Removal of Ni(II) Ions From Aqueous Solutions Using Activated-Carbon Prepared From Olive Stone by ZnCl2 Activation

2009-12-01
UĞURLU, MEHMET
KULA, İBRAHİM
KARAOĞLU, MUHAMMET HAMDİ
Arslan, Yasin
The aim of this study is to remove Ni (II) ions from aqueous solutions by adsorption. Activated-carbon prepared from olive stone (ACOS) was used as adsorbent. Different particle size and concentration of ZnCl2 were studied to optimize adsorbent surface area. Initial concentration, temperature, time, and pH were selected as parameters. According to the experiments results, the equilibrium time, optimum pH, and adsorbent dosage were found 60 min, pH > 6, and 1.0 g/50 mL, respectively. In addition, raw olive stone was used as adsorbents at the same parameters. Nickel removal percentage for ACOS and Raw Olive stone were obtained 95.00% and 38.00% in turn. The kinetic data supports pseudo-second-order model strongly. In addition, the thermodynamic parameters Delta G degrees, Delta H degrees, and Delta S degrees were found -6.185 kJ mol(-1), -10.997 kJ mol(-1), and -15.889 J/mol K, respectively. Scanning electron microscopy (SEM-EDX) technique was employed to observe the surface physical morphology and structural analysis. The resulting activated carbons with 20% ZnCl2 solution was the best sample of the produced activated-carbons from olive stone with the specific surface area of 790.25 m(2)g(-1). The results indicated that ACOS could be employed as an alternative adsorbent for removing Ni (II). (C) 2009 American Institute of Chemical Engineers Environ Prog, 28: 547-557, 2009
ENVIRONMENTAL PROGRESS & SUSTAINABLE ENERGY

Suggestions

Oxidation of Acid Red-151 aqueous solutions by the peroxone process and its kinetic evaluation
Acar, Ebru; Ozbelge, Tulay (Informa UK Limited, 2006-06-01)
Oxidation of an azo dye solution, namely, Acid Red 151 by the peroxone process was investigated experimentally at different pH values, initial dye and ozone concentrations, and the initial molar ratios (r) of hydrogen peroxide to ozone. At pH 2.5 in this process, the obtained color and chemical oxygen demand (COD) removals were higher than those at pH of 7 and 10. The best value of r yielding the highest treatment efficiency at each pH was determined as 0.5. The application of the "initial rates method" to ...
An extracellular - Pepstatin insensitive acid protease produced by Thermoplasma volcanium
Kocabıyık, Semra (Elsevier BV, 2007-01-01)
In this study, some parameters for the production and caseinolytic activity of an extracellular thermostable acid protease from a thermoacidophilic archaeon Thermoplasma volcanium were determined. The highest level of growth and enzyme production were detected at pH 3.0 over an incubation period of 192 h at 60 degrees C. The pH optimum for the acid protease activity was 3.0 and the enzyme was fairly stable over a broad pH range (pH 3.0-8.0). The temperature for maximum activity of the enzyme was 55 degrees ...
Removal of hexavalent chromium anions via polymer enhanced ultrafiltration using a fully ionized polyelectrolyte
HAKTANIR, CEREN; Ozbelge, H. Onder; Bicak, Niyazi; Yılmaz, Levent (Informa UK Limited, 2017-01-01)
A fully ionized polyelectrolyte was synthesized for Cr(VI) removal from aqueous solutions by continuous polymer enhanced ultrafiltration (PEUF). Effect of operating parameters such as pH, loading, polymer, and competing ion concentrations were examined. Highest Cr(VI) retention was obtained at a loading of 0.01 at pH 4. Increasing both polymer and chromate concentrations at a fixed loading of 0.01 decreased the retention which demonstrated the effect of crowding. In the presence of competing anions such as ...
Removal of methylene blue by new tunable aryl/alkyl ionic liquids/salts (TAAILs) from aqueous solution
Özdemir, Melek (Informa UK Limited, 2019-10-16)
The removal of methylene blue (MB) from aqueous solution has been investigated using new tunable 1-aryl-2-alkyl-3,5-dimethylpyrazolium hexafluorophosphate salts ([Ph(R)C(R?)pz][PF6], R: -Cl, -Br, -Me, -OMe, R?: -C2H5, or -C4H9) as an extractant and methylene chloride as a diluent. The influence of p-substituent and alkyl chain length on the removal efficiency of MB from aqueous solution was investigated. The obtained results show that MB was extracted from aqueous solution with high extraction efficiency up...
Pre-ozonation of aqueous azo dye (Acid Red-151) followed by activated sludge process
Gokcen, Fulya; Ozbelge, Tulay A. (Elsevier BV, 2006-10-15)
In this study, the efficiency of the integrated process was investigated in which the pre-ozonation step was followed by activated sludge process (ASP) in treating the aqueous Acid Red-151 (AR 151) solutions. The percent dye removal in the integrated process was found to be 47% for a pre-ozonation time of 30 min, instead of 25% in the singly ASP without pre-ozonation. The treatment efficiency of this process could be higher if the pre-ozonation time of 120 min yielding maximum enhancement of biodegradabilit...
Citation Formats
M. UĞURLU, İ. KULA, M. H. KARAOĞLU, and Y. Arslan, “Removal of Ni(II) Ions From Aqueous Solutions Using Activated-Carbon Prepared From Olive Stone by ZnCl2 Activation,” ENVIRONMENTAL PROGRESS & SUSTAINABLE ENERGY, pp. 547–557, 2009, Accessed: 00, 2020. [Online]. Available: https://hdl.handle.net/11511/67644.