scholarly journals THE IMPACT OF ACID ACTIVATION PARAMETERS OF DARK BROWN LOAM ON ITS SORPTION PROPERTIES TO CHROMIUM (III) IONS

2012 ◽  
Vol 53 (4) ◽  
Author(s):  
Є.О. Бовсуновський ◽  
О.В. Рябчевський ◽  
Ю.Я. Годовська ◽  
О.Г. Личманенко
Keyword(s):  
Activation Parameters ◽  
Sorption Properties ◽  
Acid Activation ◽  
The Impact

The Impact of Concomitant Chronic Pancreatitis on Prooxidant-antioxidant Status and Other Conditions in Osteoarthritis

2016 ◽  
pp. 75-78
Author(s):  
Liliia Babynets ◽  
Tetiana Maevska
Keyword(s):  
Oxidative Stress ◽  
Lipid Peroxidation ◽  
Superoxide Dismutase ◽  
Chronic Pancreatitis ◽  
Functional Capacity ◽  
Antioxidant Status ◽  
Activation Parameters ◽  
Tissue Destruction ◽  
The Impact ◽  
Stress Accumulation

The study proved that patients with combined progress of osteoarthritis and chronic pancreatitis have reliable top-level activation of lipid peroxidation in terms of malonyc aldehyde and tissue destruction in terms of oxyproline, weakening of the antioxidant level (in terms of superoxide dismutase and SH-groups) and activation parameters of catalase and ceruloplasmin (p<0,05). The authentic predictority of patients biological age, duration of combined clinical courses, the functional capacity of the pancreas in terms of fecal α-elastase, structural state by ultrasound criteria for progression effects of oxidative stress, accumulation oxyproline activation parameters catalase and ceruloplasmin, which statistically was reflected by the presence of mainly moderate of significant correlations between these groups of indicators have been identified.

scholarly journals ADSORPTION POTENTIAL FOR A MIXTURE OF CHEMICALLY AND THERMALLY TREATED CLAYS TO REMOVE ORANGE G DYE FROM WASTE-WATER

2021 ◽  
Vol 13 (2) ◽  
pp. 10-31
Author(s):  
Saba A. Saeed1 ◽  
◽  
Dunya E. AL-Mammar2 ◽  
Keyword(s):  
Adsorption Process ◽  
Isotherm Models ◽  
Batch Adsorption ◽  
Alkali Activation ◽  
Acid Activation ◽  
Solution Ph ◽  
Adsorption Method ◽  
Orange G ◽  
Hoff Equation ◽  
The Impact

This study examined the adsorption behavior of anionic dye (orange G) from aqueous solution onto the raw and activated a mixture of illite, kaolinite and chlorite clays from area of Zorbatiya (east of Iraq).The chemical treatment involved alkali and acid activation. The alkali activation obtained by treated the raw clay (RC) with 5M NaOH (ACSO) and the acid activation founded by treated it with 0.25M HCl (ACH) and 0.25M H_2 〖SO〗_4 (ACS). The thermal treatment carried out by calcination the produce activated clay at 750oC for acid activation and 105oC for alkali activation. Batch adsorption method was used to study the adsorption of orange G dye onto raw and activated clays. The impact of different factors related to the adsorption process was studied such as: agitation time, clay dosage, solution pH, starting OG dye concentration, temperature and ionic strength. The adsorption process was described by using Langmuir, Freundlich, Temkin and Dubinin-Raduchkevish isotherm models. Thermodynamic functions like change in enthalpy〖∆H〗^°, change in entropy 〖∆S〗^° and change in Gibbs free energy 〖∆G〗^°were estimated based on Vanʼt Hoff equation.

scholarly journals The Impact of an Inert Gas Atmosphere on the Kinetics of Changes in the Physical and Chemical Properties of Carrot Lyophilisate

