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Vanadium(Ⅳ)solvent extraction enhancement in high acidity using di-(2-ethylhexyl)phosphoric acid with[Cl^(-)]present:an experimental and theoretical study

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Frontiers of Chemical science and engineering 2023年第1期17卷 56-67页

作者： Hong Liu Yi-Min Zhang Jing Huang Tao Liu School of Resource and environmental engineering Wuhan University of Science and TechnologyWuhan 430081China State environmental Protection Key Laboratory of Mineral Metallurgical Resources Utilization and Pollution Control Wuhan University of Science and TechnologyWuhan 430081China Hubei Collaborative Innovation center for High Efficient Utilization of Vanadium Resources Wuhan University of Science and TechnologyWuhan 430081China Hubei provincial engineering Technology Research center of High Efficient Cleaning Utilization for Shale Vanadium Resource Wuhan University of Science and TechnologyWuhan 430081China

Separation of vanadium from black shale leaching solution at low pH is very meaningful,which can effectively avoid the generation of alkali neutralization slag and the resulting vanadium *** this study,coordination mechanism of vanadium in acid leaching solution at low pH was investigated with the intervention of chloride *** the conditions of pH 0.8,di-(2-ethylhexyl)phosphoric acid concentration of 20%,phase ratio of 1:2,and extraction time of 8 min,the vanadium extraction could reach 80.00%.The Fourier transform infrared and electrospray ionization results reveal that,despite the fact that the chloride ion in the leachate could significantly promote vanadium extraction,the chloride ion does not enter the organic phase,indicating an intriguing *** Cl^(-)-V,SO_(4)^(2-)-V,and H_(2)O-V,the V-Cl bond is longer and the potential difference between coordinate ions and vanadium is ***,Vo^(2+)gets easily desorbed with chloride ions and enter the organic *** the same time,the hydrogen ions of di-(2-ethylhexyl)phosphoric acid also enter the water phase more easily,which reduces the pH required for the extraction reaction.

关键词： vanadium black shale solvent extraction high acidity extraction

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High efficient removal and mineralization of Cr(VI)from water by functionalized magnetic fungus nanocomposites

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Journal of Central South University 2020年第5期27卷 1503-1514页

作者： CHEN Run-hua CHENG Yu-ying WANG Ping LIU Zhi-ming WANG Yu-guang WANG Yang-yang College of environmental science and engineering Central South University of Forestry and TechnologyChangsha 410007China National demonstration center for environmental and Planning College of Environment&PlanningHenan UniversityKaifeng 475004China Department of Biology Eastern New Mexico UniversityPortalesNM88130USA School of Minerals Processing and Bioengineering Central South UniversityChangsha 410083China

A hydroxyl-functionalized magnetic fungus nanocomposite(MFH@GO)was prepared by a simple one-pot method for the removal of Cr(VI)from *** adsorption behavior of MFH@GO to Cr(VI)in wastewater was discussed in *** pH of 5.0 and temperature of 323.15 K,MFH@GO had higher adsorption capacity to Cr(VI)(58.4 mg/g)than the unmodified fungus and *** transform infrared spectroscopy(FTIR),X-ray diffraction(XRD),thermogravimetry and differential thermal analysis(TG-DTA),scanning electron microscopy and energy dispersive X-Ray spectroscopy(SEM-EDX)were employed to determine the characteristics of MFH@*** showed that magnetic graphene oxide nanoparticles significantly enhanced the physiochemical properties of the *** addition,the adsorption mechanisms analyses show that Cr(VI)could be reduced and mineralized into ferric chromate in *** results suggested that MFH@GO could be used as an promising and alternative biosorbent for removal of Cr(VI)from industrial wastewater.

关键词： wastewater Cr(VI) fungus nanocomposites biomineralization

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A five-parameter constitutive model for hysteresis shearing and energy dissipation of rock joints

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International Journal of Mining science and Technology 2022年第4期32卷 737-746页

作者： Yikun Li Tongbin Zhao Yifei Li Yang Chen College of Energy and Mining engineering Shandong University of Science and TechnologyQingdao 266590China State Key Laboratory of Mining Disaster Prevention and Control Cofounded by Shandong Province and the Ministry of science and Technology Shandong University of Science and TechnologyQingdao 266590China National demonstration center for experimental Mining engineering Education Shandong University of Science and TechnologyQingdao 266590China School of Civil and Transportation engineering Qinghai Nationalities UniversityXining 810007China Shandong Energy Group Co. Ltd.Jinan 250014China

