Akın, Deniz
Yakar, Arzu
Gündüz, Ufuk
Dyes, which are used in different industries such as paper, plastics, leather, pharmaceutical, food, cosmetics, textiles, etc., constitute a major class of environmental pollutants. In recent studies, magnetic adsorbents combining magnetic separation technology with the adsorption process has been used to remove dyes from industrial wastewaters. The main advantages of the adsorbents are possible to be easily and simply separated from process media in a short time using the external magnetic field and will be reused. In present work, desorption behavior of the dye adsorbed particles was investigated. For this purpose, magnetic polymeric particles were used as adsorbents and Bromothymol Blue (BB) selected as an anionic dye. In order to determine the desorption pattern of the anionic dye from the magnetic polymeric particles, the particles were suspended in phosphate-buffered saline solution and maintained at 150 rpm. At predetermined time intervals, the samples were removed and the amount of desorbed BB was analyzed with a UV-vis spectrophotometer. The desorption kinetics and equilibrium of BB from the particles with time in pH 7.4 and 5 phosphate buffer solutions have clearly shown that the desorption of BB is affected by the characteristics (nano/micro) of the particles and there are significant differences in the desorption profiles between pH values.
Proceedings of the 14th International Conference on Environmental Science and Technology (3-5 September 2015)


Numerical investigation of the viscoelastic fluids
Yapıcı, Kerim; Uludağ, Yusuf; Department of Chemical Engineering (2008)
Most materials used in many industries such as plastic, food, pharmaceuticals, electronics, dye, etc. exhibit viscoelastic properties under their processing or flow conditions. Due to the elasticity of such materials, deformation-stress in addition to their hydrodynamic behavior differ from simple Newtonian fluids in many important respects. Rod climbing, siphoning, secondary flows are all common examples to how a viscoelastic fluid can exhibit quite distinctive flow behavior than a Newtonian fluid would do...
The Effect of dispersed phase feed rate on the production of pickering emulsions
Dönmez, Dila; Ayrancı Tansık, İnci; Department of Chemical Engineering (2018)
Emulsions are fundamental in many applications such as food, petroleum, detergent, pharmaceutical and cosmetic industries. Pickering emulsions are defined as emulsions of any type, either oil-in water, water-in-oil or even multiple, stabilized by solid particles instead of surfactants. Solid particles may prevent the droplets from coalescing by getting adsorbed at the interface, and thus stabilizing the emulsion. Pickering emulsions have more advantages over emulsions stabilized by surfactants in terms of s...
Treatability and toxicity of nonylphenol compounds in anaerobic batch reactors
Bozkurt, Hande; Sanin, Faika Dilek; Department of Environmental Engineering (2011)
Nonylphenol (NP) and its ethoxylates are used in formulation of pesticides and detergents, production of personal care products and many industrial sectors such as textile, metal plating, plastic, paper and energy. They are also used in the formulation of household cleaning agents. Industrial uses in the production line make up 55% of the total use; whereas industrial and domestic cleaning processes constitute 30 and 15%, respectively. Since they are widely used in industry and households, NP compounds ente...
Laboratory investigation of the treatment of chromium contaminated groundwater with iron-based permeable reactive barriers
Uyuşur, Burcu; Ünlü, Kahraman; Department of Environmental Engineering (2006)
Chromium is a common groundwater pollutant originating from industrial processes such as metal plating, leather tanning and pigment manufacturing. Permeable reactive barriers (PRBs) have proven to be viable and cost-effective systems for remediation of chromium contaminated groundwater at many sites. The purpose of this research presented in this thesis is to focus on two parameters that affect the performance of PRB on chromium removal, namely the concentration of reactive media and groundwater flux by ana...
Preparation of antimicrobial films from agricultural biomass
Seber, Ayşe Gizem; Bakır, Ufuk; Department of Biotechnology (2010)
Mainly used food packaging materials are petro-chemical based polymers which present environmental problems since they are not biodegradable and ecologically sustainable. In this study, biodegradable biofilms are produced from xylan, extracted from cotton stalk which is an agricultural biowaste without nutritional value. Antimicrobial property was given to the biofilms with either titanium dioxide sol-gel coatings or titanium dioxide powder addition into the biofilm forming solutions. The antimicrobial acti...
Citation Formats
D. Akın, A. Yakar, and U. Gündüz, “INVESTIGATION OF DESORPTION KINETICS AND EQUILIBRIUM OF AN ANIONIC DYE FROM MAGNETIC POLYMER ADSORBENTS,” presented at the Proceedings of the 14th International Conference on Environmental Science and Technology (3-5 September 2015), Rhodes, Greece, 2015, Accessed: 00, 2021. [Online]. Available: