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Removal of tetracycline from aqueous solution by a Fe_3O_4 incorporated PAN electrospun nanofiber mat

Journal of Environmental Sciences 2015年第2期27卷 29-36页

作者： Qing Liu yuming zheng Lubin Zhong Xiaoxia Cheng Key Laboratory of Urban Pollutant Conversion Institute of Urban Environment Chinese Academy of Sciences College of Resources and Environment University of Chinese Academy of Sciences College of Environmental and Municipal Engineering Xi'an University of Architecture and Technology

Pollution of antibiotics, a type of emerging contaminant, has become an issue of concern,due to their overuse in human and veterinary application, persistence in environment and great potential risk to human and animal health even at trace level. In this work, a novel adsorbent, Fe3O4 incorporated polyacrylonitrile nanofiber mat（Fe-NFM）, was successfully fabricated via electrospinning and solvothermal method, targeting to remove tetracycline（TC）, a typical class of antibiotics, from aqueous solution. Field emission scanning electron microscopy and X-ray diffraction spectroscopy were used to characterize the surface morphology and crystal structure of the Fe-NFM, and demonstrated that Fe-NFM was composed of continuous, randomly distributed uniform nanofibers with surface coating of Fe3O4 nanoparticles. A series of adsorption experiments were carried out to evaluate the removal efficiency of TC by the Fe-NFM. The pseudo-second-order kinetics model fitted better with the experimental data. The highest adsorption capacity was observed at initial solution p H 4 while relative high adsorption performance was obtained from initial solution p H 4 to 10. The adsorption of TC on Fe-NFM was a combination effect of both electrostatic interaction and complexation between TC and Fe-NFM. Freundlich isotherm model could better describe the adsorption isotherm. The maximum adsorption capacity calculated from Langmuir isotherm model was 315.31 mg/g. Compared to conventional nanoparticle adsorbents which have difficulties in downstream separation, the novel nanofiber mat can be simply installed as a modular compartment and easily separated from the aqueous medium, promising its huge potential in drinking and wastewater treatment for micro-pollutant removal.

关键词： Adsorption Antibiotics Electrospinning Composite nanomaterial

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Universal Behavior of Nuclear Fragmentation

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Chinese journal of nuclear physics 1995年第3期17卷 215-220页

作者： zheng, yuming Richert, Jean Wagner, Pierre Beijing China

We use the bond percolation model to study the multifragrnentation of197Au projectiles interact-ing with Cu target at a bombarding energy of 600 MeV/*** charge observables and some of their dif-ferential distributions are *** theoretical results agree well with the experimental data ofALADIN *** indicates that the percolation model can describe reasonably the universal be-havior of nuclear fragmentation in nucleus-nucleus collisions.

关键词： Nuclear fragmentation Universal behavior Bond percolation model Heavy ion collision

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Preparation,characterization and performance of an electrospun carbon nanofiber mat applied in hexavalent chromium removal from aqueous solution

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Journal of Environmental Sciences 2019年第3期31卷 75-84页

作者： Zhihua Yuan Xiaoxia Cheng Lubin Zhong Renxiang Wu yuming zheng CAS Key Laboratory of Urban Pollutant Conversion Institute of Urban Environment Chinese Academy of Sciences

Hexavalent chromium, Cr(VI), a highly toxic oxyanion known as a carcinogen and mutagen,is an issue of concern due to its adverse impact on human health. Therefore, development of effective technologies and/or materials for Cr(VI) removal from water has been of great interest for researchers. In this study, an electrospun carbon nanofiber(CNF) mat was prepared via electrospinning polyacrylonitrile(PAN), followed by thermal pre-oxidation and carbonization. Scanning electron microscopy(SEM) observation showed that the fiber diameter of the CNF with carbonization temperature of 950°C(CNF_(950)) was about 266 *** titration analysis demonstrated that the point of zero charge p H(pHpzc) of CNF_(950) was around 7.93. CNF_(950) demonstrated high adsorption capacity and fast adsorption kinetics for Cr(VI) at pH < 3. Langmuir isotherm calculations showed that the maximum adsorption capacity of Cr(VI) on CNF_(950) was 118.8 mg/g at pH 2. The adsorption isotherm of Cr(VI) on CNF_(950) was well described by the Redlich–Peterson model, revealing that Cr(VI)adsorption was the result of a combination of monolayer and multilayer adsorption,depending on the initial Cr(VI) concentration. Solution pH greatly affected Cr(VI) adsorption onto CNF_(950) due to the electrostatic interaction, and the adsorption capacity was relatively high when pH was below 3. X-ray photoelectron spectroscopy(XPS) analysis revealed that the removal of Cr(VI) might be the result of a combination of redox reaction and electrostatic adsorption. The adsorption-saturated CNF_(950) could be regenerated by NaOH solution. This study extends the potential applicability of electrospun CNF mats for Cr(VI)-contaminated water purification.

