Abstract
The sorption of Cu2+ ions from aqueous solutions by eggshell was investigated in a batch experimental system with respect to the temperature, initial Cu2+ concentrations, pH, and biosorbent doses. The adsorption equilibrium was well described by the Langmuir isotherm model with the maximum adsorption capacity of 5.05 mg Cu2+/g eggshell at 25 °C. The value of qe increased with increasing the temperature while also increases the release of Ca2+ and HCO−3 ions from the eggshell. The highest sorption of Cu onto the waste eggshell was determined at the initial pH value of 4.0. The results confirming that the adsorption reaction of Cu2+ on the eggshell was thought to be endothermic. A comparison of the kinetic models such as pseudo first and second-order kinetics, intraparticle diffusion, and Elovich on the sorption rate demonstrated that the system was best described by the pseudo second-order kinetic model.
Highlights
Preparation of eggshellThe chicken eggshells were collected from bakeries in Sivas, Turkey
Rium was well described by the Lang4m6uVirainsoetmheurimse mstord.,el5w10it1h4thTeamrtaux,imEusmtonadiasorption capacity of 5.05 mg Cu2+/g eggshell3a,t8I2n5st°Cit.uTteheofvaMlueicorfobqeioinlocgreyasaenddwBitihotinecrhenaosilnoggyth, eUtenmivpeerrsaituyreofwLhialetvailaso, 4inKcrreoasnevsatlhdearbelevads.e, of Ca2+ and HCO–3 ions from the eggshell
The surface of adsorbent characterized by scanning electron microscopy (SEM) was determined in the
Summary
The chicken eggshells were collected from bakeries in Sivas, Turkey. After the eggshells were rinsed several times with tap and distilled water to remove impurities like organics and salts, it was dried at 60 °C for 24 hours in an oven. The eggshells were crushed and screened through a set of sieves to get the size of 106–250 μm
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