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Variations in surface and electrical properties of polytetrafluoroethylene film after plasma-induced grafting of acrylic acid

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Nuclear Science and Techniques 2016年第3期27卷 88-95页

作者： Rong Li Xin-zhong He Qian-Hong Gao Li-Juan Pang Hong-Long Wang Jiang-Tao Hu Zhe Xing guo-zhong wu Shanghai Institute of Applied Physics Chinese Academy of SciencesShanghai 201800China University of Chinese Academy of Sciences Beijing 100049China School of Physical Science and Technology Shanghai Tech UniversityShanghai 200031China

Polytetrafluoroethylene(PTFE) film was graftpolymerized with acrylic acid(AAc) via a low-temperature plasma *** effect of plasma treatment parameters(radio-frequency power and treatment time) on the spin number of free radicals in PTFE film was *** total reflection Fourier transform infrared(ATR-FTIR)spectroscopy,X-ray photoelectron spectroscopy,scanning electron microscopy,and atomic force microscopy were employed to characterize the chemical structure,surface composition,and microstructure of the original PTFE and PTFE-g-PAAc films,respectively,in order to verify the successful graft polymerization of AAc onto a PTFE film *** analysis illustrated that the thermal stability of bulk PTFE film remains unchanged after graft *** contact angle measurements confirmed that the hydrophilicity of PTFE-g-PAAc film was effectively improved as compared to the original PTFE *** dielectric constant(ε_r) of PTFE-g-PAAc(GD =218 μg/cm^2) film remained invariable,compared to that of the unmodified PTFE ***,the dielectric loss(tanδ) of PTFE film increased considerably,from 0.0002(GD = 0μg/cm^2) to 0.0073(GD = 218 μg/cm^2),which might be due to the increase in surface polarity and moisture resulting from AAc graft *** addition,the surface electrical resistance(R_s) of PTFE film decreased slightly,from 131.89(GD = 0 μg/cm^2) to 110.28 Ω cm^2(GD = 218μg/cm^2) after surface modification,but still retained its inherent high impedance.

关键词：聚四氟乙烯膜表面组成接枝聚合等离子体引发丙烯酸导电性能膨体聚四氟乙烯薄膜低温等离子体技术

A highly efficient pathway to recover gold from acid aqueous solution by using an amidoxime-functionalized UHMWPE fiber

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Rare Metals 2019年第11期38卷 1105-1112页

作者： Yu-Lin Liang Chan Jin Jiang-Tao Hu Zhen Liu Yan Li Jian-Rong Zeng guo-zhong wu Xiang-Jun Wei Shanghai Institute of Applied Physics Chinese Academy of SciencesShanghai 201800China University of Chinese Academy of Sciences Beijing 100049China School of Physical Science and Technology ShanghaiTech UniversityShanghai 201210China

A new amidoxime-functionalized ultrahigh molecular weight polyethylene fibrous adsorbent(UHMWPEg-PAO) was used for the recovery of Au(III) from acid aqueous *** maximum experimental absorption capacity of UHMWPE-g-PAO fiber was found to be approximately 220.0 mg·g^-*** adsorption on UHMWPE-g-PAO was characterized by synchrotron radiation-based microcomputed tomography(SR-μ-CT),transmission electron microscopy(TEM),X-ray absorption near-edge structure spectroscopy(XANES) and synchrotron radiation-based Fourier transform infrared microspectroscopy(SR-FTIR).The SR-μ-CT and TEM results showed the distribution features of gold particles on the *** mechanism of Au(III) recovery from aqueous solutions by UHMWPE-g-PAO was based on the adsorbed Au(III) ions,which were reduced to metallic zero-valent gold(Au(0)) by amino groups(-NH2) in the amidoxime(AO)groups during the adsorption process,as confirmed by highresolution TEM(HRTEM) and XANES analyses.X-ray diffraction(XRD) results indicated that the incineration ashes contained metallic zero-valent *** conclusion,this amidoxime-functionalized fibrous adsorbent is a promising material for recovering gold from aqueous solution.

