检索结果-南通市图书馆

帕立骨化醇下调心肌肾素血管紧张素和成纤维细胞生长因子的表达,改善尿毒症大鼠的心肌肥厚

在线全文

同方期刊数据库

学校读者我要写书评

暂无评论

中华高血压杂志 2014年第9期22卷 898-898页

作者： freundlich m Li YC Quiroz Y Bravo Y Seeherunvong W Faul C Weisinger JR Rodriguez-Iturbe B 罗冬梅

维生素D可能通过抑制心肌肾素血管紧张素系统（renin—angiotensinsystem，RAS）和成纤维细胞生长因子（fibroblast growth factors, FGFs）改善尿毒症所致的心肌肥厚。在实验性大鼠尿毒症模型中，研究者比较利用维生素D类似物帕立骨... 详细信息

维生素D可能通过抑制心肌肾素血管紧张素系统（renin—angiotensinsystem，RAS）和成纤维细胞生长因子（fibroblast growth factors, FGFs）改善尿毒症所致的心肌肥厚。在实验性大鼠尿毒症模型中，研究者比较利用维生素D类似物帕立骨化醇和血管紧张素转换酶抑制剂依那普利抑制RAS和FGF受体基因表达和心肌肥厚改善之间的关系。

关键词：成纤维细胞生长因子肾素血管紧张素系统心肌肥厚实验性大鼠尿毒症骨化醇血管紧张素转换酶抑制剂维生素D类似物

Chemically activated carbon nanofibers for adsorptive removal of bisphenol-A:Batch adsorption and breakthrough curve study

在线全文

学校读者我要写书评

暂无评论

Chinese Journal of Chemical Engineering 2023年第9期61卷 248-259页

作者： Wenming Hao Basma I.Waisi Timothy m.Vadas Jeffrey R.mcCutcheon College of Chemical Engineering and Technology Taiyuan University of TechnologyTaiyuan 030024China Department of Chemical&Biomolecular Engineering University of ConnecticutStorrsCT 06269United States Department of Chemical Engineering University of BaghdadBaghdad 10071Iraq Department of Civil and Environmental Engineering University of ConnecticutStorrsCT 06269United States

Activated carbon nanofibers(ACNFs)with small diameter can significantly increase the accessibility of intra pores and accelerate adsorption of molecules from *** this study,ACNFs were made by blending K_(2)CO_(3)or ZnCl_(2)as the activating agent into the polyacrylonitrile(PAN)in dimethylformamide solution for electrospinning prior to ***-A(BPA),an endocrine disruption pollutant,is widely applied in the production of polycarbonate plastics and epoxy ***,BPA is often used as a model contaminant commonly removed via *** adsorption studies were used to evaluate the kinetics and adsorption capacity of the ***-Peterson(R-P)and Langmuir models were found to fit the isotherm of BPA adsorption better than freundlich model,showing the homogeneous nature of the PAN originated *** adsorption kinetics was better described by the pseudo second-order model than that by the pseudo first-order *** fitting by intraparticle diffusion model indicates the adsorption of BPA onto ACNFs is mainly controlled by pore *** pH value and ionic strength reduced BPA adsorption from aqueous *** breakthrough curves studied in two different fixed bed systems(cross flow bed system and packed flow bed system)confirmed the scalability of BPA removal by ACNFs in dynamic adsorption *** modified dose-response model predicted well the fixed-bed outlet concentration profiles.

关键词： Activated carbon nanofibers(ACNFs) Chemical activation Bisphenol-A(BPA) Fixed bed Adsorption

An efficient nano-adsorbent via surfactants/dual surfactants assisted ultrasonic co-precipitation method for sono-removal of monoazo and diazo anionic dyes

在线全文

学校读者我要写书评

暂无评论

Chinese Journal of Chemical Engineering 2021年第12期34卷 225-236页

作者： marwa m.Ibrahim Department of Chemistry Faculty of EducationAin Shams UniversityRoxy 11711CairoEgypt

