DSpace Arşivi :: by Yazar "Beduk, Fatma" değerine göre listeleniyor

Yazar "Beduk, Fatma" seçeneğine göre listele

Listeleniyor 1 - 17 / 17

Accumulation of Micropollutants in Aqueous Media and Sediment, A Risk Assessment for Konya Main Drainage Channel, Turkey
(Springer International Publishing Ag, 2019) Aydin, Mehmet Emin; Aydin, Senar; Beduk, Fatma; Ulvi, Arzu; Bahadir, Mufit
Human activities increase types and numbers of synthetic pollutants and their byproducts in the course of time. Synthetic Organic Chemicals (SOCs), so called micropollutants, present in very low concentrations in aquatic ecosystem, but likely accumulate in animal and human tissues and cells because of fat solubility. These persistent micropollutants have toxic effects in very low concentrations and resistant to biodegradation. SOCs can be adsorbed to sediments in surface water sources, so sediments have an important role in the accumulation of water contaminants. In the course of time, sediments become source of new contamination for aqueous media. In this study, it is aimed to determine concentration of two groups of SOCs; organochlorine pesticides (OCPs) and organophosphorous pesticides (OPPs) in wastewater, surface sediment and excavated sediment samples taken from Konya Main Drainage Channel (MDC) which takes the effluents of Konya Wastewater Treatment Plant and transports the treated wastewater to Salt Lake.
Combined Effects of Cadmium and Azithromycin on Soil Nitrification Process
(Mdpi, 2023) Beduk, Fatma
Heavy metals and pharmaceuticals have polluted agricultural soils mainly through wastewater irrigation, fertilizers, and soil amendment with sewage sludge. This study aims to determine the synergetic toxic effect of Cd and the selected macrolide antibiotic, azithromycin (AZI), on ammonia-oxidizing bacteria (AOB) in soil, via analyzing nitrification inhibition. A short-term acute toxicity test was used to measure the formation of Nitrite (NO2-N) to indicate the nitrification potential of the aerobic nitrosomonas bacteria in the germination period. Potential nitrification rates (PNRs) of five soil samples ranged between 3.782-17.642 mg NO2-N/kg dm PNRs of soil samples positively correlated with organic matter content and neutral pH. PNRs of the tested soils were significantly affected by Cd and AZI contamination, with interactions exhibited for their simultaneous occurrence and soil pH. A significant difference (p < 0.05) was found when soil samples with pH 6.5-pH 8.5 contaminated with environmentally relevant concentrations of Cd (1 mg/kg-21 mg/kg) and AZI (1 mg/kg-9 mg/kg). 50% PNR inhibition after 11 mg/kg Cd and 5 mg/kg AZI contamination was determined for the soil sample at pH 8.5, with 3.782 mg NO2-N/kg dm potential. From these outcomes, it was concluded that there was a risk of the soil nitrification process in case of simultaneous occurrence of Cd and AZI.
Development of biofilm collectors as passive samplers in sewerage systems-a novel wastewater monitoring method
(Springer Heidelberg, 2020) Aydin, Mehmet Emin; Beduk, Fatma; Aydin, Senar; Koyuncu, Serdar; Genuit, Gerhard; Bahadir, Muefit
In this study, a novel wastewater sampling method based on biofilm collection on a multi-armed polyethylene strips (so called Octopus) is proposed. The implementation of this method is a step forward to prevent illegal industrial discharges into sewerage systems and receiving water bodies. Prior applications of biofilm collection were performed in Bielefeld, Germany, in 1994. The success of the method encouraged other municipalities to apply this method for monitoring indirect discharges into sewerage systems. Municipality of Konya, Turkey, started to use the method in 2013. Continuous monitoring has been performed for the determination of regulated heavy metals: chromium (Cr), copper (Cu), zinc (Zn), nickel (Ni), lead (Pb), mercury (Hg) and cadmium (Cd). Unauthorized discharges of Cr, Zn and Ni were identified in Konya by performing sewerage slime tests through biofilm analyses. 2686 mg/kg d.m. Cr, 3949 mg/kg d.m. Zn and 3300 mg/kg d.m. Ni were highest values determined for biofilm samples taken from monitoring sites. In this paper, the principles of the method will be introduced, and findings from the wastewater of Konya City will be given in comparison with findings from Bielefeld, Germany. Conducted results reveal high (and likely illegal) heavy metal discharges into the sewerage system in Konya. The continuous monitoring of sewerage systems with biofilm collectors is an effective and efficient method for point source control of wastewater pollutants.
