Sürdürülebilir Kalkınma Amaçları

• 4
• 4
• 3

• MakaleYalnız künye2022/r/munzur/6565
  Cevap Yüzey Metodolojisi Kullanılarak P(NIPAM-co-AN)/Kil Kompozit Üzerine İndigo Karmin Adsorpsiyonunun Modellenmesi ve Optimizasyonu

  Tanyol, Mehtap; Pıhtılı, Güzin

  Bu çalışmada yeni bir polimerik adsorban olan Poli(NIPAM-co-AN)/kil kompoziti yerinde polimerizasyon ile hazırlanmıştır. N-izopropilakrilamid, akrilonitril ve uygun miktarda alınan kilin (yaklaşık %5 w/w) kopolimerizasyonu, 10 mL 1,4-dioksan varlığında 65°C'de, AIBN (azobisizobütironitril) başlatıcısı varlığında gerçekleştirildi. NIPAM-AN/kil kompoziti IC (indigo karmin) boyasını sentetik atık sulardan uzaklaştırmak için yeni bir adsorban olarak kullanılmıştır. Üç önemli proses parametresi olan başlangıç indigo karmin konsantrasyonu (5-30 mg/L), adsorban dozu (10-80 mg) ve temas süresi (10-180 dakika) yanıt yüzeyi metodolojisi (RSM) ile birleştirilmiş. Merkezi Kompozit Tasarım (CCD) kullanılarak modelleme yapıldı ve en iyi indigo karmin giderme yanıtını elde etmek için optimize edildi. Çözeltideki indigo karmin miktarı, 650 nm dalga boyunda bir UV-görünür spektrofotometre kullanılarak ölçülmüştür. ANOVA (varyans analizi) istatistiksel değerine dayalı olarak, indigo karminin P(NIPAM-co-AN)/kil kompoziti üzerine adsorpsiyonu, çok düşük olasılık değeriyle (p

  • 
  AtıfOpenAlex4·TR Dizin1

  İncele
• MakaleAçık Erişim2022/r/munzur/5822
  Hidrojel Esaslı Kompozit Kullanılarak Naftol Yeşili B içeren Atıksuların Arıtımında Ortam Parametrelerinin Etkisi

  Tanyol, Mehtap; Pıhtılı, Güzin

  Bu çalışmada, EuCl3 ile katkılanmış poli (4-vinilpridin-ko-akrilamid) {P(4-VP-ko-AAm)/EuCl3} hidrojel kompozit adsorbent olarak kullanılarak atıksulardan naftol yeşili B boyasının giderim verimliliği araştırılmıştır. Naftol yeşili B adsorpsiyon verimliliğinin pH, adsorbent madde miktarı, başlangıç naftol yeşili B boya konsantrasyonu, sıcaklık ve temas süresi gibi değişkenlere bağımlılığı kesikli sistemde incelenmiştir. En yüksek giderim verimi 30 mg/L başlangıç naftol yeşili B konsantrasyonu, 0,05 g/100 mL P(4-VP-ko-AAm)/EuCl3 dozajı, pH=5,42 ve 25 °C sıcaklıkta %98,40 olarak elde edilmiştir. Deneysel denge verileri Langmuir izoterm modeli ile daha iyi uyum sağlamıştır. Kinetik sonuçlar, adsorpsiyon prosesinin hız belirleme basamaklarından biri olarak iç difüzyon ile yalancı ikinci derece kinetiği ile tanımlanabileceğini göstermiştir. Elde edilen deneysel sonuçlar, adsorbent olarak P(4-VP-ko-AAm)/EuCl3 hidrojeli kullanılarak naftol yeşili B boyasının başarılı bir şekilde atıksulardan giderilebileceğini göstermiştir.

  • 
  • 
  İncele
• MakaleAçık Erişim2022Scopus SJRQ2/r/munzur/2865
  Synthesis, characterization, and evaluation of antimicrobial performance of N-[3-(dimethylamino)propyl]methacrylamide based copolymer on pathogens

