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Efficient removal of natural organo-chromium(Ⅲ)through selfcirculating decomplex and immobilization with nanoscale zerovalent iron

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Nano Research 2024年第1期17卷 364-371页

作者： Zhicheng Dong Yunyun Xu Can Wu Jin Chao Chen Tian Zhang Lin School of Metallurgy and Environment Central South UniversityChangsha 410083China Chinese National Engineering Research Center for Control&Treatment of Heavy Metal Pollution Changsha 410083China College of Ecology and Environment Chengdu University of TechnologyChengdu 610059China School of Environment and Energy The Key Laboratory of Pollution Control and Ecosystem Restoration in Industry Clusters(Ministry of Education)South China University of TechnologyGuangzhou 510006China

Organo-chromium(III)complex is one of the chromium contaminant species,which would transform to high-toxic Cr(VI)during migrating in the environment.Such natural organo-chromium(III)(NOCr)is difficult to remove by traditional degradation or precipitation methods,due to its high stability and solubility.Herein,we demonstrated a novel NOCr removing method by transforming it to certain structures similar to Cr-Fe minerals in nature,through a self-circulating decomplex and immobilization mechanism with nano zero-valent iron(nZVI).Taking chromium glycinate(Cr-Gly)as a probe,nZVI showed a high Cr removal efficiency of 99.4%under ambient conditions.The removal process included three stages of adsorption,decomplexation,and re-immobilization.Cr-Gly was first adsorbed on the surface of nZVI by chemisorption of the oxide shell.Then,the adsorbed Cr-Gly was decomplexed and oxidized to Cr(VI)by·OH and 1O_(2),which were generated from molecular oxygen activated by nZVI.Meanwhile,the released Cr(VI)could be in-situ adsorbed and re-reduced to Cr(III),which was further immobilized in form of Cr-O-Fe complex.As the Cr-O-Fe complexing structure was similar to that of Cr-Fe minerals(such as chromohercynite)in nature,this work explored a novel and efficient NOCr removing method that was potential to weaken chromium pollution in the environment.

关键词： organo-chromium(III) zero-valent iron adsorption decomplexation Cr immobilization

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Enhanced adsorption of arsenate by spinel zinc ferrite nano particles: Effect of zinc content and site occupation

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Journal of Environmental Sciences 2019年第5期31卷 248-255页

作者： Can Wu Yunyun Xu Si xu Jingwei Tu Chen Tian Zhang Lin School of Environment and Energy The Key Laboratory of Pollution Control and Ecosystem Restoration in Industry Clusters (Ministry of Education) South China University of Technology Guangdong Engineering and Technology Research Center for Environmental Nanomaterials South China University of Technology

In this work, zinc ferrite spinel with different zinc contents(ZnxFe_3-xO_4) was synthesized by a hydrothermal method and used for removing As(V) in aqueous solution. X-ray diffraction(XRD) results indicated that in the crystal structure of ZnxFe_3-xO_4, the zinc atoms tended to occupy the octahedral sites for x 0.6. The size of ZnxFe_3-xO_4 crystallites increased with the increasing zinc content. Batch adsorption experiments showed that the adsorption isotherms could be well described by the Langmuir model, while the adsorption kinetics followed the pseudo-second-order kinetic model. Zinc ferrite exhibited the highest adsorption capacity towards As(V) when x = 0.6. Study of the mechanism indicated that doping with zinc increased the number of surface hydroxyl groups on ferrite spinel, and thus enhanced the adsorption capacity when x = 0.6. This work revealed the effects of doping site and content of metal atoms on the adsorption ability of ferrite spinel towards As(V).