Effects of long-term irrigation with untreated municipal wastewater on soil properties and crop quality
(Springer Heidelberg, 2015) Aydin, Mehmet Emin; Aydin, Senar; Beduk, Fatma; Tor, Ali; Tekinay, Arzu; Kolb, Marit; Bahadir, Muefit
Irrigating crops with untreated wastewater leads to elevated concentrations of heavy metals both in soil and cultivated crops. The current study was designed to determine heavy metal (i.e., Pb, Cd, Cr, Cu, Ni, Zn, Hg) accumulation in Konya soils in selected nine sites irrigated with wastewater for over 40 years. Non-irrigated soil samples and soil samples irrigated with well water were taken as control samples. Transport of these pollutants to the wheat samples cultivated in the investigated site was also examined. The obtained results reveal that high alkaline properties and clay structure of Konya soil reduce the mobility of contaminants and cause accumulation in the top layer of soil. Intense effect of wastewater irrigation on soil EC was determined. The highest concentrations of Pb, Cr, Cu, Cd, Zn, Ni, and Hg in wastewater irrigated soil were 5.32, 37.1, 31.5, 11.4, 91.5, 134, and 0.34 mg kg(-1), respectively. Wastewater irrigated soils were strongly polluted by means of Cd (8.23-11.6 mg kg(-1)) and moderately to strongly polluted by means of Ni (47.7-134 mg kg(-1)), exceeding Maximum Admissible Concentrations for Trace Elements in Agricultural Soils and Sewage Sludge Regulation limit values of Turkey. Maximum concentrations found for Pb, Cr, Cu, Cd, Zn, and Ni in wastewater irrigated wheat grain were 8.44, 1.30, 9.10, n.d, 29.31, and 0.94 mg kg(-1), respectively. Besides, Hg was not detected in any samples of wheat grain. Based on the regulation of Turkish Food Codex, Pb contamination in wheat samples grown in the sampling site was evidenced.
Levels of Organochlorine Pesticides and Heavy Metals in Surface Waters of Konya Closed Basin, Turkey
(Hindawi Ltd, 2013) Aydin, Mehmet Emin; Ozcan, Senar; Beduk, Fatma; Tor, Ali
The concentrations of organochlorine pesticides (OCPs), including alpha-, beta-, gamma-, and delta-hexachlorocyclohexane (HCH), heptachlor, heptachlor epoxide, dieldrin, aldrin, endrin, endrin aldehyde, endrin ketone, endosulfan I, endosulfan II, endosulfan sulfate, p,p'-DDE, p,p'-DDD, p,p'-DDT, methoxychlor, chlordane I, chlordane II, and heavy metals, such as As, Cr, Cu, Fe, Mn, and Ni in surface water samples from the Konya closed basin were determined to evaluate the level of contamination. Among all HCH isomers, beta-HCH is the main isomer with a concentration range of 0.015-0.065 mu g/L. DDE, DDD, and DDT were almost determined in all samples, in which DDE isomer had the highest concentration ranged from not detected to 0.037 mu g/L. In all studied OCPs, aldrin showed the highest concentration at 0.220 mu g/L. The concentrations of heavy metals in water samples were observed with order: Mn < Cu < Ni < As < Cr < Fe. In some samples, As, Fe, and Cr concentrations exceeded the drinking water quality recommended by EU, US EPA, WHO, and Turkish Regulation, while Cu, Ni, and Mn concentrations are below the guideline values. The levels of both OCPs and heavy metals were also compared with other previously published data.
