No abstract

The adsorption of arsenic from aqueous solution onto natural and modified zeolites was investigated. The natural zeolites were modified by ion-exchange (NH 4 NO 3) and addition of aluminum (Al 2 (SO 4) 3). The natural and modified zeolites were characterized by XRF, XRD, N 2 sorption, FTIR, NH 3-TPD, zeta potential and SEM. Ion-exchange with NH 4 + of NZ results in the significant exchange of most cations and an increase in surface area and pore volume of samples as well as surface acidity. While the introduction of aluminum into the zeolite increased its As (V) removal amount, it decreased its As (III) removal. Ion-exchange with NH 4 + of the natural zeolite increased significantly its As(III) and As(V) adsorption capacity. The adsorption of both As(III) and As(V) with natural and modified zeolites obeys pseudo second order kinetics. The Langmuir isotherm model for all adsorbents was best fitted to the isotherm data obtained. The highest adsorption capacity for As(III) and As(V) was obtained onto the zeolite modified with ammonia and their calculated qm values are 28.7 mg/g and 36.6 mg/g, respectively. The calculated thermodynamic parameters indicated that the adsorption process was spontaneous and favorable.

Problems such as changes in people's lifestyles and standards and environmental pollution have seriously affected human health. It is known that many substances that people eat, drink, use in daily life and are exposed to are harmful to human health. At the beginning of these substances are the substances called “chemicals”. The use of these chemicals has accelerated with the development of industry and technology. It has been determined that many chemicals, which were previously considered harmless, cause diseases, irreversible damages and deterioration of the genetic structure over time. Cancer is one of the diseases caused by these chemicals. In the cancer statistics of 2020, it has been reported that there are 201 cases of cancer in every 100 thousand people in the world. Despite all the successes in the diagnosis, treatment and prevention of cancer in recent years; unfortunately, the war waged by scientists against cancer has not been fully won yet. In this study, the relationship between cancer and chemicals that are frequently used in daily life without being aware of it are discussed.

Hızlı nüfus artışı, gelişen sanayi ve teknoloji ile enerji ihtiyacının artmasına neden olmuştur. Artan enerji talebinin karşılanması için fosil kaynakların kullanımının artması ile ilkim değişikliği, sera etkisi gözlenmesi ve ozon tabakasının zarar görmesi gibi çevresel sorunlar ortaya çıkmaktadır. Fosil kaynakların sınırlı olması ve kullanımı sonucunda ortaya çıkan zararları önlemek amacı ile çevre dostu yenilenebilir enerji kaynaklarının kullanımı gündeme gelmiştir. Çevre dostu ve yenilenebilir enerji kaynaklarından biri olan biyogaz enerjisi, organik atıklardan elde edilen biyogaz aynı zamanda bu atıkların bertarafı için de önem ve dikkat çekmektedir. Yapılan çalışmada, 2015 ve 2019 yılları için Türkiye İstatistik Kurumu'ndan (TÜİK) alınan veriler ile İç Anadolu Bölgesi biyogaz potansiyeli, biyogazdan elde edilecek olan enerji ve faydalanacak kişi sayısı hesaplanmıştır. Çalışmanın ilk aşamasında İç Anadolu Bölgesi'nde bulunan tüm illerdeki büyükbaş hayvan (BBH), küçükbaş hayvan (KBH) ve kanatlı hayvan (KH) sayıları belirlenmiş, hayvanlardan elde edilen gübre ve enerji miktarları bulunmuştur. 2015 ve 2019 yılları için potansiyel enerji miktarı ve faydalanacak kişi sayısı sırası ile 3410 GWh ve 4275 GWh, 662657 ve 830773 olarak belirlenmiştir.

Due to reasons such as increasing population, global warming and industrialization, existing water resources are rapidly depleting and the need for water is increasing. All over the world, a significant amount of water is used in agricultural areas. The concept of “water footprint” (WF) has come to the fore in recent years for the correct use of water, which has become more important as a result of the rapid depletion of water resources. Water footprint is defined as the amount of water required to produce a product. In this study, water footprints of wheat, barley, sugar beet, and sunflower produced in Sivas province for 2020 were calculated. With WF calculations, more efficient and correct use of water can be achieved, and the water can be used more sustainably by determining how much water the products need and planting according to the current water situation. As a result of the study, sunflower has the highest total WF value of 4147 m3 ton-1and sugar beet has the smallest total WF value with 113 m3 ton-1. Although the total WF values of wheat and barley were greater than the total WF values of sugar beet, the blue WF values were calculated as 0. This means that rainfall waters are sufficient for wheat and barley production.