Rock joints exhibit hysteresis shearing behavior and produce energy dissipation under shear cyclic loads,which however cannot be accurately depicted by existing constitutive models. This paper establishes a constitutive model for hysteresis shearing and associated energy dissipation of rock joints. Analytical expressions of the model during cyclic shearing processes are derived. Derivation of the model indicates no energy dissipation in the elastic stage. When the shear load exceeds elastic boundary, nonlinear energy dissipation takes place. Validations with experiments show that the proposed model provides good conformities with direct shear curves and hysteresis loops, and can predict the energy dissipation characteristics of rock joints under different working conditions. Compared to the constitutive models using Weibull's distribution, the proposed one is smooth at the elastic boundary and can accurately capture the maximum shear stress. Unlike the existing incremental-type models, the proposed one provides clear and direct analytical expressions for both shear stress and energy dissipation during the whole displacement domain, which is more convenient in application.

关键词： Iwan model Rock joint Cyclic shear Hysteresis Energy dissipation

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Transparent Photochromic Wood Composites Incorporating AgBr Nanoparticles for UV-shielding Applications

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Paper And Biomaterials 2021年第4期6卷 21-29页

作者： Cong Zhang Yujun Ma Tao Lin Xuefeng Yin Xiaoyao Wei Zhongxiang Wang National demonstration center for experimental Light Chemistry engineering Education Shaanxi Provincial Key Laboratory of Papermaking Technology and Specialty Paper DevelopmentKey Laboratory of Paper based Functional Materials of China National Light IndustryCollege of Bioresources Chemical and Materials EngineeringShaanxi University of Science&TechnologyXi'anShaanxi Province710021China

Transparent wood(TW)is a wood-based biomaterial with several advantages,such as high optical transmittance,low thermal conductivity,and tunable *** is functionalized according to its transparency to broaden its applications in different *** studies have examined wood functionalization in recent years;however,few studies have reported photochromic TW(PTW)for ultraviolet(UV)-shielding window ***,PTW was obtained by infiltrating the delignified wood template with photochromic silver bromide(AgBr)nanoparticles and a pre-polymerized methyl methacrylate(MMA)mixture *** obtained PTW can adjust the luminous flux on change in the color in the visible light *** photochromic properties were examined,and the optical properties of the composites were characterized using UV-Vis *** transmittance of PTW was up to 86.5%at 800 nm before UV irradiation,and it decreased to 70.1%at 800 nm after UV irradiation,as the wood color changed from colorless to dark purple under UV ***,this work not only achieves high-value utilization of wood,but also produces a new material that can be used in varied fields,such as UV-shielding,energy saving,and smart building.

关键词： transparent wood photochromic UV-shielding nanoparticles

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Washing-free chemiluminescence immunoassay for rapid detection of cardiac troponin Ⅰ in whole blood samples

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Chinese Chemical Letters 2022年第2期33卷 743-746页

作者： Huan Zhao Enben Su Li Huang Yunfeng Zai Yuan Liu Zhu Chen Song Li Lian Jin Yan Deng Nongyue He State Key Laboratory of Bioelectronics National Demonstration Center for Experimental Biomedical Engineering EducationSchool of Biological Science and Medical EngineeringSoutheast UniversityNanjing 210096China Getein Biotechnology Co. Ltd.Nanjing 210000China Hunan Key Laboratory of Biomedical Nanomaterials and Devices Hunan University of TechnologyZhuzhou 412007China

Chemiluminescence immunoassay(CLⅠA) has always been a great challenge in detecting cardiac troponin Ⅰ(c Tn Ⅰ) in whole blood samples without centrifugation because of the interference of red blood cells and low sensitivity. Ⅰn this study, the antigens and erythrocytes in the blood were captured by the antibodies immobilized on the magnetic particles, recognized by another biotinconjugated c Tn Ⅰ antibody and detected by streptavidin/acridine aster-conjugated polychloromethylstyrene microspheres(PCMS). After magnetic separation, the supernatant was transferred and measured. No significant difference was noted between the c Tn Ⅰ concentrations of the serum samples,plasma samples and whole blood. The prepared PCMS provided more functional areas to conjugate streptavidin and acridinium ester, so the immunoassay has highly sensitive, the limits of blank at0.012 ng/mL, and functional sensitivity at 0.019 ng/mL with a CV of 20%, and 0.058 ng/mL with a CV of 10%. Total precision of any sample type ranged from 2.62%~5.67%. The assay was linear over the studied range of 0.01-50.00 ng/mL, and no hook effect was found when c Tn Ⅰ concentrations reached 1900 ng/mL. No significant interference was noted with the potential endogenous interfering substances. Compared with the commercial kit(Abbott assay kit), the correlation coefficient was 0.9859. A washing-free CLⅠA was established for the rapid detection of c Tn Ⅰ in human whole blood, using erythrocyte capture antibodies-conjugated magnetic nanoparticles for eliminating the influence of erythrocytes and PCMS for signal amplification, which showed great potential in clinical application.