关键词： Zinc ferrite Arsenate Adsorption Atom occupancy Hydroxyl groups

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A primal perspective for indefinite kernel SVM problem

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Frontiers of Computer Science 2020年第2期14卷 349-363页

作者： Hui xuE Haiming xu Xiaohong CHEN yunyun WANG School of Computer Science and Engineering Southeast UniversityNanjing 210096China Key Laboratory of Computer Network and Information Integration(Southeast University) MOENanjing 210096China College of Science Nanjing University of Aeronautics and AstronauticsNanjing 210016China School of Computer Science Nanjing University of Posts and TelecommunicationsNanjing 210046China

Indefinite kernel support vector machine(IKSVM)has recently attracted increasing attentions in machine learning.Since IKSVM essentially is a non-convex problem,existing algorithms either change the spectrum of indefinite kernel directly but risking losing some valuable information or solve the dual form of IKSVM whereas suffering from a dual gap problem.In this paper,we propose a primal perspective for solving the problem.That is,we directly focus on the primal form of IKSVM and present a novel algorithm termed as IKSVM-DC for binary and multi-class classification.Concretely,according to the characteristics of the spectrum for the indefinite kernel matrix,IKSVM-DC decomposes the primal function into the subtraction of two convex functions as a difference of convex functions(DC)programming.To accelerate convergence rate,IKSVM-DC combines the classical DC algorithm with a line search step along the descent direction at each iteration.Furthermore,we construct a multi-class IKSVM model which can classify multiple classes in a unified form.A theoretical analysis is then presented to validate that IKSVM-DC can converge to a local minimum.Finally,we conduct experiments on both binary and multi-class datasets and the experimental results show that IKSVM-DC is superior to other state-of-the-art IKSVM algorithms.

关键词： indefinite kernel support vector machine multi-class classification non-convex optimization

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Single atom site conjugated copper polyphthalocyanine assisted carbon nanotubes as cathode for reversible Li-CO_(2) batteries

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Nano Research 2022年第5期15卷 4100-4107页

作者： Yunyun Xu Cheng Jiang Hao Gong Hairong xue Bin Gao Peng Li Kun Chang Xianli Huang Tao Wang Jianping He College of Materials Science and Technology Jiangsu Key Laboratory of Electrochemical Energy Storage TechnologiesNanjing University of Aeronautics and AstronauticsNanjing 210016China Department of Chemistry and Materials Science College of ScienceNanjing Forestry UniversityNanjing 210037China

Recently,Li-CO_(2) battery has gradually become a research hotspot due to its high discharge capacity,energy density and environmental benefits.However,it has been an important problem for researchers because of its slow decomposition kinetics and difficult to generalize to practical application.Herein,we prepared copper polyphthalocyanine-carbon nanotubes composites(CuPPc-CNTs)by solvothermal in-situ polymerization of copper phthalocyanine on the surface of carbon nanotubes as cathode for reversible Li-CO_(2) batteries,which exhibits a high discharge capacity of 18,652.7 mAh·g^(-1) at current density of 100 mA·g^(-1),1.64 V polarization at 1,000 mA·g^(-1),and a stable cycles number of 160 is close to 1,630 h of charge-discharge process at 200 mA·g^(-1).Copper polyphthalocyanine has highly efficient copper single-atom catalytic sites with excellent CO_(2) adsorption and activation,while carbon nanotubes provide a conductive network.The synergistic effect of the two compounds enables it to have excellent catalytic activity.The density functional theory(DFT)calculation proved that the addition of copper polyphthalocyanine significantly improved the CO_(2) adsorption and activation process.This study provides an opportunity for the research of covalent organic polymers(COPs)single-atom catalyst in Li-CO_(2) battery field.

关键词： copper polyphthalocyanine carbon nanotubes CO_(2)adsorption reversible Li-CO_(2) batteries

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Recent advances of multimoda ultrasound in image-guided prostate-targeted biopsy

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Journal of Interventional Medicine 2022年第3期5卷 117-121页

作者： yunyun Liu Lihua Xiang Guang xu Yifeng Zhang Huixiong xu Center of Minimally Invasive Treatment for Tumor Department of Medical UltrasoundShanghai Tenth People's HospitalSchool of MedicineTongji UniversityShanghai200072China Ultrasound Research and Education Institute Clinical Research Center for Interventional MedicineSchool of MedicineTongji UniversityShanghai200072China Shanghai Engineering Research Center of Ultrasound Diagnosis and Treatment Shanghai200072China National Clinical Research Center for Interventional Medicine Shanghai200072China Department of Ultrasound Zhongshan HospitalFudan UniversityShanghai200032China

Prostate-targeted biopsy is usually the preferred method over systematic biopsy because it can effectively detect prostate cancer using only a few puncture cores with fewer complications.With the development of ultrasound,it has gained multimodal technological upgrades,such as the emergence of contrast-enhanced ultrasound,ultrasound elastography,and three-dimensional ultrasonography.Moreover,multimodal ultrasound has played an increasingly significant role in prostate-targeted biopsies.