To preserve the environment for civilization,we should remove the pollutants like toxic dyes by friendly and cost efficacious *** this study,the effect of surfactants or mixed surfactants on physicochemical,optical and adsorption properties of ternary mixed oxide CeO_(2)-ZrO_(2)-Al_(2) O_3(CZA) are *** ternary mixed oxide CZA was prepared by surfactants or mixed surfactants assisted ultrasonic coprecipitation *** physicochemical and optical properties are estimated by different techniques like XRD,TEm,EDX,FTIR,S_(BET) and UV-Vis/*** CZA_T and CZA_C have hybrid shapes and high surface *** adsorption properties of ternary mixed oxides adsorbents were characterized by sono-removing anionic dyes such as Congo red(CR) and Remazol red RB-133(RR).The different factors like contact time,different dye concentrations and temperatures also *** kinetics and isotherms applications showed that,the adsorption process was followed pseudo second order kinetics and the freundlich isotherm ***,the adsorption is spontaneous and endothermic process through the thermodynamic ***,the results showed that the ternary mixed oxide nano-adsorbent(CeO_(2)-ZrO_(2)-Al_(2) O_3) is promising and functional materials for anionic dye sweep from wastewater.

关键词： CeO_(2)-ZrO_(2)-Al_(2)O_3 Surfactants Ultrasonic co-precipitation method Optical properties Wastewater Adsorption

Biosorption of copper ions from dilute aqueous solutions on base treated rubber (Hevea brasiliensis) leaves powder: kinetics, isotherm, and biosorption mechanisms

在线全文

学校读者我要写书评

暂无评论

Journal of Environmental Sciences 2008年第10期20卷 1168-1176页

作者： W.S.Wan Ngah m.A.K.m.Hanafiah School of Chemical Sciences Universiti Sains malaysia Penang 11800 malaysia.

The effciency of sodium hydroxide treated rubber (Hevea brasiliensis) leaves powder (NHBL) for removing copper ions from aqueous solutions has been investigated. The e?ects of physicochemical parameters on biosorption capacities such as stirring speed, pH, biosorbent dose, initial concentrations of copper, and ionic strength were studied. The biosorption capacities of NHBL increased with increase in pH, stirring speed and copper concentration but decreased with increase in biosorbent dose and ionic strength. The isotherm study indicated that NHBL fitted well with Langmuir model compared to freundlich and Dubinin-Radushkevich models. The maximum biosorption capacity determined from Langmuir isotherm was 14.97 mg/g at 27°C. The kinetic study revealed that pseudo- second order model fitted well the kinetic data, while Boyd kinetic model indicated that film diffusion was the main rate determining step in biosorption process. Based on surface area analysis, NHBL has low surface area and categorized as macroporous. Fourier transform infrared (FT-IR) analyses revealed that hydroxyl, carboxyl, and amino are the main functional groups involved in the binding of copper ions. Complexation was one of the main mechanisms for the removal of copper ions as indicated by FT-IR spectra. Ion exchange was another possible mechanism since the ratio of adsorbed cations (Cu2+ and H+) to the released cations (Na+, Ca2+, and mg2+) from NHBL was almost unity. Copper ions bound on NHBL were able to be desorbed at > 99% using 0.05 mol/L HCl, 0.01 mol/L HNO3, and 0.01 mol/L EDTA solutions.

关键词： copper treated rubber leaves powder kinetics isotherm ion exchange desorption

Experimental and mathematical modeling of Cr(Ⅵ) removal using nano-magnetic Fe3O4-coated perlite from the liquid phase

在线全文

学校读者我要写书评

暂无评论

Chinese Journal of Chemical Engineering 2020年第6期28卷 1582-1590页

作者： Ismail m.Ahmed mostafa m.Hamed Sayed S.metwally Chemistry Department College of ScienceJouf UniversitySkakaSaudi Arabia Hot Laboratories and Waste management Center Atomic Energy Authority13759 CairoEgypt

modification of perlite using nano-magnetic iron oxide was implemented to produce nano-magneticFe3O4-coated perlite composite(Fe3O4/Perlite).The prepared composite was characterized using Scanning Electron microscopy,Fourier-Transform Infrared spectroscopy and Powder X-ray *** potentiality of both perlite and Fe3O4/Perlite composite to eliminate Cr(VI)from the environmentally relevant water was *** influence of main factors which could affect the adsorption was studied including;pH of medium,shaking time and Cr(VI)ions *** experimental outcome demonstrated that the modification of perlite by nano-magnetic Fe3O4 showed a significantly enhanced Cr(VI)removal efficiency relative to that of unmodified *** the kinetic studies,the experimental data fitted well with the pseudo-second-order ***,it proposes that Langmuir isotherm is more adequate than the freundlich isotherm for both perlite and modified *** results recommended that Fe3O4/Perlite composite had a great potential as an economic and efficient adsorbent of Cr(VI)from contaminated water,which has huge application potential.

