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- 저자 : Suheyla Kocaman (검색결과 2 건)
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Kocaman Suheyla 한국탄소학회 2023 Carbon Letters Vol.33 No.3
In this study, superior carbon nanotubes (CNT) were chemically modified with itaconic acid (IA) and a polyaniline (PANI) composite was formed and used to remove methylene blue (MB) dye from an aqueous solution. The capacity of CNTs modified with IA (IA/CNT) and composited with PANI (PANI/CNT) to remove MB dye from an aqueous solution was compared and investigated. The effects of parameters such as pH (3–10), adsorbent dose (0.8–8 g/L), initial dye concentration (10–100 mg/L), and temperature (25–55 °C) on MB adsorption were investigated. IA/CNT and PANI/CNT adsorbents were characterized by analyzes such as Fourier Transform Infrared Spectroscopy (FT-IR), Field Emission Scanning Electron Microscopy (FE-SEM), transmission electron microscope (TEM), and Brunauer, Emmett and Teller (BET). It was determined that the isotherm data fit the Langmuir isotherm model. The maximum adsorption capacity (qmax) of PANI/CNT and IA/CNT calculated according to this model (at 25 °C) was 12.78 and 32.78 mg g−1, respectively. Thermodynamic analysis results showed that the adsorption was exothermic, feasible, and spontaneous. It can be said that the possible mechanism of MB on PANI/CNT and IA/CNT adsorbents occurs with the participation of π–π interaction, electrostatic attraction and hydrogen bonding.
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Evaluation of EPDM waste in environmentally friendly epoxy hybrid composites
Melisa Temiz,Suheyla Kocaman,Gulnare Ahmetli 한국공업화학회 2023 Journal of Industrial and Engineering Chemistry Vol.126 No.-
This study aims to reduce the production cost of composite materials, obtain composite materials withimproved properties, and expand the applications of waste rubber composites using two different industrialwastes, ethylene-propylene-diene monomer rubber (EPDM) and tire waste pyrolysis solid productcarbon black (CB). Composites were formed by adding EPDM waste or EPDM-CB mixture at 1:1, 1:3,and 3:1 ratios to bisphenol-A type epoxy resin in different weight ratios. Mechanical, water sorption,electrical conductivity, and flammability tests were applied to the composites. The effect of the EPDM:CB ratio and some environmental conditions on the mechanical properties of the hybrid composites wereinvestigated. Composites with 3:1 weight ratio of EPDM:CB had the highest tensile strength, which variedbetween 115.5–158.6 MPa. Increasing the EPDM ratio in an epoxy matrix and hybrid filler decreased thecomposites’ density and tensile strength. EPDM-CB hybrid filler increased the thermal strength of epoxy. Mechanical properties are affected by water sorption, low temperature, and UV irradiation. Increasing theCB ratio in the hybrid filler decreased the flammability of the hybrid composites. ANOVA is applied to findthe significant effect of different weight percentages of hybrid fillers and different varieties of fillers onthe mechanical properties of composites.
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