  Pıhtılı, Güzin; Erecevit Sönmez, Pınar; Biryan, Fatih; Torğut, Gülben

  In this study, poly{N-[3-(dimethylamino) propylmethacrylamide-co-acrylonitrile}; [P(DMAPMA-co-AcN)] copolymer was polymerized by free radical polymerization (FRP) in the presence of azobisisobutyronitrile (AIBN) initiator at 60°C. The structure of the synthesized polymer was characterized by the Fourier transform infrared (FT-IR), differential scanning calorimetry (DSC), and thermogravimetric analysis (TGA) methods. The bactericidal and fungicidal effects of the solutions prepared by adding methanol to this copolymer to prevent the growth of pathogenic bacteria, yeast, and fungi were evaluated by disk diffusion and broth microdilution method. Since the resistance of bacteria, yeast and fungi, which adversely affect human health, to antibiotics is an important issue, and there has not been any study on the antimicrobial properties of this copolymer, it has directed us to investigate its antimicrobial properties. According to antimicrobial susceptibility tests: The polymer solution showed a broad spectrum of antimicrobial action with 12.3–14.3 mm/inhibition zone diameter on Pseudomonas aeruginosa, Klepsiella pneumoniae, Enterococcus faecalis bacteria, Candida tropicalis, Epidermophyton floccosum yeast and fungi and showed a narrow spectrum of effect on inhibition of the growth of Candida albicans with 10.3 mm/inhibition zone diameter. No antimicrobial effects were observed on Staphylococcus aureus. The minimum inhibition concentration (MIC) value on the test microorganisms was determined as 125–31.25 μl. The data obtained prove that the polymer is in the same group as the interaction of bactericidal and fungicidal drugs. It is also important as a polymer with antimicrobial properties. This study aimed to produce a new polymer with antimicrobial properties. This polymer can be a new and yielding antimicrobial representative in different areas.

  • 
  AtıfScopus1·WoS1·OpenAlex1

  İncele
• MakaleYalnız künye2022Scopus SJRQ2/r/munzur/2545
  Naphthol green B Removal using a Novel Hydrogel Composite: Thermodynamics, Isotherms, Kinetics and Optimization by RSM

  Pıhtılı, Güzin; Tanyol, Mehtap; Birkan, Kubra

  In this study, the efficiency of the Poly(4-vinylpyridine-co-acrylamide) doped with EuCl3 {(Poly(4-VP-co-AAM)/EuCl3)} hydrogel synthesized in the laboratory by free radical in-situ polymerization method in removing naphthol green B (NGB) from wastewater was investigated. The structural properties of the adsorbent have been described by Fourier transform infrared spectroscopy (FT-IR), thermogravimetric analysis (TGA), scanning electron microscopy (SEM) and X-ray diffraction (XRD) analyses. The dependence of NGB adsorption performance on varying such as the amount of adsorbent, initial NGB concentration and contact time were investigated in a batch system. To determine the interaction effects of the selected parameters on the adsorption process and to optimize the adsorption capacity of the process, the central composite design (CCD) in the response surface methodology (RSM) was used. Optimum conditions were found to be 110 mg/L NGB concentration, 0.05 g/100 mL Poly(4-VP-co-AAM)/EuCl3/EuCl3 dosage and 165.81 min contact time. The adsorption capacity and removal efficiency under these conditions were 206.46 mg/g and 92.50 %, respectively. Experimental equilibrium data were in better agreement with the Langmuir isotherm. The kinetic results indicated that the adsorption process can be defined by pseudo-second-order kinetic with internal diffusion as one of the rate-determining steps. The adsorption process was found to be exothermic and spontaneous. Experimental results showed that dye can be successfully removed from wastewaters using Poly(4-VP-co-AAM)/EuCl3 hydrogel as adsorbent.

  • 
  • 
  AtıfScopus5·WoS5·OpenAlex6

  İncele
• MakaleAçık Erişim2022Scopus SJRQ4/r/munzur/2376
  Molecular Structure, Vibrational, Spectral Investigation and Quantum Chemical DFT Calculations of Poly(N-isopropyl acrylamide-co-nbutyl methacrylate)

  Pihtili, Güzin; Hekim, Seda; Pekdemir, Mustafa Ersin

  A new copolymer poly(N-isopropylacrylamide-co-nbutylmethacrylate) was synthesized by free radical solution polymerization process using 2,2′-Azobis(2-methylpropionitrile) as an initiator in 1,4-dioxane at 70 °C. The structure of the copolymer was characterized by Fourier Transform Infrared Spectrometer (FTIR), the proton nuclear magnetic resonance (1H NMR), and the ultraviolet-visible spectroscopy (UV-vis) method. Theoretically, density functional theory (DFT) (B3LYP) was utilized to identify the molecular geometry and then examine the vibrational frequencies and electrical characteristics of this molecule, with the 6-31G basis set in the ground state. In dichloromethane solution, UV-vis spectra of the molecule were calculated using the Time-Dependent DFT method. 1H NMR chemical shifts have been calculated with GIAO approximation, and the calculated results show good agreement with experimental chemical shifts.