ORGANOCHLORINE PESTICIDES IN HUMAN MILK SAMPLES
(Health & Environment Assoc, 2016) Aydin, Senar; Aydin, Mehmet Emin; Beduk, Fatma
This study aims to determine levels of Organochlorine Pesticides (OCPs) contamination in human milk. Human milk samples were taken from 45 healthy mothers living in the Konya area for at least 5 years. General demographic characteristics of mothers were determined in the means of age, diet, smoking habit, occupational exposure etc. Sample extraction was performed by vortex and cleaned up by column chromatography. OCPs (alpha-, beta-, gamma- and dhexachlorocyclohexane (HCH), heptachlor, heptachlor epoxide, dieldrin, aldrin, endrin, endrin aldehyde, endrin ketone, endosulfan I, endosulfan II, endosulfan sulfate, p, p'-DDE, p, p'-DDD, p, p'-DDT, methoxychlor, chlordane I, chlordane II) analyses of the extracts were carried out using gas chromatography micro electron capture detector (GC/mu-ECD, Agilent 6890N, Agilent Technologies, CA, USA). Recovery ratios were between 70+/-5 % and 109+/-5%. The mean age of mothers was 28.2. The lipid content of the milk samples was ranged from 0.43 to 6.47% (average 2.20%). Mean total OCPs concentration was determined as 371.2+/-34.57 ng/g lipid. Dieldrin was determined in highest concentration (155.35+/-406 ng/g lipid). Total mean HCH (alpha, beta, gamma, delta), DDT (p, p-DDE, p, p-DDD, p, p-DDT), heptachlor (heptachlor, heptachlor epoxide), endosulfan (endosulfan I, endosulfan II, endosulfan sulfate), endrin (endrin, endrin aldehyde, endrin ketone) were determined 42.45, 37.13, 14.54, 37.13 and 62.49 ng/g lipid, respectively. OCPs concentrations determined in this work were below the values reported in similar works carried out in Turkey and in the World.
Organohalogenated pollutants in raw and UHT cow's milk from Turkey: a risk assessment of dietary intake
(Springer Heidelberg, 2019) Aydin, Senar; Aydin, Mehmet Emin; Beduk, Fatma; Ulvi, Arzu
In this study, health risk of human exposure to organohalogenated pollutants (OHPs) through milk consumption was determined. Conventionally produced, unprocessed cow's milk samples taken from Konya District, in Turkey, and 15 different brand ultra-high-temperature (UHT) processed cow's milk samples taken from supermarkets of Turkey were analyzed for organochlorine pesticides (OCPs, -, -, -, and -HCHs, p,p'-DDE, p,p'-DDD, and p,p'-DDT, heptachlor, heptachlor epoxide, endosulfan I, endosulfan II, endosulfan sulfate, endrin, endrin aldehyde, endrin ketone, aldrin + dieldrin, methoxychlor), polychlorinated biphenyls (PCBs, PCB 28, 52, 101, 153, 138, and 180), and polybrominated diphenyl ethers (PBDEs, PBDE 47, 99, 100, 153, and 154 congeners). Estimated daily intake (EDI) values calculated for both adults and children consuming raw or UHT milk were determined to exceed maximum residue limits (MRLs) set for -HCH, Sigma Heptachlor, and endrin. EDI values also exceeded admissible daily intake (ADI) values given for Sigma HCH, Sigma Heptachlor, Sigma Endrin aldrin + dieldrin, and Sigma PCBs. p,p'-DDT/p,p'-DDE ratio was 1 or higher for 66% of the milk samples, which is an indication of sustaining illegal use of DDT. A health risk is determined for dietary intake of OHPs via consumption of milk.
Persistent Organic Pollutants in Sewage Sludge: Occurrence, Temporal Concentration Variation and Risk Assessment for Sewage Sludge Amended Soils
(Korean Society Of Civil Engineers-Ksce, 2023) Beduk, Fatma; Aydin, Senar; Ulvi, Arzu; Aydin, Mehmet Emin
In this study, the occurrences, temporal concentration variations and ecotoxicological risks were determined for 18 polycyclic aromatic hydrocarbons (PAHs); 7 congeners of polychlorinated biphenyls (PCBs), and 18 selected organochlorine pesticides (OCPs) in the anaerobically digested sewage sludge samples obtained from a conventional wastewater treatment plant (WWTP) in Konya, Turkey. Flowrate of the evaluated WWTP was 200,000 m(3)/day, with the production of 140 tons/day treated sewage sludge. Total 18 PAHs were in the range of 1,203 - 17,599 & mu;g/kg of dry matter (dm); total PCBs were in the range of 51.26 - 561.37 & mu;g/kg dm, and total OCPs were in the range of 4.90 - 13.11 & mu;g/kg dm. The highest concentrations were determined for fluoranthene among PAHs, with 2445 & mu;g/kg dm, PCB118 congener with 514 & mu;g/kg dm, and & delta;-HCH among OCPs with 2.44 & mu;g/kg dm. Considering the average daily production amounts of treated sludge, the highest mass loads were 1,785 g/day for total PAHs; 79 g/day for total PCBs; and 1 - 2 g/day for total OCPs, while the annual mass load was estimated to be approximately 7.3 kg. An ecotoxicological risk assessment was performed by estimation of risk quotients (RQs). High risk for soil ecosystem was identified due to PAHs and PCBs ingredient of sludge, while lower risk was determined for OCPs compounds. The highest RQ values were determined for pyrene (RQ: 1337) among PAHs, PCB118 congener (RQ: 7608), and & gamma;-HCH (RQ: 5.23) among OCPs. Findings of this study show that sewage sludge can be an important source in the spread of persistent pollutants to the environment, and may pose a risk for soil ecosystem.
