Browsing by Author "Isik, Murat"

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Adsorptive Separation of Propionic Acid From Aqueous Medium Using Efficient Anion Exchange Resins in Batch and Fixed Bed Column Systems
(Wiley, 2025) Marti, Mustafa Esen; Isik, Murat; Zeidan, Hani
The recovery of propionic acid (PA) from aqueous medium using a strongly basic, Lewatit M-600 (LM-600), and a weakly basic, Lewatit MP-62 (LMP-62), anion exchanger was investigated. Medium conditions such as pH, temperature, PA concentration, and resin dose affected the performance of the process. The highest capacities were achieved at pH 5 and 2 with LM-600 and LMP-62, respectively. Equilibrium was reached in 35 min, and the process followed the pseudo-second-order kinetics for both anion exchangers. LMP-62 was more effective at pH values lower than 5. The exothermic process was found to be spontaneous. The maximum capacities of the strong and weak basic exchangers in batch experiments were 135.7 and 363 mg/g, respectively. However, the breakthrough capacities obtained in fixed bed systems were lower than those attained in batch systems (94.75 and 123.73 mg/g for LM-600 and LMP-62, respectively), and the column was successfully regenerated using 0.6 M NaOH. The Freundlich isotherm model yielded the highest determination coefficients in the isotherm analysis, suggesting that physical forces between PA and resins primarily drive the process.
Citation - WoS: 4
Citation - Scopus: 4
Multi-Walled Carbon Nanotubes and Graphene Oxide-Based Epoxy Hybrid Nanocomposites: Investigation of Nanofiller Modification Effect
(Elsevier, 2025) Ahmetli, Gulnare; Kocaman, Suheyla; Musayev, Nijat; Ozmeral, Nimet; Isik, Murat
Multi-walled carbon nanotubes (MWCNTs) are important nanomaterials utilized in various research and technological applications. Graphene oxide (GO) is another fascinating material that can be effectively applied in various fields, including nanocomposite materials, energy storage, biomedical applications, and catalysis. This study first examined the effect of hybridizing a 1:1 wt ratio mixture of modified carboxyl-functionalized MWCNTs (MWCNTCOOH) and graphene oxide (GO) nanofillers on the properties of novel epoxy resin (ER)based composites. GO was synthesized from graphite. The surface modification of both nanoparticles was performed using polyaniline (PANI) and/or ionic liquid 1-butyl-3-methylimidazolium bromide (IL). The hybrid reinforcement ratio in ER ranged from 0.5 % to 2 % by weight. At the reinforcement ratio of 1.5 wt%, the increase in tensile strength of all nanocomposites compared to ER varied between 22.2 % and 62.8 %. Modification with PANI showed improved mechanical, thermal, and electrical conductivity, as well as enhanced durability in hot water compared to IL. Additionally, PANI and IL further increased the chemical resistance of the hybrid nanocomposites. The highest and lowest glass transition temperatures (Tg) correspond to the 1.5 wt% PANIMWCNTCOOH/ GO (108.60 degrees C) and the IL-MWCNTCOOH/ GO (97.99 degrees C) hybrid nanocomposites, respectively. The electrical conductivity ranges in value from 6.9 x 10-8 to 1.22 x 10-4 S/cm, depending on the hybrid nanocomposite type. The nanocomposites demonstrated superior UV resistance compared to ER, showing an absorbance range of 0.305 to 1.391 a.u. Furthermore, the ANOVA test demonstrated the impact of the hybrid filler type and ratio on the nanocomposite's mechanical properties.