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article

Biosorption of Pb(II) by the resistant Enterobacter sp.: Investigated by kinetics, equilibriumand thermodynamics

Liu, Lei, Xia, Mengya, Hao, Jianwen, Xu, Haoxi, more

Archives of Environmental Protection > 2021

article

Characterization and Diffusion Kinetics of the Plasma Paste Borided AISI 440C Steel

M. Keddam, R. Chegroune, M. Kulka, D. Panfil, more

Transactions of the Indian Institute of Metals > 2017 > 70 > 5 > 1377-1385

In this study, the AISI 440C steel was plasma paste borided in a gas mixture of 70 %H₂–30 %Ar using borax paste as a boron source. This thermochemical treatment was carried out at three temperatures of 700, 750 and 800 °C for 3, 5 and 7 h. The morphology of the formed boride layers was studied by scanning electron microscope. An identification of iron borides was performed using an X-ray microanalyzer,...

article

Determination of adsorptive properties of expanded vermiculite for the removal of C. I. Basic Red 9 from aqueous solution: Kinetic, isotherm and thermodynamic studies

Osman Duman, Sibel Tunç, Tülin Gürkan Polat, O. Duman, more

Applied Clay Science > 2015 > 109-110 > Complete > 22-32

The adsorption characteristics of toxic Basic Red 9 (BR9) onto expanded vermiculite were determined. The effect of contact time, initial dye concentration, pH and temperature on the adsorption process was investigated. The adsorption amount of BR9 onto expanded vermiculite increased with increasing initial dye concentration and pH, but it displayed a decrease with increasing temperature. The adsorption...

article

Kinetic study on bonding reaction of gelatin with CdS nanopaticles by UV–visible spectroscopy

Shihua Tang, Baiyang Wang, Youqun Li, S. Tang, more

Spectrochimica Acta Part A: Molecular and Biomolecular Spectroscopy > 2015 > 141 > Complete > 185-192

The chemical kinetics on gelatin-CdS direct conjugates has been systematically investigated as a function of different temperature and reactant concentration (i.e. Cd ² ⁺ , S ² ^- and gelatin) by UV-visible spectroscopy, for the first time. The nonlinear fitting and the differential method were used to calculate the initial rate based on the absorbance-time data. A double logarithmic...

article

Use of chemically activated cotton nut shell carbon for the removal of fluoride contaminated drinking water: Kinetics evaluation

Rajan Mariappan, Raj Vairamuthu, Alagumuthu Ganapathy, R. Mariappan, more

Chinese Journal of Chemical Engineering > 2015 > 23 > 4 > 710-721

Chemically activated cotton nut shell carbons (CTNSCs) were prepared by different chemicals and they were used for the removal of fluoride from aqueous solution. Effects of adsorption time, adsorbent dose, pH of the solution, initial concentration of fluoride, and temperature of the solution were studied with equilibrium, thermodynamics and kinetics of the adsorption process by various CTNSC adsorbents...

article

Impact of the water composition on the degradation kinetics of natural organic matter in photocatalytic membrane reactors

M Rajca

Environment Protection Engineering > 2015 > Vol. 41, nr 1 > 29--39

Decomposition kinetics of natural organic substances during the photocatalytic process with a semi-conductor TiO2 has been investigated. In the study, a laboratory reactor Heraeus and in a photocatalytic membrane reactor were used. Simulated solutions of deionized water, surface water and fulvic acids, differing in composition, were tested in the experiment. In order to determine reaction rate constants,...

article

Comparison of solidification behavior between in situ observation and simulation of Fe–C–Si system

Hector M. Henao, Akira Sugiyama, Kazuhiro Nogita, H.M. Henao, more

Journal of Alloys and Compounds > 2014 > 613 > Complete > 132-138

Over the last few years, important advances have been made in the understanding and modelling of phase transformations of metallic alloys including (a) the coupling of phase equilibria and kinetics for computerised simulation of multicomponent alloys and (b) in situ time resolved X-ray imaging of phase transformations in real time. Both techniques can be complementary. However the quality of the simulation...

article

Development of a RhZrO2 catalyst for low temperature autothermal reforming of methane in membrane reactors

L. Marra, P.F. Wolbers, F. Gallucci, M. van Sint Annaland, more

Catalysis Today > 2014 > 236 > Part A > 23-33

A Rh-based catalyst for low temperature hydrogen generation in membrane microreactor applications has been developed and characterized. A RhZrO ₂ catalyst with 1.4wt% Rh was prepared by incipient wetness impregnation and was tested for both methane reforming and autothermal reforming at temperatures interesting for membrane reactor applications (i.e. temperatures below 700°C and steam-to-carbon...

article

Kinetics of ionic liquid-heteropolyanion salts catalyzed transesterification of oleic acid methyl ester: A study by sequential method