PESTICIDE POLLUTION IN SOIL AND WHEAT: RISK ASSESSMENT OF CONTAMINATED FOOD CONSUMPTION
(Parlar Scientific Publications (P S P), 2017) Beduk, Fatma; Aydin, Mehmet Emin; Aydin, Senar; Tekinay, Arzu; Bahadir, Mufit
In this study, organochlorine pesticides (OCPs) and organophosphorus pesticides (OPPs) contamination of wheat cultivated in Konya region and soils of this region were determined. Health risk caused by the consumption of pesticide contaminated wheat was assessed. Totally, 30 soil samples and 21 wheat samples taken from the field and trade center were analyzed for OCPs (alpha-HCH, beta-HCH, gamma-HCH, delta-HCH, aldrin, dieldrin, heptachlor, heptachlor epoxide, endosulfan I, endosulfan II, endosulfan sulfate, p,p'-DDE, p,p'-DDD, p,p'-DDT, endrin, endrin aldehyde, endrin ketone, methoxychlor) and OPPs (malathion, parathion, methyl-parathion, chlorpyrifos, diazinon). Determinations of OCPs and OPPs were carried out with a GC/MSD (GC, Agilent 6890 N, MSD, Agilent 5973). Maximum concentrations of OCPs in soil samples were found for Sigma HCHs (alpha-HCH, beta-HCH, gamma-HCH, delta-HCH) and Sigma endosulfan (endosulfan I, endosulfan II, endosulfan sulfate) in the range of 8.74 - 71.8 ng g(-1) and 1.99 - 112 ng g(-1), respectively. Malathion and chlorpyrifos were the predominant OPPs in soil and wheat samples. Maximum concentrations of malathion and chlorpyrifos in soil samples were 222 ng g(-1) and 556 ng g(-1), respectively. Maximum total OCPs and total OPPs in the grain were 2.32 mu g g(-1) and 15.4 mu g g(-1), respectively. Sigma DDT was found in the range of 20 60 ng g(-1) in grain samples. Trade center samples exceeded maximum residue limits (MRL) of Turkish Food Codex (TFC) given for beta-HCH, gamma-HCH, Sigma HCH, dieldrin and chlorpyrifos, and field samples exceeded MRL given for a-HCH, beta-HCH, Sigma HCH, Sigma endosulfan, Sigma heptachlor, and all OPP compounds. There is an acute and chronic consumer health risk due to the consumption of pesticide contaminated wheat, on the basis of aHI and HQ calculation. Besides, prohibited pesticides are obviously still being used in the area.
Pharmaceutical residues in digested sewage sludge: Occurrence, seasonal variation and risk assessment for soil
(Elsevier, 2022) Aydin, Senar; Ulvi, Arzu; Beduk, Fatma; Aydin, Mehmet Emin
The occurrences, temporal variations and ecotoxicological risks of 38 selected pharmaceuticals from 7 therapeutic classes (i.e. antibiotics, analgesics, anti-inflammatories, beta-blockers, lipid regulators, anticancer agents, and psychiatric drugs) have been observed in the anaerobically treated sludge of the urban wastewater treatment plant (WWTP) in Konya, Turkey. Sampling was carried out to assess the seasonal variations in one year. The total daily wastewater flow rate of the WWTP was approximately 200,000 m(3)/day, and 140 tons/day of treated sludge were produced. The total concentrations of all pharmaceutical compounds ranged from 280 to 4898 mu g/kg of dry matter (dm). The dominant therapeutic class was analgesics and anti-inflammatories (49%), which was followed by antibiotics (31%). Clarithromycin and azithromycin were the most abundant compounds, with concentrations of 1496 mu g/kg dm. The total daily pharmaceutical load in the treated sludge was as high as 1.002 kg/day in the winter season, while the annual pharmaceutical mass load that was discharged into the environment was estimated to be approximately 71.6 kg. The use of treated sludge as fertilizer in agricultural lands causes continuous contamination of the terrestrial environment by pharmaceuticals. Five antibiotics (i.e., azithromycin, clarithromycin, erythromycin, sulfamethoxazole, and doxycycline), one analgesic (acetylsalicylic acid) and one beta-blocker (atenolol) in the digested sludge pose acute and short chronic high risks to environment. The highest short chronic risk in the digested sludge amended soils was determined for azithromycin (RQ: 54.9). To reduce the potential environmental impact of pharmaceuticals, digested sludge should be monitored in terms of the pharmaceutical contents before being applied to soil.
