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Removal of heavy metals from aqueous solution by sawdust adsorption

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Journal of Environmental Sciences 2007年第2期19卷 160-166页

作者： bulut Yasemin TEZ Zeki Faculty of Arts and Sciences Department of Chemistry University of Dicle21280 DiyarbakirTurkey. Faculty of Techniqual Education Department of Textile Marmara UniversityGztepeIstanbulTurkey

The adsorption of lead, cadmium and nicel from aqueous solution by sawdust of walnut was investigated. The effect of contact time, initial metal ion concentration and temperature on metal ions removal has been studied. The equilibrium time was found to be of the order of 60 min. Kinetics fit pseudo first-order, second-order and intraparticle diffusion models, hence adsorption rate constants were calculated. The adsorption data of metal ions at temperatures of 25, 45 and 60~C have been described by the Freundlich and Langmuir isotherm models. The thermodynamic parameters such as energy, entropy and enthalpy changes for the adsorption of heavy metal ions have also been computed and discussed. Ion exchange is probably one of the major adsorption mechanisms for binding divalent metal ions to the walnut sawdust. The selectivity order of the adsorbent is Pb（I1）~Cd（II）〉Ni（I1）. From these results, it can be concluded that the sawdust of walnut could be a good adsorbent for the metal ions from aqueous solutions.

关键词： adsorption heavy metals sawdust kinetic thermodynamic parameters

A novel indicator system for catalytic spectrophotometric determination and speciation of inorganic selenium species (Se(Ⅳ), Se(Ⅵ)) at trace levels in natural lake and river water samples

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Rare Metals 2011年第5期30卷 477-487页

作者： Ramazan gürkan Halil brahim Ulusoy Mehmet Akay Pinar bulut Department of Chemistry Faculty of Science University of Cumhuriyet

A novel catalytic kinetic method is proposed for the determination of Se（Ⅳ）, Se（Ⅵ）, and total inorganic selenium in water based on the catalytic effect of Se（Ⅳ） on the reduction of Celestine blue by sodium sulfide at pH 7.0 phosphate buffer. The fixed-time method was adopted for the determination and speciation of inorganic selenium. Under the optimum conditions, the two calibration graphs are linear with a good correlation coefficient in the range 2-20 and 20-200 μg·L-1 of Se（Ⅳ） for the fixed-time method at 30℃. The experimental and theo- retical detection limits of the developed kinetic method were found to be 0.21 and 2.50 μg·L-1 for the fixed-time method （3 min）. All of the variables that affect the sensitivity at 645 nm were investigated, and the optimum conditions were established. The interference effect of various cations and anions on the Se（Ⅳ） determination was also studied. The selectivity of the selenium determination was greatly improved with the use of the strongly cation exchange resin such as Amberlite IR120 plus as long as chelating agents of thiourea and thiosulphate. The proposed kinetic method was validated statistically and through recovery studies in natural water samples. The relative standard deviations （RSDs） for ten replicate measurements of 2, 10, and 20 μg·L-1 of Se（Ⅳ） change between 0.35% and 5.58%, while the RSDs for ten replicate measurements of 3, 6, and 12 μg·L-1 of Se（Ⅵ） change between 0.49% and 1.61%. Analyses of a certified standard reference material （NIST SRM 1643e） for selenium using the fixed-time method showed that the proposed kinetic method has good accuracy. The Se（Ⅳ）, Se（Ⅵ）, and total inorganic selenium in lake and river water samples have been successfully determined by this method after selective reduction of Se（Ⅵ） to Se（Ⅳ）.

