Sürdürülebilir Kalkınma Amaçları
Yayınlar
- MakaleYalnız künye2024THREE BRYOPHYTE SPECIES NEW TO TURKIYE AND SOUTHWEST ASIA
Batan, Nevzat; Erata, Huseyin; Ezer, Tulay; Alatas, Mevlut
- MakaleAçık Erişim2023Scopus SJRQ3The biosorption of Co(II) by Homalothecium sericeum from aqueous solutions under batch conditions: response surface methodology optimization and Daphnia magna bioassay
Tanyol, Mehtap; Korkmaz, Volkan; Yildirim, Numan; Erguven, Gokhan Onder; Ayhan, Nagihan Karaaslan; Alatas, Mevlut
In the present work, Homalothecium sericeum biomass was used for removal of Co(II) from aqueous solution. The effects of process parameters (contact time, biosorbent amount, and initial Co(II) con-centration) on the response (Co(II) % removal) were investigated using a batch adsorption system optimized with response surface methodology/central composite design method. Under optimized conditions the maximum Co(II) removal efficiency achieved is 94.07% at an initial Co(II) concentration of 2.05 mg/L, a H. sericeum amount of 0.34 g/50 mL, and a process time of 36.09 min. In this study, the toxicity of the medium after biosorption carried out under optimized conditions was also tested with Daphnia magna bioassay. When mortality results with D. magna were evaluated, although a removal efficiency of 94.07% was obtained after biosorption, this was not sufficient to reduce mortality of D. magna.
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İncele - MakaleAçık Erişim2022Scopus SJRQ3Decolorization of Remazol Brilliant Violet 5R and Brilliant Green dyes by Hypnum cupressiforme using response surface methodology-central composite design methodology: toxicity assessment studies by Daphnia magna
Korkmaz, Volkan; Erguven, Gokhan Onder; Tanyol, Mehtap; Alatas, Mevlut; Yildirim, Numan
This study is the first report that aims to optimize the removal of Remazol Brilliant Violet 5R (RBV 5R) and Brilliant Green (BG) from synthetic solutions using Hypnum cupressiforme samples from Abant Mountains of Bolu (Turkey) as biosorbent and to conduct toxicity evaluation studies of treated wastewater using Daphnia magna. Optimization was performed using central composite design under response surface methodology with the operational factors of dye concentration, H. cupressiforme dose, and process time. The optimal conditions for dye concentration, H. cupres-siforme dose, and process time obtained by the numerical analysis were 19.02 mg/L, 0.18 g/50 mL and 110.59 min for RBV 5R, while these values were 18.57 mg/L, 0.18 g/50 mL and 99.45 min for BG, respectively. At the optimum values, maximum RBV 5R and BG removal were achieved as 99.39% and 99.22%, respectively. The D. magna mortality rates showed that treatment with adsorption were sufficient to remove the complete toxicity of dyes especially for RBV 5R.
AtıfScopus2WoS2OpenAlex2İncele - MakaleYalnız künye2021FATTY ACID CONTENT AND FREE RADICAL SCAVENGING (DPPH) ACTIVITIES OF SOME OF BRYOPHYTES EXTRACTS
Aydinl, Sevinc; Alatas, Mevlut; Batan, Nevzat
In this study, DPPH and fatty acid contents were investigated of some taxa belonging to Neckeraceae (Alleniella complanata, Alleniella besseri, Exsertotheca crispa) and Hypnaceae (Hypnum cupressiforme, Hypnum resupinatum, Hypnum andoi) family collected from Kamilet Valley (Artvin-Arhavi) in 2017. DPPH free radical scavenging activity was determined according to the method developed by Brand-Williams et al. The fatty acids in extracts were analyzed via gas chromatography after transforming them into methyl esters. According to the obtained results, it was determined that the DPPH scavenging effects of taxa from Hypnaceae family were significantly higher than those of taxa from Neckeraceae family, and that the free radical scavenging effects of taxa from Hypnaceae family varied depending on the amount of extract. The saturated fatty acids content of the Neckeraceae and the unsaturated fatty acids of the Hypnaceae were found to be richer (p<0.001). The high DPPH activity in our study, especially in Hypnum species, suggested that Hypnum species were richer in terms of phenolic content. These compounds can be used in the pharmaceutical, cosmetic and food sectors, if both of these species are phenolic and fatty acid content can be obtained as pure.
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