DSpace Arşivi :: by Yazar "Pehlivan, Erol" değerine göre listeleniyor

Yazar "Pehlivan, Erol" seçeneğine göre listele

Listeleniyor 1 - 20 / 54

Adhesive and Anticorrosive Polymeric Coatings Obtained From Modified Industrial Waste Oligostyrenes
(Elsevier Science Sa, 2006) Ahmetli, Gulnare; Şen, Nejdet; Pehlivan, Erol; Durak, Sancaktar
In this study, as a continuation of our previous studies on the chemical modification of different molecular weight polystyrenes (PS) with polyfunctionalized modifiers by using cationic catalyst, industrial waste oligostyrenes (IWOS) were used as raw material. These oligostyrenes are formed as waste material in the rectification of styrene, used for the production of PS in industry, and they cause environmental pollution. Chemical modification of these waste oligomers (IWOS) without waste residence was carried out with polyfunctional modifiers such as maleic (MA) and acetic anhydrides (AA) by using (BF3O)-O-.(C2H5)(2) catalyst in a single stage. Upon modification, it was determined that a maximum amount of functional groups (-COOH group 130 mg KOH/g polymer and 18 mol% CH3CO-group) was bonded to the structure of the oligostyrenes. Adhesion properties, corrosion resistance and impact of the polymeric coatings on metal surface changed as a result of the amount and structure of the polyfunctional groups bound to the polymer structure. It was determined that the modified IWOS had higher adhesion properties; and it was more resistant to corrosion and impact. Therefore, more economical resistant polymeric coatings were obtained; and their application areas were located by using this waste as raw material in polymeric reactions. (c) 2005 Elsevier B.V. All rights reserved.
Adsorption of Cu(II), Zn(II), Ni(II), Pb(II), and Cd(II) from aqueous solution on amberlite IR-120 synthetic resin
(ACADEMIC PRESS INC ELSEVIER SCIENCE, 2005) Demirbaş, Ayhan; Pehlivan, Erol; Göde, Fethiye; Altun, Türkan; Arslan, Gülşin
The adsorption of copper(II), zinc(II), nickel(II), lead(II), and cadmium(II) on Amberlite IR-120 synthetic sulfonated resin has been studied at different pH and temperatures by batch process. The effects of parameters such as amount of resin, resin contact time, pH, and temperature on the ion exchange separation have been investigated. For the determination of the adsorption behavior of the resin, the adsorption isotherms of metal ions have also been studied. The concentrations of metal ions have been measured by batch techniques and with AAS analysis. Adsorption analysis results obtained at various concentrations showed that the adsorption pattern on the resin followed Freundlich isotherms. Here we report the method that is applied for the sorption/separation of some toxic metals from their solutions. (C) 2004 Elsevier Inc. All rights reserved.
Adsorption of Cu2+ and Pb2+ ion on dolomite powder
(ELSEVIER SCIENCE BV, 2009) Pehlivan, Erol; Ozkan, Ali Mujdat; Dinc, Salih; Parlayici, Serife
Natural Turkish dolomite was shown to be effective for removing Cu2+ and Pb2+ from aqueous solution. Selected information on pH, dose required, initial metal concentration, adsorption capacity of the raw dolomite powder was evaluated for its efficiency in adsorbing metal ions. Dolomite exhibited good Cu2+ and Pb2+ removal levels at all initial metal amount tested (0.04-0.32 mmol, 20 mL). It is important to note that the adsorption capacities of the materials in equilibrium vary, depending on the characteristics of the individual adsorbent, the initial concentration of the adsorbate and pH of the solution. One hour was enough for the removal of metal ions from (0.2 mmol in 20 mL) aqueous solution. Effective removal of metal ions was demonstrated at pH values of 5.0. The adsorptive behavior of dolomite was described by fitting data generated from the study of the Langmuir and Freundlich isotherm models. The adsorption capacity of dolomite was found as 8.26 mg for Cu2+ and 21.74 mg for Pb2+, respectively, from the calculation of adsorption isotherm equation. More than 85% of studied cations were removed by dolomite from aqueous solution in single step. The mechanism for cations removal by dolomite includes surface complexation and ion exchange. (C) 2009 Elsevier B.V. All rights reserved.
