Sürdürülebilir Kalkınma Amaçları

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• MakaleYalnız künye2020Scopus SJRQ1/r/munzur/3497
  A thermodynamic and kinetic approach to adsorption of methyl orange from aqueous solution using a low cost activated carbon prepared from Vitis vinifera L.

  Yönten, Vahap; Sanyürek, Nesrin Karaca; Kivanç, Mehmet Rıza

  In this paper, thermodynamic and kinetic parameters of the Methyl Orange adsorption process on active carbon prepared from endemic Vitis vinifera L. grape seeds (AC-VVL) grown in the Tunceli-Elazığ region and % removal of dye from aqueous solutions were evaluated by using a batch system. Experiments were performed as a function of pH (2, 5, 8 and 11), temperature (15 °C, 30 °C and 45 °C) and initial concentration (100, 150, 300 and 1000 mg L−1). The mechanism and characterization of adsorption of dye was analyzed pre-adsorption (AC-VVL) and post-adsorption (AC-VVL+dye) using FTIR (Fourier Transform Infrared Spectroscopy), SEM (Scanning Electron Microscope) and Brauner Emmet and Teller (BET) analyzer. The activation energy (Ea) was determined as 24.80, 39.15, −22.40 and 61.73 kJ/mol for 100, 150, 300 and 1000 mg L−1, respectively. The Langmuir, Freundlich, Temkin and Harkins Jura isotherms were used to describe the adsorption equilibrium studies at different temperatures. The Freundlich isotherm shows better fit than other isotherms in the temperature range studied. Maximum adsorption occurred at pH 2 and was approximately 79.7 mg/g. The % Recycling Yield was found to be 20% and 9 mg/g with acetone. Thermodynamic parameters like the change in enthalpy (ΔH o), entropy (ΔS o) and Gibbs free energy (ΔG o) were evaluated and the adsorption process was found to be endothermic and spontaneous. The results show that this AC-VVL biomass is an appropriate biosorbent and has specific affinity for removal of Methyl Orange from aqueous solutions.

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  AtıfScopus109·WoS103·OpenAlex111

  İncele
• DüzeltmeYalnız künye2017Scopus SJRQ1/r/munzur/4709
  A food waste utilization study for removing lead(II) from drinks (vol 214, pg 637, 2017)

  Ince, Olcay Kaplan; Ince, Muharrem; Yonten, Vahap; Goksu, Ali

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• MakaleAçık Erişim2017Scopus SJRQ2/r/munzur/4297
  Exploring thermodynamics and kinetic parameters of immobilized catalase enzyme via adsorption on krill clay

  Nas, Mehmet Salih; Gür, Aycan; Gür, Tugba; Yönten, Vahap

  The thermodynamic parameters and immobilization kinetics of catalase enzyme via adsorption onto krill clay were performed in aqueous solution in batch system. The adsorbent was characterized by X-ray fluorescence, scanning electron microscope and Brunauer-Emmett-Teller N-2 adsorption measurements. The effect of some parameters to the adsorption process such as contact time, stirring speed, initial enzyme concentration, initial ionic strength, temperature and pH were analyzed. Maximum adsorption capacity (q(m)) showed a great dependence on pH and initial enzyme concentration. It was found at pH 5.5, and initial enzyme concentration, 0.0075 g L-1 values. Pseudo-first-order, pseudo-second-order and intraparticle diffusion were used to fit the kinetics data on kinetic models. Furthermore, thermodynamic activation parameters such as enthalpy, entropy, Gibbs free energy and activation energy (Delta H degrees, Delta S degrees, Delta G degrees and E-a) which reveal that catalase enzyme adsorption occur spontaneously and in endothermic nature were determined. The obtained results confirmed that the applicability of krill clay is an efficient immobilizing supporter for catalase enzyme and krill clay material can be used as a very effective adsorbent in immobilization of this enzyme from aqueous solutions.

  AtıfWoS9·OpenAlex13

  İncele
• MakaleYalnız künye2017Scopus SJRQ1/r/munzur/4743
  A food waste utilization study for removing lead(II) from drinks

  Ince, Olcay Kaplan; Ince, Muharrem; Yonten, Vahap; Goksu, Ali

  This is the first study about removal of lead (Pb(II)) from energy drinks. In this paper, food waste, namely eggshell (hydroxyapatite) utilization, was used to remove Pb(II) from mineral water and energy drinks. Mineral water and energy drinks were chosen for removal of lead since the latter is severely hazardous to human health even in small amounts. Response Surface Methodology (RSM) was performed to optimize the application process by practice of the quadratic model united with the Central Composite Design (CCD) and quadratic combined program was utilized to study the most effective parameters on aforementioned liquids. Through the application of variance analysis (ANOVA) factors critical to removing of lead were identified for each experimental design response. Maximum adsorption capacity of eggshell was achieved as 923 mg g(-1) for Pb(II). The obtained optimum conditions were applied to drinks. Results showed that used adsorbent was quite effective in removing Pb(II) from drinks. (C) 2016 Elsevier Ltd. All rights reserved.

