Aksaray Üniversitesi Kurumsal Akademik Arşivi
DSpace@Aksaray, Aksaray Üniversitesi tarafından doğrudan ve dolaylı olarak yayınlanan; kitap, makale, tez, bildiri, rapor, araştırma verisi gibi tüm akademik kaynakları uluslararası standartlarda dijital ortamda depolar, Üniversitenin akademik performansını izlemeye aracılık eder, kaynakları uzun süreli saklar ve telif haklarına uygun olarak Açık Erişime sunar.
Güncel Gönderiler
Effects of reducing long-term groundwater overdraft in uluova micro-basin
(Springer Science and Business Media Deutschland GmbH, 2025) Şekerci, Kürşat; Tuna, M. Cihat; Doğan, Mustafa Şahin
Recently, groundwater use has increased significantly in response to limited surface water availability in arid and semi-arid regions. This trend has led to increasing concerns about declining groundwater levels and the risk of overdraft. For the above reasons, a hydroeconomic model was developed in this study to evaluate various management scenarios aimed at mitigating the negative impacts of groundwater overdraft. The Uluhem hydroeconomic model focuses on a total of six different water management operations with different physical constraints. The first scenario is a baseline water operation with groundwater pumping (with overdraft), while the next four scenarios cover four different water management operations where groundwater pumping is restricted at different rates (without overdraft). The sixth and final scenario investigates the installation of a solar-powered system to pump water from a nearby surface water reservoir. This last scenario seeks a potential solution to completely eliminate the agricultural water scarcity and associated scarcity costs arising from the first five scenarios. With the Uluhem model, the water deliveries, water scarcity and economic impacts of these six different management scenarios are analyzed. The findings show that the four different scenarios in which groundwater pumping is restricted contribute positively to the groundwater reservoir but increase water scarcity. The solar power plant installation scenario, on the other hand, offers a promising and sustainable solution that not only effectively addresses water scarcity but also eliminates the associated costs. The study investigates the factors contributing to groundwater overdraft and seeks a sustainable solution to current groundwater utilization. The results emphasize the urgent need for effective and sustainable water management strategies to prevent groundwater overdraft. Overall, the study provides valuable insights into groundwater overdraft problems in the Uluova micro-basin and emphasizes the importance of adopting long-term, sustainable groundwater management practices.
Application of Fenton and UV–Fenton Reaction for Resin Wastewater Treatment Detection of Residual H2O2
(Wiley-VCH Verlag, 2025) Özcan, Zeynep; Sönmez, Gamze; Işık, Mustafa
The Fenton and UV–Fenton procedures were utilized in this study to eliminate total organic carbon (TOC) from wastewater generated during actual resin manufacturing. Optimal operating parameter values influencing removal efficiency were identified, including initial H2O2 and Fe2+ concentrations and total reaction time (t). The residual H2O2 concentration was measured using the metavanadate method in all processes. The results indicated that the Fenton process achieved a TOC removal rate of 32.0% at concentrations of 500 mg L−1 for H2O2 and 100 mg L−1 for Fe2+, with a constant pH of 3.78 and a reaction time of 6 h. In the UV–Fenton process, H2O2 concentrations of 500 and 1000 mg L−1 were examined, resulting in 14% and 15% TOC removal efficiencies, respectively. The effect of gradually adding H2O2 on the removal efficiency was also investigated in this study. To do this, the Fenton process started with an initial H2O2 concentration of 250 mg L−1. Once approximately 80% of this amount was consumed, 250 mg L−1 H2O2 was added, and the process continued. A maximum TOC removal of about 71% was achieved by gradually adding H2O2 at a 4000 mg L−1 concentration. On the basis of these findings, the gradual addition of H2O2, as opposed to an initial dose, proved to be a significant and practical method for removing organic matter from wastewater in the Fenton process. © 2025 Wiley-VCH GmbH.