Analysis of Polychlorinated Dibenzofurans (PCDFs) in Fly-Ash From a Waste Incineration Plant
(PRESTON PUBLICATIONS INC, 1994) Pehlivan, Mustafa; Pehlivan, Erol; Kara, Hüseyin
In this study, a method for the congener-specific analysis of polychlorinated dibenzofurans (PCDFs) in fly ash from a waste incineration plant is described. This method involves extraction, column chromatography, and gas chromatographic-mass spectrometric techniques. Representative fly ash samples are obtained from the waste incinerator. The purpose of this research is to briefly present the findings as they relate to PCDFs. Analyses indicate that PCDFs are consistently found in the municipal incinerator.
Batch removal of chromium(VI) from aqueous solution by Turkish brown coals
(ELSEVIER SCI LTD, 2007) Arslan, Gulsin; Pehlivan, Erol
The ability of using low-rank Turkish brown coals (Ilgin: BC1, Bey ehir: BC2, and Ermenek: BC3) to remove Cr(VI) from aqueous solutions was studied as a function of contact time, solution pH, temperature, concentration of metal solutions and amount of adsorbent. Their sorption properties were compared with the activated carbon from Chemviron (AQ-30). Adsorption of Cr(VI) uptake is in all cases pH-dependent showing a maximum at equilibrium pH values between 2.0 and 3.2, depending on the biomaterial, that correspond to initial pH values of 2.3 units for BC1, 3.0 units for BC2 and 3.2 units for BC3 and AQ-30. Batch equilibrium tests showed that the Cr(VI) removal was fitted with Freundlich isotherm and the adsorption reached equilibrium in 80 min. It was proceeding effectively into a short acid pH interval (2.0-3.2) where processes of Cr(VI) sorption are maximized. It was observed that the maximum adsorption capacity of 11.2 mM of Cr(VI)/g for Ilgin (BC1), 12.4 mM of Cr(VI)/g for Beysehir (BC2), 7.4 mM of Cr(VI)/g for Ermenek (BC3) and 6.8 mM of Cr(VI)/g for activated carbon (AQ-30) was achieved at pH of 3.0. The rise in temperature caused a slight decrease in the value of the equilibrium constant (K-c) for the sorption of Cr(VI) ion. The Cr(VI) sorption capacities of Bey ehir and Ilgin brown coals were the same. Ermenek brown coals and activated carbon (AQ-30) showed a similar sorption capacity. (C) 2006 Elsevier Ltd. All rights reserved.
Biosorption of chromium(VI) ion from aqueous solutions using walnut, hazelnut and almond shell
(2008) Pehlivan, Erol; Altun, Türkan
The potential to remove Cr(VI) ion from aqueous solutions through biosorption using, the shells of Walnut (WNS) (Juglans regia), Hazelnut (HNS) (Corylus avellana) and Almond (AS) (Prunus dulcis) was investigated in batch experiments. The equilibrium adsorption level was determined to be a function of the solution contact time and concentration. Kinetic experiments revealed that the dilute chromium solutions reached equilibrium within 100 min. The biosorptive capacity of the shells was dependent on the pH of the chromium solution, with pH 3.5 being optimal. Adsorption of Cr(VI) ion uptake is in all cases pH-dependent showing a maximum at equilibrium pH values between 2.0 and 3.5, depending on the biomaterial, that correspond to equilibrium pH values of 3.5 for (WNS), 3.5 for (HNS) and 3.2 for (AS). The adsorption data fit well with the Langmuir isotherm model. The sorption process conformed to the Langmuir isotherm with maximum Cr(VI) ion sorption capacities of 8.01, 8.28, and 3.40 mg/g for WNS, HNS and AS, respectively. Percentage removal by WNS, HNS and AS was 85.32, 88.46 and 55.00%, respectively at a concentration of 0.5 mM. HNS presented the highest adsorption capacities for the Cr(VI) ion. © 2007 Elsevier B.V. All rights reserved.
Biosynthesis of Linden Protected Silver Nanoparticles and their Safe Application as a Catalyst for Reduction of Methylene Blue Hydrate
(IEEE, 2017) Ünver, Yasemin; Altun, Türkan; Pehlivan, Erol; Hussain, Masood; Avcı, Ahmet
Green synthetic protocol was developed for fabrication of silver nanoparticles (AgNPs) using linden extract as stabilizing and reducing agent. Green synthetic protocols preferred over other reduction procedures due to its nontoxic, easy, nonexpensive and environmental friendly behavior. The effect of various reaction parameters and additives on morphology such as, concentration of silver nitrate, effect of pH, temperature, volume of extract and stirring rate were optimized in order to achieve small size stable silver nanoparticles by using Ultra Violet-Visible (UV-Vis) spectroscopy. Trasmission electron microscopy (TEM) was performed to study the morphology and dimensions of biologically synthesized silver nanoparticles. TEM study confirmed that the synthesized nanoparticles were spherical in nature having an average size of 24.4 +/- 2nm. The synthesized plant protected AgNPs were applied homogeneously as well as heterogeneously for reduction of methylene blue hydrate (MB) by immobilizing the nanoparticles on small pieces of glass cover slip. These NPs act as an efficient heterogeneous catalyst and completely reduced MB within 8 min.