关键词： Prostate Targeted biopsy Ultrasound

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Advances in the knowledge on the role of apoptosis repressor with caspase recruitment domain in hemorrhagic stroke

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Journal of Intensive Medicine 2023年第2期3卷 138-143页

作者： xu Pei Mi Tian Yao Wang Yuewen Xin Junliang Jiang yunyun Wang Ye Gong Department of Critical Care Medicine Huashan HospitalFudan UniversityShanghai 200040China Department of Neurosurgery Huashan HospitalFudan UniversityShanghai 200040China

The apoptosis repressor with caspase recruitment domain(ARC)plays a critical role in extrinsic apoptosis initiation via death receptor ligands,physiological stress,infection response in a tissue-dependent manner,endoplasmic reticulum(ER)stress,genotoxic drugs,ionizing radiation,oxidative stress,and hypoxia.Recent studies have suggested that regulating apoptosis-related pathways can improve outcomes for patients with neurological diseases,such as hemorrhagic stroke.ARC expression is significantly correlated with acute cerebral hemorrhage.However,the mechanism by which it mediates the anti-apoptosis pathway remains poorly known.Here,we discuss the function of ARC in hemorrhagic stroke and argue that it could serve as an effective target for the treatment of hemorrhagic stroke.

关键词： Apoptosis repressor with caspase recruitment domain(ARC) Hemorrhagic stroke Neuroinflammation Neuronal apoptosis

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Recent advances in the study of sepsis-induced depression

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Journal of Intensive Medicine 2023年第3期3卷 239-243页

作者： yunyun Wang Youjia Zhu Mi Tian Yao Wang xu Pei Junliang Jiang Yu He Ye Gong Department of Critical Care Medicine and Neurosurgery of Huashan Hospital State Key Laboratory of Medical Neurobiology and MOE Frontiers Center for BrainScienceInstitutes of Brain ScienceFudan UniversityShanghai 200000China

Progress in medicine such as the use of anti-infective drugs and development of the advanced life support equipment has greatly improved the survival rate of patients with sepsis.However,the incidence of sepsis-relateddiseases is increasing.These include severe neurologic and psychologic disorders,cognitive decline,anxiety,depression,and post-traumatic stress disorder.Cerebral dysfunction occurs via multiple interacting mechanisms,with different causative pathogens having distinct effects.Because sepsis-related diseases place a substantial burden on patients and their families,it is important to elucidate the underlying pathophysiologic mechanisms todevelop effective treatments.

关键词： Sepsis Sepsis-associated encephalopathy Depression Mechanism

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Positive direction of polarization-induced electric field improves formic acid electrooxidation on Pd

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Nano Research 2023年第8期16卷 10848-10856页

作者： Shuozhen Hu yunyun Cheng Guoming Luo Kai Huang Cheng Shi Jie xu Cheng Lian Shigang Sun Xinsheng Zhang State Key Laboratory of Chemical Engineering East China University of Science and TechnologyShanghai 200237China Shanghai Hydrogen Propulsion Technology Co. Ltd.Shanghai 201800China Shanghai Haizhiqing Energy Development Co. Ltd.Shanghai 200333China Key Laboratory of Advanced Civil Engineering Materials of Ministry of Education Functional Materials Research LaboratorySchool of Materials Science and EngineeringTongji UniversityShanghai 201804China School of Materials Science and Engineering Anhui University of TechnologyMa’anshan 243002China State Key Laboratory of Physical Chemistry of Solid Surfaces Department of ChemistryCollege of Chemistry and Chemical EngineeringXiamen UniversityXiamen 361005China

