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A ternary mechanism for the facilitated transfer of metal ions onto metal–organic frameworks: implications for the "versatility" of these materials as solid sorbents

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Frontiers of Chemical Science and Engineering 2022年第11期16卷 1632-1642页

作者： Xiyuan Bu Ming Tian HONGQING WANG Lin wang Liyong Yuan Weiqun Shi Laboratory of Nuclear Energy Chemistry Institute of High Energy PhysicsChinese Academy of SciencesBeijing 100049China School of Chemistry and Chemical Engineering University of South ChinaHengyang 421001China

Although metal–organic frameworks offer a new platform for developing versatile sorption materials,yet coordinating the functionality,structure and component of these materials remains a great challenge.It depends on a comprehensive knowledge of a“real sorption mechanism”.Herein,a ternary mechanism for U(Ⅵ)uptake in metal–organic frameworks was reported.Analogous MIL-100s(Al,Fe,Cr)were prepared and studied for their ability to sequestrate U(Ⅵ)from aqueous solutions.As a result,MIL-100(Al)performed the best among the tested materials,and MIL-100(Cr)performed the worst.The nuclear magnetic resonance technique combined with energy-dispersive X-ray spectroscopy and zeta potential measurement reveal that U(Ⅵ)uptake in the three metal–organic frameworks involves different mechanisms.Specifically,hydrated uranyl ions form outer-sphere complexes in the surface of MIL-100s(Al,Fe)by exchanging with hydrogen ions of terminal hydroxyl groups(Al-OH_(2),Fe-OH_(2)),and/or,hydrated uranyl ions are bound directly to Al(Ⅲ)center in MIL-100(Al)through a strong inner-sphere coordination.For MIL-100(Cr),however,the U(Ⅵ)uptake is attributed to electrostatic attraction.Besides,the sorption mechanism is also pH and ionic strength dependent.The present study suggests that changing metal center of metal–organic frameworks and sorption conditions alters sorption mechanism,which helps to construct effective metal–organic frameworks-based sorbents for water purification.

关键词： U(Ⅵ) metal–organic frameworks adsorption mechanism metal node

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Enhanced low-humidity performance of proton-exchange membrane fuel cell by introducing hydrophilic CNTs in membrane electrode assembly

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Progress in Natural Science:Materials International 2022年第2期32卷 150-156页

作者： Sanying Hou HONGQING WANG Jianwei Ren Chen Yao Lang Shi Shijun Liao School of Chemistry and Chemical Engineering University of South China Energy Centre Council for Scientific and Industrial Research (CSIR) School of Chemistry and Chemical Engineering South China University of Technology

Hydrophilic carbon nanotubes(HCNTs) were introduced into the membrane electrode assembly(MEA) to improve its low-humidity performance.The effects of types,placement,loading,and relative humidity on the MEA performance were investigated.It has been found that the MEA with 20 wt% HCNTs loading both in anode and cathode achieved the best self-humidifying performance.Its current density reached 1550 mA cm-2at 0.6 V,with a maximum power density of 953 mW/cm~2 at 70℃,30 psi and 30% relative humidity conditions.Besides,the stability test shows that its current density at 0.6 V only decreased by 6.4% after 44 h performance test,while the performance of blank MEA without HCNTs decreased by 45% within 6 h testing period.This extraordinary performance under low humidity condition is ascribed to that the HCNTs contained in the MEA improve the water management and mass transportation by functioning as a dispersant and hydrophilic agent.

关键词： Membrane electrode assembly Low humidity Carbon nanotubes Power density Stability

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Study on primal CO gas generation and emission of coal seam

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International Journal of Mining Science and Technology 2017年第6期27卷 973-979页

作者： Zhu hongqing Chang Mingran wang Haiyan College of Resource and Safety Engineering China University of Mining & Technology Beijing Beijing 100083 China China Coal Research Institute Beijing 100013 China

The main method of casting coal spontaneous combustion is prediction of index gases, with carbon monoxide(CO) commonly used as an index gas. However, coal spontaneous combustion is not the sole source of CO evolution; primal CO is generated through coalification, which can lead to forecasting mistakes. Through theoretical analysis, primal CO generation and emission from coal seams was determined.In this study, six coal samples were analyzed under six different experimental conditions. The results demonstrated the change in coal seam primal gas and concentration as functions of time, different coal samples, occurrence, various gas types and composition concentration, which are in agreement with the previous study on primal CO generation. Air charging impacts on primal gas emission. Analysis of the experimental data with SPSS demonstrates that the relationship between primal CO concentration and time shows a power exponent distribution.