关键词： Washing-free Whole blood Chemiluminescence immunoassay Polychloromethylstyrene microspheres

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A microfluidic device for accurate detection of hs-cTnI

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Chinese Chemical Letters 2021年第4期32卷 1555-1558页

作者： Li Huang Enben Su Yuan Liu Nongyue He Yan Deng Lian Jin Zhu Chen Song Li State Key Laboratory of Bioelectronics National Demonstration Center for Experimental Biomedical Engineering EducationSchool of Biological Science and Medical EngineeringSoutheast UniversityNanjing 210096China Getein Biotechnology Co. Ltd.Nanjing 210000China Hunan Key Laboratory of Biomedical Nanomaterials and Devices Hunan University of TechnologyZhuzhou 412007China

This device is aimed at ensuring that the sample is uniformly and equivalently reacted with the antibody on the NC membrane in each test when the microfluidic liquid system is introduced to the *** this study,the developed microfluidic chip can avoid the presence of the sample and conjugate pads in the chip,while the precision of the chro matography system can be greatly improved using the same particles,NC membrane and antibody alongside the traditional *** results,taking the detection of cTnI as an example,revealed that the coefficient of variation(CV)is controlled within 4%,while the maximum record of the contrast chromatographic reagent strip can reach 15%.Additionally,the detection sensitivity can maintain the same order of magnitudes with that of the traditional chromatographic *** the results,the determination correlation of the developed microfluidic chip has been greatly *** addition,the CV of the chip in this study is greatly improved in comparison with that of the traditional *** biggest improvement lies in the mixing between the sample and the microspheres,indicating that this is a new approach to improve the CV of the traditional strip.

关键词： Point of care testing hs-cTnI Microfluidic device Precision

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Modal parameter determination and chatter prediction for blade whirling: a comparative study based on symmetric and asymmetric FRF

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Advances in Manufacturing 2021年第1期9卷 145-159页

作者： Lu-Yi Han Ri-Liang Liu Xin-Feng Liu School of Mechanical engineering Shandong UniversityJinan 250061People's Republic of China Key Laboratory of High Efficiency and Clean Mechanical Manufacture Shandong UniversityJinan 250061People's Republic of China National demonstration center for experimental Mechanical engineering Education Shandong UniversityJinan 250061People's Republic of China

Whirling has been adopted for the cost-effective machining of blade-shape components in addition to traditional end milling and flank milling *** satisfy the requirements of rotary forming in the blade whirling process,the workpiece must be clamped at both ends in suspension and rotated slowly during machining,which complicates the *** study aims to identify the dynamic characteristics within the blade whirling operation and present strategies for stability *** this study,the dynamic characteristics of a whirling system are modeled by assuming symmetric and asymmetric *** prediction frequency response function(FRF)results are compared with experimental ***,semi-discretization stability lobe diagrams(SLDs)obtained using the dynamic parameters of these models are investigated *** results show that the asymmetric model is more suitable for describing the whirling system,whereas the symmetric model presents limitations associated with the frequency range and location of measuring ***,a set of airfoil propeller blade whirling operations is conducted to verify the prediction accuracy.

关键词： Whirling Asymmetric frequency response function(FRF) Stability lobe diagrams(SLD) Semi-discretization method

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Moisture-preventing MAPbI_(3) solar cells with high photovoltaic performance via multiple ligand engineering

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Nano Research 2022年第2期15卷 1375-1382页

作者： Xin Li Jinyue Du Hui Duan Haoyan Wang Lin Fan Yunfei Sun Yingrui Sui Jinghai Yang Fengyou Wang Lili Yang Key Laboratory of Functional Materials Physics and Chemistry of the Ministry of Education Jilin Normal UniversityChangchun 130103China National demonstration center for experimental Physics Education Jilin Normal UniversitySiping 136000China Key Laboratory of Preparation and Application of environmental Friendly Materials Ministry of EducationJilin Normal UniversityChangchun 130103China

Perovskite solar cells present one of the most prominent photovoltaic technologies,yet their stability,and engineering at the molecular level remain *** have demonstrated multifunctional molecules to improve the operating stability of perovskite solar cells while depicting a high-power conversion *** multifunctional molecule 4-[(trifluoromethyl)sulphanyl]-aniline(4TA)with trifluoromethyl(-CF_(3))and aniline(-NH_(2))moieties is meticulously designed to modulate the ***-CF_(3) and-NH_(2) functional groups have strong interaction with perovskite to suppress surface defects to improve device stability,as well as obtain large crystal grains through delaying ***,this-CF_(3) forms a hydrophobic barrier on the surface of the perovskite to prevent cell ***,the performance of the perovskite solar cells is remarkably improved with the efficiency increased from 18.00% to 20.24%.The perovskite solar cells with multifunctional molecular maintaining 93% of their original efficiency for over 30 days(-55%humidity)in air without device encapsulation,exhibiting a high long-term ***,the lead leakage issue of perovskite solar cells has also been suppressed by the built-in 4TA molecule,which is beneficial to environment-friendly ***,we believe this multifunctional small molecule provides an available way to achieve high performance perovskite solar cells and the related design strategy is helpful to further develop more versatile materials for perovskite-based optoelectronic devices.

