Phosphorus fractions and its potential release in the sediments of Koycegiz Lake, Turkey

This study was conducted to find out the seasonal and spatial patterns of the phosphorus in the littoral sediment and its potential release into the Koycegiz Lake, south west Turkey, between November 2011 and March 2012 at two months intervals. The scanning electron microscopy was used for elemental compositions of the sediment. The amounts and forms of phosphorus (P) in surface sediments of Koycegiz Lake were examined using a not sequential chemical extraction procedure. Four fractions of sedimentary P, including organic bound phosphorus fraction (Org≈P), calcium bound phosphorus fraction (Ca≈P), iron+aluminium bound phosphorus fraction (Fe+Al≈P) and carbonate bound phosphorus fraction (CO3≈P) were separately quantified. The results indicated that the contents of different phosphorus fractions in the sediments varied greatly. The proportion of phosphorus fractions was estimated as Org≈P (90.20 %), this fraction was followed by Ca≈P) (9.06 %), Fe+Al≈P (0.47 %) and CO3≈P (0.27 %) in this study. The level of phosphorus release from the sediment to the lake is calculated as low. The sediment phosphorus release fluctuated between -6.647–75.883 μg/m2.d-1 and the total phosphorus (TP) concentrations of the sediment samples were changed between 980.39 μg/gDW (Dry Weight) - 1990.81 μg/gDW. The results show that it can be evaluation as eutrophic for Koycegiz Lake

Ammonia-Nitrogen Recovery from Synthetic Solution using Agricultural Waste Fibers

In this study, modification of Empty Fruit Bunch (EFB) fibers as a means to recover ammonianitrogen from a synthetic solution was investigated. Methods: The EFB fiber was modified using sodium hydroxide.Adsorption-desorption studies of ammonia nitrogen into the modified EFB fiber were investigated Findings: Theincrease in adsorption capacity was found to be proportional with the increase of pH up to 7, temperature and ammoniaconcentration. The maximum adsorption capacity is 0.53-10.89 mg/g. The attachment of ammonia nitrogen involves ionexchange-chemisorption. The maximum desorption capacity of 0.0999 mg/g. Applications: This study can be used as abaseline for designing a low cost adsorbent system for ammonia nitrogen recovery drainage and industrial wastewater aswell as EFBs-palm oil mill effluent composting

Boya duyarlaştırıcılı fotovoltaik hücreler için fenazin türevi boya sentezi ve uygulaması

Bu yüksek lisans tezinde boya duyarlaştırıcılı güneş hücrelerinde (DSSC) kullanılmak üzere toplamda üç yeni organik bileşik sentezlenmiştir. DSSC molekülleri elektronu itme-çekme sistemi ile çalışmakta olup sentezlenen bileşiklerin ikisinin dizilimi donör-s köprü materyali (zayıf akseptör)-akseptör ve birinin ise donör-s köprü materyali (zayıf akseptör)-donör şeklindedir. Tüm moleküllerin karakterizasyonları için 1H NMR, 13C NMR, döngüsel voltammetri (CV) ve kızıl-ötesi spektrofotometresi (IR) kullanılmıştır. Sentezlenen moleküller; N,N'-[(11,12-dibutoksi-1,4,5,8-tetrahidrodibenzo [a,c] fenazin-2,7-diil) bis (4,1-fenilen)] bis{4-(hekziloksi)-N-[4-(hekziloksi)fenil] anilin (KD-130B), 3-{4-[7-(4-{bis [4-(hekzil) fenil] amino}fenil)-11,12-dibutoksi-1,4,5,8-tetrahidrodibenzo [a,c] fenazin-2-il] fenil}-2-siyanoakrilik asit (KD-148) ve 3-{5-[7-(4-{bis [4-(hekziloksi) fenil] amino} fenil)-11,12-dibutoksi-1,4,5,8-tetrahidrodibenzo [a,c] fenazin-2-il] -2-tienil} -2-siyanoakrilik asit (KD-150)' dir. DSSC aygıtları FTO/TiO2 /Organik Boya/Redoks Çifti/Pt-FTO dizilimine göre hazırlanmıştır. Cihazların, akım-voltaj (I-V) ve kuantum verimi (IPCE=EQE) karakterizasyonları yapılarak fotovoltaik performans parametreleri incelenmiştir

Removal of Cu (II) from aqueous solutions in a closed recirculating water system using cotton fabrics with nano-sized activated carbon

Региональные экологические проблемы: экологический мониторинг и менеджментWaste water occurring as a result of industrial activities is very dangerous to living organisms because of having highly toxic substances, and heavy metals. Moreover, it contains high amount of copper compounds. Various methods, such as chemical precipitation, ultrafiltration, reverse osmosis, ion exchange, biological processes and adsorption are used to eliminate and remove copper ions inside the waste water. Closed recirculating systems may be developed as an alternative to flow through systems in many industrial activities to remove heavy metals = Сточные воды, возникающие в результате промышленной деятельности, очень опасны для живых организмов из-за наличия высокотоксичных веществ и тяжелых металлов. Кроме того, они содержат большое количество соединений меди. Для устранения и удаления ионов меди внутри сточных вод используются различные методы, такие как химическое осаждение, ультрафильтрация, обратный осмос, ионный обмен, биологические процессы и адсорбция. Замкнутые рециркуляционные системы могут быть разработаны в качестве альтернативы потоку через системы во многих промышленных мероприятиях по удалению тяжелых металло