Removal Of Lead From Waste Waters By Usıng Walnut Shell

Thesis Type: Postgraduate

Institution Of The Thesis: Gazi Üniversitesi, Fen Bilimleri Enstitüsü, Turkey

Approval Date: 2017

Student: CANAN GÜL

Consultant: İRFAN AR


This study contains removal of Pb(II), which is one of the most harmful heavy metals, by adsorption on modified walnut shell in a batch system. 1000 mg/L Pb(NO3)2 solution was prepared as adsorbate solution, and walnut shell was selected as adsorbent because it is a low cost biomass source and available in large quantities in Turkey. The effects of particle size, adsorban treatment, solution pH, temperature, adsorban dose and initial concentration of Pb(II) ions on removal efficiency were studied. As a result of these experiments, optimum removal efficiency was obtained as 99,88% by using 3 g 250 μm particles treated with 1,0 M NaOH under the experimental conditions of 300 mg/L initial Pb(II) concentration, pH=4,5 and at T=40 °C. Experimental data obtained in this study best fits with Freundlich isotherm. As a result of thermodynamic analysis of the experimental data, thermodynamic parameters were calculated as ΔG = -16,22 kJ.mol-1, ΔH = 20,07 kJ.mol-1, ΔS = 116,86 J.mol-1K-1. Small value of heat of adsorption implies that removal of lead by using walnut shell is a physical adsorption. In consequence of kinetic analysis, the process complied with pseudo-second order and activation energy was calculated as 820 J/mol.