2019 ◽  
Vol 16 (1-2) ◽  
Author(s):  
D. Nowak
Keyword(s):  
Cross Sections ◽  
Storage Time ◽  
Chemical Properties ◽  
Sorption Properties ◽  
Carotenoid Content ◽  
Freeze Dried ◽  
Gas Atmosphere ◽  
Colour Parameters ◽  
Physical And Chemical ◽  
The Impact

AbstractThe purpose of this study was to analyse the impact of blanching, the atmosphere of nitrogen and storage time on carotenoids content, colour and sorption properties of freeze-dried carrot. The material was stored for up to 16 weeks, in the dark, at room temperature. The colour was measured on the surface and in cross sections. As the storage time increased, there was a continual decrease in the carotenoids content in the carrot packed in atmospheric air. In the carrots packed in the atmosphere of nitrogen, no changes in carotenoid content were observed. The colour parameters correlated with the changes in the carotenoids content. The colour parameters changed on the surface and in cross sections in the same manner. During storage, a significant decrease in sorption properties of freeze-dried carrots was noted after 2 weeks of storage.

The effect of oxalic acid activation on the bleaching properties of a bentonite from Milos Island, Greece

Clay Minerals ◽  
2014 ◽  
Vol 49 (4) ◽  
pp. 541-549 ◽  
Author(s):  
M. Taxiarchou ◽  
I. Douni
Keyword(s):  
Oxalic Acid ◽  
Bleaching Earth ◽  
Activation Parameters ◽  
Pulp Density ◽  
Acid Activation ◽  
Activation Time ◽  
Industrial Use ◽  
Activation Conditions ◽  
Activation Times ◽  
Better Than

AbstractA bentonite from Milos, Greece, was activated with oxalic acid and the effect of acid activation conditions on bleaching of sunflower oil was investigated. The activation parameters studied were temperature, retention time and oxalic acid to bentonite mass ratio. The activated materials produced had good bleaching properties and were suitable for industrial use as bleaching earths. Optimum bleaching properties could be achieved using a variety of combinations of acid to bentonite ratios and activation times. Bleaching efficiency tests indicated that 24 h activation at 100°C with 1m oxalic acid and 25% pulp density (w/v) gave results equivalent to that of a commercial bleaching earth (Tonsil Optimum 210 FF). The combination that is likely to be more preferable on an industrial scale was 100°C, 25% pulp density (w/v), 1m initial oxalic acid concentration, 60% recycling of the oxalate solution (making up an acid to bentonite ratio 0.2 w/w) and 6 h activation time. The materials produced under these conditions have acceptable bleaching properties, corresponding to bleaching capacity greater than 78% compared to commercial Tonsil, and colour index (in red and yellow units) equal or even better than Tonsil.

scholarly journals Environmental Application of Acid Activated Kaolinite-Glauconite Clay Assisted By Microwave Irradiation

2021 ◽  
Author(s):  
Thouraya Turki ◽  
Najoua Frini-Sra ◽  
Ezzeddine Sra
Keyword(s):  
Microwave Irradiation ◽  
Adsorption Process ◽  
Activation Parameters ◽  
Textural Properties ◽  
Langmuir Model ◽  
Acid Activation ◽  
Environmental Application ◽  
Irradiation Power ◽  
Adsorbed Quantity ◽  
Langmuir And Freundlich Models

Abstract Crude kaolinite-glauconite clay was active with hydrochloric acid for various times under variable microwave irradiation power. The influence of activation parameters (power and/or time) on the structural and textural properties of the treated samples has been studied. The modifications were evaluated by XRD, FTIR, XRF, SEM, BET, grain size and zettametry. The XRD and IR results show that acid activation reveals only weak changes on crystallinity of samples. However, HCl activation of clay assisted by microwave modifies morphology and size of grains with a little variation of the specific surface area values. The adsorbing power of the raw and activated clay was tested with methyl orange dye and the adsorption isotherms were modeled using Langmuir and Freundlich models. This study showed that the maximum adsorbed quantity of dye passes from 3.21mg/g for the untreated raw clay to 4.29mg/g for the activated clay irradiated 2 min under microwave at a power of 900W and that the Langmuir model is the most adequate to describe the adsorption process.

