Electrocoagulation and nanofiltration integrated process application in purification of bilge water using response surface methodology
Gözmen, Belgin | Dizge, Nadir | Turabik, Meral | Gülsen, H. Elif
Marine pollution has been considered an increasing problem because of the increase in sea transportation day by day. Therefore, a large volume of bilge water which contains petroleum, oil and hydrocarbons in high concentrations is generated from all types of ships. In this study, treatment of bilge water by electrocoagulation/electroflotation and nanofiltration integrated process is investigated as a function of voltage, time, and initial pH with aluminum electrode as both anode and cathode. Moreover, a commercial NF270 flat-sheet membrane was also used for further purification. Box–Behnken design combined with response surface methodology was used to study the response pattern and determine the optimum conditions for maximum chemical oxygen demand (COD) removal and minimum metal ion conte...
Efficient removal of insecticide “imidacloprid” from water by electrochemical advanced oxidation processes
Turabik, Meral | Gözmen, Belgin
The oxidative degradation of imidacloprid (ICP) has been carried out by electrochemical advanced oxidation processes (EAOPs), anodic oxidation, and electro-Fenton, in which hydroxyl radicals are generated electrocatalytically. Carbon-felt cathode and platinum or boron-doped diamond (BDD) anodes were used in electrolysis cell. To determine optimum operating conditions, the effects of applied current and catalyst concentration were investigated. The decay of ICP during the oxidative degradation was well fitted to pseudo-first-order reaction kinetics and absolute rate constant of the oxidation of ICP by hydroxyl radicals was found to be kabs(ICP)=1.23×109 L mol−1 s −1 . The results showed that both anodic oxidation and electro-Fenton process with BDD anode exhibited high minera...
A dual purpose aluminum-based metal organic framework for the removal of chloramphenicol from wastewater
Gözmen, Belgin | Geçgel, Cihan | Görmez, Özkan | Turabik, Meral
The presence of antibiotics in the aquatic environment can cause significant environmental and human health problems even at trace concentrations. Conventional treatment systems alone are ineffective in removing these resistant antibiotics. To address this problem, oxidation and adsorption techniques were used to explore the removal of recalcitrant antibiotic chloramphenicol (CAP). An aluminum-based metal-organic framework (AlMIL) with high surface area and extended porosity, was prepared and used both as adsorbent and catalyst for the oxidation of CAP. Characterization of the Al-MIL revealed a large surface area of 1137 m2 g− 1 , a homogeneous microporous structure, good crystallinity, and particle size in the range of 200–400 nm. Adsorption of CAP on AlMIL achieved equilibrium afte...
Comparison of MIL-101(Fe) and amine-functionalized MIL-101(Fe) as photocatalysts for the removal of imidacloprid in aqueous solution
Gözmen, Belgin | Geçgel, Cihan | Turabik, Meral
One of the attractive iron-based metal organic framework (MOF) MIL-101(Fe) (Material Institute Lavoisier, MIL) and amine-functionalized NH2-MIL-101(Fe) materials were synthesized by conventional solvothermal method and characterized by TGA (Thermo Gravimetric Analysis), SEM (Scanning Electron Microscopy), XRD (X-Ray Diffractograms), BET (Braunner Emmet Teller) and FTIR (Fourier Transform Infrared Spectroscopy). Characterization results indicated that MIL101(Fe) materials have well defined morphology, good thermal stability, high surface area and also high porosity. These MOF materials were used as photocatalysts for photodegradation of a pesticide, imidacloprid (IMC). The response surface methodology (RSM) was applied in designing the IMC photodegradation experiments for evaluating the...
Removal of Basic Textile Dyes in Single and Multi-Dye Solutions by Adsorption: Statistical Optimization and Equilibrium Isotherm Studies
Gözmen, Belgin | Turabik, Meral
The removal of three basic dyes by adsorption onto bentonite was investigated forsingle, binary, and ternary solutions in a batch system. Before and after dye adsorption,bentonite samples were analyzed by using X-ray fluorescence spectrometer, SEM,and Fourier transform IR spectrometry. The D-optimal design and response surfacemethodology were applied in designing the experiments for evaluating the interactiveeffects of each initial concentrations variable of the dyes in binary systems. Predictedvalues were found to be in good agreement with experimental values, which definedpropriety of the model and the achievement of D-optimal in optimization of adsorptionof binary dye systems. The competitive adsorption results showed that the adsorptionamount of a dye was suppressed in the presence and i...
Facile synthesis of micro and nano sized iron based metal organic frameworks for optimization of effective metronidazole removal
Belgin Gözmen | Meral Turabik
The widespread application of antibiotics has led to pollution of aquatic systems with long-lasting pharmaceutical residues that pose serious environmental hazards and encourage antibiotic resistance. Metronidazole (MNZ), which belongs to the class of nitroimidazoles used widely, can commonly be traced to occur in water bodies as it possesses high persistence in the environment. To address this issue, this study reports the synthesis of micro and nano sized MIL-101(Fe) metal-organic frameworks (MOFs), or mMIL-101(Fe) and nMIL-101(Fe), by solvothermal and ultrasonic-assisted solvothermal methods, respectively. Comprehensive physicochemical characterization confirmed the successful synthesis of highly porous materials, with mMIL-101(Fe) exhibiting octahedral crystals with average size 2.3 μm...
Photocatalytic degradation of Basic Red 46 and Basic Yellow 28 in single and binary mixture by UV/TiO2/periodate system
Gözmen Belgin | Turabik, Meral
The present study deals with the investigation of photocatalytic degradation and mineralization of C.I. Basic Red 46 (BR46) and C.I. Basic Yellow 28 (BY28) dyes in single and binary solutions as a function of periodate ion concentration (IO4−), irradiation time, initial pH and initial dye concentrations. First order derivative spectrophotometric method was used for to simultaneous analysis of BY28 and BR46 in binary mixtures. Langmuir–Hinshelwood kinetic model was applied to experimental data and apparent reaction rate constant values were calculated. The apparent degradation rate constant values of BR46 were higher than those of BY28 for all experiments in single dye solutions. On the other hand, the significant reductions were observed for the apparent degradation rate constant values of...