Browsing by Author "DENİZ, SABAHATTİN"
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Publication Metadata only Adsorption-based removal of pigment from printing industry wastewater using environmentally friendly inorganic micro particles(2023-10-06) DENİZ, SABAHATTİN; AYDIN URUCU, OYA; DENİZ S., AYDIN URUCU O.Publication Metadata only Ağır metal analizlerinde spektroskopik yöntemler(Gece Kitaplığı, 2022-01-01) DENİZ, SABAHATTİN; DENİZ S.Publication Metadata only Degradation of Reactive Dyes Using Advanced Oxidation Method(WILEY, 2015) KÖK YETİMOĞLU, ECE; Ercan, Ozgen; Deniz, Sabahattin; Yetimoglu, Ece Kok; Aydin, AdnanIn this study, the photo-Fenton process was used to identify degradation conditions of Reactive Blue 19 (RB19) and Reactive Red 21 (RR21). The effects of pH, initial H2O2 and FeSO4 concentrations, time, and UV light intensity in determining the degradation rate were studied. The optimal conditions for the degradation of 0.156 mmol L-1 RB19 and 0.036 mmol L-1 RR21 in water were found to be: pH 4, 0.1 mL 30% H2O2 for RB19 and RR21, 0.2 mL 0.5% FeSO4 for RB19 and 0.1 mL 0.5% FeSO4 for RR21, 20 mL volume, and a temperature of 20 degrees C. Optimal conditions were applied to synthetic dye wastewater using small amounts of H2O2 in 1 L for degradation. The degree of degradation efficiency of synthetic wastewater by the photo-Fenton process was found to be > 95% within 10 min.Publication Open Access Efficient and environmentally friendly removal of azo textile dye using a low-cost adsorbent: Kinetic and reuse studies with application to textile effluent(2023-06-01) DENİZ, SABAHATTİN; DENİZ S.Recently, there has been an increasing interest in environmentally friendly methods for the removal of toxic dyes to enable sustainable textile dyeing processes. In this study, a highly efficient, non-toxic, low-cost MgO particles were prepared by sol-gel technique and utilized for the removal of Reactive Red 21 azo dye by adsorption process. The prepared MgO particles were characterized by Scanning Electron Microscopy, Fourier Transform Infrared Spectroscopy, X-Ray Diffraction, and Particle Size Analysis. The batch adsorption studies were performed for optimizing the parameters affecting adsorption. The adsorption behavior of Reactive Red 21 was accurately characterized by the Langmuir model. The adsorption process was found to be thermodynamically spontaneous at room temperatures as indicated by the negative Gibbs free energy change (∆G) value of −30.65 kj/mol. The kinetic studies indicate that the pseudo-second-order model provides a good fit to the adsorption of Reactive Red 21. The adsorption capacity of the prepared MgO particles for Reactive Red 21 was determined to be 355 mg/g at room temperature over a wide pH range of 5–9, with a contact time of 20 min. The regeneration of dye-adsorbed MgO particles was conducted at 500 °C for 2 h. The regenerated MgO particles were then utilized for adsorbing Reactive Red 21 five times with a sufficiently high dye removal efficiency. The prepared MgO particles provided a 98 % dye removal in real textile wastewater containing Reactive Red 21 dye.Publication Metadata only Microplastics and recent identification techniques(Gece Publishing, 2022-01-01) DENİZ, SABAHATTİN; DENİZ S.Publication Metadata only Removal of Lead and Cadmium Ions from Aqueous Solutions Using Sulphur and Oxygen Donor Ligand Bearing Hydrogels(TAYLOR & FRANCIS INC, 2010) KÖK YETİMOĞLU, ECE; Firlak, Melike; Yetimoglu, Ece Koek; Kahraman, Memet Vezir; Apohan, Nilhan Kayaman; Deniz, SabahattinA new thiourea and urea functional monomers were synthesized. A series of hydrogels were prepared by photopolymerization. The hydrogels were used for the removal of Pb(II) and Cd(II) ions from aqueous solutions. The influence of the uptake conditions such as the pH, the time, and the initial feed concentration on the metal ion binding capacity of hydrogel was tested. The selectivity of the hydrogels