Removal of antibiotics from aqueous solution by using magnetic Fe3O4/red mud-nanoparticles
(Elsevier Science Bv, 2019) Aydin, Senar; Aydin, Mehmet Emin; Beduk, Fatma; Ulvi, Arzu
In this study, the availability of magnetically separable Fe3O4-red mud nanoparticles (Fe3O4-RM-NPs) for the removal of antibiotics from wastewater was investigated. Disadvantages of red mud and Fe3O4 because of difficult separation from aqueous media, agglomeration, and iron leaching were overcome by combining these two materials. After examinating adsorption capability of magnetic Fe3O4-RM-NPs for all studied antibiotic compounds, the experiments were performed by using Ciprofloxacin (CIPRO) as a model compound. Batch experiments were performed to determine the effect of red mud content of synthesized Fe3O4-RM-NPs, pH, reaction time and temperature on the proposed method. The surface morphology, magnetic properties, crystalline structure, thermal stability and Brunauer-Emmet-Teller surface area of the synthesized Fe3O4-RM-NPs were determined. The saturation magnetization of Fe 3 0 4 -RM-NPs was determined to be 12.2 emu/g, which is efficient to separate adsorbent from water by using a conventional magnet. For the efficient removal of CIPRO from aqueous media optimum conditions were determined to be 1.5 g red mud for Fe3O4-RNI-NPs synthesize, pH 6.0, reaction time 60 min, 3 g/L Fe3O4-RM-NPs dosage at 25 degrees C. Adsorption was fitted well with pseudo-second-order kinetic model. Equilibrium data were found to be better represented by Freundlich isotherm. n value was 4.32, and K-F value was 110.15 mg/g for Freundlich isotherm. No important matrix effect was determined for removal of CIPRO from wastewater sample. Film diffusion mechanism controlled adsorption. Magnetically separable Fe3O4-RM-NPs are proposed to be used as efficient adsorbent to remove antibiotics from wastewater sources. Since red mud is a process waste, proposed nanomaterial is a good alternative to commercial adsorbents. (C) 2019 Elsevier B.V. All rights reserved.
Removal of lindane from an aqueous solution by using aminopropyl silica gel-immobilized calix[6]arene
(Elsevier Science Bv, 2013) Tor, Ali; Aydin, Mehmet Emin; Aydin, Senar; Tabakci, Mustafa; Beduk, Fatma
An aminopropyl silica gel-immobilized calix[6]arene (C[6]APS) has been used for the removal of lindane from an aqueous solution in batch sorption technique. The C[6]APS was synthesized with p-tert-butylcalix[6]arene hexacarboxylate derivative and aminopropyl silica gel in the presence of N,N'-diisopropyl carbodiimide coupling reagent. The sorption study was carried out as functions of solution pH, contact time, initial lindane concentration, C[6]APS dosage and ionic strength of solution. The matrix effect of natural water samples on the sorption efficiency of C[6]APS was also investigated. Maximum lindane removal was obtained at a wide pH range of 2-8 and sorption equilibrium was achieved in 2 h. The isotherm analysis indicated that the sorption data can be represented by both Langmuir and Freundlich isotherm models. Increasing ionic strength of the solutions increased the sorption efficiency and matrix of natural water samples had no effect on the sorption of lindane. By using multilinear regression model, regression equation was also developed to explain the effects of the experimental variables. (C) 2013 Elsevier B.V. All rights reserved.
