Browsing by Author "Gülcan, M."

Now showing 1 - 11 of 11

Adsorption: Basics, Properties, and Classification
(Elsevier, 2023) Gökırmak Söğüt, E.; Gülcan, M.
The emerging industry to meet the demand of developing countries and the growing population causes many pollutants. Adsorption is a widely used waste removal method in many fields. Adsorption involves the transport of the adsorbate to specific areas on the adsorbent, and the adsorption reactions in these areas typically involve physical or chemical bonding between the adsorbate and the adsorbent. The adsorption reaction performance is greatly affected by the parameters that control the adsorption process, such as pressure, temperature, adsorbent properties of adsorbent, and the surface area of the adsorbent. Nanoscale materials (nanoadsorbents), widely used in recent years, still make the adsorption method popular with their changing surface properties and high adsorption efficiency. This chapter summarizes the basic working principle of adsorption, compares adsorption and other separation processes, and explains the basics of adsorption process along with the adsorption classification. © 2023 Elsevier Inc. All rights reserved.
Antibacterial Activity of Copper-Decorated Ceo2 Nanoparticles and Preparation of Antifouling Polyethersulfone Surface
(Elsevier Ltd, 2024) Şener, L.; Özdemir, S.; Yalçın, M.S.; Gülcan, M.; Dizge, N.
Cerium oxide NPs (nano-CeO2), with notable performance in various biological tests like redox activity, free radical scavenging, and biofilm inhibition, emerge as significant candidates to address issues in related areas. In this research, copper-decorated nano-CeO2 (Cu@nano-CeO2) were first synthesized and then characterized using advanced techniques such as SEM-EDX, XRD, XPS, BET, and ICP-OES. The biochemical properties of the obtained Cu@nano-CeO2 nanostructure and its performance in polyethersulfone (PES) membranes were thoroughly investigated in this research study. The free radical scavenging effect of Cu@nano-CeO2 at 100 mg/L concentration was determined as 100 % with the same activity as the reference compounds Trolox and ascorbic acid. It enhanced 2.9-fold α-amylase enzyme activity at 50 mg/L. Plasmid DNA was completely degraded at 100 mg/L concentration. Cu@nano-CeO2 provided significant inhibition against tested bacterial and fungal strains, especially Gram-positives than Gram-negatives and fungus. Anti-biofilm activity was determined against S. aureus and P. aeruginosa as 98.3 and 82.1 %, respectively. Furthermore, E. coli inhibition activity of PES/Cu@nano-CeO2 1.0 wt% membrane was determined as 100 %. Owing to the promising results obtained, we can suggest that Cu@nano-CeO2 can be used in wastewater treatment. © 2024 The Authors
Carbon-Based Nanostructures and Nanomaterials
(Elsevier, 2020) Karaca, B.; Karataş, Y.; Cakar, A.B.; Gülcan, M.; Şen, F.
Carbon has been used in many different ways throughout history, including human life and technology. Since ancient times, coal, carbon black, and graphite have been used for writing and drawing. Recently, conjugated carbon nanomaterials especially carbon nanotubes and fullerenes have been used as a material to store energy due to its unique properties. In the last 10years, nanostructures and nanomaterials have taken attentions extensively due to having many advantages including excellent mechanical, thermal, chemical, and electrical. Therefore, carbon-based nanostructures and nanomaterials nowadays found the opportunity to be applied in numerous areas such as electronics, sensors, composite materials, drug delivery, energy conversion and storage, and field emission devices. In the 21st century, the capacity of these materials and the impressive aspects as environmentally safe and green fabrication processes and industrial production of carbon-based nanostructures and nanomaterials are extremely necessary, and therefore, it can be defined as the primary research field for technological and scientific applications. This section provides a broad overview of the fundamental properties of carbon-based nanostructures and nanomaterials, simple synthesis methods and a wide range of technological and industrial applications. © 2021 Elsevier Inc. All rights reserved.
Enhancement of Adsorption Capabilities by Surface Functionalization
(Elsevier, 2023) Gökırmak Söğüt, E.; Gülcan, M.
Adsorption is a surface treatment that results in the transfer of gases or solutes to the surface of the adsorbent. Adsorption affinities depend on selective adsorption and are inevitably different for each type of adsorbate. The choice of different surface functionalities can enhance or inhibit specific adsorption interactions. The effect of functional groups on the adsorption properties of various porous materials is a topic that has been extensively studied, but recent studies continue to provide unexpected results. The effect of each functional group strongly depends on the porous material and the adsorption mechanism. Therefore functionalization methods to increase the density of the potential energy well in the adsorption regime and porous materials with different pore sizes and shapes are being developed, which are directly related to their ability to maximize overlapping potentials. In this chapter, surface functionalization and the impact of this change on the adsorption capacity are discussed. © 2023 Elsevier Inc. All rights reserved.
Graphene Functionalizations on Copper by Spectroscopic Techniques
(Springer International Publishing, 2019) Gülcan, M.; Aygün, A.; Almousa, F.; Burhan, H.; Khan, A.; Şen, F.