关键词： UHMWPE-g-PAO Adsorption mechanism Gold Reduction

Amidoxime-based adsorbents prepared by cografting acrylic acid with acrylonitrile onto HDPE fiber for the recovery of uranium from seawater

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Nuclear Science and Techniques 2017年第4期28卷 13-18页

作者： Lu Xu Jiang-Tao Hu Hong-Juan Ma Chang-Jian Ling Mou-Hua Wang Rong-Fang Shen Xiao-Jing guo Yin-Ning Wang Jing-Ye Li guo-zhong wu Shanghai Institute of Applied Physics Chinese Academy of Sciences Nuclear and Radiation Safety Center Ministry of Environmental Protection of the People's Republic of China

An amidoxime-based polymeric adsorbent was prepared by pre-irradiation grafting of acrylonitrile and acrylic acid onto high-density polyethylene fibers using electron beams,followed by *** recovery of uranium was investigated by flow-through experiment using simulated seawater and marine test in natural *** maximum amount of uranium uptake was 2.51 mg/g-ads after 42 days of contact with simulated seawater and 0.13 mg/g-ads for 15 days of contact with natural seawater.A lower uranium uptake in marine test can be attributed to the short adsorption time and the contamination of marine microorganisms and ***,the high selectivity toward uranium against vanadium may be beneficial to harvest uranyl ion onto adsorbents and the economic feasibility for recovery of uranium from seawater.

关键词： Radiation-induced grafting Amidoxime Acrylonitrile Uranium Selectivity

Efficient and selective removal of Pb(Ⅱ) from landfill leachate using L-serine-modified polyethylene/polypropylene nonwoven fabric synthesized via radiation grafting technique

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Nuclear Science and Techniques 2024年第4期35卷 144-155页

作者： Xin-Xin Feng Cheng Li Xuan-Zhi Mao Wan-Ning Ren Yang Gao Yu-Long He Zhe Xing Rong Li guo-zhong wu Shanghai Institute of Applied Physics Chinese Academy of SciencesShanghai 201800China University of Chinese Academy of Sciences Beijing 100049China School of Physical Science and Technology ShanghaiTech UniversityShanghai 201210China

In this study,to efficiently remove Pb(Ⅱ) from aqueous environments,a novel L-serine-modified polyethylene/polypropylene nonwoven fabric sorbent(NWF-serine)was fabricated through the radiation grafting of glycidyl methacrylate and subsequent L-serine *** effect of the absorbed dose was investigated in the range of 5–50 ***-serine was characterized by Fourier transform infrared spectroscopy,thermogravimetric analysis,and scanning electron *** adsorption tests were conducted to investigate the influences of pH,adsorption time,temperature,initial concentration,and sorbent dosage on the Pb(Ⅱ) adsorption performance of *** results indicated that Pb(Ⅱ) adsorption onto NWF-serine was an endothermic process,following the pseudo-second-order kinetic model and Langmuir isotherm *** saturated adsorption capacity was 198.1 mg/***-serine exhibited Pb(Ⅱ) removal rates of 99.8% for aqueous solutions with initial concentrations of 100 mg/L and 82.1% for landfill leachate containing competitive metal ions such as Cd,Cu,Ni,Mn,and ***,NWF-serine maintained 86% of its Pb(Ⅱ) uptake after five use *** coordination of the carboxyl and amino groups with Pb(Ⅱ) was confirmed using X-ray photoelectron spectroscopy and extended X-ray absorption fine structure analysis.

关键词： Landfill leachate Radiation grafting Polyethylene/polypropylene nonwoven fabric Pb(Ⅱ)removal

Branched fibrous amidoxime adsorbent with ultrafast adsorption rate and high amidoxime utilization for uranium extraction from seawater

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Nuclear Science and Techniques 2023年第6期34卷 79-90页

作者： Wan-Ning Ren Xin-Xin Feng Yu-Long He Ming-Lei Wang Wan-Feng Hong Hong-Wei Han Jiang-Tao Hu guo-zhong wu School of Physical Science and Technology ShanghaiTech UniversityShanghai200031China Shanghai Institute of Applied Physics Chinese Academy of SciencesShanghai201800China University of Chinese Academy of Sciences Beijing100049China College of Science University of Shanghai for Science and TechnologyShanghai200093China College of Science Shanghai UniversityShanghai200444China

Direct collection of uranium from low uranium systems via adsorption remains *** sorbent materials with amidoxime(AO)groups are promising adsorbents for uranium extraction from ***,low AO adsorption group utilization remains an *** herein fabricated a branched structure containing AO groups on polypropylene/polyethylene spun-laced nonwoven(PP/PE SNW)fibers using grafting polymerization induced by radiation(RIGP)to improve AO *** chemical structures,thermal properties,and surface morphologies of the raw and treated PP/PE SNW fibers were *** results show that an adsorptive functional layer with a branching structure was successfully anchored to the fiber *** adsorption properties were investigated using batch adsorption experiments in simulated seawater with an initial uranium concentration of 500μg·L^(−1)(pH 4,25℃).The maximum adsorption capacity of the adsorbent material was 137.3 mg·g^(−1)within 24 h;moreover,the uranyl removal reached 96%within 240 *** adsorbent had an AO utilization rate of 1/3.5 and was stable over a pH range of 4–10,with good selectivity and reusability,demonstrating its potential for seawater uranium extraction.