Characterization of styrene butadiene rubber and microwave devulcanized ground tire rubber composites
(WALTER DE GRUYTER GMBH, 2014) Karabork, Fazliye; Pehlivan, Erol; Akdemir, Ahmet
Ground tire rubber (GTR) was devulcanized by microwaves at the same heating rate (constant power) and different times of exposure. The devulcanized rubber (DVR) and untreated GTR were characterized physically and thermally. Composite materials were prepared from different proportions of the GTR, which was used as a filler, and the DV-R, which was used as part of the styrene butadiene rubber (SBR) matrix, and by varying the exposure time of the microwave power. These composites were compared with a control sample that was prepared from virgin SBR. The sol content (soluble part) and Fourier transform infrared spectroscopy (FTIR) analyses of the devulcanized samples were examined to define the efficiency of devulcanization. The cure characteristics and tensile properties of the SBR composites were researched. In this study, it was found that using DV-R as part of the rubber matrix produced much better properties than using GTR as a filler, thereby showing the significant benefits of microwave devulcanization. At the DV-R content of 50 phr, the elongation at break of the DV-R 5 min/SBR composites increased to 445.06% from 217.25% for the GTR/SBR composites, i.e., the elongation at break was enhanced by 105% by the devulcanization of GTR. Scanning electron microscopy (SEM) photographs displayed a better interface coherence between the DV-R 5 min and SBR matrix than the GTR/SBR composites.
Chemical synthesis of single-layer graphene by using ball milling compared with NaBH4 and hydroquinone reductants
(INST ENGINEERING TECHNOLOGY-IET, 2018) Niftaliyeva, Aysel; Pehlivan, Erol; Polat, Safa; Avci, Ahmet
Graphene materials especially single-layer graphene have been identified as a new generation of nanomaterials having various potential applications in material industries. However, the synthesis procedure of single-layer graphene to improve its quality, size and amount has been still under research for commercial applications. The graphene oxide (GO) is synthesised from graphite by Hummer's spontaneous approach which is the most suitable reaction for a large-scale production. For the single-layer graphene, in this work, GO was exfoliated by using a ball milling in an inert atmosphere. Owing to using ball milling as intermediate treatment degreased oxygen functional groups and number of layers, it facilitates to synthesise graphene. Sodium borohydride (NaBH4) and hydroquinone were used as a reductant for the chemical conversion of the exfoliated GO to graphene. The results showed that due to the strong reduction feature, both reducing agents can be applied in the graphene production. As a preferred reductant, hydroquinone can be successfully applied for the synthesis of the single-layer graphene compared to NaBH4. The obtained graphene particles by two different chemicals were characterised by various analytical techniques. The big difference in the structure of GO and graphene was observed in transmission electron microscope analysis.
Chromium(VI) Adsorption by Brown Coals
(Taylor & Francis Inc, 2006) Göde, Fethiye; Pehlivan, Erol
The ability of brown coals (leonardites) to remove chromium(VI) from aqueous solutions was studied as a function of pH, contact time, adsorbent nature, and concentration of metal solutions. The adsorption of Cr(VI) was higher between pH 2.0 and 3.0 for all brown coals and maximum sorption was observed at pH 3.0. The Langmuir adsorption isotherm was used to describe observed sorption phenomena, and the constants were evaluated. The maximum adsorption capacity of 0.92 mmol of Cr(VI)/g for YK, 0.98 mmol of Cr(VI)/g for KK was found from experimental data. KK was the best among the selected adsorbents for the sorption of Cr(VI) at pH 3 and the sorption was 81% out of 100 ppm Cr(VI) after 120 min of stirring.
