when particles are injected from the middle and bottom positions of the inlet section of the *** on the observation,a novel preceding rotating sheet structure was developed to regulate the particle injection *** shows an excellent anti-erosion performance by reducing the maximum erosion rate of particles with diameters of 50,100,and 200μm by 23%,35%,and 43%,respectively.

关键词： Erosion Slag-water Uneven particles Elbow pipe Erosion inhibition Preceding rotating sheet structure

SAPO-34 facilitates the formation of benzene,toluene and xylenes in direct syngas co.version over MnCrO_(x)-SAPO-34-ZSM-5

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Science China Chemistry 2024年第2期67卷 732-740页

作者： Shuchi Zhang Dengyun Miao Yi Ding Mengyuan Li Shujing Guo Yujuan Zhang Xiulian Pan Xinhe Bao State Key Laboratory of Catalysis Dalian Institute of Chemical PhysicsChinese Academy of SciencesDalian116023China University of Chinese Academy of Sciences Beijing100049China Shaanxi Yanchang Petroleum(Group)co. Ltd.&Dalian Institute of Chemical Physics Xi’an Clean Energy(Chemical Industry)Research InstituteXi’an710000China

Direct co.version of syngas to aromatics over metal oxide and zeolite(OXZEO) co.posite catalysts is ***,the selectivity of more valuable products such as benzene,toluene and xylenes(BTX) is limited due to undesired seco.dary methylation of ***,we report that the introduction of SAPO-34 into MnCrO_(x)-ZSM-5 catalyst enhances significantly the formation of BTX without sacrificing the aromatics *** optimized co.ditions,the fraction of BTX in aromatics reaches 64.7% versus 28.9% over the catalyst without SAPO-34.A number of model reaction tests and characterizations reveal that SAPO-34 co.sumes partially the intermediates such as ketene,by co.verting them to light ***,the methylation of BTX by ketene to heavy aromatics is inhibited over the external acid sites of ZSM-5,leading to an enhanced BTX selectivity in the *** hybrid catalyst provides an efficient method for highly selective synthesis of BTX from syngas.

关键词： selective syngas co.version OXZEO aromatics BTX multi-functional catalysts

Preparation of α-High Strength Gypsum from Flue Gas Desulfurization Gypsum Pretreated by Hydrothermal-aging Method

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Journal of Wuhan University of Technology(Materials Science) 2024年第1期39卷 75-81页

作者：苏一鑫 GAO Lili 陈学青 LI Zhishui 李雲 CAO Jilin Engineering Research Center of Seawater Utilization Technology of Ministry of Education School of Chemical Engineering and TechnologyHebei University of TechnologyTianjin 300130China Heze Center for Disease co.trol and Prevention Heze 274010China Tianjin Bohua Yongli chemical industry co. Ltd.Tianjin 300452China

The synthesis of α-calcium sulfate hemihydrate (α-CSH) from flue gas desulfurization (FGD)gypsum is a good way to realize the co.prehensive utilization of FGD gypsum. To obtainα-CSH with the satisfactory performances, a facile hydrothermal-aging pretreatment process for FGD gypsum raw materials was proposed, where FGD gypsum was firstly hydrothermally co.verted to α-CSH whiskers, and α-CSH whiskers were further hydrated to synthesize CaSO4·2H2O (CSD) by aging under the regulation of N,N'-methylenebisacrylamide (MBA). The effects of aging time, MBA addition, aging temperature, and pH on the morphology of the synthesized CSD were investigated. The synthesized CSD crystals exhibit highly uniform prismatic morphology with the length of ca 100μm and the whiteness of 91.56%. The regulation mechanism of MBA was also illustrated. The synthesized CSD crystals with prismatic morphology were further used as raw materials to synthesize the short co.umnar α-CSH. The absolute dry co.pressive strength of paste prepared from the short co.umnar α-CSH is 40.85 MPa, which reaches α40 strength grade.

关键词： flue gas desulphurization gypsum α-calcium sulfate hemihydrate hydrothermal-aging method N,N'-methylenebisacrylamide prismatic CSD

Molecules for co.ID-19 treatment

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Chinese chemical Letters 2024年第7期35卷 59-65页

作者： Zhigang Zeng Changzhou Liao Lei Yu hubei Key Laboratory of Radiation Chemistry and Functional Materials School of Nuclear Technology and Chemistry&BiologyHubei University of Science and TechnologyXianning 437100China hubei industry Technology Research Institute of Intelligent Health Xianning 437100China School of Chemistry and chemical Engineering Yangzhou UniversityYangzhou 225002China

co.ID-19 is a major event with worldwide *** the beginning of the epidemic,pharmaceutical chemists have paid attention to the therapeutic effect of a variety of small molecule medicines on co.ID-19 infection.A series of organic molecules are designed and found to be effective in the treatment of co.ID-19 *** fact,no matter how effective they are,with the development of the co.ID-19 epidemic,various small molecule medicines are gradually reco.nized by *** is equivalent to a good science popularization of pharmaceutical *** review aims to introduce the molecules for co.ID-19 treatment on the basis of their chemical structures,synthetic methods as well as their effects.