Kaixin Li, Linlu Bai, Yanhui Yang, Xinli Jia, more

Catalysis Today > 2014 > 233 > Complete > 155-161

The kinetics of ionic liquid-heteropolyanion (IL-HPA) salts catalyzed transesterification of oleic acid methyl ester (OAME) was studied via a sequential method. The method can be separated into two parts. The first part was to analyze the kinetics of transesterification of OAME catalyzed by a novel catalyst and to provide a way to simulate the reaction rate profile. The second part was to verify the...

article

Suberoylanilide hydroxamic acid radiosensitizes tumor hypoxic cells in vitro through the oxidation of nitroxyl to nitric oxide

Yuval Samuni, David A. Wink, Murali C. Krishna, James B. Mitchell, more

Free Radical Biology and Medicine > 2014 > 73 > Complete > 291-298

The pharmacological effects of hydroxamic acids are partially attributed to their ability to serve as HNO and/or NO donors under oxidative stress. Previously, it was concluded that oxidation of the histone deacetylase inhibitor suberoylanilide hydroxamic acid (SAHA) by the metmyoglobin/H ₂ O ₂ reaction system releases NO, which was based on spin trapping of NO and accumulation of nitrite...

article

In situ speciation of sulfur vapors by X-ray absorption near edge structure spectroscopy

Annette Summers Engel, Gudrun Lisa Bovenkamp, Alexander Prange, Josef Hormes, more

Chemical Geology > 2014 > 380 > Complete > 1-6

Despite the tremendous importance for geologic systems, there is limited knowledge of sulfur-containing gas-phase geochemical reactions that take place at elevated temperatures, including up to 1000K. This deficit is at least partly caused by a lack of suitable experimental techniques to monitor and quantify potential reactions. We developed a new furnace design that can heat solid samples to specific...

article

Process optimization of thermal regeneration of spent coal based activated carbon using steam and application to methylene blue dye adsorption

Duan Xin-hui, C. Srinivasakannan, Liang Jin-sheng, D. Xin-hui, more

Journal of the Taiwan Institute of Chemical Engineers > 2014 > 45 > 4 > 1618-1627

Spent coal based activated carbon from the silicon industry has been regenerated using thermal regeneration technique with steam as activating agent. The response surface methodology (RSM) technique is applied to optimize the regeneration process. The optimization is performed for maximizing the carbon yield and the iodine adsorption capacity. The optimized conditions are observed to be a regeneration...

article

Kinetics of extraction of uranium from phosphoric acid by D2EHPA–TBP and D2EHPA–TOPO systems using constant interfacial area stirred cell

O.D. Gadgil, V.H. Dalvi, K.T. Shenoy, H. Rao, more

Chemical Engineering Science > 2014 > 110 > Complete > 169-184

The uranium extraction kinetics with Di-2-Ethyl Hexyl Phosphoric Acid-Tri Butyl Phosphate (D2EHPA–TBP) and Di-2-Ethyl Hexyl Phosphoric Acid-Tri Octyl Phosphine Oxide (D2EHPA–TOPO) dissolved in dodecane has been investigated. The objective of the present study was to identify the reaction location, reaction regime, reaction orders with respect to the reactants and the intrinsic rate constant of the...

article

Kinetics of biofuel generation from deodorizer distillates derived from the physical refining of olive oil and squalene recovery

M.C. Gutiérrez, J.A. Siles, A.F. Chica, M.A. Martín, more

Biomass and Bioenergy > 2014 > 62 > Complete > 93-99

The recovery of squalene from deodorizer distillate derived from the physical refining of olive oil was evaluated by combining pressurized acidic esterification in a closed system with vacuum distillation. Esterification was carried out at 341, 359, 366, 391 and 395 K. The reaction at 395 K was found to be satisfactory as it decreased the acid value by 99.21% and generated a FAME concentration of...

article

Aqueous thermal desorption as an effective way to regenerate spent activated carbons

B. Ledesma, S. Román, E. Sabio, A. Álvarez-Murillo, more

The Journal of Supercritical Fluids > 2014 > 85 > Complete > 24-30

This work deals with the regeneration of p-Nitrophenol (PNP) loaded Activated Carbons by means of aqueous thermal desorption.Continuous desorption experiments were performed under different temperature (140–200°C) and stirring (100–600rpm) conditions. The study was made with a double point of view; firstly, desorption kinetics was analyzed by applying non-linear Lagergren model. Secondly, the improvements...

article

Quantitative Raman spectroscopy as a tool to study the kinetics and formation mechanism of carbonates

L.J. Bonales, V. Muñoz-Iglesias, D. Santamaría-Pérez, M. Caceres, more

Spectrochimica Acta Part A: Molecular and Biomolecular Spectroscopy > 2013 > 116 > Complete > 26-30