Column Chromatography and Kinetics of Nucleosides and Nucleic-Acid Bases on Immobilized Nickel-Cdae-Sporopollenin and Cobalt-CDAE-Sporopollenin
(MARCEL DEKKER INC, 1994) Pehlivan, Erol; Yıldız, Salih
Sporopollenin, a natural polymer, has been modified for application as a ligand-exchange material. The ligand-exchange chromatography with the functionalized Lycopodium clavatum is a useful method for the rapid separation of nucleosides and nucleic acid bases. The synthesis of tris(carboxymethyl) ethylene diamine Lycopodium clavatum has been described. The resin contained functional diaminoethane and carboxyl groups. Nickel(II) and cobalt(II) metal ions can easily be immobilized on this carboxylated-diamino-ethyl (CDAE)-sporopollenin. Physicochemical and chelating properties of Lycopodium clavatum have been studied extensively. Ligand-exchange chromatography of CDAE-sporopollenin has also been compared to the conventional synthetic chelex-100 resin. The kinetics of cytidine in CDAE-sporopollenin resin has been investigated. The rate measurements have been made by a potentiometric technique. The relative rates at which nucleosides bind to the resin are determined by the actual chemical-exchange reaction between ligands and resin.
A Comparative Study of Two Chelating Ion-Exchange Resins for the Removal of Chromium(III) From Aqueous Solution
(Elsevier Science Bv, 2003) Gode, F. ; Pehlivan, Erol
Macroporous resins containing iminodiacetic acid (IDA) groups (Lewatit TP 207 and Chelex-100) were investigated as a function of concentration, temperature and pH for their sorption properties towards chromium(III). The chromium(III) ions sorbed onto the resin and in the equilibrium concentration were determined by inductively coupled plasma spectrophotometer. The maximum sorption for chromium ions was observed at pH 4.5. Solution pH had a strong effect on the equilibrium constant of Cr(III). The equilibrium constants were 320 and 7 at pH value 4.5 for Lewatit TP 207 and Chelex-100 resin, respectively. The Langmuir isotherm was used to describe observed sorption phenomena. Both the sorbents had high bonding constants with Lewatit TP 207 showing stronger binding. The equilibrium related to adsorption capacity and energy of adsorption was obtained by using plots of Langmuir adsorption isotherm. It was observed that the maximum adsorption capacity of 0.288 mmol of Cr(III)/g for Chelex-100 and 0.341 mmol of Cr(III)/g for Lewatit TP 207 was achieved at pH of 4.5. The rise in temperature caused a slight increase in the value of the equilibrium constant (K,) for the sorption of chromium(RI) ion. (C) 2003 Elsevier Science B.V. All rights reserved.
Comparison of Adsorption Capacity of Young Brown Coals and Humic Acids Prepared From Different Coal Mines in Anatolia
(Elsevier Science Bv, 2006) Pehlivan, Erol; Arslan, Gülşin
Binding of Zn2+ and Cd2+ cations to relatively young brown coals YBC (lignite), humic acids (HAs) and commercial humic acid (CHA) were studied in aqueous media at pH 2.7-6 by polarographic method. This study was conducted to evaluate the removal of heavy metals in an aquatic system without prior treatment. The general principles of cation binding to YBC and humic materials are discussed. Sorption of heavy metal ions (Zn2+ and Cd2+) on samples of YBCs from three areas (Ilgin, Beysehir, and Ermenek) in the vicinity of the city of Konya in Anatolia (Turkey) were compared with sorption of these metal ions on HAs, prepared from these YBCs. The ability of both types of sorbent to remove metals from aqueous solutions was studied as a function of pH and concentration of initial metal solutions. Sorption depends strongly on pH, the origin of the YBC and on the nature of the metal ion. Whereas, for YBCs the main ligand groups seem to be carboxylate ions, this is not the case for the HA polymers. prepared from three YBCs, which differ substantially from properties of commercial samples of "HA". The process is very efficient especially in the case of low concentrations of pollutants in water, where common methods are either economically unfavorable or technically complicated. Of the two metal ions examined, Cd2+ was found to form the most stable HA complexes, followed by Zn. Effective removal of metals was demonstrated at pH-values of 5-5.7. The adsorption isotherm was measured at 25 degrees C, using adsorptive solutions at the optimum pH-value to determine the adsorption capacity. An important aspect of the proposed method was that the removal was performed on several metals at a pH-range in which a given metal undergoes an adsorption process making the method useful for wastewater treatment.
