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Synergistic action of non-solvent induced phase separation in preparation of poly(vinyl butyral) hollow fiber membrane via thermally induced phase separation

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Journal of Central South University 2014年第6期21卷 2184-2190页

作者：邱运仁漆静韦玉清 School of Chemistry and Chemical Engineering Central South University

A systematic study of air gap distance effects on the structure and properties of poly(vinyl butyral)hollow fiber membrane via thermally induced phase separation(TIPS)has been carried *** results show that the hollow fiber membrane prepared at air gap zero has no skin layer; the pore size near the outer surface is larger than that near the inner surface; and the special pore channel-like structure near the outer surface is formed,which is quite different with the typical sponge-like structure caused by TIPS and the finger-like structure caused by non-solvent induced phase separation(NIPS),because of the synergistic action of non-solvent induced phase separation at air gap *** pore size gradually decreases from outer surface layer to the intermediate layer,but increases gradually from intermediate layer to the inner surface *** the increase of air gap distance,the pore size near the outer surface gets smaller and a dense skin layer is formed,and the pore size gradually increases from the outer surface layer to the inner surface *** permeability of the hollow fiber membrane decreases with air gap distance,the water permeability decreases sharply from 45.50×10-7 to 4.52×10-7 m3/(m2·s·kPa)as air gap increases from 0 to 10 mm at take-up speed of 0.236 m/s,further decreases from 4.52×10-7 to 1.00×10-8 m3/(m2·s·kPa)as the air gap increases from 10 to 40 *** the breaking strength and the elongation increase with the increase of air gap *** breaking strength increases from 2.25 MPa to 4.19 MPa and the elongation increases from 33.9% to 132.6% as air gap increases from 0 mm to 40 mm at take-up speed 0.236 m/s.

关键词： thermally induced phase separation hollow fiber membranes synergistic action hydrophilic membrane

Pretreatment of poly(acrylic acid) sodium by continuous diafiltration and time revolution of filtration potential

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Journal of Central South University 2019年第3期26卷 577-586页

作者： XU Jing-yuan TANG Shu-yun QIU yun-ren School of Chemistry and Chemical Engineering Central South University

The pretreatment for the removal of small molecules from poly(acrylic acid) sodium (PAAS) solution by continuous diafiltration was investigated using ultrafiltration membrane. The effects of PAAS concentration, pH, trans-membrane pressure and pretreatment time on the permeate concentration and permeate flux were studied. The results show that the necessary pretreatment time (NPT) increases with PAAS concentration, decreases with TMP. The change trend of permeate flux with time is affected by pH. The permeate fluxes rapidly decrease from the start, and then increase gradually to stable values at pH 5.0, pH 7.0 and pH 9.3. However, it decreases gradually with time till a state value at pH 3.0 (iso-electric point, IEP). The removal of small molecules is easy at pH greater than iso-electric point (IEP). The change of filtration potential with time indicates the similar trend to that of permeation concentration, but the former is more convenient for indication of NPT.

关键词： pretreatment diafiltration ultrafiltration poly(acrylic acid) sodium filtration potential

Preparation of Sialon Powder from Coal Gasification Slag

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Journal of Wuhan University of Technology(Materials Science) 2010年第6期25卷 1044-1046页

作者：汤云 State Key Lab of Western Architecture & Technology(Cultivating Base) Xi'an University of Architecture & Technology

X-ray fluorescence spectrometry（XRF）,X-ray powder diffractometry（XRD） and scanning electron microscopy（SEM） were used to characterize the chemical composition,phase constituent and microstructure of the coal gasification *** powders were synthesized by carbothermal reduction and nitridation using the coal gasification slag as raw *** experimental results showed that glass and amorphous carbon were the main phases,quartz and calcite as minor crystalline phases were also presented in porous coal gasification *** constituents of coal gasification slag were SiO2,Al2O3,CaO and residual *** powder with Ca-α-Sialon as main crystalline phase can be synthesized when coal gasification slag powders were reduced and nitrided at 1500 ℃ for 9 h using nitrogen flow of 500 ml/*** coal gasification slag is a valuable and economic starting material for preparing Sialon powders.

关键词： coal gasification slag characterization microstructure Sialon carbothermal reduction and nitridation

Efficacy and Safety of Lenalidomide in the Treatment of Multiple Myeloma： A Systematic Review and Meta-analysis of Randomized Controlled Trials

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Chinese Medical Journal 2015年第9期128卷 1215-1222页

作者： Shu-Kai Qiao Xiao-Nan Guo Jin-Hai ren Han-yun ren Department of Hematology The Second Hospital of Hebei Medical University Shijiazhuang Hebei 050000 China Department of Hematology Peking University First Hospital Beijing 100034 China