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  AtıfWoS27·OpenAlex28

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• MakaleYalnız künye2017/r/munzur/5359
  Ucuz ve Çevre Dostu Bir Adsorbent Olan Üzüm Çekirdeği ile Metilen Mavisinin Sulu Çözeltilerden Gideriminde RSM Kullanımı

  Sanyürek, Nesrin Karaca; Yönten, Vahap

  Ucuz ve atık olarak değerlendirilen üzüm çekirdeği insanların gıda olarak kullandığı üzümden elde edilen ve bol miktarda bulunan bir atıktır. Bu atık aktif karbon haline getirilerek bir boyar madde olan Metilen Mavisinin (MM) sentetik atık sulardaki gideriminde kullanılmıştır. Optimizasyon süreci Response Surface Metodology (RSM) kullanılarak tamamlanmıştır. Çalışılan süreçte giderimi etkileyecek dört farklı parametre seçilmiş ve bu parametreler optimize edilerek maksimum Metilen mavisi giderimi bulunmuştur. Bu parametrelerin herbirinin (pH, zaman (dakika), adsorbent miktarı (g) ve başlangıç derişimi mgL-1) cevap üzerindeki etkileri Central Compozite Design (CCD) programı kullanılarak hesaplanmıştır. Yapılan deneysel çalışmalar sonucunda quadratik bir model bulunmuş ve üç boyutlu grafikler elde edilerek Anova istatiksel verileri hesaplanmıştır. Gerçekleştirilen deneysel ve istatiksel çalışmalar sonucunda bağımsız parametrelerin maksimum değerleri pH 3.7, süre 55.5 dakika, adsorbent miktarı 1.4 gram ve başlangıç derişimi 160 mgL-1 olarak bulunmuştur. Bu veriler kullanılarak aktif karbon (Vitis vinifera L.) ile sentetik atık sulardan yaklaşık %99 verimle Metilen mavisi giderimi sağlanmıştır. Aynı zamanda bulunan modelin yapılan çalışmayı %82 desteklediği gözlenmiştir.

  İncele
• MakaleYalnız künye2017Scopus SJRQ1/r/munzur/3867
  Investigation of optimum conditions for efficient COD reduction in synthetic sulfamethazine solutions by Pleurotus eryngii var. ferulae using response surface methodology

  Yonten, Vahap; Alp, Hevidar; Yildirim, Numan; Yildirim, Nuran Cikcikoglu; Ogedey, Aysenur

  This study aims to explore the optimum conditions for P. eryngii var. ferulae in adsorption of sulfamethazine (SM) from synthetic solutions via reduction of chemical oxygen demand (COD). The optimum conditions were optimized using the response surface methodology (RSM) developed by the application of the quadratic model associated with the central composite design. For this aim, RSM was employed to determine the effects of some parameters on this adsorption process by fungal biomass as an effective and available adsorbent. The investigated parameters were initial concentration of sulfamethazine (70–235 mg L−1), solution pH (3–7), adsorbent dosage (0.3–1.5 g), and contact time (5–25 min). The significant factors on each experimental design response were identified from the analysis of variance. The results of RSM analyzes revealed that optimum conditions of initial SM concentration, pH, adsorbent dosage, and contact time for maximum COD removal (82%) were achieved as 400 mg L−1, 11, 1.46 g, and 15.4 min, respectively. The results showed that dead biomass of P. eryngii var. ferulae were an appropriate adsorbent for the removal of COD in the SM medium from synthetic solutions.

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  AtıfScopus13·WoS12·OpenAlex15

  İncele
• MakaleAçık Erişim2016Scopus SJRQ2/r/munzur/4772
  Optimization of Remazol Brilliant Blue R dye removal by novel biosorbent P. eryngii immobilized on Amberlite XAD-4 using response surface methodology

  Yonten, Vahap; Tanyol, Mehtap; Yildirim, Numan; Yildirim, Nuran Cikcikoglu; Ince, Muharrem

