Yazar "Cifci, Deniz Izlen" seçeneğine göre listele

Listeleniyor 1 - 9 / 9
  • Küçük Resim Yok
    Öğe
    Adsorption of Methylene Blue using Bottom Ash: Experimental Design, Isotherm Analysis, and Optimum Conditions
    (Global Network Environmental Science & Technology, 2024) Cifci, Deniz Izlen; Cihan, Mehmet Timur; Gunes, Elcin; Ozturk, Tuba; Gunes, Yalcin
    This study investigated the removal of methylene blue (MB) via adsorption using waste bottom ash. The bottom ash, sourced from a waste storage site in the & Ccedil;orlu district of Tekirda & gbreve; province, Thrace Region, was utilized as the adsorbent. The research examined the impact of several variables on MB removal, including bottom ash dosage, pH, contact time, and agitation speed. It was found that all parameters had a single-variable effect, while pH exhibited a quadratic effect on MB removal in a model- based analysis. The optimization of the model for maximum MB removal identified the optimal conditions as 0.978 g bottom ash dosage, pH 3, 15 minutes of adsorption time, and 50 rpm agitation speed. Under these conditions, the model predicted an MB removal efficiency of 71%, which was experimentally confirmed to be 72.5%. The adsorption process was found to fit with the Freundlich isotherm, indicating a multilayer adsorption mechanism on the heterogeneous surface of the adsorbent. This research not only highlights the feasibility of using bottom ash from coal combustion as an economical adsorbent for dye-contaminated wastewater but also underscores its potential to inform and inspire future studies on waste recycling and wastewater treatment.
  • Küçük Resim Yok
    Öğe
    Biodegradability enhancement and sequential treatment of real chemical industry wastewater by chemical coagulation and Electro-Fenton processes
    (Elsevier Science Sa, 2023) Guvenc, Senem Yazici; Can-Guven, Emine; Cifci, Deniz Izlen; Varank, Gamze
    A sequential treatment with chemical coagulation in the first step and Electro-Fenton (EF) in the second step was applied to chemical industry wastewater. By coagulation using Poly Aluminum Chloride (PAC) as a coagulant, 57.5% chemical oxygen demand (COD), 96.8% total suspended solids (TSS), and 90.5% color index (CI) removal were obtained. In the EF process applied after chemical coagulation, the design parameters were optimized by the central composite design. Two quadratic models of the four factors were established with the COD and CI as two responses. Optimized conditions of the EF were pH 2.5, Fe2+ dose 5 mM, applied current 1 A, and reaction time 60 min. Under these conditions, the COD removal from the validation experiments was 63.5%. In total, 84.5% COD removal was achieved with the two-step treatment. By extending the reaction time in EF to ensure the discharge limits, 89.5% COD removal was reached, and the COD concentration decreased to 193 mg/L after 240 min. At the same time, the 5-day biochemical oxygen demand (BOD5)/COD ratio increased from 0.1 to 0.57 after 240 min. Consequently, the discharge limit was provided and the biodegradability was improved.
  • Küçük Resim Yok
    Öğe
    Comparison of coagulation-Fenton oxidation and coagulation-adsorption processes in textile and chemical industry mixed wastewater
    (Wiley, 2025) Enfiyeci, Aysun; Cifci, Deniz Izlen
    BACKGROUNDIn this study, the treatment of mixed wastewater from textile and chemical industries using coagulation followed by Fenton oxidation or adsorption processes was investigated. In the coagulation process, the effects of pH and coagulant dosage were examined using polyaluminium chloride, FeCl3 and alum. The effects of Fe2+ and H2O2 concentrations, pH and oxidation time on Fenton oxidation of coagulated mixed industrial wastewater were also investigated. In the adsorption process, the effects of pH, adsorbent dosage and adsorption time were evaluated using coconut-based activated carbon (Coconut-AC) and coal-based activated carbon (Coal-AC).RESULTSIn coagulation, 68.5% chemical oxygen demand (COD), 63.1% total organic carbon (TOC) and 94.3% color removal were achieved with FeCl3 at pH 5 and a coagulant dose of 600 mg L-1. Coagulation-Fenton oxidation resulted in 95.7% COD, 84.1% TOC and 99.0% color removal with 1500 mg L-1 Fe2+ and 6000 mg L-1 H2O2 at pH 3. In the coagulation-adsorption process, 97.5% COD, 95.5% TOC and 99.5% color removal were obtained using Coconut-AC with an adsorbent dosage of 40 g L-1 at pH 3, while 92.3% COD, 82.4% TOC and 99.2% color removal were obtained with Coal-AC at pH 3 and an adsorbent dosage of 30 g L-1.CONCLUSIONEffective treatment of mixed industrial wastewater from the textile and chemical industries can be achieved more quickly using Coconut-AC for adsorption following coagulation. Conversely, the same removal efficiencies can be reached over a longer duration with Fenton oxidation after coagulation. (c) 2024 Society of Chemical Industry (SCI).