Background：Lenalidomide has emerged as an important treatment for patients with multiple myeloma （MM）.However,its role in the management of MM is still controversial and requires further *** aim of this study was to evaluate efficacy and safety of lenalidomide for MM using a ***：We searched the electronic databases including：PubMed,EMBASE and the Cochrane Center Register of Controlled *** randomized clinical trials were identified,which included a total of 2357 patients with MM who received lenalidomide-containing,noncontaining lenalidomide regimens or placebo as induction therapy or maintenance *** outcomes included overall response （OR） rate,complete response （CR） rate,3-year progression-free survival （PFS） rate,3-year overall survival （OS） rate,and different types of treatment-related adverse *** calculated the risk ratios （RRs） as well as their 95％ confidence intervals of these outcomes and pooled the results using RevMan 5.2 ***：For patients with previously untreated MM,OR rate and CR rate was significantly higher in lenalidomide-containing group than the control *** relapsed or refractory MM patients,lenalidomide-containing regimens significantly improved the OR rate,CR rate,3-year PFS rate and 3-year OS *** regard to MM patients after autologous stem cell transplantation,lenalidomide maintenance therapy significantly improved 3-year PFS rate but did not result in improved 3-year OS *** terms oftoxicities,lenalidomide therapy has a higher rate of Grade 3-4 grade cytopenias,infection,deep-vein thrombosis,and ***,the incidence of second primary malignancies was significantly higher in the lenalidomide ***：The lenalidomide-containing regimens as induction therapy clearly increased response rates and improved intervals of survival with acceptable toxicity rates for patients with ***,when physicians choose to use the lenalidomide as maintenance

关键词： Lenalidomide Meta-analysis Multiple Myeloma

Ionic liquid-wrapped MXene film with bowl-like structures for highly integrated micro-supercapacitor array with ultrahigh output voltage

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Nano Research 2023年第4期16卷 4926-4932页

作者： Cai-yun ren Sheng-You Qiu Jing-Ru Zhai Ke-Qi Zhang Jia-Xing Lu Jian Gao Chuang Wang Yong-Chao Zhang Xiao-Dong Zhu State Key Laboratory Base of Eco-Chemical Engineering Institute of Chemical TechnologyQingdao University of Science&TechnologyQingdao 266042China School of Chemistry and Chemical Engineering Harbin Institute of TechnologyHarbin 150080China School of Materials Sun Yat-sen UniversityShenzhen 518107China

Recent researches in the development of in-plane micro-supercapacitor(MSC)have been dedicated to advancing its energy density in a finite storage ***,the low ion-accessible surface area of plane electrode material has been the bottleneck limiting the energy output of ***,we design a stable ionic liquid(IL)-MXene microemulsion system in virtue of tween-20(TW20),gathering IL-TW20 microdroplets around MXene *** microemulsion can adhere on the current collector and form the dense MXene-TW20-IL *** IL as spacer and electrolyte is retained in the interlamination of MXene with the elimination of the TW20 during heat treatment,which enlarges the ion-accessible surface area of the MXene ***,the MSC based on the flexible MXene-IL film exhibits a high areal capacitance(44.6 mF·cm^(−2)),a high areal and volumetric energy density(50.7μW·h·cm^(−2)and 39 mW·h·cm^(−3)),surpassing most of the reported MXene-based *** the MSC unit can be arbitrarily integrated in terms of various energy and voltage *** instance,the integrated array with thirty MSC units in series realizes a high voltage output of 90 V,widening the range of application in next-generation microelectronic devices.

关键词： microemulsion system ionic liquid-wrapped MXene films micro-supercapacitors extra-high voltage integration

Metamorphic P-T conditions and ages of garnet-biotite schists in the Dahongshan Group from the southwestern Yangtze Block

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Acta Geochimica 2024年第4期43卷 707-718页

作者： Jun-xiao Ma Guang-shu Yang Yong-feng Yan Xiao-Fei Xu yun-hua ren Hui Zhao Xiao-jun Zheng Yuan Qin Faculty of Land Resources Engineering Kunming University of Science and TechnologyKunming 650093China Geological Team 306 of yunnan Non-Ferrous Metals Geological Bureau Kunming 650217China yunnan Provincial Bureau of Non-Ferrous Geology Kunming 650051China

The Dahongshan Group,situated at the southwestern margin of the Yangtze Block,represents a geological unit characterized by relatively high-grade metamorphism in the *** paper investigates the garnet-biotite schist from the Laochanghe Formation of the Dahongshan Group,employing an integrated approach that includes petrological analysis,phase equilibrium modeling,and zircon U-Pb *** schist is mainly composed of garnet,biotite,plagioclase,quartz,rutile,and *** equilibrium modeling revealed the peak metamorphic conditions of 8-9 kbar and 635-675°*** further integrating the prograde metamorphic profile of garnet and geothermobarometric results,a clockwise P-T metamorphic evolution path is constructed,which includes an increase in temperature and pressure during the prograde ***-ICP-MS zircon U-Pb dating and zircon Ti thermometry constrains the post-peak metamorphic age of 831.2±7.2 *** with previously reported results,it is revealed that the southwestern margin of the Yangtze Block experienced a large-scale regional metamorphism during the Neoproterozoic(890-750 Ma),which is related to the collisional orogenic *** may be associated with the late-stage assembly of the Rodinia supercontinent or with local compression and subduction processes during the breakup of the Rodinia supercontinent.