关键词： selenium speciation Celestine blue catalytic effect kinetic spectrophotometry natural waters

The First Multiband Photometric Light Curve Solutions of the V gru Binary System from the Southern Hemisphere

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Research in Astronomy and Astrophysics 2023年第5期23卷 44-51页

作者： Mehmet Tanriver Atila Poro Ahmet bulut Ahmet Keskin Mark g.Blackford Department of Astronomy and Space Science Faculty of ScienceUniversity of ErciyesTR-38039KayseriTürkiye Erciyes University Astronomy and Space Science Observatory Application and Research CenterTR-38039KayseriTürkiye Astronomy Department of the Raderon AI Lab. BC.BurnabyCanada Department of Physics Faculty of ScienceCanakkale Onsekiz Mart UniversityTerzioğlu KampüsüTR-17020CanakkaleTürkiye Astrophysics Research Center and Ulupmar Observatory Çanakkale Onsekiz Mart UniversityTR-17020ÇanakkaleTürkiye Variable Stars South(VSS) Congarinni ObservatoryCongarinniNSW2447Australia

The first multiband photometric solutions of the short-period V gru eclipsing binary from the southern hemisphere are presented in this *** curves of the system were observed through BVI filters at the Congarinni Observatory in Australia for 15 *** addition to the new ground-based data,we also used the TESS observations in two *** analyzed the light curves of the system using the PHysics Of Eclipsing BinariEs(PHOEBE)2.4.7 version code to achieve the best accordance with the photometric *** solutions suggest that V gru is a near-contact binary system with q=1.302(81)mass ratio,f_(1)=0.010(23),f_(2)=-0.0.009(21),and i=73.45(38).We considered the two hot spots on the hotter and cooler components for the light curve *** extracted the minima times from the light curves based on the Markov Chain Monte Carlo(MCMC)*** our new light curves,TESS,and additional literature minima,we computed the ephemeris of V *** system’s eclipse timing variation trend was determined using the MCMC *** system is a good and challenging case for future studies.

关键词： (stars)binaries eclipsing-techniques photometric-stars individual(V gru)

Towards efficient near-infrared fluorescent organic light-emitting diodes

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Light(Science & Applications) 2021年第2期10卷 166-175页

作者： Alessandro Minotto Ibrahim bulut Alexandras g.Rapidis giuseppe Carnicella Maddalena Patrini Eugenio Lunedei Harry L.Andersonand Franco Cacialli Department of Physics and Astronomy and London Centre for Nanotechnology University College LondonLondon WC1E 6BTUK Department of Chemistry Chemistry Research LaboratoryUniversity of OxfordMansfield RoadOxford OX13TAUK Dipartimento di Fisica University degli Studi di PaviaVia A.Bassi6Pavia 27100Italy. CNR-ISMN Istituto per lo Studio dei Materiali NanostrutturatiConsiglio Nazionale delle RicercheVia P Gobetti 101Bologna 40129Italy

The energy gap law(E_(g)-law)and aggregation quenching are the main limitations to overcome in the design of near-infrared(NIR)organic ***,we achieve unprecedented results by synergistically addressing both of these ***,we propose porphyrin oligomers with increasing length to attenuate the effects of the E_(g)-law by suppressing the non-radiative rate growth,and to increase the radiative rate via enhancement of the oscillator ***,we design side chains to suppress aggregation *** find that the logarithmic rate of variation in the non-radiative rate vs.E_(g)is suppressed by an order of magnitude with respect to previous studies,and we complement this breakthrough by demonstrating organic light-emitting diodes with an average external quantum efficiency of-1.1%,which is very promising for a heavy-metal-free 850 nm *** also present a novel quantitative model of the internal quantum efficiency for active layers supporting triplet-to-singlet *** results provide a general strategy for designing high-luminance NIR emitters.

关键词： radiative limitations aggregation

The conditional mitochondrial protein complexome in the Arabidopsis thaliana root and shoot

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Plant Communications 2023年第5期4卷 172-190页

作者： Youjun Zhang Silvia Martinez Jaime Mustafa bulut Alexander graf Alisdair R.Fernie Center of Plant Systems Biology and Biotechnology 4000 PlovdivBulgaria Max-Planck-Institut f€ur Molekulare Pflanzenphysiologie Am Muhlenberg 114476 Potsdam-GolmGermany

