Birleşik Devletler Çevre Koruma Kurumu (USEPA) tarafından belli konsantrasyonlarda birincil çevresel risk olarak kabul edilen bitkisel atık yağların arıtılmayan veya yeterince arıtılmamış olan evsel ve endüstriyel atıkların nehir sularına... more
Birleşik Devletler Çevre Koruma Kurumu (USEPA) tarafından belli konsantrasyonlarda birincil çevresel risk olarak kabul edilen bitkisel atık yağların arıtılmayan veya yeterince arıtılmamış olan evsel ve endüstriyel atıkların nehir sularına deşarjı veya birikmesi ile nehirlerdeki pekçok canlı yok olma tehlikesi ile karşı karşıya gelmektedir. Yağ tüketimi ortalama olarak dünyada kişi başına 15 kg yıl-1 iken ülkemizde 20 kg yıl-1 dir. Ülkemizde yılda yaklaşık 1.5 milyon ton kadar bitkisel yağ kullanılmakta olup bunun yaklaşık 350 bin ton kadarı atık yağ olarak açığa çıkmaktadır. Bitkisel atık yağların % 2’lik kısmı ancak toplanmakta olup son yıllarda çevre bilincinin artması ve lisanslı toplayıcılar ile bu oran ancak % 5’lere çıkarılabilmektedir. Maalesef geri kalan % 95’lik kısım ise kontrolsüz olarak çevreye bırakılmaktadır. Çoğu ülkelerde ve ülkemizde atık yağların çevreye doğrudan salınımı çevresel düzenlemeler ve ağır cezalar ile yasak hale getirilmiştir. Bu çalışmada, bitkisel atı...
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Leaching of ulexite in oxalic acid, which is an organic acid, was studied. The parameters were solid-to-liquid ratio, acid concentration, stirring speed and temperature. The experimental data were applied to the homogeneous and... more
Leaching of ulexite in oxalic acid, which is an organic acid, was studied. The parameters were solid-to-liquid ratio, acid concentration, stirring speed and temperature. The experimental data were applied to the homogeneous and heterogeneous kinetic models to determine the best one. The results showed that the leaching rate increases with increasing reaction temperature, stirring speed, acid concentration, but decreases with solid-to-liquid ratio and particle size. The leaching kinetics of ulexite was determined as the product layer model. The activation energy of the process was calculated. keywords: concrete aggregates, shape, mechanical resistance, mobile plant, fixed plant
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The dissolution of smithsonite in boric acid solutions was investigated. The influence of the reaction temperature, acid concentration, solid-to-liquid ratio, particle size and stirring speed on the zinc extraction were determined in the... more
The dissolution of smithsonite in boric acid solutions was investigated. The influence of the reaction temperature, acid concentration, solid-to-liquid ratio, particle size and stirring speed on the zinc extraction were determined in the experiments. The results show that the dissolution rate increases with increasing acid concentration and reaction temperature, and with decreasing particle size and solid-toliquid ratio. The dissolution results were analyzed by reaction control models. The activation energy of smithsonite in boric acid solution was also calculated.
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Yap lan bu cal mada fosfat kayas nda bulunan karbonatl minerallerin sulu ortamda SO2 gaz ile cozunme kineti i incelenmi tir.Cozundurme i lemlerinde reaksiyon s caklve kar t rma h z parametre olarak secilmi tir. Reaksiyon s cakl oran ve... more
Yap lan bu cal mada fosfat kayas nda bulunan karbonatl minerallerin sulu ortamda SO2 gaz ile cozunme kineti i incelenmi tir.Cozundurme i lemlerinde reaksiyon s caklve kar t rma h z parametre olarak secilmi tir. Reaksiyon s cakl oran ve tanecik boyutunun kuculmesi ile cozunme oran artm t r. Cozunme reaksiyonunun homojen 1. mertebe oldu u ve aktivasyon enerjisinin 21,70 kJ.mol-1 oldu u tespit edilmi tir
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As one of the most prominent anticake agent, SiO2 nanoparticle synthesis method was modified and investigated for a better understanding of the fabrication process. Hence, tetraethoxysilane presursor was subjected to varying synthesis... more
As one of the most prominent anticake agent, SiO2 nanoparticle synthesis method was modified and investigated for a better understanding of the fabrication process. Hence, tetraethoxysilane presursor was subjected to varying synthesis procedures such as concentration change and surface modification ligants. pH value and all the other material composition was kept the same and by implying sol-gel reaction mechanism, basic catalysis and temperature allowed us to obtain spherical and monodispersed nanoparticles. Additionally surface composition which provides hydrophobic character could also be controlled by spontaneous reaction of the long alkyl chain containing alkyltrialkoxysilanes with tetraalkoxysilane. Statistical analysis of the nanoparticle sizes with atomic composition, unveiled that SiO2 nanoparticle size can be modulated sensitively. Monodispersed, spherical and surface controlled nanoparticles seems promising candidated for the applications in sensors, controlled surface co...