  • Küçük Resim Yok
    Öğe
    Effect of chromophore type on efficiency of reactive dye removal using polyamidoamine dendrimer
    (Wiley, 2024) Atav, Riza; Akkus, Eray; Cifci, Deniz Izlen; Ergunay, Ugur; Gunes, Yalcin; Gunes, Elcin
    In this study, by selecting a sample of dyes from a wide variety of chromophores used in the production of reactive dyes (monoazo, bisazo, metal azo, phthalocyanine, anthraquinone, copper formazan and triphendioxazine), the colour removal performance of polyamidoamine (PAMAM) dendrimer in reactive dyes was statistically evaluated depending on the dye chromophore groups (and accordingly molecular weight and number of sulfo groups of the dye), dendrimer concentration and centrifugation time. When all the results were examined, it was observed that the colour removal efficiency was significantly lower in metalazo and copper formazan-based reactive dyes, whereas colour removals ranging from 93% to 98% could be obtained in bisazo, triphendioxazine, monoazo, anthraquinone and phthalocyanine dyes. With the use of dendrimer, the best colour removal efficiencies occurred at pH 3. However, it was found that the centrifugation time of 15 min is sufficient for all dyes, and a longer centrifugation does not provide any additional benefit in terms of colour removal.
  • Küçük Resim Yok
    Öğe
    Efficient removal of paracetamol, diclofenac sodium, and tetracycline using green synthesized Fe-zn co-doped sunflower seed shells
    (Taylor & Francis Inc, 2025) Cifci, Deniz Izlen
    In this study, carbon material obtained from sunflower seed shells and doped with Fe and Zn using mint extract (Fe-Zn-SSSC) was prepared, and the usability of this adsorbent in the removal of paracetamol, diclofenac sodium, and tetracycline was investigated. Fe-Zn-SSSC was characterized by SEM-EDX and FTIR. Additionally, the effects of pH and adsorbent dosage on the removal of paracetamol, diclofenac sodium, and tetracycline were investigated. The removal rates of paracetamol, diclofenac sodium, and tetracycline were obtained as 88.7%, 65.4%, and 76.0% at a pH of 4, after 1 hour of adsorption with 5 g/L Fe-Zn-SSSC, respectively. The best removal of paracetamol, diclofenac sodium, and tetracycline was obtained at pH 4, with qmax values calculated as 14.51 mg/g, 6.33 mg/g, and 8.99 mg/g, respectively. It was determined that the adsorption of paracetamol, diclofenac sodium, and tetracycline with Fe-Zn-SSSC was more compatible with the Langmuir isotherm model and pseudo-second-order kinetic model. As a result, this study demonstrates that carbon materials synthesized from sunflower seed shells can serve as an effective and low-cost adsorbent for drug from water.
  • Küçük Resim Yok
    Öğe
    Preparation of PVA-Cotton Fiber-Carbonyl Iron Composite Film for the Removal of Tetracycline from Water
    (Korean Fiber Soc, 2025) Kaplica, Zeynep; Safak, Serife; Cifci, Deniz Izlen
    As the use of antibiotics such as tetracyclines has increased, their presence in water has also risen, making their removal from water sources increasingly important. In this study, a film containing polyvinyl alcohol (PVA), cotton fiber, and carbonyl iron (PVA-CF/CI) was prepared, and its use as an adsorbent material for removing tetracycline from water was investigated. The characterization of the PVA-CF/CI film was carried out using SEM-EDAX and FTIR analyses. It was observed that the addition of carbonyl iron to the PVA film significantly increased tetracycline removal. The adsorption kinetic of tetracycline was found to follow pseudo-second-order model, and the adsorption isotherm model was best described by the Langmuir isotherm model. Tetracycline removal reached 90.8% at pH 3 and 1 g film dose. The qmax obtained with the PVA-CF/CI film containing carbonyl iron was 3.8 times higher than that obtained with the PVA film alone. As a result, while the addition of cotton to the films was not significantly effective, the addition of carbonyl iron was found to significantly enhance tetracycline removal. Additionally, it is possible to produce a more economical and less toxic film polymer by using PVA, cotton, and carbonyl iron.