关键词： Southwestern Yangtze Block Dahongshan Group Phase equilibrium modeling Zircon U-Pb dating Neoproterozoic metamorphism

Preparation of high purity ruthenium nitrosyl nitrate from spent Ru-Zn/ZrO_(2)catalyst

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Journal of Central South University 2024年第9期31卷 3014-3023页

作者： LIU Kai-ming QIU yun-ren LI Yan College of Chemistry and Chemical Engineering Central South UniversityChangsha 410083China Kunming Boren Precious Metals Company Limited Kunming 650499China

Preparation of high purity ruthenium nitrosyl nitrate using spent Ru-Zn/ZrO_(2)catalyst was studied,including melting and leaching to obtain potassium ruthenate solution,reduction,dissolving,concentrating and drying to obtain ruthenium trichloride,nitrosation and hydrolysis to obtain ruthenium nitrosyl hydroxide,removing of K^(+)and Cl^(-),and neutralization with nitric *** effects of temperature,concentration,time and pH on the yield and purity of intermediates and final product were studied,and the optimum process conditions were *** yield of ruthenium nitrosyl nitrate is 92%,the content of ruthenium in high purity product is 32.16%,and the content of Cl^(-)and K^(+)are much less than 0.005%.The reaction kinetics of ruthenium nitrosyl chloride to ruthenium nitrosyl hydroxide was *** reaction orders of Ru(NO)Cl_(3)at 40,55 and 70℃are 0.39,0.37 and 0.39,respectively,while those of KOH are 0.16,0.15 and 0.17,*** activation energy is-2.33 k J/mol.

关键词： ruthenium nitrosyl nitrate spent catalyst high purity utilization of wastes reaction kinetics

β-receptor blocker influences return of spontaneous circulation and chemical examination in rats during cardiopulmonary resuscitation

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Journal of Zhejiang University-Science B(Biomedicine & Biotechnology) 2013年第6期14卷 505-510页

作者： Xiao-jing ZHAO Zhuo PEN Ping LI Er-xiu CHEN Jian LIU Yan-xia GAO yun-xia ren Li-jun LI Department of Emergency Medicine the Second Affiliated Hospital of Medical CollegeXi'an Jiaotong University Mechanical Energy and Experimental Center of Medical CollegeXi'an Jiaotong University

Objective:We investigated the influence of β-receptor blocker metoprolol on return of spontaneous circulation(ROSC) during cardiopulmonary resuscitation(CPR) in rats with induced myocardial infarction(MI).Methods:Male Sprague-Dawley rats were randomly divided into three groups:the sham-operated group,the MI group without metoprolol,which was fed the vehicle,and the MI+metoprolol group receiving intragastric *** group was further divided randomly into three subgroups,depending on the dosage of epinephrine administered during subsequent CPR applied after the induction of asphyxial cardiac ***:The ROSC rate was significantly decreased in the low dose subgroup of MI group,unchanged in the medium dose subgroup of MI group,and significantly decreased in the high dose subgroup of MI group,compared with the same dose subgroup of sham-operated ***+metoprolol group had a lower ROSC rate than MI group in the medium dose subgroup,and a higher ROSC rate than MI group in the high dose *** was no difference in blood K+ values of successful rats between MI group and MI+metoprolol *** rats with successful CPR had lower blood K+ values than rats with unsuccessful CPR in each of the three treatment ***:Metoprolol administered to MI rats over a long period significantly improved ROSC rates under an appropriate dose of epinephrine during *** increasing high blood K+ value would attenuate the rate of a successful CPR.

关键词： β-receptor blocker Cardiopulmonary resuscitation Return of spontaneous circulation Epinephrine Chemical examination

Recovery of Hg(Ⅱ)from aqueous solution by complexation-ultrafiltration using rotating disk membrane and shear stability of PMA-Hg complex

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Journal of Central South University 2020年第9期27卷 2507-2514页

作者： ZHOU Han QIU yun-ren CHEN Yu-xin School of Chemistry and Chemical Engineering Central South UniversityChangsha 410083China

Copolymer of acrylic acid and maleic acid(PMA)was used to remove Hg^2+from aqueous solution by complexation-ultrafiltration(C-UF)through rotating disk membrane(RDM).The effects of P/M(mass ratio of PMA to metal ions),pH and rotation speed(N)on the interception of Hg^2+were *** interception could reach 99.7%at pH 7.0,P/M 6 and N less than 1890 r/*** shear stability of PMA-Hg complex was studied by *** critical rotation speed,at which the interception starts to decrease,was 1890 r/min,and the critical shear rate,the smallest shear rate at which PMA-Hg complex begins to dissociate,was 2.50×10^5s^-1 at pH ***,the critical radii were obtained at different rotation speeds and *** results showed that the critical radius decreased with the rotation speed and increased with *** induced dissociation coupling with ultra?ltration(SID-UF)was efficiently used to recover Hg^2+and PMA.

关键词： complexation-ultrafiltration shear induced dissociation rotating disk membrane shear stability wastewater treatment