towards the different metal ions was also tested. The adsorption isotherm models were applied. The limits of detection and quantification were calculated. The usability of the hydrogels for preconcentration studies were also investigated.Publication Metadata only Removal of Pb2+ and Cd2+ ions from aqueous solutions using guanidine modified hydrogels(WILEY-BLACKWELL, 2011) KÖK YETİMOĞLU, ECE; Yetimoglu, Ece Kok; Firlak, Melike; Kahraman, Memet Vezir; Deniz, SabahattinIn this study, experimental measurements have been made on the batch adsorption of cadmium and lead ions from aqueous solutions using poly(guanidine modified 2-acrylamido-2-methylpropan sulfonic acid/acrylic acid/N-vinylpyrrolidone/2-Hydroxyethyl methacrylate), P(AMPSG/AAc/NVP/HEMA) hydrogels. The guanidyl end group bearing AMPSG monomer was synthesized from the reaction of AMPS and guanidine. The hydrogels were prepared by UV-curing technique. The morphology of the dry H10-hydrogel sample was examined by SEM. The influence of the uptake conditions, such as pH, functional monomer per cent, contact time, initial feed concentration, and foreign metal ions on the metal ion binding capacity of hydrogel, was also tested. The selectivity of the hydrogel toward the different metal ions tested was Hg(II) > Pb(II) > Au(III) > Cd(II). The adsorption isotherm models were applied to the experimental data, and it was seen that the Langmuir isotherm model was the best fit for the adsorption of Cd(II) and Pb(II) ions on P(AMPSG/AAc/NVP/HEMA) hydrogel. It was found that adsorbed lead and cadmium ions on P(AMPSG/AAc/NVP/HEMA) hydrogel can be effectively desorbed by acid leaching and the regenerated P(AMPSG/AAc/NVP/HEMA) hydrogel can be reused almost five times less without any loss of adsorption capacity. Copyright (C) 2009 John Wiley & Sons, Ltd.Publication Open Access Sistein İçeren Yeni Bir Adsorban Sentezi ve Sulu Ortamdan Pb(II) ve Hg(II) İyonlarının Giderimi(2018-09-30) DARTAN, GÜLER; SABAHATTİN DENİZ;GÜLER DARTAN;Yalçın Kaan TÜRKMENOĞLUSulu ortamlardaki ağır metal kirliliği canlı hayatı için çok önemli sorunlara neden olabilmektedir. Pek çok organik kirleticilere göre sulu ortamda daha kararlı bir yapıda bulunabilmeleri ve biyolojik ortamlarda birikebilmeleri çevre sağlığı açısından geri dönülemez zararlara neden olabilmektedir. Gelişen ve artan sanayii üretimi atık olarak pek çok ağır metal oluşturmakta ve bunların kontrolsüz deşarjı temiz su kaynaklarının azalmasına neden olmaktadır. Bu sebeple sulu ortamdan ağır metal giderimi tüm canlılar için oldukça önemli bir konudur. Bu çalışmada 3-aminopropilsilika sistein ile modifiye edilerek yeni bir adsorban sentezlendi ve karakterize edildi. Ardından sentezlenen bu adsorbanın Pb(II) ve Hg(II) iyonları için adsorpsiyon kapasitesi incelendi. Maksimum adsorpsiyon için en uygun şartlar (temas süresi, pH) belirlendi. Sentezlenen adsorbanın Pb(II) ve Hg(II) iyonları için pH=6’ da 60 dakikada maksimum adsorpsiyon kapasitesi sırasıyla 12,32 ± 0,2 ve 100,6 ± 0,2 mg g-1 olarak belirlendi.Publication Metadata only Structural and Luminescence Properties of Sm3+ Doped TTB -Type BaTa2O6 Ceramic Phosphors(SPRINGER/PLENUM PUBLISHERS, 2015) BAŞAK, ALİ SADİ; Ekmekci, Mete Kaan; Ilhan, Mustafa; Basak, Ali Sadi; Deniz, SabahattinPure and 0.5 to 10 mole% Sm3+ doped TTB (tetragonal tungsten bronze)-type BaTa2O6 ceramic phosphor was produced by the solid state reaction method which performed at 1425 A degrees C for 20 h. XRD and SEM analysis indicated single TTB phase for undoped and 0.5 to 10 mole% Sm3+ doped BaTa2O6 structures. SEM also showed that the BaTa2O6 grain size decreased with the increasing content of Sm3+. Optical analysis indicated significant emissions in the visible spectral region as green (lambda = 562.7 nm) and orange-reddish (lambda = 597.1 nm). The emission intensity increased with the increasing doping concentration up to 2.5 mole%, and then decreased due to the concentration quenching effect.