关键词： Nano-magnetic Composite Kinetics Isotherm Perlite Adsorption

Preparation of solar-enhanced AlZnO@carbon nano-substrates for remediation of textile wastewaters

在线全文

学校读者我要写书评

暂无评论

Journal of Environmental Sciences 2020年第6期32卷 52-68页

作者： Esraa m.El-Fawal Sherif A.Younis Yasser m.moustafa Philippe Serp Central Laboratories Analysis and Evaluation DepartmentEgyptian Petroleum Research InstituteNasr CityCairo 11727Egypt Laboratoire de Chimie de Coordination(LCC) Unite Propre de Recherche(UPR)Du Centre National de La Recherche Scientifique(CNRS)8241Composante de L’Ecole Nationale D’Ingenieurs en Arts Chimiques et Technologiques(ENSIACET)Universite de ToulouseUniversite Paul Sabatier(UPS)Institut National Polytechnique(INP)-LCC4 Allee Emile Monso31030Toulouse Cedex 4France

Photoactive aluminum doped ZnO(AlZnO)was synthesized by sol-gel *** that,AlZnO photocatalyst was deposited on five carbon-based materials(CBms)using ultrasonic route followed by solid-state mixing using ball *** CBms used were poly aniline(PANI),carbon nitride(CN),carbon nanotubes(CNT),graphene(G),and carbon nanofibers(CNF).The crystal phases,elemental compositions,morphological,and optical properties of the AlZnO@CBms composites were *** results revealed that two of AlZnO@CBms composites exhibited superior bleaching efficiency(100%removal)and photocatalytic stability(three cycles)for 50μmol/L methylene Blue(mB)contaminated water after 60 min irradiation in visible light at pH 6.5,0.7%H2O2,and 5 g/L inorganic *** optimum conditions,AlZnO@CBms nanocomposites were employed for the treatment of mixed dyestuffs composed of mB,methyl Orange(mO),Astrazone Blue FRR(BB 69),and Rhodamine B(RhB)dyes under dark,ultraviolet,visible,and direct *** mixed dyestuffs,the AlZnO@G achieved the highest dye sorption capacity(60.91μmol dye stuffs/g)with kinetic rate 8.22×10^-3 min^-1 in 90 min via multi-layer physisorption(freundlich isotherm)on graphene *** additions,AlZnO@CN offered the highest photo-kinetic rate(Kphoto)of^54.1×10^-3 min^-1(93.8%after 60 min)under direct ***,the selective radical trapping experiment confirmed that the holes and oxidative superoxide radicals are crucial on dyes photodegradation *** to their superior performance,AlZnO@G and AlZnO@CN nanocomposites can offer an effective in-situ solar-assisted adsorption/photocatalytic remediation of textile wastewater effluents.

关键词： Carbon nanomaterials AlZnO photocatalyst Hybrid adsorption/photo-catalysis Kinetic and isotherm modeling Textile wastewater remediation

Biogenic amino acid methionine-based corrosion inhibitors of mild steel in acidic media

在线全文

学校读者我要写书评

暂无评论

International Journal of minerals,metallurgy and materials 2019年第4期26卷 467-482页

作者： L.K.m.O.Goni m.A.Jafar mazumder S.A.Ali m.K.Nazal H.A.Al-muallem Chemistry Department King Fahd University of Petroleum and Minerals