Simple and effective removal of psychiatric pharmaceuticals from wastewater treatment plant effluents by magnetite red mud nanoparticles
(Elsevier, 2021) Aydin, Senar; Beduk, Fatma; Ulvi, Arzu; Aydin, Mehmet Emin
Psychological disorders due to the COVID-19 pandemic have increased the consumption of psychiatric pharmaceuticals on a global scale in last year. These compounds reach wastewater treatment plants (WWTP) through sewerage system and are not sufficiently removed by using conventional treatment process. Psychiatric drugs released with WWTP effluent may cause possible risks to the receiving aquatic environment. Also, two antidepressants have been included in the watch list in 2020. Therefore, simple and relatively cost effective removal of psychiatric drugs from wastewaters becomes important. Magnetite red mud nanoparticles (RM-NPs) synthesized was applied for the removal of psychiatric drugs (fluoxetine, paroxetine, carbamazepine, diazepam, and lorazepam) in WWTP effluent first time in this study. The adsorption of carbamazepine as a model compound was fitted well with pseudo-second-order kinetic model. The Freundlich isotherm model better represented the sorption data than the Langmuir model. High adsorption capacity (90.5 mg/g) was reached at 30 min contact time at pH 6.5-7.0 at 25 degrees C. The adsorption rate was described by the pseudo second order model and its rate control mechanism was controlled by film diffusion. The magnetite RM-NPs were efficiently used for the removal of carbamazepine from real WWTP effluents. The adsorption capacity and the magnetic separability of the regenerated magnetite RM-NPs were unaffected five cycles. Due to its simple application, low cost and high adsorption capacity, magnetite RM-NPs can be recommended as a better adsorbent comparing to commercial adsorbents to remove psychiatric drugs from WWTP effluents. (c) 2021 Elsevier B.V. All rights reserved.
Sorption of phenol from aqueous solution by novel magnetic polysulfone microcapsules containing Cyanex 923
(Elsevier, 2012) Ozcan, Senar; Tor, Ali; Aydin, Mehmet Emin; Beduk, Fatma; Akin, Ilker
This paper describes the sorption of phenol from aqueous solution by using novel magnetic polysulfone (PSF) microcapsules containing Fe3O4 nanoparticles and mixture of trialkyl-phosphine oxides (Cyanex 923) (Cyanex 923/Fe3O4@PSF microcapsules). The preparation of the Cyanex 923/Fe3O4@PSF microcapsules was based on the phase-inversion technique. The prepared microcapsules were characterized by using Fourier Transform Infrared Spectroscopy (FT-IR), Thermal Gravimetric Analysis (TGA), Scanning Electron Microscopy (SEM), Energy Dispersive X-ray spectroscopy (EDX) and Vibrating Sample Magnetometer (VSM). Fe3O4 nanoparticles in the microcapsules provided easier separation via application of external magnetic field. The experiments indicated that phenol could be removed from aqueous solution at a pH range between 3 and 9. The Cyanex 923/Fe3O4@PSF microcapsules prepared with dispersed phase containing 3.35% of Cyanex 923 (by wt.) provided the highest removal. The sorption reached an equilibrium in 120 min and it obeyed the pseudo-second order kinetic model. The non-linear Chi-square (chi(2)) statistical test showed that Langmuir isotherm model better represented the sorption data in comparison to Freundlich and Redlich-Peterson models. The Langmuir sorption capacity (Q(o)) and sorption constant (b) were 0.664 mmol/g and 0.855 L/mmol, respectively. The regenerated microcapsules could be used five times with no change in their sorption capacity and magnetic separability. (C) 2012 Elsevier Ltd. All rights reserved.
Superparamagnetic nanomaterial Fe3O4-TiO2 for the removal of As(V) and As(III) from aqueous solutions
(Taylor & Francis Ltd, 2016) Beduk, Fatma
A magnetically separable nanomaterial Fe3O4-TiO2 was synthesized and characterized which was subsequently used for the removal of arsenic (V) from aqueous solutions. The surface morphology, magnetic properties, crystalline structure, thermal stability and Brunauer-Emmet-Teller surface area of the synthesized Fe3O4-TiO2 nanoparticles (NPs) are characterized by scanning electron microscope and high-resolution transmission electron microscope, vibrating sample magnetometry, X-ray diffractometer, thermogravimetric analysis and multi point function surface area analyzer. The saturation magnetization of Fe3O4-TiO2 NPs was determined to be 50.97 emu/g, which makes them superparamagnetic. The surface area of Fe3O4-TiO2 NPs was as much as 94.9 m(2)/g. The main factors affecting adsorption efficiency, such as solution pH, reaction time, initial As( V) concentration and adsorbent concentration are investigated. When the adsorption isotherms were analyzed by the Langmuir, Freundlich and Dubinin-Radushkevich models, equilibrium data were found to be well represented by Freundlich isotherm, and adsorption on Fe3O4-TiO2 NPs fitted well with pseudo-second-order kinetic model. The maximum adsorption capacity of As(V) on Fe3O4-TiO2 NPs, calculated by the Freundlich model was determined at 11.434 mu g/g. 1.0 g/L of Fe3O4-TiO2 NPs was efficient for complete removal of 100 mu g/L As(V) in 1 h. Fe3O4-TiO2 NPs was also effective for 93% removal of 100 mu g/L As(III). Matrix effect was determined using As(V)-contaminated well water. Successfull results were obtained for purification of real well water containing 137.12 mu g/L As(V). Results show that Fe3O4-TiO2 NPs are promising adsorbents with an advantage of magnetic separation.