Sustainable utilization of corn waste and their role toward the circular economy
(Elsevier B.V., 2025) Maqsood, Sammra; Navaf, Muhammed; Kumar, Prashant; Yücetepe, Aysun; Trang Thuy, Nguyen Ngoc; Özkan, Gülay; Moreno, Andres; Çapanoğlu, Esra; Khalid, Waseem; Esatbeyoğlu, Tuba
Corn is one of the most widely cultivated cereal crops globally. Its processing generates enormous amounts of agricultural residues, such as corn husk, corn cob, and corn silk. These by-products exhibit immense potential for value addition in the circular economy. However, these are often discarded or underutilized. This review deals with sustainable and innovative approaches for the effective utilization of different corn waste materials, emphasizing their constituents and applications. The advancement in technology, enables the transformation and value addition of corn waste residues into sustainable eco-friendly biomaterials, such as bioplastics, bioethanol, activated carbons, fiber, and bioactive compounds, contributing to the goal of the circular economy. The challenges, policy framework, and future perspectives of the sustainable utilization of corn waste materials are also discussed. This review aims to provide a comprehensive understanding of corn waste valorization strategies and their transformative role in promoting a circular bioeconomy.
Innovative bio-based active packaging: Functional composite films reinforced with biochar for meat preservation
(Elsevier B.V., 2025) Akyüz Yılmaz, Bahar; Aydın, Furkan; Kahve, Halil Ibrahim; Günay Kamçı, Kübra; Bozkurt, Şevval Beyza; Akyüz, Lalehan
The growing demand for safe and sustainable meat products is driving innovations in food packaging. Biodegradable and renewable materials offer promising alternatives, though developing films with strong and multifunctional properties remains challenging. This study presents alginate-gelatin-PEG-based composite films incorporated with biochar derived from oleaster seeds to enhance meat preservation. Films were fabricated at varying concentrations of biochar and characterized using FT-IR, TGA, XRD, SEM, and BET analyses. The incorporation of biochar significantly modified the physicochemical and structural properties of the films. The films containing higher biochar content showed maximum thermal stability with 400 °C and enhanced antioxidant activity, with 77.84 % DPPH scavenging. Microbiological and biochemical tests revealed that the biochar-enhanced films inhibited lipid oxidation, reduced protein degradation, and suppressed bacterial growth. Films with higher biochar content extended beef shelf life by at least 5 days and completely eliminated S. aureus by day 10. These findings propose that biochar-enhanced composite films offer an effective and sustainable approach to prolong meat shelf life and improve food safety.
Catalyst-driven strategies for organic matter and disinfection byproduct removal: Comparing adsorption, ozonation, and catalytic ozonation
(Elsevier Ltd, 2025) Alver, Alper; Baştürk, Emine; Kılıç, Ahmet; Altınışık Tagaç, Aylin
Effective removal of natural organic matter (NOM) and its disinfection byproduct (DBP) precursors is vital for ensuring drinking water safety. This study systematically compared adsorption, sole ozonation, and catalytic ozonation using TiO2, goethite, silver nanoparticles, and iron-coated pumice as catalysts. Treatment performance was evaluated based on reductions in dissolved organic carbon (DOC), UV absorbance at 220, 254, and 272 nm, and DBP formation potentials (trihalomethanes (THMs) and haloacetic acids (HAAs)). Catalytic ozonation with TiO2 exhibited superior performance, achieving ~87 % DOC removal and > 93 % reduction in UV254 and UV272 absorbance. It also led to a > 94 % decrease in THM and HAA formation potentials, resulting in estimated carcinogenic risks well below regulatory thresholds set by the WHO and EPA. These risk estimates carry inherent uncertainties, particularly for emerging DBPs, yet remain valid indicators for comparing treatment efficacy. Goethite also demonstrated high DBP precursor removal (~73 %) with relatively low operational cost, while iron-coated pumice achieved moderate effectiveness (~67 %) but suffered from reduced longevity. Adsorption and sole ozonation were notably less effective. Statistical analysis confirmed significant performance differences among the catalysts, with TiO2 emerging as the most efficient and cost-effective option. The enhanced performance of TiO2 was attributed to its strong oxidative properties and affinity for both aromatic and aliphatic NOM fractions. These findings underscore the potential of catalyst-enhanced ozonation as a powerful strategy for NOM and DBP control, providing a technically and economically viable path toward meeting increasingly stringent drinking water standards and reducing long-term public health risks. © 2025 Elsevier Ltd.
