Removal of Cu(II) from aqueous solutions by using marble waste

In this study, the effects of marble waste dosage, size, mixing speed, temperature, initial metal ion concentration and contact time on the removal of Cu(II) ions from aqueous solutions by marble waste have been investigated through batch experiments. When marble waste was used as an adsorbent removal efficiency of Cu(II) was determined to be 89.2% at 200 rpm stirring speed; optimum dosage of adsorbent was 10 g/L and adsorption efficiency at this dose was determined to be 83.4%. It was found that the experimental kinetic data fit the pseudo second order kinetic model and activation energy for Cu(II) adsorption process were found to be 9.35 kj mol-1. The adsorption equilibrium data for the Cu(II) adsorption process obeyed well for Langmuir isotherm and the maximum adsorption capacity were calculated to be 208.33 mg g-1 for 25°C. Thermodynamic analysis indicated this the Cu(II) adsorption process were endothermic (ΔH° = 12.88 kj mol-1 ) and spontaneous (ΔG° = -8.56 kj mol-1 ).

Mermer atýklarý kullanarak sulu çözeltilerden Cu(II) giderimi

Bu çalýþmada, Cu(II) iyonlarýnýn bir adsorbent olan mermer atýklarý ile sulu çözeltilerden giderimi üzerine, sýcaklýk, Cu(II) konsantrasyonu, adsorbent dozu, boyutu ve karýþtýrma hýzý gibi parametrelerin etkileri temas süresine baðlý olarak incelenmiþtir. Adsorbent olarak kullanýlan mermer atýklarý üzerine bakýrýn sorpsiyonunda 200 devir/dk. karýþtýrma hýzýyla giderim veriminin %89.2 olduðu, uygun adsorbent dozajýnýn 10 g/l olup sorpsiyon veriminin bu dozajda %83.4 deðerine ulaþtýðý belirlenmiþtir. Kinetik verilerin II. dereceden kinetik modele daha iyi uyduðu belirlenmiþtir. Aktivasyon enerjisinin Cu(II) sorpsiyon prosesi için 9.35 kJ/mol olduðu bulunmuþtur. Denge verilerinin Langmuir izotermine uyduðu ve Cu(II) sorpsiyon prosesi için maksimum sorpsiyon kapasitesinin 25 °C’de yaklaþýk 208.33 mg/g olduðu hesaplanmýþtýr. Termodinamik parametreler Cu(II) adsorpsiyonuprosesinin endotermik olduðunu (ΔH°=12.88 kJ/mol) ve kendiliðinden gerçekleþen (ΔG°=-8.56 kJ/mol) karakterde olduðunu göstermiþtir.