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Optimization of Mineralization Curing System for Efficient and Safe Utilization of Steel Slag Wastes

Journal of Wuhan University of Technology(Materials Science) 2022年第4期37卷 595-602页

作者： yi haihe ZHAN Qiwei YU Xiaoniu School of Civil and Architectural Engineering Shandong University of TechnologyZibo 255000China School of Civil Engineering and Architecture Jiangsu University of Science and TechnologyZhenjiang 212003China Department of Civil and Environmental Engineering Nanyang Technological UniversitySingapore City 639798Singapore

The crystal structure and morphology of the mineralization products were studied by scanning electron microscopy(SEM)and X-ray diffraction(XRD),and the thermal properties were studied by thermogravimetric-differential scanning calorimetry(DSC)*** changes of microorganism quantity and enzyme activity in pore solution with time were *** experimental results show that microorganism quantity and enzyme activity in pore solution reach the maximum at 50-60 h,mineralization curing begins at this time,the strength of microbial mineralized steel slag reaches the *** study provides a good selection basis for selecting the optimum mineralization system for the production of microbial mineralized steel slag *** mineralization can accelerate the rate of carbon sequestration in the mineralization *** compressive strength of steel slag with 1.5% bacterial can reach up to 55.6 *** microstructure and thermal properties of calcium carbonate precipitate induced by the enzymes of bacillus subtilis differs from the chemical precipitation in pore solution of steel *** the analysis of the mineralized products of steel slag,the reaction rate of free calcium oxide and free magnesium oxide in steel slag after the addition of microorganisms is significantly increased,which improves the stability of steel slag as cementitious ***,the production of calcium carbonate,the main mineralized product,is significantly increased.

关键词： steel slag microorganism bio-mineralization enzyme activity curing system

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基于响应面法的地聚物混凝土力学性能试验研究

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硅酸盐通报 2024年第9期43卷 3192-3202页

作者：张震洋张璐伊海赫郑润马克顺张琳任梦琪王春光山东理工大学建筑工程与空间信息学院淄博255000

为获得力学性能最优的地聚物混凝土配合比,本文系统研究了以粉煤灰和矿渣为前驱体的地聚物混凝土配合比优化方法,选择水胶比、碱激发剂模数(碱激发剂中SiO_(2)与Na_(2)O分子数之比)和矿渣掺量(矿渣占前驱体的质量分数)三个因素设计响应... 详细信息

为获得力学性能最优的地聚物混凝土配合比,本文系统研究了以粉煤灰和矿渣为前驱体的地聚物混凝土配合比优化方法,选择水胶比、碱激发剂模数(碱激发剂中SiO_(2)与Na_(2)O分子数之比)和矿渣掺量(矿渣占前驱体的质量分数)三个因素设计响应面方案进行地聚物混凝土抗压试验。采用统计学方法建立抗压强度响应面模型,并验证模型与试验结果的契合度。结果表明:水胶比对地聚物混凝土的抗压强度影响显著,水胶比最佳选择为0.376;矿渣掺量对地聚物混凝土抗压强度的影响极其显著,矿渣替代粉煤灰的比例越高,地聚物混凝土抗压强度越高,矿渣最佳掺量为48.2%;激发剂模数对地聚物混凝土抗压强度的影响不显著。水胶比会影响基体的孔隙结构,矿渣通过改变基体结构密实度进而影响基体宏观力学性能。

关键词：地聚物混凝土响应面法优化设计力学性能微观结构

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微生物提升钢渣胶凝材料安定性和强度的作用及机理

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硅酸盐通报 2020年第8期39卷 2363-2371页

作者：钱春香张霄伊海赫东南大学材料科学与工程学院南京211189 东南大学绿色建材研究中心南京211189

目前钢渣排放量、库存量大,但利用率不高,关键是安定性未能解决。本文研究提出了通过微生物矿化技术提升安定性和强度,研究了不同掺量微生物对钢渣中主要矿物相碳化反应速率的影响,测试了微生物掺量和钢渣粉比表面积对试件压蒸线性膨胀... 详细信息

