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In recent years, the removal of heavy metals from water by using low-cost agricultural waste activities were accelerated. Removal of dissolved Cr(VI) and Cu(II) heavy metals in water by olive pomace which olive oil industry waste was investigated. The parameters that affect the heavy metal adsorption such as pH (2-6), contact time (2-120 min.), and initial heavy metal concentrations (5-100 mg/L) were studied in batch experiments at a temperature of 20oC, 0.5 g adsorbent dose and, particle size of between 0.5 and 2.0 mm. The maximum removal efficiencies were obtained 98.8% and 93.2% for Cr(VI) and Cu(II), respectively by using activated olive pomace (AP), at a pH 4, contact time of 15 min. and initial heavy metal concentration of 5 mg/L. The maximum adsorption capacity was determined 0.988 and 0.932 mg/g onto AP for Cr(VI) and Cu(II), respectively. Following this preliminary study, the same optimum conditions were applied to the battery industry wastewater and high removal efficiency was obtained. Moreover, kinetic and isotherm studies were carried out by applying pseudo second order kinetic and Langmuir isotherm model, observing good agreement between theoretical and experimental results at the optimum operation conditions. Various active functional groups were identified by FTIR analysis and SEM images showed that the AP has a porous structure. The study results show that AP has proven its suitability for use in various fields as a low-cost adsorbent in adsorption. [ABSTRACT FROM AUTHOR]

In this study, it was investigated batch adsorption of Reactive Blue 221 which is a textile dye with pumice stone. pH, shaking time, shaking rate, adsorbent particle size and amount were selected as constant parameters but solution temperatures and dye concentrations were selected as variables. Adsorption capacities were determined as 36.60 mg/g ve 47.90 mg/g ve 54.20 mg/g for pumice stone at 293 K, 318 K and 333 K temperatures respectively, in the 7.0 pH, 0.59 mm particle size, 2.00 g adsorbent amount and approximately 1.5 hours shaking time for 8x10-4 M dye concentration. Adsorption data were good agreement with Langmuir isotherm and adsorption was an endothermic and spontaneous process in the results of thermodynamic parameters. The kinetic data of the sorption showed that the pseudo second- order equation was the more appropriate and it was not only obtained an economic process with using of environmentally friendly, easily finded and low cost adsorbent and but also high color removal was obtained in dye. [ABSTRACT FROM AUTHOR]