Ultrasound-Assisted Emulsification-Microextraction With In Situ Derivatization and Gas Chromatography-Electron-Capture Detection for Determination of Chlorophenols in Water
(Wiley-Blackwell, 2015) Aydin, Senar; Tor, Ali; Aydin, Mehmet Emin; Beduk, Fatma
A new method, ultrasound-assisted emulsification-microextraction (USAEME) with in situ derivatization and gas chromatography-electron-capture (GC-mu-ECD) detection, was developed to determine selected chlorophenols (CPs), including 2-chlorophenol, 2,6-dichlorophenol, 2,4,5-trichlorophenol, 2,3,4,6-tetrachlorophenol, and pentachlorophenol in water and wastewater samples. Initially the suitable solvent was determined and amount of derivatization reagent (acetic anhydride) and K2CO3, other experimental variables involving extraction and derivatization time, volume of extraction solvent and sample ionic strength, were optimized employing a 2(3) factorial experimental design. The developed method employed 100 mu L of chloroform as extraction solvent, extraction with in situ derivatization for 10 min using 100 mu L of acetic anhydride and 100 mu LK2CO3 (5%, w/v) for 5 mL samples at 25 degrees C with no ionic strength adjustment and centrifugation for 5 min at 4000 rpm. The average relative recoveries under optimum conditions were >97% with relative standard deviation (RSD) <= 5% for three different spiking levels (5, 20, and 100 mu gL(-1)). The limits of detection for studied CPs were in the range of 0.007-0.011mg mu L-1. The developed USAEME with in situ derivatization method was successfully applied to real water samples such as tap, dam water, and domestic wastewater. The developed method showed comparable efficiency with conventional liquid-liquid extraction-derivatization coupled with GC-mu-ECD. The results demonstrated that the developed USAEME with in situ derivatization is simple, fast and reliable for determination of selected CPs in water samples by GC-mu-ECD.
WASTEWATER REUSE IN MIDDLE EAST COUNTRIES - A REVIEW OF PROSPECTS AND CHALLENGES
(Parlar Scientific Publications (P S P), 2016) Bahadir, Mufit; Aydin, Mehmet Emin; Aydin, Senar; Beduk, Fatma; Batarseh, Mufeed
The Middle East Region is one of the driest regions in the world. Water shortage in most of the region has led to wastewater reuse practices. While this source includes valuable nutrients essential for plants, it also contains various environmental contaminants, which can threat both human health and agricultural sustainability. Uncontrolled applications for long term result in soil deterioration, contaminated agricultural products, and sanitary problems. In many Middle East Countries, wastewater treatment plants are lacking. Domestic wastewaters are sometimes contaminated with uncontrolled industrial discharges. Wastewater quality and soil safety for wastewater application are often neglected. For sustainable use of wastewater in the region, there is a serious need for regulations, monitoring of wastewater, soil and product quality, and public awareness about possible adverse effects of untreated wastewater. In this review, the authors aimed to give an overview about the state-of-the-art of wastewater reuse in particular for irrigation purposes in Turkey and the Arab Countries in the Middle East. The different origins of wastewater discharge that are manifold in the Middle East Region, e.g. domestic, touristic, industrial, and agricultural drainage, pollutants identified in the wastewater, and R&D efforts made for a pollution inventory, removal of pollutants through wastewater treatment before use, and the fate and behaviour of the residual pollutants in agro-ecosystems during irrigation with wastewater are reported.

Yazar "Beduk, Fatma" seçeneğine göre listele

Sayfa Başına Sonuç

Sıralama seçenekleri