Graphene is a two-dimensional allotrope of the carbon element, which is one of the most powerful materials of the 21st century. In order to facilitate the processing of the graphene, solvent-supported methods such as rotation coating, layer by layer assembly, and filtration are used. Single layer graphene prevents agglomeration of the material while reducing reactions occur. According to the studies in the literature, the chemical functionalization of graphene is performed by covalent and non-covalent modification techniques on substrate like copper. Besides, graphene can be used in many material production areas, such as polymer nanocomposites, drug delivery system, supercapacitor devices, solar cells, biosensors, and memory devices. © 2019, Springer Nature Singapore Pte Ltd.
Magnetic Nanoparticles
(Elsevier, 2020) Acidereli, H.; Karataş, Y.; Burhan, H.; Gülcan, M.; Şen, F.
Magnetic nanoparticles (MNPs) have widespread attention because of their unique features. For a few decades, growing development in chemical synthesis of nanomaterials and material surface modification have been seen and performed in numerous applications including biomedicine, biotechnology, catalysis, magnetic chemistry thermoelectric materials, etc. Various methods for fabrication of MNPs which have a controllable size, distribution, and surface modification have been reported. In these methods, several techniques containing irradiation, microwave, ultrasonication, vapor deposition, electrochemical, and microwave are applied to produce MNPs either in bottom-up or top-down processes. Generally, magnetic synthesis of nanoparticles is carried out by using these two processes. Nanomaterials with magnetic properties have wide applications in many fields such as biology, medicine, and engineering. In this section, the recent developments in the structures, occurrences, most commonly used samples, and common areas of use of the MNPs are given. © 2021 Elsevier Inc. All rights reserved.
Mxene-Based Hybrid Nanostructures for Detection and Purification of Dyes and Pesticides
(Elsevier, 2024) Söğüt, E.G.; Gülcan, M.
The rapid development of various industries and the growing global population pose a threat to all resources. The increase in pollutants, such as organic dyes and pesticides—among the most common contaminants—has emerged as a major global health concern. Dyes, with their many possible uses, end up in bodies of water every year and contribute to water pollution. In addition, modern agriculture uses pesticides to increase productivity, resulting in increased concentrations of agricultural and landscape pesticides and sources of pollution. Effective, robust, and economically viable methods to treat pollutants or reduce waste with minimal impact on the environment are essential. MXene and its derivatives emerge as ideal candidates for water treatment, boasting unique properties such as ease of preparation, adjustable pore size, high porosity, acceptable conductivity, and favorable stability. Additionally, they exhibit outstanding catalytic performance against various hazardous pollutants. These materials present unique physicochemical properties and ultrathin layer structures and offer promising potential for water and wastewater treatment. This chapter provides an overview of the effectiveness of MXene and its functionalized hybrid models in dye and pesticide removal, the employed removal methods, and potential advantages and disadvantages. The aim is to develop a safer and more efficient treatment strategy. © 2025 Elsevier Inc. All rights reserved.
Mxene-Based Hybrid Nanostructures for the Detection and Purification of Organic and Inorganic Pollutants
(Elsevier, 2024) Söğüt, E.G.; Gülcan, M.
Organic and inorganic compounds, which play crucial roles in our daily lives, significantly contribute to our overall quality of life. Nevertheless, the negligent use of these chemical compounds in the production process of any product has a profound impact on both life and the environment. Many organic and inorganic pollutants pose major environmental and health risks. In order to reduce or prevent their release into the environment, it is crucial to develop and update environmentally friendly techniques. In recent years, increasing attention has been paid to the environmental impacts of these pollutants. Various techniques have been developed to treat different types of pollutants, focusing on minimum quantities and easy-to-prepare samples for these methods. Notably, nanostructured samples, especially MXenes, have gained popularity due to their unique physical constitution and chemical properties. MXenes exhibit large functional surface areas, very large specific surface areas, hydrophilicity, high electron density, and inherent metallic conductivity. This chapter presents the toxic effects of organic and inorganic pollutants and explores the effectiveness of MXene-based hybrid nanomaterials in their removal. Additionally, the techniques used in removing pollutants with MXene-hybrid nanomaterials, along with their advantages and disadvantages, are discussed. Finally, gaps for future research in this field are highlighted. © 2025 Elsevier Inc. All rights reserved.
The Novel Pyridine Based Symmetrical Schiff Base Ligand and Its Transition Metal Complexes: Synthesis, Spectral Definitions and Application in Dye Sensitized Solar Cells (Dsscs)
(Springer New York LLC, 2018) Gencer Imer, A.; Syan, R.H.B.; Gülcan, M.; Ocak, Y.S.; Tombak, A.
