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Öğe A COMPREHENSIVE BIBLIOMETRIC OVERVIEW ON THE TOXICITY OF TEXTILE DYES: 2010-2024(Gh Asachi Technical Univ Iasi, 2024) Salman, Busra; Sonmez, Vildan Zulal; Akarsu, Ceyhun; Sivri, NuketThere is a growing awareness in the literature of the potential hazards of dyestuffs in wastewater, particularly their toxicity and carcinogenic effects on aquatic life. This has led to an increasing focus on the need for alternative treatment methods in response to these concerns. This study, therefore, aims to conduct a bibliometric analysis utilizing the Scopus database, focusing on the keywords toxicity, dye, and textile to identify research trends, track research hotspots, and determine future research directions from 2010 to April 30, 2024. Bibliometric indicators and visual representation maps were used to analyse the retrieved data quantitatively and qualitatively. The results indicated that most studies were conducted using laboratory-prepared wastewater with a rate of 75%. It was also found that research on the acute toxicity of textile wastewater is mainly carried out with real wastewater. The leading journals for research in this area were found to be Chemosphere, Environmental Science and Pollution Research and Journal of Hazardous Materials with the countries of India and Brazil ranked first and second in the number of articles published. In addition, current regulations and procedures for wastewater treatment were examined, and several potential future study opportunities for researchers were suggested. The findings show that bibliometric analysis is a practical approach to measure research hotspots and trends both qualitatively and statistically.Öğe Fingerprinting of Critical Raw Materials in Lacustrine Systems on Horseshoe Island, Antarctic Peninsula(Central Fisheries Research Inst, 2024) Sivri, Nuket; Ercan, Nevra; Akarsu, Ceyhun; Erturac, M. Korhan; Altay, Melek Cumbul; Sonmez, Vildan Zulal; Hiz, Mustafa BurakModern industry increasingly relies on advanced technologies that require various critical raw materials (CRMs) for their development and functionality. These materials, which are essential for technological innovation and everyday applications, face significant supply risks, hence they are categorized as critical raw materials. Recent studies have highlighted the ecological and geochemical importance of CRMs in lakes of different geological origin, yet detailed studies on their distribution in polar lacustrine systems remain limited. This study, therefore, aims to address this gap by quantifying concentrations of specific CRMs- boron (B), cerium (Ce), gallium (Ga), germanium (Ge), gadolinium (Gd), lanthanum (La), lithium (Li), nickel (Ni), neodymium (Nd), palladium (Pd), platinum (Pt), titanium (Ti), and yttrium (Y)-in surface waters of nine lacustrine systems sampled during the T & uuml;rkiye's National Antarctic Scientific Expedition-2024. The analysis revealed measurable values for B, Ga, Nd, Ni and Ti, while the concentrations of Ce, Ge, Gd, La, Li, Pd, Pt and Y remained consistently below the detection limit. Of the lakes analyzed, Clincher Lake had the highest concentrations, with notable values for B (85.2 ppb), Ti (58.1 ppb) and Ni (18.2 ppb). Remarkably, these elevated levels were measured in a lake furthest from shore, highlighting the possible influence of unique environmental or geological factors. These results emphasize the importance of continuously monitoring and comprehensively analyzing the distribution of CRMs in polar lacustrine and marine ecosystems. Such efforts are crucial for assessing the environmental risks associated with CRMs and for understanding their broader ecological impacts.Öğe Microplastic contamination in surface waters of the Kucukcekmece Lagoon, Marmara Sea (Turkey): Sources and areal distribution(Elsevier Sci Ltd, 2021) Cullu, Ahmet Faruk; Sonmez, Vildan Zulal; Sivri, NuketThe distribution of freshwater and marine microplastics (MPs) varies due to the difference in fresh and seawater densities and MP sources. This study aims to investigate the abundance of MPs and their possible sources in surface waters of different ecosystems, such as sea, lagoon, and lake. We classified MPs in terms of their color and type and established the relationship between the MPs in surface waters with different characteristics. The mean MP abundance (33 particles L-1) detected herein was higher than that in the previously conducted studies. Fragment particles (37.95%) were determined to be the dominant MP type, and the predominant MP color was blue (75.28%). As for the seasonal MP distribution, its highest content (48.03 particles L-1) was observed in autumn, unlike that reported by other studies. The findings of this study reveal the effects of wastewater treatment plant (WWTP) discharge and current flow on the MP distribution in the study area. This study aims to provide representative data on the MP abundance and distribution, as well as MP-affecting parameters for similar aquatic areas in other parts of the world. (C) 2020 Elsevier Ltd. All rights reserved.Öğe Rhamnolipid: nature-based solution for the removal of microplastics from the aquatic environment(Oxford Univ Press, 2025) Sonmez, Vildan Zulal; Akarsu, Ceyhun; Sivri, NuketOver the past two decades, research into the accumulation of small plastic particles and fibers in organisms and environmental settings has yielded over 7,000 studies, highlighting the widespread presence of microplastics in ecosystems, wildlife, and human bodies. In recent years, these contaminants have posed a significant threat to human, animal, and environmental health, with most efforts concentrated on removing them from aquatic systems. Given this urgency, the purpose of this study was to investigate the potential of rhamnolipid, a biosurfactant, for the removal of microplastics from water. Specifically, this study evaluates the effects of water matrix, initial pH of the solution (7.0, 7.5, 8.0, 8.5, 9.0, 9.5, and 10.0), concentrations of alum (5, 10, 20, 30, 40, and 50 mg/L), and concentrations of rhamnolipid (1, 5, 10, 20, 40, 80, and 100 mg/L). Optimum removal was achieved at alum and rhamnolipid concentrations of 5.0 mg/L and 1.0 mg/L, respectively, with a solution pH of 8.0. In both types of water tested, a removal efficiency of about 74% was determined, indicating the potential of rhamnolipid as a nature-based solution to control microplastic pollution in surface waters.Öğe Seasonal Distribution, Characterization, Indexing and Risk Assessment of Micro- and Nanoplastics in Coastal Sediments: a Case Study from Istanbul(Springer Int Publ Ag, 2024) Akarsu, Ceyhun; Sonmez, Vildan Zulal; Sivri, NuketMicroplastics (MPs) and nanoplastics (NaPs) in coastal regions, particularly in sediments, have gained increasing attention. However, in T & uuml;rkiye, research on sediment pollution by MPs and NaPs is still limited. To fill this knowledge gap, the distribution, composition, and ecological impact of MPs and NaPs were investigated for the first time in the literature over a one-year period at three sampling stations on the south coast of Istanbul. The average total particle concentration was 1364.17 +/- 600.51 particles.kg-1 dw sediment. Most of the MPs detected in the sediments were in the form of fibers with a size of 100-250 mu m and were black and transparent. The study found that NaPs accounted for only 17%, 13.8% and 11.8% of the particles collected at stations S1, S2 and S3, respectively. According to the FTIR results, polyethylene and polyethylene terephthalate were the most abundant compared to polypropylene, polyamide and other polymers. The hazard index was classified as level V with a value of 17,261. This classification emphasizes the urgent need for further comprehensive studies on the risk assessment of MPs and NaPs. Scanning electron microscopy results showed microorganisms on the particle surface, indicating the MP-associated passing-through mechanism. Moreover, energy dispersive spectroscopy detected several unexpected elements such as Nb, Sr, Mo, Bi, Ta and Rn on MP and NaP surfaces. The results indicate that MP and NaP pollution in Istanbul's coastal sediments may pose a major risk to the environment through the leaching of inherent/adsorbed elements and therefore requires future investigation.
