Sürdürülebilir Kalkınma Amaçları

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• MakaleYalnız künye2021Scopus SJRQ1/r/munzur/2681
  Silane doped biodegradable starch-PLA bilayer films for food packaging applications: Mechanical, thermal, barrier and biodegradability properties

  Gürler, Nedim; Paşa, Salih; Temel, Hamdi

  In this work, pure potato starch (PPS) purified from waste potato starch, was recovered and used. PPS was modified by 3-APTMS (3-(aminopropyl) trimethoxy silane) to manufacture a crosslinked film. To obtain a bilayer PPS-3APTMS-PLA film, the polylactic acid (PLA) was employed with PPS-3APTMS by casting method. The resulting materials, PPS-3APTMS and PPS-3APTMS-PLA were characterized by attenuated total reflectance fourier transform ınfrared (ATR-FTIR), x-ray Diffraction (XRD), scanning electron microscopy (SEM), differential scanning calorimetry (DSC), thermogravimetric analysis (TGA). The silane-doped bilayer films have more thermal stability compared to PPS. The mechanical, solubility, swelling, water vapor permeability, optical properties and biodegradability under controlled compost conditions were examined. When the tensile strength of the PPS, PPS-3APTMS and PPS-3APTMS-PLA films were evaluated, the tensile strength (TS) were to 1.017±0.35 MPa, 1.437 ± 0.19 MPa and 10.918 ± 1.30 MPa, respectively. The PPS and PPS-3APTMS films were not elongation at break, while it was found about 21.94 ± 9.48 for the bilayer PPS-3APTMS-PLA film. The solubility, swelling, water vapor permeability, and transparency decreased for bilayer films. The water vapor permeability of PPS, PPS-3APTMS and PPS-3APTMS-PLA films were obtained as 31.69±0.4 × 10−7 g s−1 m−1 Pa−1, 28.96±0.4 × 10−7 g s−1 m−1 Pa−1, and 14.26±0.3 × 10−7 g s−1 m−1 Pa−1, respectively. Then, the biodegradability of films was performed under controlled compost conditions for 46 days according to ISO-14,855 standard. The biodegradation of PPS, PPS-3APTMS and PPS-3APTMS-PLA was also calculated as 9.30%, 5.45% and 5.08%. Biodegradation of PPS-3APTMS film decreases compared to PPS. Furthermore, the biodegradation value of bilayer film, PPS-3APTMS-PLA, was also decreased due to the slower degradation tendency of PLA. The contribution to the reusability of waste starch and the modifying of starch for food packaging and coating applications are the novelty aspects of the current study.

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  AtıfScopus93·WoS77·OpenAlex90

  İncele
• MakaleAçık Erişim2017Scopus SJRQ1/r/munzur/3900
  Application of response surface methodology for optimization of Remazol Brilliant Blue R removal onto a novel polymeric adsorbent

  Torgut, Gulben; Tanyol, Mehtap; Biryan, Fatih; Pihtili, Guzin; Demirelli, Kadir

  The poly[2-hydroxy-3-(1-naphthyloxy)propyl] methacrylate [poly(NOPMA)] was used as a novel adsorbent for the removal of Remazol Brilliant Blue R (RBBR) known as a reactive dye. Physico-chemical properties of polymer were analyzed by FT-IR and SEM before and after dye adsorption. The Langmuir and Freundlich isotherms were used to explain the adsorption equilibrium, and when it was compared with each other it was seen that the adsorption process was well explained by the Langmuir isotherm model and showing a monolayer adsorption capacity for RBBR of 238.10 mg/g. Kinetic models known as pseudo-first-order, pseudo-second-order and intra-particle diffusion model were utilized to analyze the mechanism of adsorption, and results indicated that was an adsorption kinetic suitable with the pseudo-second-order. The thermodynamic parameters (∆Ho, ∆So, ∆Go) indicated that the adsorption process was spontaneous and endothermic. To optimize the study conditions, the effects of the concentration of RBBR, adsorbent amount and contact time on the adsorption were investigated by response surface methodology (RSM). According to RSM results, maximum RBBR removal was reached at the optimum initial dye concentration of 60.85 mg/L, adsorbent dosage of 0.04 g/50 mL and contact time of 59.91 min.

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  AtıfScopus40·WoS37·OpenAlex43

  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 SJRQ1/r/munzur/4093
  Hardness removal from waters by using citric acid modified pine cone

  Altundogan, Hamdi Soner; Topdemir, Aykut; Çakmak, Meltem; Bahar, Nurdan

  In this study, an effective cation exchanger was developed from the pine cone by citric acid modification and its hardness removal properties from the waters were investigated. For this purpose, ground pine cone samples were subjected to a citric acid modification following NaOH saponification. Both of the raw (RPC) and modified pine cone (MPC) samples were subjected to standardized hardness removal tests by shaking with hard waters. These tests showed that citric acid modification significantly increases the cation exchange capacity of the pine cone. Most suitable size fraction of pine cone was determined as -16 + 30 mesh (600 mu m < x < 1200 mu m). Also, citric acid modified product obtained from this fraction was used in a continuous system to remove hardness from water. The results of this study showed that the MPC can be used for hardness removal from waters as a cheap, durable and environment -friendly material. Finally, regeneration experiments showed that the MPC can be used for hardness removal from water repeatedly by a simple HCl regeneration. (C) 2015 Taiwan Institute of Chemical Engineers. Published by Elsevier B.V. All rights reserved.

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  AtıfWoS28·OpenAlex34

  İncele