N,N-Diallyl methionine ethyl ester hydrochloride 5 underwent alternating copolymerization with SO_2 via the Butler cyclopolymerization protocol in dimethyl sulfoxide(DmSO) to give water-soluble cycloterpolymer 6 with a ～1:1 molar ratio of sulfide and sulfoxide groups as a result of oxygen transfer from DmSO. Half of the sulfide groups in 6, upon oxidation with H_2O_2, afforded polymer sulfoxide 7 and polymer sulfone 8. The solution properties of these polymers were determined via a viscometric technique. The thermal stability of these polymers was determined by thermogravimetric analysis. The inhibition efficiency obtained from gravimetric mass loss, potentiodynamic polarization, and electrochemical impedance spectroscopy techniques agreed well with each other. The corrosion efficiencies increase with increasing concentration of the polymers. At a polymer concentration of 175 mm, the maximum inhibition efficiency of copolymer compounds 6–8 was determined to be 92%, 97%, and 95%, respectively. The synthesized polymer compounds acted as mixed-type inhibitors. Polymer compound 7 adsorbed onto the metal surface via chemisorption and physisorption and obeyed Langmuir, Temkin, and freundlich adsorption isotherms. Analyses by X-ray photoelectron spectroscopy and scanning electron microscopy–energy-dispersive X-ray spectroscopy indicated that the adsorbed polymers formed a thin film on the metal surface and prevented further corrosive attack.

关键词： cyclopolymerization methionine methionine sulfoxide methionine sulfone diallylamine salt corrosion inhibition

Isothermal, kinetic, and thermodynamic studies for solid-phase extraction of uranium(VI) via hydrazine-impregnated carbonbased material as efficient adsorbent

在线全文

学校读者我要写书评

暂无评论

Nuclear Science and Techniques 2019年第11期30卷 41-51页

作者： A.morsy m.H.Taha muhammad Saeed Amir Waseem muhammad Asad Riaz m.m.Elmaadawy Nuclear materials Authority El MaddiP.O.Box 530CairoEgypt Department of Chemistry Quaid-i-Azam UniversityIslamabad 45320Pakistan

The current study describes the application of a new extraction method for efficient uranium adsorption via cost-effective hydrazine-impregnated activated *** experimental parameters such as time, adsorbent weight, temperature(°C), and uranium concentration were thoroughly investigated. The synthesized adsorbent was characterized via X-ray diffraction, Fourier transformation infrared spectroscopy(FT-IR), scanning electron microscopy, and thermogravimetric analysis. The results showed86% uranium extraction under optimized conditions(20% P2O5 at 25 °C, 120 min). The obtained findings fit well with thermodynamic and isothermal(Langmuir and freundlich isotherms) models and pseudo second-order kinetics. In thermodynamic studies, the negative sign of(DG°) specified the spontaneity of process, the negative sign of(DH°) revealed endothermicity, and the positive sign of(DS°) showed high randomness after adsorption.

关键词： Uranium Adsorption Phosphoric acid Hydrazine Carbon

Cadmium sorption by sodium and thiourea-modified zeolite-rich tuffs

在线全文

学校读者我要写书评

暂无评论

Journal of Environmental Sciences 2017年第2期29卷 39-48页

作者： Perfecto Barragán P m.Guadalupe macedo m maria T.Olguín Instituto Tecnologico de Toluca Laboratorio de Investigacion en Ingenieria Ambiental.Av.Tecnologico S/NColonia Ex-Rancho La VirgenMetepecEstado de Meico CP.52140Mexico Instituto National de Investigaciones Nucleares Departamento de QuimicaA.P.18-1027Col.EseandonDelegacion Miguel Hidalgo C.P.11801Mexico

In the present investigation, two zeolite-rich tuffs from Guaymas and El Cajon（State of Sonora）, which were conditioned with a sodium chloride solution and subsequently modified with a thiourea solution, were chosen to evaluate the removal of Cd from aqueous systems. The zeolitic materials were characterized by scanning electron microscopy and X-ray diffraction. The surface area was also determined. The experiments were performed in a batch system, and the influences of p H, contact time between phases, and the concentration of Cd in the solution on the adsorption by sodium or thiourea-modified zeolite-rich tuff were investigated. It was found that the efficiency of Cd ion removal from aqueous solutions is influenced by the p H of the aqueous systems. The Cd adsorption kinetic data were well fitted to a pseudo-second-order model in all cases. The Langmuir and Langmuir–freundlich isotherms adequately described the Cd sorption behavior by the zeolite from El Cajon pretreated with Na Cl and the zeolite from Guaymas modified with thiourea, respectively.

关键词： Cadmium Zeolite-rich-tuff Sorption Kinetics Isotherms