关键词： Primal CO Prediction of spontaneous combustion Emission regularity CO generation mechanism Index gas

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Effect of strawberry vein banding virus and strawberry mottle virus co-infection on the growth and development of strawberry

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BIOCELL 2022年第1期46卷 263-273页

作者： LINGJIAO FAN DAN SONG YINGWEI KHOO MENGMENG WU TENGFEI XU XIAOLI ZHAO HONGQING WANG College of Horticulture China Agricultural UniversityBeijing100193China State Key Laboratory of Biology of Plant Diseases and Insect Pests Institute of Plant ProtectionChinese Academy of Agricultural SciencesBeijing100193China

Strawberry mottle virus(SMoV)and strawberry vein banding virus(SVBV)cause diseases on strawberry plants,but the effect of coinfection of SMoV and SVBV on the growth,development,and defense system of strawberry(Fragaria×ananassa Duchesne)remains unknown.We investigated the effect of SMoV and SVBV coinfection on strawberry cultivar‘Benihope’.The results showed that stem diameter,leaf size,leaf number,relative chlorophyll content,total chlorophyll content,photosynthetic parameters,and stomatal aperture of SMoV and SVBV co-infected strawberry(VIS)plants were in a weaker level than uninfected control plants,indicating that viruses inhibited the growth and photosynthesis of strawberry plants.Furthermore,the initiation of flowering and fruiting stages of VIS plants were delayed by about three weeks compared with the controls,and the fruiting period was shortened,demonstrating that the reproduction of VIS plants was inhibited.Fruit quality was damaged in VIS plants due to a significant increase in fruit firmness and titratable acidity and decrease in total soluble solid content than control fruits.More dead cells and H_(2)O_(2) accumulated along the veins of VIS leaves,and the content of abscisic acid and catalase activity significantly increased,whereas anthocyanin content was lower than that of control plants.The results demonstrate that SVBV and SMoV coinfection inhibits the growth and development of‘Benihope’strawberry plants,and the plants respond to viruses by regulating stomatal aperture,the accumulation of ABA and antioxidants.To our knowledge,this study contributes information to understand how both viruses impair the strawberry growth and development for the first time.

关键词： Photosynthesis Flowering and fruiting period Antioxidants Plant defense

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Flavanols from the Camellia sinensis var.assamica and their hypoglycemic and hypolipidemic activities

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Acta Pharmaceutica Sinica B 2017年第3期7卷 342-346页

作者： Xin wang Quan Liu Hongbo Zhu HONGQING WANG Jie Kang Zhufang Shen Ruoyun Chen State Key Laboratory of Bioactive Substance and Function of Natural Medicines Institute of Materia MedicaChinese Academy of Medical Sciences and Peking Union Medical CollegeBeijing 100050China

α-Glucosidase and lipase inhibitors play important roles in the treatment of hyperglycaemia and dyslipidemia. To identify novel naturally occurring inhibitors, a bioactivity-guided phytochemical research was performed on the pu-erh tea. One new flavanol, named(–)-epicatechin-3-O-(Z)-coumarate(1), and 16 known analogs(2–17) were isolated from the aqueous extract of the pu-erh tea. Their structures were determined by spectroscopic and chemical methods. Furthermore, the water extract of pu-erh tea and its fractions exhibited inhibitory activities against α-glucosidases and lipases in vitro;compound 15 showed moderate inhibitory effect against sucrase with an IC_(50) value of 32.5 μmol/L and significant inhibitory effect against maltase with an IC_(50) value of 1.3 μmol/L. Compounds 8, 10, 11 and15 displayed moderate activity against a lipase with IC_(50) values of 16.0, 13.6, 19.8, and 13.3 μmol/L,respectively.

