https://hdl.handle.net/20.500.12619/3355 Mon, 13 Apr 2026 16:20:31 GMT 2026-04-13T16:20:31Z https://hdl.handle.net/20.500.12619/45023 A Batch Adsorber Design for Rhodium Adsorption on Gallic Acid Formaldehyde Resin Bulut, Emrah The adsorption of rhodium (III) ions onto gallic acid formaldehyde resin in a batch adsorber has been studied. Adsorption experiments were carried out by agitating 1 g resin particles with 1000 ml of Rh (III) ion solution of the initial concentrations from 16.54 to 88.80 mg/l (293K, 1M HCl). Using Langmuir isotherm, a single stage batch adsorber was designed for different adsorbent mass/treated effluent volume ratios. An initial rhodium concentration of 100 g/m(3) is assumed and the required amount of resin particles to recover metal ion content by 75%-99% at various volumes of effluents. For a single-stage adsorption system, thus the adsorbent demonstrated recovery capacity. For example, 1 m(3) of solution is to be treated; the required masses of gallic acid resol resin are 25 kg for 75% rhodium removal. In order to recover 90% of the rhodium (III) at various volumes of solution which having different metal concentrations, the required amount of gallic acid resin was calculated. For example, 1 m3 of solution is to be treated, the required amounts of resin particles to reduce the rhodium content by 90% increased from 75 to 76 kg with increase in the initial rhodium metal concentration from 0.1 to 100 g/m(3). Through such a projection, a real single stage adsorption system can be designed. Thu, 01 Jan 2015 00:00:00 GMT https://hdl.handle.net/20.500.12619/45023 2015-01-01T00:00:00Z https://hdl.handle.net/20.500.12619/44863 BIOSORPTION OF CATIONIC DYES FROM AQUEOUS SOLUTION BY WATER HYACINTH ROOTS Teker, Murat Water hyacinth Eichhomia crassipes was found to have biosorption capacity for cationic dyes, malachite green and methylene blue from aqueous solutions. To evaluate the biosorption capacity and characteristics, the effect of solution pH, initial dye concentration, temperature, dose of biosorbent loading, contact time and shaking rate were investigated in a batch mode. Biosorption was increased with the increasing temperature for both studied dyes. The Langmuir and Freundlich adsorption models were used for mathematical description of the sorption equilibrium. Equilibrium data was fitted well to the Langmuir model in the studied concentrations (1-200 mg L-1) at 293 and 313 K. Based on the Langmuir isotherm plots the maximum biosorption capacity values were calculated to be 44.64 mg g(-1) for malachite green and 42.55 mg g(-1) for methylene blue at 313 K. Various thermodynamic parameters such as Delta G degrees, Delta H degrees, and Delta S degrees were evaluated with results indicating that this system was an endothermic spontaneous reaction and kinetically suited to pseudo-second-order model. Sun, 01 Jan 2012 00:00:00 GMT https://hdl.handle.net/20.500.12619/44863 2012-01-01T00:00:00Z https://hdl.handle.net/20.500.12619/5808 AIP Conference Proceedings Ahmet Okatan; Eyüpoğlu, Volkan; Kumbasar, Recep Ali; Halil Ibrahim Turgut In this study, we investigated the selective and the synergistic cobalt extraction from acidic aqueous solutions by solvent extraction using tri-iso-octylamine (TIOA) and Tri-n-octyl phosphine oxide (TOPO) as carriers. The effective parameters on the extraction and the stripping of the cobalt were investigated, and optimum synergistic extraction and stripping conditions were identified. The cobalt extraction from aqueous Co/Ni solutions in various molar concentrations was examined in the optimum conditions to determine the synergism between TIOA and TOPO. Fri, 01 Jan 2016 00:00:00 GMT https://hdl.handle.net/20.500.12619/5808 2016-01-01T00:00:00Z