目前钢渣排放量、库存量大,但利用率不高,关键是安定性未能解决。本文研究提出了通过微生物矿化技术提升安定性和强度,研究了不同掺量微生物对钢渣中主要矿物相碳化反应速率的影响,测试了微生物掺量和钢渣粉比表面积对试件压蒸线性膨胀率和强度的影响,通过MIP和SEM分析试件孔隙率和微观形貌,并对微生物改性钢渣胶凝材料机理进行分析。结果表明,微生物能提高钢渣中游离氧化物和硅酸盐矿物相碳化反应速率,提高矿化产物的强度。要使试样压蒸线性膨胀率降低至0.5‰以下,采用微生物添加剂后,试验所用钢渣粉比表面积可由565 m^2/kg降低至360 m^2/kg。钢渣中掺入微生物可促进碳化过程中矿物相离子溶出和碳酸盐矿物生成,降低试件孔隙率,密实基体结构,从而提高钢渣胶凝材料试件的强度。微生物-钢渣胶凝材料制品强度可达40 MPa以上,其他物理性能均符合国家标准,在实际道路铺装工程应用中体积稳定性好,无泛碱现象,且利润优势显著,应用前景广阔。

关键词：钢渣胶凝材料安定性强度微生物矿化铺装工程

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再生骨料性能及改性方法综述

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再生资源与循环经济 2022年第10期15卷 34-39页

作者：李聪闫祥马铭宇伊海赫山东理工大学山东淄博255000

建筑业在促进经济发展的同时,大量的砂石资源消耗和建筑废弃物占地也对环境造成了巨大压力。因此,建筑和拆除废物的再生骨料回收利用成为必然趋势,诸多学者在先前的研究中分析了再生骨料在实际工程中运用的可行性。综述了利用建筑固废... 详细信息

建筑业在促进经济发展的同时,大量的砂石资源消耗和建筑废弃物占地也对环境造成了巨大压力。因此,建筑和拆除废物的再生骨料回收利用成为必然趋势,诸多学者在先前的研究中分析了再生骨料在实际工程中运用的可行性。综述了利用建筑固废生产再生骨料存在的问题,并总结分析了目前改善再生骨料性能应用较多的处理方法,得出结论,使用加速碳化处理,结合不同的微生物处理方式改善再生骨料性能,具有经济、环保、可持续的特点,有可能成为未来应用于再生骨料生产过程中更为优越、环保的方法。

关键词：再生骨料基本性能改性方法

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Preparation and properties of high-energy-density aluminum/boroncontaining gelled fuels

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Chinese Journal of Chemical Engineering 2024年第1期65卷 230-242页

作者： yi Chen Kang Xue Yang Liu Lun Pan Xiangwen Zhang Ji-Jun Zou Key Laboratory for Green Chemical Technology of the Ministry of Education School of Chemical Engineering and TechnologyTianjin UniversityTianjin 300072China Collaborative Innovative Center of Chemical Science and Engineering(Tianjin) Tianjin 300072China haihe Laboratory of Sustainable Chemical Transformations Tianjin 300192China Zhejiang Institute of Tianjin University Ningbo 315201China

Energetic nanofluid fuel has caught the attention of the field of aerospace liquid propellant for its high energy density(HED), but it suffers from the inevitable solid-liquid phase separation problem. To resolve this problem, herein we synthesized the high-Al-/B-containing(up to 30%(mass)) HED gelled fuels, with low-molecular-mass organic gellant Z, which show high net heat of combustion(NHOC), density, storage stability, and thixotropic properties. The characterizations indicate that the application of energetic particles to the gelled fuels obviously destroys their fibrous network structures but can provide the new particle-gellant gelation microstructures, resulting in the comparable stability between 1.0%(mass) Z/JP-10 + 30%(mass) Al or B and pure JP-10 gelled fuel. Moreover, the gelled fuels with high-content Al or B exhibit high shear-thinning property, recovery capability, and mechanical strength, which are favorable for their storage and utilization. Importantly, the prepared 1.0%(mass) Z/JP-10 + 30%(mass) B(or 1.0%(mass) Z/JP-10 + 30%(mass) Al) shows the density and NHOC 1.27 times(1.30) and 1.43 times(1.21)higher than pure JP-10, respectively. This work provides a facile and valid approach to the manufacturing of HED gelled fuels with high content of energetic particles for gel propellants.

