Isotherm and Kinetic Studies on Adsorption of Pb, Zn and Cu by Kaolinite

Caspian Journal of Environmental Sciences

卷:9

关键词: Kinetic;    Kaolinite;    Heavy metal ions;    Batch technique;    Adsorption;   

DOI  :  

来源: DOAJ

【 摘 要 】

The feasibility of kaolinite used as a low-cost adsorbent for the removal of Pb(II), Zn(II) and Cu(II) fromaqueous solutions was investigated. During the removal process, batch technique was used, and theeffects of heavy metal concentration and contact time on adsorption efficiency at pH of 4.5, under aconstant temperature of 20±1 °C were studied. The experimental results were analyzed using fouradsorption isotherm models; Freundlich, Langmuir, Temkin and Redlich-Peterson. Evaluating thecorrelation coefficients showed that the Redlich-Peterson isotherm described the data appropriable thanothers. The adsorption capacities (qm) from the Langmuir isotherm for Pb(II), Zn(II) and Cu(II) are foundas 7.75 mg/g, 4.95 mg/g and 4.42 mg/g respectively. The effectiveness of kaolinite in the sorption of thethree metals from aqueous system was Pb(II) > Zn(II) > Cu(II). Kinetic studies showed that a pseudosecond order model was more suitable than the pseudo first order model. It is concluded that kaolinite canbe used as an effective adsorbent for removing Pb(II), Zn(II) and Cu(II) from aqueous solutions.

【 授权许可】

Unknown