The pyridine based azo-linked symmetrical Schiff base ligand, (E)-2,2′-((1E,1′E)-(pyridine-2,6-diylbis(azanylylidene))bis(methanylylidene))bis(4-((E)-phenyldiazenyl)phenol) (H2L), and its Co(II), Ni(II) and Pd(II) transition metal complexes were prepared, and defined by using elemental analysis, Fourier transform infrared, UV–visible, mass, nuclear magnetic resonance spectra, molar conductance, magnetic susceptibility and thermal analysis techniques. The conductivity results pointed out the non-electrolytic nature of all metal complexes. Elemental composition, ultraviolet spectra and magnetic susceptibility data showed that the synthesized complexes are in the binuclear structure and square plane geometry. When compared to the characteristic infrared bands for the functional groups of the ligand structure with complex molecules are reached, the ligand binds to the metal atom via phenolic OH and azomethine-nitrogen. Furthermore, the dye-sensitized solar cells (DSSCs) based on H2L and its metal complexes were fabricated, and photovoltaic properties of these devices were also investigated. The power conversion efficiency of fabricated devices based on ligand H2L can be improved with the incorporation of the transition metal complex. © 2017, Springer Science+Business Media, LLC.
Polyethersulfone Membranes Modified With 2D Mxene-Cuo Nanocomposites for Protein Rejection and Investigation of Antimicrobial Properties
(Elsevier B.V., 2025) Şener, L.; Alterkaoui, A.; Özdemir, N.C.; Dizge, N.; Özdemir, S.; Serkan Yalçın, M.; Gülcan, M.
This study examines the effects of incorporating three MXene-CuO nanocomposites – Ti3C2Tx/CuO, V2CTx/CuO and Nb2CTx/CuO- into polyethersulfone (PES) membranes. The study aims to enhance the antifouling and permeation properties of PES membranes for bovine serum albumin (BSA) filtration. The experimental design involved adding each MXene-based composites to PES membranes at a fixed concentration of 1 %. These composite membranes were then evaluated using a dead-end filtration system. Their performance was compared to that of a control membrane composed of pure PES without any MXene-based nanocomposites. The results revealed significant improvements in BSA rejection efficiency. The pristine PES membrane achieved a rejection rate of 61.42 %, while the three composite membranes containing MXene-based nanocomposites showed complete BSA rejection, achieving 100 % removal efficiency. The synthesized MXene-based nanocomposites were also assessed for in vitro antioxidant, antidiabetic, DNA nuclease, antibiofilm and antimicrobial activities. V2CTx/CuO exhibited 90.27 % antioxidant activity. Antidiabetic activity of V2CTx/CuO and Ti3C2Tx/CuO was achieved as 86.42 % and 96.46 %. All compounds caused single-strand DNA cleavage at 50 and 100 mg/L doses and double-strand cleavage caused at 200 mg/L dose. The low MIC values obtained revealed that the compounds presented effective antibacterial properties. V2CTx/CuO, Nb2CTx/CuO and Ti3C2Tx/CuO was also displayed influential microbial growth inhibition as 82.79 %, 98.62 % and 100 %, respectively. The highest antibiofilm activity against S. aureus and P. aeruginosa for V2CTx/CuO, Nb2CTx/CuO and Ti3C2Tx/CuO was 71.25 % and 56.85 %; 87.91 % and 69.16 %; and 92.55 % and 84.22 %, respectively. It was also found that the antimicrobial surface of PES membrane doped with 1 % V2CTx/CuO, Nb2CTx/CuO and Ti3C2Tx/CuO displayed 72.58 %, 84.62 %, and 95.49 % antibacterial ability, respectively. © 2025 Elsevier B.V.
Transition Metal (Ii) Complexes With a Novel Azo-Azomethine Schiff Base Ligand: Synthesis, Structural and Spectroscopic Characterization, Thermal Properties and Biological Applications
(Springer New York LLC, 2017) Yeğiner, G.; Gülcan, M.; Işık, S.; Ürüt, G.Ö.; Özdemir, S.; Kurtoğlu, M.
The pyrimidine based azo-linked Schiff base ligand, 5-benzoyl-1-((E)-(2-hydroxy-3-methoxy-5-((E)phenyldiazenyl)benzylidene)amino)-4-phenylpyrimidin-2(1H)-one (HL), and its transition metal (II) complexes were synthesized and defined by using 1H-NMR, 13C-NMR, Elemental analysis, FT-IR, MS, UV–vis, molar conductance, magnetic susceptibility and thermal analysis techniques. According to the conductance data obtained indicate all of the metal complexes have non-electrolytic nature. Square pyramidal geometry for Pd(II) and octahedral geometry for all the other complexes synthesized was concluded from the electronic absorption spectra and magnetic susceptibility measurements of the complexes. Investigation of the significant infrared bands of the active groups in the ligand and the solid complexes alludes that HL is coordinated to the metal ions ONO tridentate manner. Moreover, the absorption and emission properties of the azo-azomethine based ligand and its complexes were investigated. The results obtained show that fluorescence emissions of the ligand and its metal (II) complexes depend on the type of transition metal ions and the derivatives displayed moderate Stokes’ shift values between 44 and 107 nm. All the compounds exhibited superb photostability. Further, antioxidant, antimicrobial and pBR322 plasmid DNA cleavage activities were investigated. All compounds showed good DPPH• (1,1-diphenyl-2-picrylhydrazyl) radical scavenging activity and complexes of [MnL2]•H2O and [NiL2]•H2O exhibited excellent metal chelating activity. All the compounds tested demonstrated two strand DNA cleavage activities. © 2017, Springer Science+Business Media, LLC.