关键词： stability high-power conversion efficiency perovskite solar cells hydrophobic barrier

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In-situ reduction synthesis of manganese dioxide@polypyrrole core/shell nanomaterial for highly efficient enrichment of U(Ⅵ) and Eu(Ⅲ)

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science China Chemistry 2018年第7期61卷 812-823页

作者： Wen Yao Yihan Wu Hongwei Pang Xiangxue Wang Shujun Yu Xiangke Wang College of environmental science and engineering North China Electric Power University Department of environmental science and engineering North China Electric Power University Collaborative Innovation center of Radiation Medicine of Jiangsu Higher Education Institutions and School for Radiological and Interdisciplinary sciences Soochow University

Radionuclides with long half-life are toxic,and thereby result in serious threat to human beings and ecological ***,a simple two-step synthesis method was used to prepare manganese dioxide@polypyrrole（Mn O2@PPy）core/shell structures for efficient removal of U（Ⅵ）and Eu（Ⅲ）from aqueous *** adsorption of U（Ⅵ）and Eu（Ⅲ）were investigated under different kinds of experimental *** experimental results suggested that the adsorption of U（Ⅵ）and Eu（Ⅲ）on Mn O2@PPy were greatly affected by p H.U（Ⅵ）adsorption on Mn O2@PPy was independent of ionic strength at p ***,Eu（Ⅲ）adsorption on Mn O2@PPy was independent of ionic strength at the whole p H range of experimental *** maximum adsorption capacities（q（max））of U（Ⅵ）and Eu（Ⅲ）were 63.04 and54.74 mg g（-1）at T=298 K,*** BET,XRD,FTIR and XPS analysis evidenced that high adsorption capacities of U（Ⅵ）and Eu（Ⅲ）on Mn O2@PPy were mainly due to high surface area and rich metal oxygen-containing group（i.e.,Mn–OH and Mn–O）,and the interaction was mainly attributed to strong surface complexation and electrostatic *** study highlighted the excellent adsorption performance of U（Ⅵ）and Eu（Ⅲ）on Mn O2@PPy and could provide the reference for the elimination of radionuclides in real wastewater management.

关键词： radionuclides manganese dioxide polypyrrole adsorption interaction mechanism

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Removal of tetracycline from water by Fe-Mn binary oxide

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Journal of environmental sciences 2012年第2期24卷 242-247页

作者： Huijuan Liu Yang Yang Jin Kang Maohong Fan Jiuhui Qu State Key Laboratory of environmental Aquatic Chemistry Research Center for Eco-Environmental Sciences Chinese Academy of Sciences Beijing 100085 China Graduate University Of Chinese Academy of sciences BeOing 100039 China Hubei provincial Research Institute of environmental science Wuhan 430072 China School of Energy Resources ＆ Department of Chemical ＆ Petroleum engineering University of V~oming Laramie WY 82071 USA

Significant concerns have been raised over the presence of antibiotics including tetracyclines in aquatic environments.A series of FeMn binary oxide with different Fe：Mn molar ratios was synthesized by a simultaneous oxidation and coprecipitation process for TC *** showed that Fe-Mn binary oxide had higher removal efficiency than that of hydrous iron oxide and hydrous manganese oxide,and that the oxide with a Fe：Mn molar ratio of 5：1 was the best in removal than other molar *** tetracycline removal was highly pH *** removal of tetracycline decreased with the increase of initial concentration,but the absolute removal quantity was more at high *** presence of cations and anions such as Ca2＋,Mg2＋,CO32-and SO42-had no significant effect on the tetracycline removal in our experimental conditions,while SiO32-and PO43-had hindered the adsorption of *** mechanism investigation found that tetracycline removal was mainly achieved by the replacement of surface hydroxyl groups by the tetracycline species and formation of surface complexes at the water/oxide *** primary study suggests that Fe-Mn binary oxide with a proper Fe：Mn molar ratio will be a very promising material for the removal of tetracycline from aqueous solutions.

关键词： Fe-Mn binary oxide tetracycline abatement and removal water treatment

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