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A comparison was made of influence of physically adsorbed methylene blue (MB) dye on the physicochemical properties of Manisa-Akdere zeolite (natural zeolite) and zeolite modified with K and Ca (all samples treated with hydrogen peroxide... more
A comparison was made of influence of physically adsorbed methylene blue (MB) dye on the physicochemical properties of Manisa-Akdere zeolite (natural zeolite) and zeolite modified with K and Ca (all samples treated with hydrogen peroxide before modification) using batch adsorption technique. After elementary characterization of this adsorbent, the effects were investigated of initial MB concentration, pH, contact time, stirring rate, adsorbent dosage and temperature on the selectivity and sensitivity of the removal process. A larger adsorption of the dye was observed for modified zeolite (42.7 mg/g) than for natural zeolite (28.6 mg/g) per gram of an adsorbent after all zeolite samples treated with hydrogen peroxide. Zeolite treated with H 2 O 2 showed higher adsorption capacity than untreated zeolite samples. The Langmuir model (R 2 values between 0.959 and 0.996) fitted the experimental data better than the Freundlich model (R 2 values between 0.804 and 0.988). The adsorption proc...
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The aim of this study was to determine the levels of As, Cd, Mn, Cr, Fe, Pb, Hg, Zn and Se in hair samples collected from the nape of the neck of voluntary people living or working in the industrial region, city center and countryside of... more
The aim of this study was to determine the levels of As, Cd, Mn, Cr, Fe, Pb, Hg, Zn and Se in hair samples collected from the nape of the neck of voluntary people living or working in the industrial region, city center and countryside of Manisa province. The concentrations of As, Cd, Mn, Cr, Fe, Pb, Se, Zn were determined by ICP-OES. The measured values of trace elements in human hair samples were compatible to the reference values given in the literature. The measured values of As, Hg, Cr, Cd, Se and Pb were found below the detection limit of the method. Zn, Mn and Fe were statistically analysed and evaluated. When the Fe and Mn values of the hair samples collected from the industrial region were compared with the data from both the city center and countryside (ANOVA), the differences were meaningful and significant, but the differences for Zn between the industrial region, city center and countryside were found to be insignificant.
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In this study, the optimum conditions of dissolution of calcinated bone in HCl solutions with different concentrations are investigated. Recovery of phosphate from calcinated bone by dissolution with hydrochloric acid solutions was... more
In this study, the optimum conditions of dissolution of calcinated bone in HCl solutions with different concentrations are investigated. Recovery of phosphate from calcinated bone by dissolution with hydrochloric acid solutions was investigated in a batch reactor, it was observed that a 32% hydrochloric acid solution can dissolve the calcinated bone effectively. Using the Taguchi fractional design method, it was
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... 2. M Alkan, MM Kocakerim and S Çolak, Dissolution kinetics of colemanite in water saturated by CO 2 . J Chem Technol Biotechnol 35A (1985), p. 382. ... 4. MM Kocakerim, S Çolak, TW Davies and M Alkan, Dissolution of ulexite in CO 2... more
... 2. M Alkan, MM Kocakerim and S Çolak, Dissolution kinetics of colemanite in water saturated by CO 2 . J Chem Technol Biotechnol 35A (1985), p. 382. ... 4. MM Kocakerim, S Çolak, TW Davies and M Alkan, Dissolution of ulexite in CO 2 -saturated water. ...