  AtıfScopus2·WoS2·OpenAlex2

  İncele
• MakaleYalnız künye2022Scopus SJRQ1/r/munzur/2374
  Graphene-reinforced novel poly(acetoxystyrene-co-glycidylmethacrylate) composites: Synthesis and optimization of dielectric behaviors using response surface methodology

  Pihtili, Güzin

  In this work, a new copolymer synthesis of Poly(acetoxystyrene-co-glycidylmethacrylate) (P[AOS-co-GMA]) by free radical polymerization (FRP) method is reported. The polymer composites (P[AOS-co-GMA]/graphene), containing different amounts of graphene, were prepared by the solution casting technique. Composites of Poly(acetoxystyrene-co-glycidylmethacrylate) loaded with 2.03 mass%, 5.00 mass%, 7.97 mass%, and 10 mass% graphene. The structure of AOS-GMA systems was characterized by fourier transform infrared, 1H-NMR and scanning electron microscopy. Thermal features were evaluated by the thermogravimetric analysis and differential scanning calorimetry. The aim of this study is to optimize the ε′ (dielectric constant) and ε′′ (dielectric loss factor) of pure polymer and graphene-doped (2.03-5-7.97-10 mass%) P(AOS-co-GMA) composite using response surface methodology. For optimization of the process and creation of the mathematical model, the central composite design package was used. The significance of the process parameters in the model was evaluated by analysis of variance (ANOVA) research. The effects of process parameters, frequency (Hz), voltage (V), and graphene ratio (mass%) on ε′ and ε′′ were examined at ambient temperature. The maximum ε″ value (8.01) was reached at around the 699 Hz frequency and at 11.43 V voltage at the graphene content of 9.82 mass%. The model estimated the maximum value of the ε′′ (0.08) when the frequency was set at 51.20, the voltage was fixed at 1.16 and the graphene content was fixed at 9.97 wt%. The ANOVA results showed that frequency and graphene content were the main model parameters and had a remarkable effect on the dielectric properties. This article presents the development of a new polymeric composite and optimize effect of process parameters, such as frequency (A), voltage (B) and amount of graphene (C).

  AtıfScopus4·WoS4·OpenAlex4

  İncele
• MakaleAçık Erişim2021/r/munzur/6648
  Nhibitory Property of Poly (AN-co-VP) Copolymer on Some Dermatophyte Fungiand Yeasts Causing Fungal Infections

  Torgut, Gulben; Kirbag, Sevda; Sönmez, Pınar Erecevıt; Pıhtılı, Güzin

  Antimicrobial susceptibility test for poly (AN-co-VP) copolymer, which we think could be an ideal drug in treatment interventions was evaluated with disk diffusion method and minimum inhibitor concentration. In the antimicrobial measurement data, it was determined that the poly (AN-co-VP) copolymer dissolved in pure water is a significant inhibitory property against the growth of yeast (on Candida spp. with 11.33±0.3 mm barrier area) and dermatophyte fungi (on Epidermophyton sp. and Trichophyton sp.with 12.33±0.3 mm barrier area) (p<0.001) and no inhibitory properties were observed in preventing the growth of all bacteria (Escherichia coli, Pseudomonas aeruginosa, Klebsiella pneumoniae, Staphylococcus aureus, Bacillus megaterium). MIC limit values that prevent the growth of dermatophytes and yeasts supporting the disc diffusion method are 50-100 μL. This study is an alternative approach in order to limit the spread of superficial fungal infections they cause and eliminate these infections that tend to become chronic since this polymer extract has no inhibitory properties on bacteria but prevents the growth of yeast and dermatophytes.

  • 
  AtıfOpenAlex1

  İncele
• MakaleYalnız künye2021/r/munzur/6639
  Synthesis, Characterization and Electrical Impedance Analyzer Applications of P(ε-CL-co MMA)/Montmorillonite Composites

  Torgut, Gulben; Pıhtılı, Güzin

  In this study, Poly(ε-CL-co-MMA) was synthesized and its composites have beenprepared. Methyl methacrylate monomer was polymerized by the ATRP method in the presence of two armed macroinitiator Poly(ε-CL-NCl2). The composites of the copolymer were prepared with bentonite,which is a montmorillonite rate of 3%, 6% and 15% and their dispersion in the polymer was examined. Composites are prepared by dispersing method. The structure of the copolymer was characterized byFT-IR, 1H-NMR, DSC, TGA and SEM anaylsis methods. Different electrical properties of polymer /MMT composites were investigated with impedance analyzer device. Therefore, the effect ofmontmorillonite on the copolymers was examined depend on the frequency and temperature aselectrical. It was observed that electrical properties of polymers prepared with clay were higher thanpure polymer.