关键词： Camellia sinensis var. assamica Pu-erh tea Flavanol Hypoglycemic Hypolipidemic

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One-pot synthesis of arginine modified hydroxyapatite carbon microsphere composites for efficient removal of U(Ⅵ) from aqueous solutions

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Science Bulletin 2017年第23期62卷 1609-1618页

作者： Dongxu Yang Xiangxue wang Gang Song Guixia Zhao Zhe Chen Shujun Yu Pengcheng Gu HONGQING WANG Xiangke wang College of Environmental Science and Engineering North China Electric Power University School of Chemistry and Chemical Engineering University of South China Guangdong Provincial Key Laboratory of Radionuclides Pollution Control and Resources Guangzhou University

Uranium was not only the main source of nuclear energy but also one of the long-lived radionuclide.Herein, a novel arginine modified hydroxyapatite carbon microsphere composites(defined as C@HAp/Arg) obtained promptly via a one-step mild hydrothermal method, was applied to remove U(Ⅵ) from aqueous solutions. Based on the characterization of transmission electron microscopy(TEM), scanning electron microscopy(SEM), Fourier transformed infrared spectroscopy(FT-IR), X-ray diffraction(XRD)and X-ray photoelectron spectroscopy(XPS), the synthesized C@HAp/Arg presented globular morphology and abundant functional groups(e.g., —COO^-), which were beneficial to its combination with U(Ⅵ). The interaction mechanism and removal capability of U(Ⅵ) on C@HAp/Arg were studied by batch adsorption technique and spectroscopy analysis. The results implied that U(Ⅵ) can form strong surface complexes on C@HAp/Arg. The kinetics adsorption of U(Ⅵ) followed pseudo-second-order kinetic model with high removal efficiency($95% within 5h at pH 5.0). The adsorption isotherms were well fitted by Langmuir model, implying that U(Ⅵ) uptake on C@HAp/Arg was monolayer coverage. It was found that the maximum adsorption capacities of CSs, C@HAp and C@HAp/Arg toward U(Ⅵ) were calculated to be 23.16,72.09 and 569.66 mg/g, respectively, at 298.15 K and pH 5.0, and thermodynamic parameters revealed that the adsorption processes of U(Ⅵ) were spontaneous and endothermic. In addition, effect of co-existed ions and CO_3^(2-)concentrations demonstrated that U(Ⅵ) adsorption on C@HAp/Arg was weakly interfered by foreign ions and carbonate concentrations. More importantly, the adsorption performance of U(Ⅵ) on C@HAp/Arg was still over $87% after five cycles. Therefore, it was noted that the versatile C@HAp/Arg could be potentially used as a powerful building block for the enrichment and disposal of U(Ⅵ) from aqueous solutions, which could efficiently reduce the potential toxicity of U(Ⅵ) in the U(Ⅵ)-contaminated water.

关键词： U(Ⅵ) C@HAp/Arg composites Interaction mechanism Adsorption

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Design and simulation analysis of high-temperature heat-storage combined-circulation system

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Clean Energy 2022年第1期6卷 77-88页

作者： Hongwei Zhang Junqing Liu Wenbin Liang hongqing Shanand Jie wang National Institute of Clean and Low Carbon Energy Changping DistrictBeijing 102211China Institute of Nuclear and New Energy Technology Tsinghua UniversityBeijing 10084China

In view of the continuous increase in the proportion of renewable energy connected to the grid in China and the increasing peak-to-valley difference in electricity demand on the power grid,this paper proposes a high-temperature thermal-storage combined-cycle power-generation system.Using Thermoflex thermal simulation analysis software,a high-temperature thermal-storage combined-cycle simulation analysis system model was established,and the influence of different initial temperatures and pressure ratios on the combined-cycle system was analysed.Sensitivity analysis of factors such as electricity cost,annual operating hours,initial equipment investment,unit efficiency and other factors that affect the net income of the system was carried out.According to the current power-peak-shaving auxiliary service market in China,it is pointed out that high-temperature thermal-storage combined-cycle projects must be profitable and obtain good economic benefits.The results obtained,on the one hand,provide suggestions for the flexibility and transformation of current gas-fired steam generators for peak shaving and,on the other hand,provide references for the subsequent development of high-temperature thermal-storage combined-cycle demonstration projects.

