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Browsing by Author "Kuyucu, Ali Ender"

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    Article
    Amino Acid-Based Hydrophobic Cryogels for Efficient Methylene Blue Removal: a Reusable and Eco-Friendly Approach To Dye-Contaminated Wastewater Treatment
    (Mdpi, 2025) Sofuoglu, Merve; Kuyucu, Ali Ender; Erol, Kadir; Gokmese, Faruk
    The release of synthetic dyes into the environment through industrial wastewater represents a significant environmental concern. In this study, a hydrophobic cryogel, Poly(2-hydroxyethyl methacrylate-N-methacryloyl-L-phenylalanine), was synthesized and employed for the efficient removal of methylene blue from aqueous solutions. The cryogel exhibited a surface area of 6.834 m2/g and a water retention capacity of 218.6%. Adsorption experiments conducted under various conditions revealed a high adsorption capacity of 1304.6 mg/g for MB. Thermodynamic analyses indicated that adsorption occurs spontaneously and follows a monolayer adsorption model. The adsorption capacity increased with temperature and ionic strength, confirming that hydrophobic forces predominantly drive the interaction. Reusability tests showed that the cryogel maintained its adsorption efficiency over five consecutive adsorption-desorption cycles, with a desorption efficiency of up to 98%. These findings demonstrate that Poly(HEMA-MAPA) cryogel is a practical, reusable, and eco-friendly adsorbent for removing methylene blue, a common textile dye pollutant, from water systems.
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    Master Thesis
    Characterization of Activated Carbon Obtained From Zivzik Pomegranate(Siirt) and Adsorption of Dye
    (2013) Kuyucu, Ali Ender; Selçuk, Ahmet
    Bu çalışmada; adsorban madde olarak Zivzik Narı'ndan elde edilen aktif karbon kullanılmıştır. Aktif karbon ZnCl2 ile kimyasal aktivasyonla hazırlanmıştır. BET yüzey alanı 1513.05 m2/g olarak ölçülmüştür. Boyarmadde olarak Methylene Blue ve Crystal Violet kullanılmıştır.Başlangıç boya derişiminin, başlangıç pH'ının ve sıcaklığın adsorpsiyon üzerindeki etkisi incelenmiştir. Her iki boyar madde için dört farklı başlangıç derişimi kullanılmıştır. Başlangıç pH'ının adsorpsiyon kapasitesini etkilemediği görülmüştür. Dört farklı adsorpsiyon izotermine uygunluk araştırılmış olup, Langmuir adsorpsiyon izotermine uyduğu tespit edilmiştir.Üç farklı sıcaklıkta, farklı başlangıç derişimleri ile deneysel çalışmalar yapılarak, kinetik hız modelleri incelenmiştir. Çalışmamızın Pseudo 2. Derece Kinetik modele daha uygun olduğu görülmüştür. Ayrıca termodinamik parametreler hesaplanarak adsorpsiyonun tersinir ve endotermik karakterli olduğu görülmüştür. Anahtar Kelimeler : Adsorpsiyon, Aktif Karbon, Boyarmadde, İzoterm, Kinetik
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    Effective Removal of Dyes From Aqueous Systems by Waste-Derived Carbon Adsorbent: Physicochemical Characterization and Adsorption Studies
    (Nature Portfolio, 2025) Kuyucu, Ali Ender; Selcuk, Ahmet; Onal, Yunus; Alacabey, Ihsan; Erol, Kadir
    Due to their cost-effectiveness and high surface area, activated carbons are commonly used for the adsorption of dyes from aqueous solutions. In this study, activated carbon was synthesized from walnut shell waste via KOH activation (1:3 ratio), yielding a surface area of 2347.4 m(2)/g. Reactive Blue 19 and Reactive Red 195 adsorption behavior were studied under varying experimental conditions. These included natural pH values (6.8-7.2), dye concentrations between 50 and 1250 mg L--(1), and adsorbent dosages ranging from 0.1 to 1.0 g. Adsorption equilibrium was achieved within 150 min. The maximum adsorption capacities were found to be 1227.17 mg g(-)(1) for RB 19 and 235.74 mg g(-)(1) for RR 195. Isotherm modeling was conducted using Langmuir, Freundlich, Temkin, and Dubinin-Radushkevich models, with Freundlich providing the best fit for both dyes, indicating multilayer adsorption on heterogeneous surfaces. Thermodynamic analysis revealed that the adsorption processes were spontaneous and endothermic, with negative Gibbs free energy (Delta G degrees), positive enthalpy (Delta H degrees), and positive entropy (Delta S degrees) values. These results highlight the high adsorption performance and practical potential of walnut shell-derived activated carbon for dye removal from wastewater.