关键词： Gelled fuels Energetic aluminum/boron Low-molecular-mass organic gellant Fuel property

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Spin effect on redox acceleration and regioselectivity in Fe-catalyzed alkyne hydrosilylation

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National Science Review 2024年第2期11卷 155-167页

作者： Peng He Meng-Yang Hu Jin-Hong Li Tian-Zhang Qiao yi-Lin Lu Shou-Fei Zhu Frontiers Science Center for New Organic Matter State Key Laboratory and Institute of Elemento-Organic Chemistry Nankai University

Iron catalysts are ideal transition metal catalysts because of the Earths abundant, cheap, biocompatible features of iron salts. Iron catalysts often have unique open-shell structures that easily undergo spin crossover in chemical transformations, a feature rarely found in noble metal catalysts. Unfortunately, little is known currently about how the open-shell structure and spin crossover affect the reactivity and selectivity of iron catalysts, which makes the development of iron catalysts a low efficient trial-and-error program. In this paper, a combination of experiments and theoretical calculations revealed that the iron-catalyzed hydrosilylation of alkynes is typical spin-crossover catalysis. Deep insight into the electronic structures of a set of well-defined open-shell active formal Fe(0) catalysts revealed that the spin-delocalization between the iron center and the 1,10-phenanthroline ligand effectively regulates the iron center's spin and oxidation state to meet the opposite electrostatic requirements of oxidative addition and reductive elimination, respectively,and the spin crossover is essential for this electron transfer process. The triplet transition state was essential for achieving high regioselectivity through tuning the nonbonding interactions. These findings provide an important reference for understanding the effect of catalyst spin state on reaction. It is inspiring for the development of iron catalysts and other Earth-abundant metal catalysts, especially from the point of view of ligand development.

关键词： spin effect spin-delocalization spin crossover iron-catalysis alkyne hydrosilylation

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Cucurbit[8]uril-based non-covalent heterodimer realized NIR cell imaging through topological transformation from nanowire to nanorod

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Chinese Chemical Letters 2024年第10期35卷 262-268页

作者： Jianqiu Li yi Zhang Songen Liu Jie Niu Rong Zhang Yong Chen Yu Liu College of Chemistry State Key Laboratory of Elemento-Organic ChemistryNankai UniversityTianjin 300071China

In recent years,multicolor cascade supramolecular assemblies with controllable topological morphology have become a research hotspot due to their wide application in light-emitting materials,cell imaging and other ***,several kinds of macrocycles including cucurbiturils,calixarene and cyclodextrins are used as building blocks to construct fluorescent assemblies with anthryl-conjugated phenylpyridine(G),wherein cucurbit[8]uril(CB[8])and G can form nanowires at a stoichiometric ratio of n:n through host-guest encapsulation to form a non-covalent ***,the macrocycle confinement effect drastically enhances the fluorescence emission of G and emission peak generated bathochromic shift from 500 nm to 600 *** the supramolecular polymer is further assembled with amphiphilic calix[4]arene(SC_(4)A8),the fluorescence emission of G?CB[8]further increases to 1.4 times,accompanied by the morphological transformation from linear structure to nanorod ***,a very small amount of dye Cy5 is added to the assembly solution as an energy receptor,and the negatively charged G?CB[8]@SC_(4)A8 system is regarded as an energy *** efficient energy transfer process enables near-infrared(NIR)emission at 675 nm with 71%energy transfer efficiency(ΦET)at a donor/receptor ratio of 100:***,the cascade supramolecular assembly has been successfully applied to targeted imaging in the nucleus of HeLa and A549 cancer cells.