NITROGEN AND HUMIC ACID ACTIVATION OF ALUMOSILICATES FOR IMPROVING THE ADSORPTION OF TRITIUM FROM WATER SOLUTIONS

2019 ◽  
pp. 16-20 ◽  
Author(s):  
V. Pushkarev ◽  
I. Rudenko ◽  
O. Zubko ◽  
V. Dolin
Keyword(s):  
Humic Acid ◽  
Aqueous Solutions ◽  
Adsorption Capacity ◽  
Humic Acids ◽  
Nuclear Power ◽  
Effective Means ◽  
Acid Activation ◽  
Series Of Experiments ◽  
Mineral Adsorbents ◽  
The Impact

The urgent problem of protecting the environment from the impact of enterprises of the fuel nuclear power complex is the search for effective means to localize tritium from industrial wastewater. In the practice of preventing environmental pollution with industrial waste, mineral adsorbents, among which a significant place is occupied by bentonite (that is, montmorillonite) and palygorskite clays and minerals from the group of zeolites (clinoptilolites and others) are widely used. To increase the adsorption capacity of mineral adsorbents, various methods for their activation are being developed. To assess the effectiveness of the activation of the adsorption capacity of such mineral adsorbents on the removal of tritium from aqueous solutions, a series of experiments was performed, where nitric and humic acids were used as activators. As a result of the work performed, it was found that acid activation increases the removal of tritium from aqueous solutions by 6% in montmorillonite and 52% in palygorskite. A further modification with humic acid, respectively, increases the removal of tritium from aqueous solutions by montmorillonite by an additional 33% (39% in total) and in palygorskite by 16% (68% in total). Activation of clinoptilolite by nitric and humic acids was not effective in increasing the extraction of tritium from aqueous solutions.

scholarly journals Effect of vehicular traffic, remote sources and new particle formation on the activation properties of cloud condensation nuclei in the megacity of São Paulo, Brazil

2016 ◽  
Vol 16 (22) ◽  
pp. 14635-14656 ◽  
Author(s):  
Carlos Eduardo Souto-Oliveira ◽  
Maria de Fátima Andrade ◽  
Prashant Kumar ◽  
Fábio Juliano da Silva Lopes ◽  
Marly Babinski ◽  
...  
Keyword(s):  
Biomass Burning ◽  
Particle Number ◽  
Cloud Condensation Nuclei ◽  
Activation Parameters ◽  
Particle Formation ◽  
Sea Salt ◽  
Vehicular Emissions ◽  
Vehicular Traffic ◽  
Condensation Nuclei ◽  
The Impact

Abstract. Atmospheric aerosol is the primary source of cloud condensation nuclei (CCN). The microphysics and chemical composition of aerosols can affect cloud development and the precipitation process. Among studies conducted in Latin America, only a handful have reported the impact of urban aerosol on CCN activation parameters such as activation ratio (AR) and activation diameter (Dact). With over 20 million inhabitants, the Metropolitan Area of São Paulo (MASP) is the largest megacity in South America. To our knowledge, this is the first study to assess the impact that remote sources and new particle formation (NPF) events have on CCN activation properties in a South American megacity. The measurements were conducted in the MASP between August and September 2014. We measured the CCN within the 0.2–1.0 % range of supersaturation, together with particle number concentration (PNC) and particle number distribution (PND), as well as trace-element concentrations and black carbon (BC). NPF events were identified on 35 % of the sampling days. Combining multivariate analysis in the form of positive matrix factorization (PMF) with an aerosol profile from lidar and HYSPLIT model analyses allowed us to identify the main contribution of vehicular traffic on all days and sea salt and biomass burning from remote regions on 28 and 21 % of the sampling days, respectively. The AR and Dact parameters showed distinct patterns for daytime with intense vehicular traffic and nighttime periods. For example, CCN activation was lower during the daytime than during the nighttime periods, a pattern that was found to be associated mainly with local road-traffic emissions. A decrease in CCN activation was observed on the NPF event days, mainly due to high concentrations of particles with smaller diameters. We also found that aerosols from sea salt, industrial emissions, and biomass burning had minor effects on Dact. For example, nights with biomass burning and vehicular emissions showed slightly lower CCN activation properties than sea-salt, industrial and non-event nights. Our results show that particulate matter from local vehicular emissions during the daytime has a greater effect on CCN activation parameters than that from remote sources.