  İncele
• MakaleYalnız künye2021/r/munzur/6605
  İnsanlarda Ciddi Hastalıklara Neden Olan Bakteri, Maya ve Dermatofit Mantarları Üzerinde Poly (DMAA-co-MMA) 'nin İnhibe Edici Etkisi

  Kirbag, Sevda; Sönmez, Pınar Erecevıt; Pıhtılı, Güzin

  Bu çalışmada insanlarda ciddi hastalıklara neden olan bakteri, maya ve dermatofit mantarları gibi mikroorganizmalar üzerindeki poli dimetilakrilamid-ko-metilmetakrilat’ın poli P (DMAA-co-MMA) diklorometan içeren çözeltilerinin inhibitör etkilerini araştırıldı. Disk difüzyon yöntemi ile incelenen bu çözelti, Bacillus megaterium ve Klebsiella pneumoniae dışındaki tüm bakterilerin (Escherichia coli, Pseudomonas aeruginosa, Staphylococcus aureus) ve dermatofit mantarlarının çoğalmasını engelleyerek antimikrobiyal özelliğe sahiptir. Antimikrobiyal duyarlılık verilerinde, diklorometan içinde çözünen poli P (DMAA-ko-MMA) maya ve dermatofit mantarlarının büyümesine karşı inhibe edici bir etkiye sahiptir (Candida spp. üzerinde 11.3mm / inhibisyon alanı - 12.3 mm / inhibisyon alanı) ve Epidermophyton sp. üzerinde 11.3 mm / inhibisyon alanı - Trichophyton sp. üzerinde 11.3 mm / inhibisyon alanı) (P &lt;0.001). Disk difüzyon yöntemini güçlendiren MIC (Minimal inhibisyon konsantrasyonu) sınır değerleri bakteriler, mayalar, dermatofitlerin büyümesini engelleyen en küçük değer olarak 50-100 μL'dir (10 mL de 4500- 9000 μg). Antimikrobiyal bileşik, gelecek bu alandaki çalışmaları aydınlatmak için büyük avantaj sağlayabilir. Çalışmada kullanılan polimer, iltihaplanma ve mantar enfeksiyonlarına neden olan mikroorganizmalar ile savaşan antimikrobiyal polimerlere umut verici yeni bir katkı sağlayacaktır.

  • 
  İncele
• MakaleAçık Erişim2021Scopus SJRQ2/r/munzur/2807
  Electrical investigation on Eu+3- doped copolymer composite system and conventional kinetic analysis

  Pıhtılı, Güzin; Biryan, Fatih

  Poly(maleic anhydride-co-benzyl methacrylate) copolymer was prepared by using free radical polymerization (FRP) method at 70 °C. The structural characterization of the polymer was accomplished FT-IR, 1H and 13C NMR spectroscopic techniques. P(MA-co-BMA)/ EuCl3 composites were prepared rate of 2%, 5% and 10% (wt/wt). The thermal behavior of pure copolymer was investigated by thermogravimetric analysis (TGA) and differential scanning calorimetry (DSC). Thermal decomposition kinetics of poly(MA-co-BMA) carried out from Flynn–Wall–Ozawa method via TG curves for calculated apparent activation energies. According to FWO; the activation energy (Ea) was estimated as; 185.61 kJ/mol. Dielectric and electrical properties of copolymer/composite systems were investigated against frequency (range from 100 Hz to 20 kHz) at room temperature by using an impedance analyzer. The effect of EuCl3 concentration on dielectric constant, dielectric loss factors, ac conductivity, susceptance (B) and impedance (Z) was investigated. A remarkable increase was observed in dielectric and AC electrical properties were observed with the addition of Eu+3 to the polymer matrix. The B and Z parameters of poly(MA-co-BMA) and composites were investigated depending on frequency at room temperature based on the alternating current (AC).

  AtıfScopus2·WoS2·OpenAlex2

  İncele