关键词： Multivalent assemblies Cucurbituril Morphological transformation Targeted imaging

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Iridium-Catalyzed Asymmetric Hydrogenation of Dialkyl Imines

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CCS Chemistry 2024年第4期6卷 905-911页

作者： Zheng Wang Xin-yi Yang Yue Xu Qi-Lin Zhou State Key Laboratory and Institute of Elemento-Organic Chemistry College of ChemistryFrontiers Science Center for New Organic MatterNankai UniversityTianjin 300071

Asymmetric hydrogenation of dialkyl imines to chiral amines is difficult because the two alkyls of imines are so similar in spatial and electronic structure that chiral catalysts are difficult to distinguish between *** this study,we described an asymmetric hydrogenation of dialkyl imines by a chiral iridium catalyst containing spiro phosphine-amine-phosphine *** precisely adjusting the chiral pocket of catalyst,a highly efficient catalyst was *** this catalyst,a variety of dialkyl imines were hydrogenated to chiral amines with high yield and enantioselectivity.

关键词： spiro PNP ligand iridium catalyst enantioselective hydrogenation dialkyl imines chiral amines

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Photoinduced transposed Paternò-Büchi reaction for effective synthesis of high-performance jet fuel

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Chinese Journal of Chemical Engineering 2024年第3期67卷 39-48页

作者： Jinxiu Hu Xianlong Liu yi Liu Kang Xue Chengxiang Shi Xiangwen Zhang Li Wang Ji-Jun Zou Lun Pan Key Laboratory for Green Chemical Technology of the Ministry of Education School of Chemical Engineering and TechnologyTianjin UniversityTianjin 300072China haihe Laboratory of Sustainable Chemical Transformations Tianjin 300192China Zhejiang Institute of Tianjin University Ningbo 315201China Collaborative Innovative Center of Chemical Science and Engineering(Tianjin) Tianjin 300072China

High-energy-density fuels are important for volume-limited aerospace vehicles,but the increase in fuel energy density always leads to poor cryogenic ***,we investigated the transposed Paternò-Büchi reaction of biomass cyclic ketone and cyclic alkene to synthesize a new kind of alkyl-substituted polycyclic hydrocarbon fuel with high energy density and good cryogenic *** triplet-energy-quenching results and phosphorescent emission spectra reveal the sensitization mechanism of the reaction,including photosensitizer excitation,triplettriplet energy transfer,cyclization,and relaxation,and the possible reaction path was revealed by the density functional theory(DFT)*** reaction conditions of photosensitizer type and addition,molar ratio of substrates,reaction temperature,and incident light intensity were optimized,with the target product yield achieving 65.5%.Moreover,the reaction dynamics of the reaction rate versus the light intensity are *** the hydrogenation-deoxygenation reaction,three fuels with a high density of 0.864-0.938 g·ml^(-1) and a low freezing point of<-55℃ are *** work provides a benign and effective approach to synthesize high-performance fuels.

关键词： High-energy-density fuel Transposed Patern-oeBüchi reaction Kinetics Bioenergy Photochemistry

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SARS的影像学动态随访(附15例报告)

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实用放射学杂志 2006年第5期22卷 540-542页

作者：范勇李萍刘钢程湘王继刚姜会生宛金戎崔军李龙天津市海河医院放射科天津市海河医院放射科天津300350

目的随访SARS患者肺部影像学表现。方法对15例SARS患者行7个月影像学动态检查并进行分析。结果螺旋CT病变检出率明显高于X线平片(t=5.5228,P<0.01)和普通CT(t=2.5888,P<0.01)。渗出性病变在2个月后仍见缓慢吸收。15例患者中,13例在CT上... 详细信息

目的随访SARS患者肺部影像学表现。方法对15例SARS患者行7个月影像学动态检查并进行分析。结果螺旋CT病变检出率明显高于X线平片(t=5.5228,P<0.01)和普通CT(t=2.5888,P<0.01)。渗出性病变在2个月后仍见缓慢吸收。15例患者中,13例在CT上见残留病变,主要表现为磨玻璃样阴影,HRCT表现为细网状阴影。多位于双侧(10/13)和下叶(11/13)。结论SARS的影像学随访应首选螺旋CT结合HRCT,发病2个月后渗出病变基本吸收,残留病变吸收缓慢。

关键词：胸严重急性呼吸综合征 X线摄影术体层摄影术,X线计算机

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