Protein complexes are important for almost all biological ***,to fully understand how cells work,it is also necessary to characterize protein complexes and their dynamics in response to various cellular ***,the dynamics of protein interaction play crucial roles in regulating the(dis)association of protein complexes and,in turn,regulating biological processes such as ***,mitochondrial protein complexes were investigated by blue native PAgE and size-exclusion chromatography under conditions of oxidative stress in order to monitor their dynamic(dis)*** of enzyme interactions and changes in protein complex abundance were observed in response to oxidative stress induced by menadione *** included changes in enzymatic protein complexes involving g-amino butyric acid transaminase(gABA-T),D-ornithine aminotransferase(D-OAT),or proline dehydrogenase 1(POX1)that are expected to affect proline *** treatment also affected interactions between several enzymes of the tricarboxylic acid(TCA)cycle and the abundance of complexes of the oxidative phosphorylation *** addition,we compared the mitochondrial complexes of roots and *** differences between the two tissues were observed in the mitochondrial import/export apparatus,the formation of super-complexes in the oxidative phosphorylation pathway,and specific interactions between enzymes of the TCA cycle that we postulate may be related to the metabolic/energetic requirements of roots and shoots.

关键词： mitochondrial complexes BN-PAgE size-exclusion chromatography TCA cycle

Effect of sodium tungstate on visual evoked potentials in diabetic rats

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International Journal of Ophthalmology(English edition) 2016年第5期9卷 677-681页

作者： Mehmet bulut Bariszgür Dnmez Nihai ztürk gksum Basaranlar Ceren Kencebay Manas Narin Derin Semir zdemir Department of Ophthalmology Antalya Education and Research Hospital Department of Nutrition and Dietetics School of HealthAkdeniz University Department of Biophysics Faculty of MedicineAkdeniz University

AIM： To evaluate the effect of sodium tungstate on visual evoked potentials（VEPs） in diabetic rats.· METHODS： Wistar rats were randomly divided into three groups as normal control, diabetic control and diabetic rats treated with sodium tungstate. Diabetes was induced by single intraperitoneal injection of streptozotocin（50 mg/kg）. Sodium tungstate [40 mg/（kg·d）]was administered for 12 wk and then VEPs were ***, thiobarbituric acid reactive substance（TBARS） levels were measured in brain tissues.·RESULTS： The latencies of P1, N1, P2, N2 and P3 waves were significantly prolonged in diabetic rats compared with control group. Diabetes mellitus caused an increase in the lipid peroxidation process that was accompanied by changes in VEPs. However, prolonged latencies of VEPs for all components returned to control levels in sodium tungstate-treated group. The treatment of sodium tungstate significantly decreased brain TBARS levels and depleted the prolonged latencies of VEP components compared with diabetic control group.· CONCLUSION： Sodium tungstate shows protective effects on visual pathway in diabetic rats, and it can be worthy of further study for potential use.

关键词： diabetes retinopathy sodium tungstate visual evoked potentials lipid peroxidation

New solitary wave structures to the(3+1)dimensional Kadomtsev-Petviashvili and Schrödinger equation

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Journal of Ocean Engineering and Science 2019年第4期4卷 373-378页

作者： Hasan bulut Emine Nesligül Aksan MiraçKayhan Tukur Abdulkadir Sulaıman Department of Mathematics University of FıratElazıgTurkey Department of Mathematics University of InonuMalatyaTurkey Department of Mathematics Federal University DutseJigawaNigeria

The studies of the dynamic behaviors of nonlinear models arising in ocean engineering play a significant role in our daily *** this paper,an efficient mathematical technique,namely;the sine-gordon expansion method is employed to construct the traveling wave solutions to the(3+1)-dimensional Kadomtsev-Petviashvili and(3+1)-dimensional nonlinear Schrödinger *** suitable values of the parameters,the two-and three-dimensional figures of the obtained solutions are plotted.

