Lead(II) and copper(II) remove from aqueous solution by adsorption onto egshells and to determine optimum conditions

It was determined that according to industrial development, environmental problems hard to stop day by day. Increasing of heavy metal ration at different kinds of indusrial facilities as metal and chemical using cause to search new treatment technic, cheap and accessible materials. The purpose of this study is to investigate feasibility of lead (II) and copper (II) adsorption on eggshells from aqueous solution. The surface morphology of eggshell was observed with a scanning electron microscopy (SEM) and the pore size distribution (PSD). It was determined that eggshell, pore structure is not effective, has formed high calsium carbonate ratio according to FT-IR spectrophotometer measurement. Batch mode adsorption experiments were carried out to assess the adsorption behavior of lead (II) and copper (II) in aqueous solution as to be parametric. After determined the retantial time, one of the parameter changing was fixed when others are constant. Besides, initial consantrations were changed to find each ions? isotherms. Both of the ions were suitable with Freundlich isotherm. The influence of threeprocess variables, namely, adsorbent dosage (g adsorbent per 0,05 L metal solution), solution pH, and temperature, on the removal of lead (II) and copper (II) were also examined, using a response surface methodological (RSM) approach. The Box-Wilson model was used for maximized and a statistically second-order polynomial equation was fitted to the model exhibiting a response-variable relationship. The optimum conditions for maximum adsorption of lead (II) were found to be as follows: adsorbent concentration of 1 g per 0,05 L of metal solution, pH 6,0, and temperature of 20 C. Maximum adsorption capacity of copper (II) and lead (II) were found to be as 2,87 mg lead (II)/g and 2,26 mg copper (II)/g of adsorbent. The optimum conditions are determined as following; adsorbent concentration of 1,0 g per 0,05 L of metal solution, pH 10,0, and temperature of 18,5 C.