关键词： Adsorption Carbon nanofiber mat Electrospinning Hexavalent chromium Redox reaction

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DYNAMICAL FEATURES OF MEDIUM ENERGY HEAVY ION COLLISION PROCESSES

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Chinese Physics Letters 1989年第3期6卷 117-121页

作者： zheng yuming SA Benhao ZHANG Xiaoze Institute of Atomic Energy Beijing

A semiclassical dynamical simulation for medium and highenergy heavy ion collisions is presented and used to discuss in detail the features of evolution for ^(12)C(25GeV;b=0.0fm)+^(63)Cu *** the calculated results it is shown that the model proposed can give a reasonable picture of the compression,expansion and fragmentation processes of the system in heavy ion reaction.

关键词： reaction fragmentation expansion

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Equilibrating in Intermediate-High Energy Nuclear Reaction

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Chinese journal of nuclear physics 1997年第4期19卷 198-201页

作者： Lu, Zhongdao Sa, Benhao zheng, yuming Wang, Hui Chu, Zili China Inst of Atomic Energy Beijing China

The equilibrating problem for intermediate-high energy reaction is studied by themicroscopic kinetic *** calculations are carried out for reaction 830 MeV p+*** evolution of the squared momentum components and the kin... 详细信息

关键词： Equilibrating Intermediate-high energy reaction Microscopic kinetic model

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Rapidity,Transverse Mass Distributions and Nuclear Stopping in(14.6 AGeV/c)Si+A u Reactions

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Chinese Physics Letters 1993年第8期10卷 468-471页

作者： WANG Zhongqi SA Benhao LU Zhongda ZHANG Xiaoze SONG Guang zheng yuming CCAST(World Lab.) Beijing 100080 China Institute of Atomic Energy Beijing 102413(mailing address)

The experimental data of proton and pion rapidity distributions and proton transverse mass distribution in rcaction of(14.6AGeV/c)Si+Au are compared with a simple relativistic hadronic cascade *** theoretical results ... 详细信息

关键词： energy statement

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Improved image resolution on thoracic carcinomas by quantitative 18F-FDG coincidence SPECT/CT in comparison to 18F-FDG PET/CT

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The Journal of Biomedical Research 2020年第4期34卷 309-317页

作者： yuming zheng Chaoling Jin Huijuan Cui Haojie Dai Jue Yan Pingping Han Bailing Hsu Nuclear Medicine Department China-Japan Friendship HospitalBeijing 100029China Oncology of Integrative Medicine Department China-Japan Friendship HospitalBeijing 100029China Nuclear Medicine Department Danli HospitalBeijing 100073China Nuclear Science and Engineering Institute University of Missouri-ColumbiaColumbiaMO 65201USA.

Currently,18F-FDG coincidence SPECT(Co-SPECT)/CT scan still serves as an important tool for diagnosis,staging,and evaluation of cancer treatment in developing *** implemented full physical corrections(FPC) to Co-SPECT(quantitative Co-SPECT) to improve the image resolution and contrast along with the capability for image *** included attenuation,scatter,resolution recovery,and noise reduction.A standard NEMA phantom filled with 10:1 F-18 activity concentration ratio in spheres and background was utilized to evaluate image ***,15 patients with histologically confirmed thoracic carcinomas were included to undergo a 18 F-FDG Co-SPECT/CT scan followed by a 18 F-FDG PET/CT *** parameters as SUVmax,SUVmean,SULpeak,and MTV from both quantitative Co-SPECT and PET were *** resolution of Co-SPECT for NEMA phantom was improved to reveal the smallest sphere from a diameter of 28 mm to 22 mm(17 mm for PET).The image contrast was enhanced from 1.7 to 6.32(6.69 for PET) with slightly degraded uniformity in background(3.1% vs.6.7%)(5.6% for PET).Patients’ SUVmax,SUVmean,SULpeak,and MTV measured from quantitative Co-SPECT were overall highly correlated with those from PET(r=0.82-0.88).Adjustment of the threshold of SUVmax and SUV to determine SUVmean and MTV did not further change the correlations with PET(r=0.81-0.88).Adding full physical corrections to Co-SPECT images can significantly improve image resolution and contrast to reveal smaller tumor lesions along with the capability to quantify functional parameters like PET/CT.