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Özet Bu çalýþmada, Manisa ilinin sanayi bölgesi, þehir merkezi ve kýrsal kesimde çalýþan ve/veya yaþayan insanlar arasýndan seçilen gönüllü gruplarýn ense bölgelerinden alýnan saç örneklerinde As, Cd, Cr, Fe, Pb, Hg, Zn, Mn, Se element... more
Özet Bu çalýþmada, Manisa ilinin sanayi bölgesi, þehir merkezi ve kýrsal kesimde çalýþan ve/veya yaþayan insanlar arasýndan seçilen gönüllü gruplarýn ense bölgelerinden alýnan saç örneklerinde As, Cd, Cr, Fe, Pb, Hg, Zn, Mn, Se element düzeylerinin saptanmasý ve bu bölgelerde periyodik karþýlaþtýrmalý aðýr metal izlemesi yapabilmek için ön verilerin oluþturulmasý hedeflenmiþtir. Aðýr metal ölçümleri ICP-OES yöntemi ile yapýlmýþtýr. Saç örneklerinde ölçülen eser elementlerin miktarlarý, literatürde verilen referans deðerler ile uyumlu bulunmuþ olup, As, Hg, Cr, Cd, Se ve Pb sonuçlarý analiz yönteminin belirtme sýnýrýnýn altýnda bulunmuþtur. Zn, Fe ve Mn elementlerinin ölçüm deðerleri istatistiksel olarak deðerlendirilmiþtir. Sanayi bölgesinden toplanan saç örneklerindeki Fe ve Mn deðerleri hem þehir merkezi hem de kýrsal kesime ait ölçüm deðerleriyle karþýlaþtýrýldýðýnda (ANOVA), farklar anlamlý ve önemli bulunmuþtur, fakat bu farklýlýklar þehir merkezine ve kýrsal kesimdeki verilerl...
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In this study, the dissolution kinetics of tincal in phosphoric acid solutions was investigated. The effects of reaction temperature, acid concentration, solid to liquid ratio, particle size and stirring speed were determined in the... more
In this study, the dissolution kinetics of tincal in phosphoric acid solutions was investigated. The effects of reaction temperature, acid concentration, solid to liquid ratio, particle size and stirring speed were determined in the experiments. The results showed that the dissolution rate increased with increasing acid concentration, reaction temperature, stirring speed and increased with decreasing particle size and solid to liquid ratio. The dissolution rate was found to be based on the first order pseudo homogenous reaction model. The activation energy of the tincal in phosphoric acid solution was determined as 42.28 kJ.mol-1.
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... 900 minZ Using these values it was found that 96.15 of P205 was dissolved and 36.0 of the Ca remained in solution. In addition, taking into consideration the amount of P205 dissolved as being maximum, and the amount of Ca and the cost... more
... 900 minZ Using these values it was found that 96.15 of P205 was dissolved and 36.0 of the Ca remained in solution. In addition, taking into consideration the amount of P205 dissolved as being maximum, and the amount of Ca and the cost of the process being 32 Y. Abah et al. ...
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... McCullough et al. [4] reported that monocalcium phosphate gives the following reaction under certain conditions: Ca(H2PO4)2 CaHPO4 + HsPO4 (7) This reaction was investigated in aqueous solution and the P2OsHzOCaO phase diagram was... more
... McCullough et al. [4] reported that monocalcium phosphate gives the following reaction under certain conditions: Ca(H2PO4)2 CaHPO4 + HsPO4 (7) This reaction was investigated in aqueous solution and the P2OsHzOCaO phase diagram was obtained by Elmore and Farr [11 ...