关键词： high temperature thermal-energy storage combined cycle economy

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Magnetic resonance perfusion imaging evaluation in perfusion abnormalities of the cerebellum after supratentorial unilateral hyperacute cerebral infarction

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Neural Regeneration Research 2012年第12期7卷 906-911页

作者： Pan Liang Yunjun Yang Weijian Chen Yuxia Duan HONGQING WANG Xiaotong wang Department of Radiology First Affiliated Hospital of Wenzhou Medical College Wenzhou 325000 Zhejiang Province China Second Affiliated Hospital of Wenzhou Medical College Wenzhou 325000 Zhejiang Province China

Magnetic resonance imaging （MRI） data of 10 patients with hyperacute cerebral infarction （≤6 hours） were retrospectively analyzed.Six patients exhibited perfusion defects on negative enhancement integral maps,four patients exhibited perfusion differences in pseudo-color on mean time to enhance maps,and three patients exhibited perfusion differences in pseudo-color on time to minimum maps.Dynamic susceptibility contrast-enhanced perfusion weighted imaging revealed a significant increase in region negative enhancement integral in the affected hemisphere of patients with cerebral infarction.The results suggest that dynamic susceptibility contrast-enhanced perfusion weighted imaging can clearly detect perfusion abnormalities in the cerebellum after unilateral hyperacute cerebral infarction.

关键词： magnetic resonance imaging magnetic resonance-perfusion-weighted imaging cerebral infarction cerebral perfusion functional neurological deficit

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A Study for the Influence of the Location of PCMs Assembly System on Improving Thermal Environment inside Disaster-Relief Temporary Houses

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Journal of Renewable Materials 2021年第7期9卷 1239-1252页

作者： Caixia wang Xiao Huang hongqing Chena Weijie Liang State Key Laboratory of Geomechanics and Geotechnical Engineering Institute of Rock and Soil MechanicsChinese Academy of SciencesWuhan430061China Institute for Disaster Management and Reconstruction Sichuan UniversityChengdu610041China

Currently,people pay more and more attention to the transitional resettlement of victims after various natural disasters.There is an urgent need for a large number of temporary houses to resettle the victims after natural disasters.Disaster-relief temporary houses(DTHs)played an important role in the post-disaster resettlement in the past,which can not only be produced on a large scale,but also can be quickly and conveniently erected,which were the main means to solve the problem of transitional resettlement.However,due to their temporary nature,there was no extra energy consuming system installed in the DTHs generally.Hence the indoor thermal environment inside the DTHs was severe in summer.In this study,combined with the field experimental tests of the DTHs in Wenchuan Earthquake and Lushan Earthquake and the experimental study of the full-size DTH,it found that the thermal environment inside the DTH was intolerably high in summer.It had negative impact on victims.In order to improve the thermal environment inside DTHs during post-disaster period which lacked of extra energy resources,this study used the method of combining phase change materials(PCMs)with walls of the DTH to explore its feasibility and effectiveness.The results showed that PCMs could effectively improve the thermal environment inside the DTH in summer.Furthermore,the difference of the composite positions between PCMs and the wall affected the improvement effect.The energy release rate of the PCMs assembly system(PAS)varied according to the positions of the PCMs.

关键词： Disaster-relief temporary houses(DTHs) phase change materials(PCMs) indoor thermal environment

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Application of graphene oxides and graphene oxide-based nanomaterials in radionuclide removal from aqueous solutions

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Science Bulletin 2016年第20期61卷 1583-1593页

作者： Xiangxue wang Shujun Yu Jie Jin HONGQING WANG Njud S. Alharbi Ahmed Alsaedi Tasawar Hayat Xiangke wang School of Environment and Chemical Engineering North China Electric Power University Beijing 102206 China School of Chemistry and Chemical Engineering University of South China Hengyang 421001 China Biotechnology Research Group Department of Biological Sciences Faculty of Science King Abdulaziz UniversityJeddah 21589 Saudi Arabia NAAM Research Group Faculty of Science King Abdulaziz University Jeddah 21589 Saudi Arabia

With the fast development of nanoscience and nanotechnology,the nanomaterials have attracted multidisciplinary interests.The high specific surface area and large numbers of oxygen-containing functional groups of graphene oxides(GOs) make them suitable in the preconcentration and solidification of radionuclides from wastewater.In this paper,mainly based on the recent work carried out in our laboratory,the efficient elimination of radionuclides using GOs and GO-based nanomaterials as adsorbents are summarized and the interaction mechanisms are discussed from the results of batch techniques,surface complexation modeling,spectroscopic analysis and theoretical calculations.This review is helpful for the understanding of the interactions of radionuclides with GOs and GO-based nanomaterials,which is also crucial for the application of GOs and GO-based nanomaterials in environmental radionuclide pollution management and also helpful in nuclear waste management.

关键词： Graphene oxides Radionuclides Sorption Interaction mechanism Theoretical calculation Spectroscopic analysis

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