Browsing by Author "Gulnaz, Osman"

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Citation Count: 2
HEAVY METAL REMOVAL BY USING DRIED ENTEROMORPHA COMPRESSA MACRO ALGAE FROM AQUEOUS SOLUTION AND INDUSTRIAL WASTEWATER APPLICATION
(Parlar Scientific Publications (p S P), 2013) Sahmurova, Aida; Turkmenler, Harun; Gulnaz, Osman
In this study adsorption of Zn (II) ions from aqueous solution was studied using Enteromorpha Compressa (EC) as an adsorbent. The FT-IR analysis results shows that EC biomass have several metal binding functional groups such as carboxyl and hydroxyl groups. The zero point of charge of the biomass was determined as pH 5.56 +/- 0.2. The optimum adsorption pH was determined at pH 6 and maximum adsorption capacity (Q(max)) of EC was determined as 625 mgg(-1). Adsorption capacity of biomass was increased with increase of the initial metal concentrations, however increasing the particle size range of biomass decreased the Zn (II) adsorption capacity. The pseudo second-order model well described the adsorption of Zn (II) on EC. The general using and efficiency of EC to treatment of industrial wastewater was tested. EC biomass effectively removed metal ions from industrial wastewater. contain 0.186 mgL(-1) of Cd, 0.034 mgL(-1) of Cu, 0.16 mgL(-1) of Zn ions. The the Chemical Oxygen Demand (COD) of industrial wastewater reduced after adsorption experiment from 886 to 729 mgL(-1) for sample 1 at pH 6.
Citation Count: 64
Removal of Reactive Red 198 from aqueous solution by Potamogeton crispus
(Elsevier Science Sa, 2011) Gulnaz, Osman; Sahmurova, Aida; Kama, Suayip
Native, acid and alkali pretreated dried Potamogeton crispus (P. crispus) was used for adsorption of Reactive Red 198 from aqueous solution. Effects of physicochemical environment on adsorption were investigated. The surface charge of the native, acid and alkali treated biomass were determined to be zero at pH 4.6, 3.8 and 4.1 +/- 0.1, respectively. Adsorption capacity of native biomass was increased with alkali treatment against native and acid pretreated biomass. The maximum adsorption capacities (q(max)) at 20 degrees C of native. acid and alkali pretreated biomass were determined as 14.3, 26.8 and 44.2 mg g(-1), respectively. FT-IR analysis shows that P. crispus has many functional groups such as COO, S=O, C-N, N-H. These functional groups can react with dye molecule in solution. Pseudo-second-order and intraparticle diffusion kinetic models are applicable adsorption of RR198 by P. crispus since adsorption of RR198 is complex and involves more than one mechanism. (C) 2011 Elsevier B.V. All rights reserved.