Cr6+ removal using oleaster (Elaeagnus) seed and cherry (Prunus avium) stone biochar
(ELSEVIER SCIENCE BV, 2017) Kahraman, Hawa Tutar; Pehlivan, Erol
In this study biochar was selected as the supporting media for the adsorption of hexavalent chromium (Cr6+). Biochar is a favored adsorbent due to its high surface area and pore volume. It has created using a pyrolysis process, heating biomass in a low oxygen environment. Two types of agricultural waste, oleaster seed biochar (OSBC) and cherrystone biochar (CSBC) were prepared by using the carbonization method. Structure of biochars was analyzed via the SEM, FTIR analyses and surface area of the biochars was determined by BET analysis. Adsorption performances of biochars were examined by the batch type reactors. The effect of the initial pH Cr6+ concentration, adsorbent amount and contact time on the adsorption process were studied. The maximum amount of removed Cr6+ ions from the solution within 150 min was found to be 84.2% for OSBC, 81.3% within 180 min for CSBC when the initial pH of the solution was maintained at 1.5. Kinetic adsorption of chromium onto biochars was elucidated. The experimental data followed the pseudo-second-order rate kinetics. (C) 2016 Elsevier B.V. All rights reserved.
Determination of some inorganic metals in edible vegetable oils by inductively coupled plasma atomic emission spectroscopy (ICP-AES)
(CONSEJO SUPERIOR INVESTIGACIONES CIENTIFICAS-CSIC, 2008) Pehlivan, Erol; Arslan, Gülşin; Göde, Fethiye; Altun, Türkan; Özcan, M. Musa
Seventeen edible vegetable oils were analyzed spectrometrically for their metal (Cu, Fe, Mn, Co, Cr, Pb, Cd, Ni, and Zn) contents. Toxic metals in edible vegetable oils were determined by Inductively Coupled Plasma Atomic Emission Spectrometry (ICP-AES). The highest metal concentrations were measured as 0.0850, 0.0352, 0.0220, 0.0040, 0.0010, 0.0074, 0.0045, 0.0254 and 0.2870 mg/kg for copper in almond oil, for iron in corn oil-(c), for manganese in soybean oil, for cobalt in sunflower oil-(b) and almond oil, for chromium in almond oil, for lead in virgin olive oil, for cadmium in sunflower oil-(e), for nickel almond oil and for zinc in almond oil respectively. The method for determining toxic metals in edible vegetable oils by using ICP-AES is discussed. The metals were extracted from low quantities of oil (2-3 g) with a 10% nitric acid solution. The extracted metal in acid solution can be injected into the ICP-AES. The proposed method is simple and allows the metals to be determined in edible vegetable oils with a precision estimated below 10% relative standard deviation (RSD) for Cu, 5% for Fe, 15% for Mn, 8% for Co, 10% for Cr, 20% for Pb, 5% for Cd, 16% for Ni and 11% for Zn.
Development of an epoxy based intumescent system comprising of nanoclays blended with appropriate formulating agents
(ELSEVIER SCIENCE SA, 2015) Kahraman, Havva Tutar; Gevgilili, Halil; Pehlivan, Erol; Kalyon, Dilhan M.
A novel intumescent coating technology for metallic surfaces was developed using functionalized clays, which were intercalated and exfoliated into nanodimensions. The nanoclays were formulated in epoxy resins and blended with appropriate additives to design intumescent coatings for metallic surfaces. With the high dispersion of nanoclay the flame retardancy is improved. The extent and the homogeneity of the exfoliation and dispersion of the clay particles were assessed employing small-amplitude oscillatory shear. The performance and properties of the coatings were evaluated by means of fire resistance testing, thermo-gravimetric analysis and mechanical properties. The incorporation of the nanoclays significantly increased the elasticity and the viscosity of the intumescent formulations and improved the fire resistance of the epoxy coatings. It is observed that significant gains in flame retarding properties could be achieved when the clay platelets could be adequately exfoliated and dispersed. (C) 2014 Elsevier B.V. All rights reserved.
An economic removal of Cu2+ and Cr3+ on the new adsorbents: Pumice and polyacrylonitrile/pumice composite
(ELSEVIER SCIENCE SA, 2008) Yavuz, Mustafa; Gode, Fethiye; Pehlivan, Erol; Ozmert, Sema; Sharma, Yogesh C.