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In this study, the dissolution kinetics of magnesite mineral with Cl2 gas in aqueous media were investigated. The effects of reaction temperature, particle size, solid-to-liquid ratio, gas flow rate and stirring speed on the dissolution... more
In this study, the dissolution kinetics of magnesite mineral with Cl2 gas in aqueous media were investigated. The effects of reaction temperature, particle size, solid-to-liquid ratio, gas flow rate and stirring speed on the dissolution process were determined. It was observed that the dissolution of the magnesite mineral increased with increasing reaction temperature, gas flow rate and stirring speed and
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The dissolution of colemanite waste in oxalic acid solutions was studied in a batch reactor, and the characterization of colemanite waste was determined by X‐ray diffraction analysis and X‐ray Fluorescence analysis. The dissolution... more
The dissolution of colemanite waste in oxalic acid solutions was studied in a batch reactor, and the characterization of colemanite waste was determined by X‐ray diffraction analysis and X‐ray Fluorescence analysis. The dissolution parameters in this study were acid concentration, stirring speed, and reaction temperature, and it was observed that the dissolution rate increased with increasing reaction temperature. The experimental data were examined by using homogeneous and heterogeneous kinetic models, and the dissolution kinetics of the waste was determined to be a pseudo‐first‐order homogeneous reaction control model. The activation energy of colemanite waste in oxalic acid solution was calculated to be 27.80 kJ/mol. Thus, pure boric acid crystals can be produced using of colemanite waste, and this can benefit the environment and the economy. © 2013 American Institute of Chemical Engineers Environ Prog, 33: 1111–1116, 2014
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Bu çalışmada, atmosferik basınçta sülfürik asit çözeltisinde Meta Nikel Şirketi’ den (Gördes - Manisa) elde edilen lateritik cevherinin çözünmesi için optimum koşulları belirlemek amacıyla Taguchi Fraksiyonel Tasarım Yöntemi... more
Bu çalışmada, atmosferik basınçta sülfürik asit çözeltisinde Meta Nikel Şirketi’ den (Gördes - Manisa) elde edilen lateritik cevherinin çözünmesi için optimum koşulları belirlemek amacıyla Taguchi Fraksiyonel Tasarım Yöntemi kullanılmıştır. Sıcaklık, liç süresi, katı-sıvı oranı, sülfürik asit konsantrasyonu ve karıştırma hızı parametreler olarak seçilmiştir. Karıştırma yapılmaksızın en uygun çözünme koşulları, 95 °C' lik bir sıcaklık, 150 dakikalık liç süresi, 20 g cevher/100 mL çözelti olan katı/sıvı oranı, % 65 (w/v) sülfürik asit konsantrasyonu olarak bulundu. Optimum özütleme koşulları altında yapılan deneysel sonuçlar, lateritik cevherden nikel ekstraksiyonunun yaklaşık % 90 olduğunu göstermiştir. Deney sonuçlarına varyans analizi (ANOVA) uygulanmıştır. Her faktörün nikelin çözünmesine katkıları yüzde olarak belirlenmiştir.
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The sorption characteristics of insolubilized humic acid (IHA) were investigated for Ni (II) in a column arrangement. The sodium form of the IHA (INaA) was used as a solid phase. Column operations were performed with five steps and all of... more
The sorption characteristics of insolubilized humic acid (IHA) were investigated for Ni (II) in a column arrangement. The sodium form of the IHA (INaA) was used as a solid phase. Column operations were performed with five steps and all of them were monitored continuously by a flowthrough cell-adapted UV-Vis spectrophotometer. Thus, all solid-phase extraction (SPE) steps were visualized by breakthrough curves and analyses progress were evaluated. However, all calculations and evaluations were focused on the atomic absorption spectrophotometric (AAS) analyses of the solutions collected during the stripping steps. There was a high correlation (r2r2, 0.972) between peak area and AAS data of stripping steps. The effect of concentration and pH of the loading solution onto sorption of Ni (II) by INaA was investigated. Sorption characteristics were evaluated by using Freundlich, Langmuir, and Dubinin–Radushkevich (D-R) adsorption isotherms, as well as by Scatchard plot analysis. Multilayer ...
Research Interests: Engineering, Water, Adsorption, Copper, Solid Phase Extraction, and 15 morePhysical sciences, Humic Substances, Humic acid, Nickel, Solubility, Free Energy, CHEMICAL SCIENCES, Time Factors, Surface Properties, Atomic Absorption, Ion Exchange, Sensitivity and Specificity, Stripping, Breakthrough Curve, and Adsorption isotherm
In the current nanotechnological perspective, fundamental materials such as ceramics, metals, polymers, composites, glass or wood and their specific characteristics can be combined at the molecular level for the synthesis and... more
In the current nanotechnological perspective, fundamental materials such as ceramics, metals, polymers, composites, glass or wood and their specific characteristics can be combined at the molecular level for the synthesis and implementation of new functional nanomaterials. Therefore, durability or acid-base resistance of the ceramic materials can be supported or modified with the properties of flexible organic polymeric structures to produce unusual hybrid nanomaterials. From this perspective, starting from the molecular precursors, atomic precision and integrated production techniques were successfully applied for the novel hybrid nanomaterials with distinctive features. Obtained new nanomaterials were utilized as functional surface coatings or in adsorption, filtration or other optical applications. In the same manner, scratch or corrosion prevention, UV protection, acid-base resistance, fluorescence character, superhydrophobic/self cleaning features, hardness and many other tailored properties were obtained in one distinctive material. Since developed products usually start with cheap, effective, long lasting and controllable precursors, our new material approach represents a highly attractive route for the synthesis and production of highly desirable novel hybrid structures for different applications.