关键词： Radiation graft technology Branching structure High amidoxime utilization Seawater uranium extraction Ultrafast adsorption

Preparation of amidoxime-based PE/PP fibers for extraction of uranium from aqueous solution

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Nuclear Science and Techniques 2019年第2期30卷 39-51页

作者： Xiao Xu Xiao-Jun Ding Jun-Xuan Ao Rong Li Zhe Xing Xi-Yan Liu Xiao-Jing guo guo-zhong wu Hong-Juan Ma Xiao-Yan Zhao School of Petrochemical Engineering Changzhou University Shanghai Institute of Applied Physics Chinese Academy of Sciences University of Chinese Academy of Sciences

A novel amidoxime-based fibrous adsorbent,denoted as PE/PP-g-(PAAc-co-PAO), was prepared by preirradiation grafting of acrylic acid and acrylonitrile onto polyethylene-coated polypropylene skin-core(PE/PP)fibers using 60 Co γ-ray irradiation, followed by amidoximation. The original and modified PE/PP fibers were characterized by a series of characterization methods to demonstrate the attachment of amidoxime groups onto the PE/PP fibers. Breaking strength tests confirmed that the fibrous adsorbent could maintain good mechanical properties. The adsorption capacity of the PE/PP-g-(PAAc-coPAO) fibers was investigated in simulated seawater with an initial uranium concentration of 330 μg/L. The uranium adsorption capacity was 2.27 mg/g-adsorbent after 24 h in simulated seawater, and the equilibrium data were well described by the Freundlich isotherm model. The PE/PP-g-(PAAc-co-PAO) adsorbent exhibited good regeneration and recyclability during five adsorption-desorption *** adsorption test was also performed in simulated radioactive effluents with uranium concentrations of 10 and100 μg/L. The effect of the pH value on the adsorption capacity was also studied. At a very low initial concentration 10 μg/L solution, the PE/PP-g-(PAAc-co-PAO)fiber could remove as much as 93.0% of the uranium, and up to 71.2% of the uranium in the simulated radioactive effluent. These results indicated that the PE/PP-g-(PAAcco-PAO) adsorbent could be used in radioactive effluents over a wide range of pH values. Therefore, the PE/PP-g-(PAAc-co-PAO) fibers, with their high uranium selectivity,good regeneration and recyclability,good mechanical properties, and low cost, are promising adsorbents for extracting uranium from aqueous solutions.

关键词： Amidoxime groups Pre-irradiation PEcoated PP skin-core fiber Adsorption Uranium

Perioperative artificial nutrition in malnourished gastrointestinal cancer patients

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World Journal of Gastroenterology 2006年第15期12卷 2441-2444页

作者： guo-Hao wu zhong-Hua Liu Zhao-Han wu Zhao-Guang wu Department of General Surgery Z-hongshan-HospitalFudan University Shanghai 200032 China

AIM： To investigate the potential role of perioperative nutrition in reducing complications and mortality in malnourished gastrointestinal cancer patients. METHODS： Four hundred and sixty-eight elective moderately or severely malnourished surgical patients with gastric or colorectal cancers defined by the subjective global assessment （SGA） were randomly assigned to 7 d preoperative and 7 d postoperative parenteral or enteral nutrition vs a simple control group. The nutrition regimen included 24.6±5.2 kcal /kg per d non-protein and 0.23±0.04 g nitrogen /kg per d. Control patients did not receive preoperative nutrition but received 600±100 kcal non-protein plus or not plus 62 ± 16 g crystalline amino acids postoperatively. RESULTS： Complications occurred in 18.3% of the patients receiving nutrition and in 33.5% of the control patients （P= 0.012）. Fourteen patients died in the control group and 5 in those receiving nutrition. There were significant differences in the mortality between the two groups （2.1% vs 6.0%, P=0.003）. The total length of hospitalization and postoperative stay of control patients were significantly longer （29 vs 22 d, P=0.014） than those of the studied patients （23 vs 12 d, P= 0.000）. CONCLUSION： Perioperative nutrition support is beneficial for moderately or severely malnourished gastrointestinal cancer patients and can reduce surgical complications and mortality.