In this article, the adsorption of Cu2+ and Cr3+ onto pumice (Pmc) and polyacrylonitrile/pumice (PAn/Pmc) composite has been investigated by using a batch method at room temperature and their adsorption properties were compared. To highlight their application, selected information on pH, initial metal concentration and adsorption capacity of the adsorbents is presented. Depending on the characteristics of the individual adsorbents viz. surface modification, initial concentration of adsorbates, and pH, their adsorption capacities were found to vary. The time required for the removal of metal ions (100-500 mg/g) from aqueous solutions was about 6 h. The experimental data have been analyzed using the Langmuir and Freundlich isotherm models. The results of adsorption were fitted to the Langmuir models and coefficients indicated favorable adsorption of Cu2+ and Cr3+ on the adsorbents. Adsorption of Cu2+ and Cr3+ in the solutions was in following order: (PAn/(Pmc) composite> Pmc). The adsorption capacity of the adsorbents Pmc and (PAn/Pmc) were determined from the isotherms equations and were found to be 0.055 and 0.065 mmol/g for Cu2+ and 0.031 and 0.268 mmol/g for Cr3+, respectively. More than 80% of studied cations were removed by Pmc and 87% (PAn/Pmc), respectively, from aqueous solutions in single step. Effective removal of metal ions was demonstrated at pH values of 8.0. The mechanism for cations removal by the Pmc and (PAn/Pmc) composite includes complexation and sorption. The process is very efficient especially in case of low concentrations of pollutants in aqueous solutions, where common methods are either economically unfavorable or technically complicated. (C) 2007 Elsevier B.V. All rights reserved.
Effects of Different Gas Phases and Gas Bubbles on the Nucleation Kinetics
(SLOVENSKO KEMIJSKO DRUSTVO, 2014) Ceyhan, Ayhan Abdullah; Baytar, Orhan; Pehlivan, Erol
In this study, the effects of different gas phases and gas bubbles on the Induction time were investigated. In the first step, the effects of different kinds of gases (N-2, Ar, dry air-N-2 and dry air-Ar) which are fed into solution-gas interphase and into the solution were determined. After determining the most effective gas upon the Induction time, the next step was to use this gas in the presence of the seed crystals, to specify variation in the Induction time. The experimental results show that gassing and the presence of seed crystal tend to shorten the Induction time as compared to the normal crystallization condition.
Enzyme-free colorimetric sensing of glucose using L-cysteine functionalized silver nanoparticles
(SPRINGER INTERNATIONAL PUBLISHING AG, 2019) Adnan, Sumaira; Kalwar, Nazar Hussain; Abbas, Malik Waseem; Soomro, Razium Ali; Saand, Mumtaz Ali; Awan, Fazli Rabbi; Avcı, Ahmet; Pehlivan, Erol; Bajwa, Sadia
The study demonstrates an efficient, simple and on-site viable approach for sensitive determination of blood glucose using colorimetric sensing approach. The devised colorimetric sensor works based on cysteine functionalized silver nanoparticles. The as-synthesized Ag NPs were elaborately characterized using advanced analytical techniques such as ultra-violet visible spectroscopy, Fourier transform infrared spectroscopy, transmission electron microscopy, atomic force microscopy and X-ray diffraction. The detection of glucose was carried under ambient air conditions where change in the optical characteristics of Ag NPs and subsequent interaction between glucose and functional moiety (i.e. surface bind cysteine) of Ag NPs was considered as the signal response. This interaction led to direct detection of glucose in the concentration range between 0.01 to 0.17 mu M with limit of detection up to 1 x 10(-4) mu M. It is worthwhile mentioning that success of the assay lies in application of the developed colorimetric sensor in real blood glucose measurements, which also proved its capability for field based analysis. In addition its simple design, low cost, and more reliability signifies the usefulness of colorimetric sensor and it can be extended monitor other biologically important molecules.
Evaluation of Amberlite Ira96 and Dowex 1 X 8 Ion-Exchange Resins for the Removal of Cr(VI) From Aqueous Solution
(Elsevier Science Sa, 2010) Edebali, Serpil; Pehlivan, Erol
The removal of Cr(VI) from aqueous solution by two commercially available resins (Amberlite IRA96 and Dowex 1 x 8) was investigated. Batch adsorption processes were carried out as a function of time, adsorbent dosage, pH and temperature to evaluate the performance of the resins. The optimum pH for Cr(VI) adsorption was found as 3.0 for these resins. It was found that more than 93% removal was achieved under optimal conditions. The maximum adsorption capacities are 0.46 and 0.54 mmolig of Amberlite IRA96 and Dowex 1 x 8 resin for Cr(VI) ion, respectively. The suitability of Freundlich and Langmuir adsorption models were investigated for Cr(VI)-resin equilibrium. A pseudo-second order kinetic model has been proposed to correlate the experimental data. The equilibrium adsorption level for Dowex 1 x 8 decreased with increasing temperature, while it increased for Amberlite IRA96.

Yazar "Pehlivan, Erol" seçeneğine göre listele

Sayfa Başına Sonuç

Sıralama seçenekleri