scholarly journals Effective Sorption of Europium Ions by Interpolymer System Based on Industrial Ion-Exchanger Resins Amberlite IR120 and AB-17-8

Materials ◽  
2021 ◽  
Vol 14 (14) ◽  
pp. 3837
Author(s):  
Talkybek Jumadilov ◽  
Khuangul Khimersen ◽  
Zamira Malimbayeva ◽  
Ruslan Kondaurov
Keyword(s):  
Atomic Emission ◽  
Exchange Capacity ◽  
Sorption Properties ◽  
Strong Increase ◽  
Ion Exchangers ◽  
Molar Ratios ◽  
Remote Interaction ◽  
Exchange Resins ◽  
The Impact ◽  
Interaction Phenomenon

The research is aimed at checking the impact of a remote interaction phenomenon on growth of sorption properties of ion-exchange resins during sorption of europium ions. Industrial ion exchangers Amberlite IR120 and AB-17-8 were selected as objects for the study. Investigation was undertaken using the following physico-chemical methods of analysis: conductometry, pH-metry, colorimetry, Fourier transform infrared (FTIR) spectroscopy, thermogravimetric analysis (TGA), and atomic emission spectroscopy. Remote interaction of the initial ion exchangers in the interpolymer system leads to their transition into highly ionized state due to formation of optimal conformation. Found that high ionization areas of Amberlite IR120 and AB-17-8 are the molar ratios Amberlite IR120:AB-17-8 = 4:2 and 1:5. The remote interaction effect provides significant increase of the following sorption properties: sorption degree, polymer chain binding degree, effective dynamic exchange capacity. A strong increase of the sorption properties (average increase for all time of remote interaction is over 50%) in the interpolymer system Amberlite IR120-AB-17-8 was observed with individual polymer structures of Amberlite IR120 and AB-17-8. The remote interaction phenomenon can be successfully used for effective modification of industrial ion exchangers for sorption of rare-earth metals.

Sorption Properties of Nanostructured Calcium Aluminosilicate with Respect to Cesium Ions

2017 ◽  
Vol 265 ◽  
pp. 518-523
Author(s):  
P.S. Gordienko ◽  
S.B. Yarusova ◽  
I.A. Shabalin ◽  
V.A. Dostovalov
Keyword(s):  
Living Environment ◽  
Sorption Properties ◽  
Half Cycle ◽  
Maximum Sorption Capacity ◽  
Cesium Ions ◽  
Ion Sorption ◽  
Maximum Sorption ◽  
Calcium Aluminosilicate ◽  
The Impact ◽  
Calcium Aluminosilicates

Long–lived 134Cs and 137Cs isotopes with half-cycle of 2.06 and 30 years respectively refer to the most dangerous and wide-spread radionuclides in ecological facilities. The efficient way of removing cesium radioisotopes from the living environment is to bind them into the compounds insoluble in water. This paper presents the findings on the sorption properties of synthetic nanostructured calcium aluminosilicates (CAS) with AI:Si correlation equal to 2:2, 2:6, 2:10 and obtained in CaCI2—AICI3—КОН--SiO2—H2O multiple-component system. An isotherm investigation of cesium ion sorption produced from aqueous solution with Cs+1 from 0.2 till 6.0 mmol/L-1 concentration was carried out. Maximum sorption capacity of calcium aluminosilicates (CAS) as well as Langmuir constant was defined. The kinetics data was received and the activation energy of cation exchange in the process of sorption was estimated. The impact of 1% КCI + 6% NaCI saline background on the values of interfacial distribution coefficient (Kd) and recovery rate of cesium ions were determined.

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