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    Article
    Investigation of Isothermal Parameters of Dye Adsorption Onto Active Carbon
    (Health & Environment Assoc, 2015) Selcuk, Ahmet; Kuyucu, Ali Ender; Kul, Ali Riza; Onal, Gulen
    The fact that active carbon adsorps colourants and heavy metals has been known for a long time and thus it is used as adsorbant in removal of such pollutants. In this study, the capacity of active carbon in removal of colourant was investigated. As active carbon, Zivzik pomegranate from Siirt district of TURKEY was used and removal of colourants of Methylene Blue and Crystal Violet was studied. Active carbon was prepared with ZnCl2 by chemical activation. BET surface area, total surface volume and surface area of active carbon were measured by hte istrument called BET. In our study, adsorptions Methylene Blue and Crystal Violet colourants to active carbon at 45 degrees C were evaluated for four different initial colourant concentrations of 200, 400, 600 and 800 mg/L graphically.
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    Doctoral Thesis
    Production. Applications and Characterization of Activated Carbon From Walnut and Antep Peanut Shells by Chemical and Physical Activation Methods
    (2022) Kuyucu, Ali Ender; Selçuk, Ahmet; Önal, Yunus
    Bu doktora çalışmasında, kimyasal aktivasyon yöntemiyle iki farklı atık biyokütleden aktif karbon sentezlenmiş ve bu aktif karbonların boyar madde adsorpsiyonu incelenmiştir. Çalışmamızda kullanılan biyokütleler, ceviz dış(yeşil) kabuğu ve Antep fıstığı dış(pembe) kabuğu olarak seçilmiş, hiçbir ön işleme tabii tutulmadan deneylerde kullanılmıştır. Biyokütlelerin 500°C'de, 1 saat, 10°C/min ısıtma ve 100 ml/dk'da N2 gaz akışı şartlarında karbonizasyon işlemleri yapılmış, ardından her bir biyokütle numunesi KOH ile 1:1,1:2 ve 1:3 emdirme oranlarında 800°C, 1 saat ve 10°C/min N2 gazı altında, ZnCl2 ile 1:1 emdirme oranında öğütülmüş ve öğütülmemiş olmak üzere ikişer numune elde edilecek şekilde muamele edilmiş olup, 500°C, 1 saat ve 10°C/min N2 gazı altında kimyasal aktivasyonları gerçekleştirilmiştir. Üretilen aktif karbonlardan en yüksek yüzey alanına sahip CDK6 kodlu numune seçilerek. RR 195 ve RB 19 boyarmaddeleri için başlangıçtaki boya derişimi ve sıcaklığın adsorpsiyon üzerindeki etkileri araştırılmıştır. Adsorpsiyon prosesinin kinetik ve izoterm modellemesi kapsamında; 4 (dört)'er adet kinetik ve izoterm modellemesi incelenmiş olup. RR195 ve RB19 boyarmaddeleri için adsorpsiyon mekanizmasının Yalancı İkinci Mertebeden kinetik modele ve Freundlich adsorpsiyon izotermine uygunluğu tespit edilmiştir.