  This study investigates preparation of biosorbent Pleurotus eryngii immobilized on Amberlite XAD-4 and the optimal conditions for removal of Remazol Brilliant Blue R (RBBR) reactive dye from synthetic aqueous solutions. The process was optimized using the response surface methodology (RSM) developed by the application of the quadratic model associated with the central composite design. For this purpose, RSM was employed to determine the effects of operational parameters on this material as effective and available adsorbent. The investigated variables were dye initial concentration (10-60 mg L-1), solution pH (2-9), adsorbent dosage (0.1-0.5 g), and temperature (20-45 degrees C). The significant factors on each experimental design response were identified from the analysis of variance (ANOVA). The RSM indicated that optimum conditions of initial dye concentration, pH, adsorbent dosage, and temperature for maximum RBBR removal (98%) were achieved as 36.3 mg L-1, 2.0, 0.304 g, and 38.7 degrees C, respectively. The results showed that this biosorbent was an appropriate adsorbent for the removal of RBBR from aqueous solutions.

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  AtıfWoS17·OpenAlex20

  İncele
• MakaleAçık Erişim2016Scopus SJRQ2/r/munzur/4739
  Nickel, Lead, and Cadmium Removal Using a Low-Cost Adsorbent - Banana Peel

  Ince, Muharrem; Ince, Olcay Kaplan; Yonten, Vahap; Karaaslan, Nagihan M.

  Water pollution because of inorganic contaminants is a serious problem due to the acute toxicities and carcinogenic nature of pollutants. Recently, much attention has been focused on using natural and low-cost adsorbents, especially food residues, for removing toxic metal ions. Batch removal of nickel (Ni(II)), lead (Pb(II)), and cadmium (Cd(II)) from aqueous solution using a natural adsorbent is described in this study. Effects of various parameters on adsorption capacities such as pH, adsorbent dose, and stirring time were investigated by batch experiments. The maximum adsorption capacities for Ni(II), Pb(II), and Cd(II) ions were 1.6 mg g(-1), 125 mg g(-1), and 84 mg g(-1), respectively. Characterization of the surface modification was performed with FTIR measurements. FTIR spectra showed that chemisorption takes place at the surface of the adsorbent. The Freundlich and Langmuir adsorption isotherms were used to evaluate the equilibrium data. The characteristic parameters for each isotherm were determined. The Langmuir and Freundlich isotherm provided the best correlation for Ni(II), Cd(II), and Pb(II) using banana peel.

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  AtıfWoS10·OpenAlex13

  İncele
• MakaleYalnız künye2016Scopus SJRQ3/r/munzur/4749
  Optimization of Cadmium Removal from Water by Hydroxyapatite Using Experimental Design Methodology

  Ince, Olcay Kaplan; Ince, Muharrem; Karaaslan, Nagihan M.; Yonten, Vahap

  The presence of cadmium in water is a serious threat to the environment. The removal of cadmium using hydroxyapatite as an adsorbent was studied in an aqueous system. Hydroxyapatite was prepared to process the adsorption of cadmium from aqueous solution. Experimental design methodology and response surface methodology (RSM) with a quadratic model associated with central composite design was used to optimize the pH, initial heavy metal concentration, final volume, and adsorbent dosage for the removal of cadmium. Analysis of variance identified significant factors on each parameter. RSM indicated that a pH of 8.5, a sample volume of 166 mL, an adsorbent of dosage 0.57 g, and a contact time of 82 min were optimal for the adsorption of Cd(II). Under these conditions, the removal of Cd(II) was 895 mg g(-1).

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  AtıfWoS17·OpenAlex15

  İncele
• MakaleAçık Erişim2016Scopus SJRQ2/r/munzur/4716
  Adsorption of bisphenol A from aqueous solutions by Pleurotus eryngii immobilized on Amberlite XAD-4 using as a new adsorbent

  Yonten, Vahap; Ince, Muharrem; Tanyol, Mehtap; Yildirim, Numan

  The adsorption of bisphenol A (BPA) in a fixed-bed column was evaluated in this work. Fungus Pleurotus eryngii isolated from Tunceli (Turkey) immobilized on XAD-4 resin was used as an adsorbent for decontamination of BPA from aqueous solutions. The extent of BPA removal capacity was evaluated as a function of parameters such as pH, volume of the sample, and column bed height. Adsorption isotherms of BPA on immobilized P. eryngii were determined and correlated with common isotherm equations such as Langmuir and Freundlich models. The mechanism of adsorption of BPA was analyzed preadsorption (XAD-4+fungus) and postadsorption (XAD-4+fungus+BPA) using fourier transform infrared spectroscopy. The results show that adsorption ability of BPA by immobilized P. eryngii is possible and this system yields the best degree of BPA removal (90%) at pH 11 for an initial load of 120mgL(-1). Therefore, this material can be used as a very effective adsorbent for BPA decontamination in aqueous solutions.

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  AtıfWoS17·OpenAlex21

  İncele