关键词： Sine-gordon expansion method Kadomtsev-Petviashvili equation Schrödinger equation wave solutions

Six high-intensity interval training sessions over 5 days increases maximal oxygen uptake,endurance capacity,and sub-maximal exercise fat oxidation as much as 6 high-intensity interval training sessions over 2 weeks

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Journal of Sport and Health Science 2021年第4期10卷 478-487页

作者： Muhammed M.Atakan Yasemin guzel Suleyman bulut Sukran N.Kosar glenn K.McConell Huseyin H.Turnagol Division of Nutrition and Metabolism in Exercise Faculty of Sport SciencesHacettepe UniversityAnkara 06690Turkey Institute for Health and Sport Victoria UniversityMelbourneVIA 3011Australia

Background:High-intensity interval training(HIIT)induces similar or even superior adaptations compared to continuous endurance ***,just 6 HIIT sessions over 2 weeks significantly improves maximal oxygen uptake(VO_(2max)),submaximal exercise fat oxidation,and endurance *** even faster adaptations can be achieved with HIIT is not ***,we aimed to determine whether 2 sessions of HIIT per day,separated by 3 h,every other day for 5 days(double HIIT(HIIT-D),n=15)could increase VO_(2max),submaximal exercise fat oxidation,and endurance capacity as effectively as 6 sessions of HIIT over 2 weeks(single HIIT(HIIT-S),n=13).Methods:Each training session consisted of 10×60 s of cycling at 100%of VO_(2max)interspersed with 75 s of low-intensity cycling at 60 watt(W).Pre-and post-training assessments included VO_(2max),time to exhaustion at-80%of VO_(2max),and 60-min cycling trials at-67%of VO_(2max).Results:Similar increases(p0.05)and endurance capacity(HIIT-D:80.1%***-S:79.2%,p>0.05)were *** exercise carbohydrate oxidation was reduced in the 2 groups after exercise training(HIIT-D:9.2%,p=0.014 ***-S:18.8%,p=0.012)while submaximal exercise fat oxidation was significantly increased in HIIT-D(15.5%,p=0.048)but not in HIIT-S(9.3%,p=0.290).Conclusion:Six HIIT sessions over 5 days was as effective in increasing VO_(2max)and endurance capacity and was more effective in improving submaximal exercise fat oxidation than 6 HIIT sessions over 2 weeks.

关键词： Double interval training Exercise metabolism Performance Substrate oxidation

Determination of Some Trace Metals in Environmental Samples by Flame AAS Following Solid Phase Extraction with Amberlite XAD-2000 Resin after Complexing with 8-Hydroxyquinoline

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Chinese Journal of Chemistry 2007年第2期25卷 196-202页

作者： DURAN, Celal SENTURK, H. Basri gUNDOgDU, Ali bulut, V. Numan EICi, Latif SOYLAK, Mustafa TUFEKCI, Mehmet UYgUR, Yaprak Department of Chemistry Faculty of Arts & Sciences Karadeniz Technical University 61080 Trabzon Turkey Department of Chemistry Giresun Faculty of Arts & Sciences Karadeniz Technical University 28049 Giresun Turkey Department of Chemistry Faculty of Arts & Sciences Pamukkale University 20020 Denizli Turkey Department of Chemistry Faculty of Arts & Sciences Erciyes University 38039 Kayseri Turkey

A procedure for preconcentration of Mn（Ⅱ）, Fe（Ⅱ）, Co（H）, Cu（Ⅱ）, Cd（Ⅱ）, Zn（Ⅱ）, Pb（Ⅱ） and Ni（Ⅱ） based on retention of their complexes with 8-hydroxyquinoline （HQ） on Amberlite XAD-2000 resin in a column was proposed for the analysis of environmental samples by flame AAS. Various parameters such as pH, eluent type, volume, concentration, flow rate and volume of sample solution, and matrix interference effect on the retention of the metal ions were investigated. The optimum pHs for the retention of metal complexes in question were about 6 except for Mn^2＋ for whose value is 8. The loading capacity of the adsorbent for these metals and their recoveries from the resin under the optimum conditions were in the range 6.82-9.26 mg·g^-1 and 95%-101%, respectively. The enrichment factor was calculated as 100 and the limit of detection was in the range 0.3-2.2 μg·L^-1 （n=20, blank＋ 3s）. The proposed enrichment method was applied to tap water, stream water and vegetable samples. The validation of the procedure was carried out by analysis of certified reference material and standard addition. The analytes were determined with a relative standard deviation lower than 6% in all samples.

关键词： water and vegetable sample trace metal preconcentration amberlite XAD-2000 FAAS 8-hydroxyquinoline