Browsing by Author "Canli M."

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    Natural zeolite activated with hydrogen peroxide for removal of methylene blue
    (2012) Canli M.; Abali Y.; Bayca S.U.
    A Turkish natural zeolite was collected, characterized, and then activated by hydrogen peroxide. It was employed for basic dye adsorption in aqueous solution. The natural zeolite is mainly composed of clinoptilolite, quartz and mordenite. The natural zeolite showed maximal adsorption capacity of 19.17 mg/g before and 31 mg/g after hydrogen peroxide activation for methylene blue. Kinetic studies indicated that the adsorption followed the pseudo second-order kinetics and could be described as two-stage diffusion process. The experimental data fitted very well the pseudo-second-order kinetic model and also followed the intra-particle diffusion model up to 30 min, whereas diffusion is not only the rate controlling step. The activation energy of system (Ea) was calculated as 1.87 kJ mol-1.Thermodynamic calculations showed that the adsorption is endothermic process with ΔH0 at 5.24kJ/mol for methylene blue. The results indicate that activation with hydrogen peroxide increases the adsorption capacity of zeolite for the removal of textile dyes from effluents. © Sila Science.
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    Removal of methylene blue by natural and ca and k-exchanged zeolite treated with hydrogen peroxide
    (2013) Canli M.; Abali Y.; Bayca S.U.
    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 H2O2 showed higher adsorption capacity than untreated zeolite samples. The Langmuir model (R2 values between 0.959 and 0.996) fitted the experimental data better than the Freundlich model (R2 values between 0.804 and 0.988). The adsorption process was found to be slightly influenced by adsorbent dosage, contact time and temperature. Optimum pH for adsorption of MB was found to be at 7. Adsorption equilibrium attained within 30 minutes. The sorption of MB increased slightly with rising temperature. In addition, adsorption values rose with modification Ca- Exchanged (after H2 treatment) > K-Exchanged (after 2 treatment) > Zeolite treated with H2O2 > Ca-Exchanged >K-Exchanged >Natural Zeolite.
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    Thermal and mechanical properties of LDPE by the effects of organic peroxides
    (John Wiley and Sons Ltd, 2017) Sirin K.; Cengel Ö.; Canli M.
    In this study, the effect of different organic peroxides on different types of low-density polyethylene (LDPE) was investigated. LDPE products like F2-21T, F5-21T, and I22-19T were mixed in different proportions with dialkyl peroxide, dibenzoyl peroxide, and dilauroyl peroxide. Melt flow rates, mechanical properties (tensile strength at yield, tensile strength at break, elongation at break, and stress-strain effect), thermal analysis (differential scanning calorimetric and thermogravimetric analysis), and scanning electron microscopy images of the prepared mixtures were examined. Cross-linking occurred in the structure of LDPE types having different molecular weight distribution by the addition of even small amounts of peroxide (e.g. 0–0.12 wt%). Copyright © 2017 John Wiley & Sons, Ltd. Copyright © 2017 John Wiley & Sons, Ltd.