  • Küçük Resim Yok
    Öğe
    Process characterization and pretreatment of container and drum cleaning industry wastewater using a heat-activated persulfate oxidation process
    (Wiley, 2023) Gunes, Elcin; Cifci, Deniz Izlen; Celik, Suna Ozden
    The aim of this study was to treat wastewater from washing, cutting or crushing of intermediate bulk containers (IBCs), steel drums and plastic drums, using the sulfate radical-based oxidation method. In this study, it was planned to make the wastewater suitable for activated sludge treatment by applying neutralization after a sulfate radical-based oxidation process. Samples were taken from the industry three times to study these treatment processes. To determine the optimum conditions in the study, chemical oxygen demand (COD), removal efficiency was calculated, and optimum temperature, optimum time, and optimum persulfate dose were determined. Since the washing is done with hot water in the industry, the thermal activation method was used for the activation of persulfate. In the results of the study, COD removal efficiency, and total organic carbon (TOC), biochemical oxygen demand (BOD), total nitrogen (TN), total phosphorus (TP), and potentially toxic metal(s) removal efficiency was measured in three wastewater samples. According to the results of the study, the temperature at which the best COD removal efficiency was observed was 70 degrees C, the COD/S2O82- ratio was 1:2, and the contact time was 5 h. As a result of the study, it has been revealed that such wastewater can be given to the activated sludge after sulfate radical-based oxidation and neutralization in the same existing reactor instead of the existing FeCl3 process.
  • Küçük Resim Yok
    Öğe
    REMOVAL OF HUMIC ACID FROM WATER BY PHYSICO-CHEMICAL METHODS AND ADVANCED OXIDATION PROCESSES AND COUPLED WITH COST ANALYSIS
    (Gh Asachi Technical Univ Iasi, 2024) Gunes, Yalcin; Gundag, Ozgun; Ozturk, Tuba; Kaykioglu, Gul; Cifci, Deniz Izlen
    In this study, various methods for humic acid (HA) removal from water, including physico-chemical methods (adsorption, coagulation-flocculation) and advanced oxidation processes (ozone oxidation, Fenton oxidation and photocatalytic oxidation), were investigated along with a comparative economic analysis. The results showed that adsorption using 2 g/L powdered activated carbon demonstrated promising results with a removal efficiency of 96% at pH 4. Coagulation-flocculation with FeCl3 (40 mg/L) and Al2(SO4)3 (40 mg/L) at pH 5 showed HA removal rates of 94% and 93%, respectively, with FeCl3 proving to be more efficient. Fenton oxidation resulted in a removal efficiency of 95% at pH 4, with 60 min of oxidation and optimal doses of 80 mg/L Fe2+ and 120 mg/L H2O2. Ozone oxidation achieved a lower removal efficiency of 81% at pH 10, and its high cost makes it less favorable. Photocatalytic oxidation with UV-A and UV-C light, combined with 300 mg/L TiO2 catalyst, exhibited the highest removal efficiency of 99% within 30 minutes. However, its high cost limits its practical application. Cost analysis revealed that physicochemical methods like adsorption and coagulation-flocculation are not only effective but also economical for HA removal. As a result, while advanced oxidation processes offer high removal efficiency, they come with significant costs. Physico-chemical methods remain viable options for HA removal, providing both efficiency and cost-effectiveness. However, careful consideration of disposal costs for waste materials generated during these processes is essential for a comprehensive cost analysis.
  • Küçük Resim Yok
    Öğe
    Treatment of Leather Industry Wastewater Using Coagulation, Ultraviolet/Persulfate Processing and Nanofiltration for Water Recovery
    (Pleiades Publishing Inc, 2024) Dincer, Ali Riza; Cifci, Deniz Izlen; Karaca, Feriha
    This study investigated water recovery with the treatment of leather industry processes wastewater (washing, pickling, and degreasing units) using coagulation, ultraviolet/persulfate (UV/PS) treatment, and nanofiltration processes. Coagulation studies were carried out using alum as the coagulant, and the highest chemical oxygen demand (COD) removal efficiency was obtained at pH 7 for all the wastewater. The highest COD and total organic carbon (TOC) removal were 80.9 and 50.5% in the wastewater washing unit (S2O82-: 8 g/L, pH 7) and 76.5 and 96.1% in the wastewater degreasing unit (S2O82-: 16 g/L, pH 6) using UV/PS oxidation, respectively. High COD and TOC removal could not be achieved with UV/PS oxidation in the wastewater pickling unit. In the studies performed with NP030 nanofiltration membrane after UV/PS oxidation, the highest permeability and COD removal was achieved at pH 7 under 4 x 10(5) Pa pressure in wastewater washing and degreasing units. After 75 min of nanofiltration at pH 7 in washing and degreasing units, the total filtrate amount was 39.8 and 42.3 L/m(2) h, respectively. COD concentration in the wastewater washing unit decreased from 4434 to 138 mg/L, while it decreased from 5833 to 212 mg/L in the wastewater degreasing unit with coagulation, UV/PS processing, and nanofiltration. As a result, the treatment of leather industry wastewater through separate streams with coagulation, UV/PS, and nanofiltration, washing, and degreasing unit wastewater provides very high COD removal. Also, it has been shown impossible to treat the pickling unit wastewater by UV/PS oxidation.