Scopus İndeksli Yayınlar Koleksiyonu / Scopus Indexed Publications Collection
Permanent URI for this collectionhttps://hdl.handle.net/11147/7148
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Article Citation - WoS: 25Citation - Scopus: 26Phosphorylated Hazelnut Shell Waste for Sustainable Lithium Recovery Application as Biosorbent(Springer, 2021) Recepoğlu, Yaşar Kemal; Yüksel, AslıHazelnut shell waste was phosphorylated to develop a novel biosorbent based on natural renewable resource for the recovery of lithium from aqueous solution. For the synthesized biosorbent, the surface morphology and mapping by SEM-EDS, chemical properties by FTIR, elemental analysis by XPS, specific surface area by BET, crystallinity by XRD and thermal properties by TGA were elucidated elaborately. The influence of biosorbent dosage, initial concentration, temperature, contact time, pH and coexisting ions were investigated. The equilibrium sorption capacity reached 6.03 mg/g under optimal conditions (i.e., biosorbent dosage of 12.0 g/L, initial Li concentration of 100 mg/L, pH value of 5.8, sorption temperature of 25 degrees C, and sorption time of 6 min). According to the sorption behavior of the phosphorylated hazelnut shell waste the Freundlich model proved to be more suitable than the Langmuir model indicating maximum sorption capacity as 7.71 mg/g at 25 degrees C. Thermodynamic parameters obtained by different isokinetic temperatures disclosed that the ion exchange reaction was feasible, spontaneous, and exothermic where the interaction between biosorbent surface and solvent plays an important role. A preliminary test on the Li recovery from geothermal water was also performed to check its applicability in a real brine. Desorption studies at 25 degrees C revealed that relatively higher desorption efficiency and capacity were achieved at 97.4% and 5.93 mg/g, respectively with a 1.0 M H2SO4 among other regenerants (i.e., HCl and NaCl). Concentrations of Li and the other cations were determined via ICP-OES. Due to such outstanding features, the novel phosphorylated hazelnut shell waste had great potential for lithium recovery from aqueous solution by being added value as a waste and recovering a strategic element of modern life simultaneously. [GRAPHICS] .Article Citation - WoS: 9Citation - Scopus: 9Rapid Identification of Phosphorus Containing Proteins in Electrophoresis Gel Spots by Laser-Induced Breakdown Spectroscopy, Libs(Royal Society of Chemistry, 2014) Aras, Nadir; Yalçın, ŞerifeA novel method for the rapid in-gel identification of phosphorus containing proteins, specifically casein and ovalbumin, prior to mass spectrometric analysis for the elucidation of phosphorylation sites was developed. After polyacrylamide gel-electrophoretic separation, staining and drying, protein bands were subjected to focused laser pulses at the center or the vicinity of the protein band. Phosphorus containing proteins were recognized from their prominent phosphorus lines in the luminous plasma formed by energetic laser pulses. The LIBS emission intensity of phosphorus lines at 253.5 nm and 255.3 nm has been optimized with respect to laser energy and detector timing parameters by using pure casein in the pellet form. The method was applied to casein, ovalbumin, two commercially available standard protein mixtures and proteins extracted from the canola plant. It was shown that LIBS was capable of identifying phosphorus containing proteins directly in the gel matrix in nanogram amounts. Mass spectrometric analysis of the ovalbumin spot after the in-gel digestion procedure has proved the accuracy of the technique. With the speed and spatial resolution that LIBS offers, this technique shows promise in the micro-local spotting of phosphorus containing proteins in the polyacrylamide gel matrix prior to MS analysis for the determination of the phosphorylation sites. © 2014 The Royal Society of Chemistry.