关键词： Malnutrition Perioperative nutrition Parenteral nutrition Enteral nutrition Mortality Complications

Effect of chlorination and ultraviolet on the adsorption of pefloxacin on polystyrene and polyvinyl chloride

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Journal of Environmental Sciences 2025年第3期149卷 21-34页

作者： Yanan Li Yaning wu Kai guo Weiqin wu Meijing Yao School of Environmental Science and Engineering Taiyuan University of TechnologyShanxi 030600China

During thewater treatment process,chlorination and ultraviolet(UV)sterilization can modify microplastics(MPs)and alter their physicochemical properties,causing various changes between MPs and other *** this study,the impact of chlorination and UV modification on the physicochemical properties of polystyrene(PS)and polyvinyl chloride(PVC)were investigated,and the adsorption behavior of pefloxacin(PEF)before and after modificationwas *** effect of pH,ionic strength,dissolved organicmatter,heavymetal ions and other water environmental conditions on adsorption behavior was *** results showed that PS had a higher adsorption capacity of PEF than PVC,and the modification increased the presence of O-containing functional groups in the MPs,thereby enhancing the adsorption capacity of both *** had a more significant impact on the physicochemical properties of MPs compared to UV irradiation within the same time period,leading to better adsorption performance of *** optimal pH for adsorption was found to be 6,and NaCl,sodium alginate and Cu2+would inhibit adsorption to varying degrees,among which the inhibition caused by pH was the *** and UV modification would weaken the inhibitory effect of environmental factors on the adsorption of PEF by *** main mechanisms of adsorption involved electrostatic interaction and hydrogen *** study clarified the effects of modification on the physicochemical properties of MPs,providing reference for subsequent biotoxicity analysis and environmental protection studies.

关键词： Microplastics Chlorination Ultraviolet Pefloxacin Adsorption mechanism

Enhanced interferon-y secretion and antitumor activity of T-lymphocytes activated by dendritic cells loaded with glycoengineered myeloma antigens

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Chinese Medical Journal 2007年第19期120卷 1678-1684页

作者： XIONG Hong wu Qiu-ye HU Hong-gang LIU Ban guo zhong-wu Daniel Man-yuan Sze HOU Jian Department of Hematology Shanghai Changzheng Hospital Second Military Medical University Shanghai 200003 China School of Pharmacy Second Military Medical University Shanghai 200433 China Department of Chemistry Wayne State University 5101 Cass Avenue Detroit Michigan 48202 USA Institute of Hematology Royal Prince Alfred Hospital University of Sydney Missenden Road Camperdown Sydney NSW2050 Australia

Background Immunotherapy is emerging as a promising cure for cancer. However, a severe problem in this area is the immune tolerance to tumor cells and tumor-associated antigens, as evidenced by the ability of cancer to escape immune surveillance. To overcome this problem this work examined the potential of improving the antigenicity of myeloma by metabolic engineering of its cell surface carbohydrate antigens （i.e., glycoengineering） and presentation of the modified tumor antigens by dendritic cells （DCs） to generate cytotoxic T-lymphocytes （CTLs）. Methods CD138^＋ myeloma cells were isolated from 11 multipe myeloma （MM） patients by the immunomagnetic bead method. The MM cells were treated with N-propionyI-D-mannosamine （ManNPr）, a synthetic analog of N-acetyl-D-mannosamine （ManNAc）, the natural biosynthetic precursor of N-acetyl sialic acid （NeuNAc）, to express unnatural N-propionylated sialoglycans. The glycoengineered cells were then induced to apoptosis, and the apoptotic products were added to cultured functional DCs that could present the unnatural carbohydrate antigens to autologous T-lymphocytes. Results It was found that the resultant DCs could activate CD4^＋ and CD8^＋ T-lymphocytes, resulting in increased expression of T cell surface markers, including CD8CD28 and CD4CD29. Moreover, upon stimulation by glycoengineered MM cells, these DC-activated T-lymphocytes could release significantly higher levels of IFN-y （P〈0.05）. Lactate dehydrogenase （LDH） assays further showed that the stimulated T-lymphocytes were cytotoxic to glycoengineered MM cells. Conclusions This work demonstrated that glycoengineered myeloma cells were highly antigenic and the CTLs induced by the DCs loaded with the unnatural myeloma antigens were specifically cytotoxic to the glycoengineered myeloma. This may provide a new strategy for overcoming the problem of immune tolerance for the development of effective immunotherapies for MM.

关键词： multiple myeloma dendritic cells T-lymphocytes immunotherapy