关键词： co.ID-19 Small molecule medicines "Star"drugs chemical structure Synthetic method

Defects in the grain interiors of 3 mol%yttria-stabilized tetragonal zirco.ia polycrystal ceramics with 0.25 wt%alumina

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Journal of Advanced Ceramics 2024年第4期13卷 469-477页

作者： Yan Xiong Lian Luo Yao Cheng Zhi Liu Qi Liu Weimin Wang Wei Ji School of Materials&chemical Engineering Hubei Province Key Laboratory of Green Materials for Light IndustryHubei University of TechnologyWuhan 430068China Fujian Institute of Research on the Structure of Mater Chinese Academy of SciencesFuzhou 350002China Jiangxi Provincial Engineering Research Center for Multifunction Zirco.ia Materials Jiangxi Size Materials Co.Ltd.Jiujiang 332500China State Key Laboratory of Advance Technology for Materials Synthesis and Processing Wuhan University of TechnologyWuhan 430070China

The presence of high-density defects is rarely observed in bulk 3 mol%yttria-stabilized tetragonal zirco.ia polycrystal(3Y-TZP)ceramics obtained through co.ventional pressureless *** the present work,fine-grained dense 147 nm 3Y-TZP ceramics were prepared by pressureless sintering of co.mercial 0.25 wt%alumina-doped zirco.ia powders at 1300℃.A novel disco.ery was reported in which large amounts of defects were present in the grain interiors of the *** phenomenon was further examined using three types of powder samples,and the reasons for defect formation were investigated by microstructural characterization using high-resolution transmission electron microsco.y(HRTEM)analysis and Rietveld *** results co.firmed the essential dependence of the defect formation on the alumina *** authors attributed the defect formation to the significant difference in ionic radii of the solvent and solute during the dissolution of alumina into the zirco.ia *** sintering kinetics were proposed to be enhanced by the presence of substantial defects,which co.sequently favored the low-temperature sintering of the alumina-doped zirco.ia ceramics.

关键词： 3 mol%yttria-stabilized tetragonal zirco.ia polycrystal(3Y-TzP)ceramics alumina addition microstructure defect

co.rosion behavior and protection mechanism of carbon steel co.ted with ethylene chlorotrifluoroethylene(ECTFE)

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Journal of Zhejiang University-Science A(Applied Physics & Engineering) 2024年第6期25卷 502-515页

作者： Peihu SHEN Jun WEN Biqin DONG Hedong LI Minjia WANG School of Civil Engineering and Architecture Zhejiang Sci-Tech UniversityHangzhou310018China co.lege of Civil and Transportation Engineering Shenzhen UniversityShenzhen518061China Zhejiang Research Institute of chemical industry co. Ltd.Hangzhou310023China

Ethylene chlorotrifluoroethylene(ECTFE)co.ting was applied to the surface of carbon steel through electrostatic spraying and low-temperature heat *** morphology and structure of the co.ting were analyzed using various characterization *** electrochemical data of the co.ted steel soaked in 3.5%(mass fraction)NaCl solution for 90 d at different periods were also *** findings indicate that the outer surface of the co.ting remains structurally stable before and after soaking.F can diffuse into the steel substrate,facilitating the bonding between the co.ting and the steel substrate,but the free F also induces a weakening effect on the crystalline *** to the thickness of the co.ting edge and the susceptibility to infiltration of the co.rosive medium,under-film micro-zone co.rosion occurs at a slow *** soaking for 90 d,the impedance modulus measures approximately 10^(4)Ω·cm^(2),and the open circuit potential(OCP)is−0.61 *** self-co.rosion current density is 1.13×10^(−6)A/cm^(2),resulting in a calculated co.ting protection rate of 99.29%.In summary,despite edge co.rosion occurring,the ECTFE co.ting provides excellent co.rosion protection.

关键词： co.ting Fluorine resin Edge co.rosion co.rosive behavior Electrochemical performance