关键词： 18F-FDG coincidence SPECT/CT full physical corrections thoracic carcinomas image quantitation

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Tuning SMSI to stabilize metallic Pd species:A case study on Pd/TiO_(2) for HCHO oxidation

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Chinese Chemical Letters 2024年第3期35卷 162-166页

作者： Chunying Wang Xiaofeng Liu Jingyi Wang Yaobin Li Shaohua Xie Fudong Liu Changbin Zhang yuming zheng Wenpo Shan Hong He Center for Excellence in Regional Atmospheric Environment Key Laboratory of Urban Pollutant ConversionInstitute of Urban EnvironmentChinese Academy of SciencesXiamen 361021China Zhejiang Key Laboratory of Urban Environmental Processes and Pollution Control Ningbo Urban Environment Observation and Research StationChinese Academy of SciencesNingbo 315800China Department of Civil Environmentaland Construction Engineering(CECE)Catalysis Cluster for Renewable Energy and Chemical Transformations(REACT)Nano Science Technology Center(NSTC)University of Central FloridaOrlandoFL 32816USA State Key Joint Laboratory of Environment Simulation and Pollution Control Research Center for Eco-environmental SciencesChinese Academy of SciencesBeijing 100085China

Pretreatment of the carrier for supported catalysts can effectively improve the strong metal-support interaction(SMSI)and increase the dispersion of precious metals,which are critical to many important catalytic *** this work,we tuned SMSI on Pd/TiO_(2)catalysts through inducing surface defects of TiO_(2)by pretreated with different atmospheres(H_(2)/N_(2),N_(2),O_(2)/N_(2))at the high temperature(800℃).Multiple characterization results illustrated that surface defects anchored Pd species and thus enhanced their *** reduction,Ti^(3+)species formed and transferred onto the metallic Pd species and then induced SMSI,which effectively stabilize Pd species in the metallic *** stronger MSI,the more stability of Pd *** a case,Pd/TiO_(2)–800H_(2),with strongest MSI,displayed the best HCHO oxidation performance at low temperature(10℃).

关键词： Pd/TiO_(2) Surface defects SMSI Formaldehyde Stability of Pd species

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Analysis of Serum Levels of IgA Antibodies to Epstein Barr Virus Capsid Antigens in the Spouses and the Children of Patients with Nasopharyngeal Carcinoma

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Clinical oncology and cancer researeh 2009年第4期6卷 267-270页

作者： Jiru Cheng Yonglin Cai yuming zheng Jun Li Yongkun Mo Wuzhou Red Cross Hospital Wuzhou CancerResearch Institute Wuzhou 543002 GuangxiZhuang Autonomous Region China.

OBJECTIVE To analyze the serum levels of IgA antibodies to Epstein Barr virus capsid antigens （EBV/IgA/VCA） in patients with nasopharyngeal carcinoma （NPC） and in their spouses and children in order to further evaluate the risk of developing the disease in family members of NPC patients. METHODS Four categories of sera were used to detect EBV/ IgA/VCA using the immunoenzyme method. In our study 317 biopsy-confirmed NPC patients, 317 spouses and 317 children of the NPC patients, as well as 413 healthy subjects as the controls that came from the same area were enrolled. RESULTS The positive rate of EBV/lgA/VCA was 97.2%, 14.2%, 19.9% and 3.1% in the NPC patients, the spouse and child groups, and in the control group, respectively. The positive rate was significantly higher in the NPC group than in the other 3 groups, and it was also significantly higher in the spouse and in the child groups than in the control group （P 〈 0.001）. The results of the relative to identified distribution unit （Ridit） analysis showed that the average Ridit values were 0.860, 0.404, 0.424 and 0.356 respectively in the NPC patients, in the spouse and child groups, and in the control group. The antibody titer of IgA/VCA was significantly higher in the NPC group than in the other 3 groups, and it was also significantly higher in both the spouse and child groups than in the control group （P 〈 0.001）. The OR values of positive EBV/IgA/VCA antibody were 5.09 and 7.63, respectively in the spouse and child groups. No significant differences were found in the positive rates or in the titers of IgA/VCA antibody between the groups of spouses and children （P 〉 0.05）. CONCLUSION Positive detection of EBV/IgA/VCA antibody occurs in familial aggregation, as there is ample opportunity for EBV reactivation in the spouses and in the children of NPC patients. These individuals with a high risk of developing the NPC should be closely followed in order to detect the disease at an early stage.

关键词： nasopharyngeal carcinoma Epstein-Barr virus antibody family member.

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FCC催化剂生产过程水的优化应用

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石油学报（石油加工） 2012年第S1期28卷 160-163页

作者：郑育明中国石化催化剂齐鲁分公司山东淄博255336

通过对FCC催化剂生产过程中各单元的用水情况进行分析,根据实际的工艺要求,设计和改造用水网络,不仅将用水关系紧密的工序局部优化,而且从生产全过程出发,统筹考虑不同工序对水质水量的要求,通过对水质水量的综合匹配,不断进行优化,达... 详细信息

通过对FCC催化剂生产过程中各单元的用水情况进行分析,根据实际的工艺要求,设计和改造用水网络,不仅将用水关系紧密的工序局部优化,而且从生产全过程出发,统筹考虑不同工序对水质水量的要求,通过对水质水量的综合匹配,不断进行优化,达到有效节约新鲜水用量、降低产品单位水耗的明显效果。

关键词： FCC催化剂生产用水网络优化

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