Adjusting the adsorption energy of adsorbates on catalyst can directly regulate the catalytic performance and reaction pathways of heterogeneous catalysis.Herein,we report a novel strategy,introducing polarization-induced electric field(PIEF)with different directions,to manipulate the adsorption energy of intermediates and reaction pathway of formic acid electrooxidation on Pd.Tourmaline nanoparticles are applied as the PIEF provider,of which the direction is successfully controlled via aligning the dipoles in tourmaline in a strong external electric field.Experimental and theoretical results systematically reveal that positive PIEF leads to an electron-deficient state of Pd,reduced adsorption energy of COad,enhanced adsorption energy of*HCOOH and*OH,and promoted formate pathway of formic acid electrooxidation.Pd/TNP+/FTO,with the aid of positive PIEF,shows three-fold enhancement in the formic acid electrooxidation(4.74 mA·cm^(−2))with high durability and anti-poisoning ability compared with pristine Pd.This study leads a new route to design formic acid electrocatalysts and provides an understanding on how to control the adsorption energy of adsorbates on electrocatalysts by an internal electric field.

关键词： dipole-aligned tourmaline ferroelectric material polarization-induced electric field direction palladium adsorption energy formic acid oxidation mechanism

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Evaluation of umami taste components of mushroom (Suillus granulatus) of different grades prepared by different drying methods

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Food Science and Human Wellness 2020年第2期9卷 192-198页

作者： Xiuhong Zhao yunyun Wei xue Gong Heran xu Guang Xin Grain College Shenyang Normal UniversityShenyang 110034China College of Food Science Shenyang Agricultural UniversityShenyang 110866China

Suillus granulatus is a valuable wild edible mushroom with a strong umami taste.Different grades of S.granulatus were dried by different methods,including natural air drying(ND),hot air drying(HAD),vacuum drying(VD),and freeze drying(FD).Results showed that VD samples of all grades had the highest equivalent umami concentration(EUC)value(P<0.05).The second grade of ND samples showed the highest EUC value(P<0.05).The first grade of HAD samples showed the highest EUC value(P<0.05).The third grade of FD samples showed the highest EUC value(P<0.05).The third grade of VD samples had a higher EUC value than the other grades of samples dried by VD.Electronic tongue results indicated no significant differences between samples of all grades dried by all methods.Thus,umami taste components are affected by drying method and grade.VD is an appropriate drying method for all sample grades.ND,HAD,and FD are suitable for second-,first-,and third-grade samples,respectively.

关键词： Suillus granulatus drying methods grade umami taste components

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本土市场规模对技术创新及演化路径的影响——以工业机器人为例

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科研管理 2023年第11期44卷 22-31页

作者：徐圆杨芸芸南京财经大学国际经贸学院江苏南京210023 南京财经大学江苏产业发展研究院江苏南京210023

智能生产技术对制造强国战略实施和加快形成现代产业体系意义重大,但如何利用我国规模巨大的应用市场助推相关技术创新仍缺乏一定研究。文章以智能制造的典型技术——工业机器人为例,基于市场应用和发明专利数据,从230个城市层面验证大... 详细信息

智能生产技术对制造强国战略实施和加快形成现代产业体系意义重大,但如何利用我国规模巨大的应用市场助推相关技术创新仍缺乏一定研究。文章以智能制造的典型技术——工业机器人为例,基于市场应用和发明专利数据,从230个城市层面验证大规模的本土市场能否激发技术创新,并从关联度和复杂度揭示其对区域知识结构与演化路径的影响。研究结论如下:(1)我国超大规模的工业机器人应用市场对相关技术创新具有显著促进作用;(2)工业机器人的市场规模与技术创新呈现出地理上的协同集聚特征,且有相关知识基础的城市更能从本土市场效应中获得收益;(3)不同于先发国家的科技引领生产模式,市场驱动创新模式使得我国更倾向于在低复杂度的工业机器人技术领域形成突破;(4)相比较于工业机器人应用已经比较成熟的行业,后续渗透度逐步提升、具有潜在规模市场的行业对城市相关技术创新的边际效应更为明显。因此,政府应从需求牵引的角度,有效结合地区的技术基础,加大对特定行业工业机器人应用的政策扶持,同时发挥新型举国体制优势,重点攻关“卡脖子”技术,避免陷入由市场驱动创新的“低端陷阱”。

关键词：工业机器人本土市场效应技术创新市场渗透度

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