We have carried out a systematic study of abiotic precipitation at different temperatures of several Mg and Ca carbonates (calcite, nesquehonite, hydrocalcite) present in carbonaceous chondrites. This study highlights the capability of Raman spectroscopy as a primary tool for performing full mineralogical analysis. The precipitation reaction and the structure of the resulting carbonates were monitored...

article

Formation of Pt silicide on doped Si: Kinetics and stress

Omar Abbes, Khalid Hoummada, Dominique Mangelinck, Véronique Carron, more

Thin Solid Films > 2013 > 542 > Complete > 174-179

In situ experiments based on X-ray diffraction, sheet resistance and differential scanning calorimetry were performed on Pt thin films deposited on Si either undoped or doped with As (n type) or B (p type). In all cases, these measurements show a sequential formation of Pt ₂ Si followed by PtSi phases. Simulations of the kinetics show that the growth is controlled by both the interface and...

article

The Chemistry of (U,Pu)O2 Dissolution in Nitric Acid

M.J. Carrott, P.M.A. Cook, O.D. Fox, C.J. Maher, more

Procedia Chemistry > 2012 > 7 > Complete > 92-97

The focus of this paper is the chemistry of mixed uranium plutonium oxide (MOx,) in nitric acid. An overview of dissolution chemistry is discussed by comparing the differences in the dissolution characteristics of uranium and plutonium oxides. An overview of batch dissolution experiments, studying the dissolution chemistry of high surface area MOx powders and low surface area MOx pellets with reference...

article

Indomethacin sustained release pellets prepared by extrusion-spheronization

G.M. Mahrous, M.A. Ibarhim, M. El-Badry, F.K. Al-Anazi, more

Journal of Drug Delivery Science and Technology > 2010 > 20 > 2 > 119-125

Gastrointestinal side effects may interrupt essential therapy with indomethacin, a non-steroidal anti-inflammatory drug. Formulation of this drug into sustained release multiparticulate form may reduce some of these side effects by avoiding contact of drug crystals with gastrointestinal mucosa at high concentrations, as may happen with immediate release dosage forms. Indomethacin (IM) sustained release...

article

Conjugation of aspirin with vitamin C: uptake and stability studies

A. Dalpiaz, B. Pavan, M. Strada, C. Biondi, more

Journal of Drug Delivery Science and Technology > 2009 > 19 > 1 > 43-50

Aspirin and its prodrug obtained as conjugate with vitamin C (AA-Asp) were evaluated on human retinal pigment epithelium (HRPE) cells to investigate their ability to interact with the ascorbate transporter SVCT2 and their cellular uptake. Furthermore, stability in physiological fluids of these compounds was investigated. Transport and inhibition assays were performed by adding [ ¹⁴ C]AA and...

INFONA - science communication portal

Search results

Biosorption of Pb(II) by the resistant Enterobacter sp.: Investigated by kinetics, equilibriumand thermodynamics

Characterization and Diffusion Kinetics of the Plasma Paste Borided AISI 440C Steel

Determination of adsorptive properties of expanded vermiculite for the removal of C. I. Basic Red 9 from aqueous solution: Kinetic, isotherm and thermodynamic studies

Kinetic study on bonding reaction of gelatin with CdS nanopaticles by UV–visible spectroscopy

Use of chemically activated cotton nut shell carbon for the removal of fluoride contaminated drinking water: Kinetics evaluation

Impact of the water composition on the degradation kinetics of natural organic matter in photocatalytic membrane reactors

Comparison of solidification behavior between in situ observation and simulation of Fe–C–Si system

Development of a RhZrO2 catalyst for low temperature autothermal reforming of methane in membrane reactors

Kinetics of ionic liquid-heteropolyanion salts catalyzed transesterification of oleic acid methyl ester: A study by sequential method

Suberoylanilide hydroxamic acid radiosensitizes tumor hypoxic cells in vitro through the oxidation of nitroxyl to nitric oxide

In situ speciation of sulfur vapors by X-ray absorption near edge structure spectroscopy

Process optimization of thermal regeneration of spent coal based activated carbon using steam and application to methylene blue dye adsorption

Kinetics of extraction of uranium from phosphoric acid by D2EHPA–TBP and D2EHPA–TOPO systems using constant interfacial area stirred cell

Kinetics of biofuel generation from deodorizer distillates derived from the physical refining of olive oil and squalene recovery

Aqueous thermal desorption as an effective way to regenerate spent activated carbons

Quantitative Raman spectroscopy as a tool to study the kinetics and formation mechanism of carbonates

Formation of Pt silicide on doped Si: Kinetics and stress

The Chemistry of (U,Pu)O2 Dissolution in Nitric Acid

Indomethacin sustained release pellets prepared by extrusion-spheronization

Conjugation of aspirin with vitamin C: uptake and stability studies

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