Removal of Chromium (Cr3+) and (Cr6+) from Aqueous Solutions Using Leonardite

آب و فاضلاب

Behnam Dovlati¹  Hosein Pirkharrati Pirkharrati²  Ehsan Naderi³  Khalil Farhadi⁴ 

[1] Assist. Prof., Department of Soil Science, Faculty of Agriculture, Urmia University, Urmia, Iran;Assoc. Prof., Department of Geology, Urmia University, Urmia, Iran;Former Graduate Student, Department of Geology, Urmia University, Urmia, Iran;Prof., Department of Chemistry, Faculty of Sciences, Urmia University, Urmia, Iran;

关键词: Leonardite;    Chromium;    Kinetics;    Ion Interfering’s;   

DOI  :  10.22093/wwj.2018.106527.2546

来源: DOAJ

【 摘 要 】

The presence of chromium in drinking water and the entry of industrial wastewater into groundwater resources endangers human health and the environment. This study was done to investigate the effect of leonardite to remove Cr⁺⁶, Cr⁺³ from aqueous environments. The optimal values of factors were determined by the surface response model and the central composite design. Adsorption data were fitted with the pseudo-first order and pseudo-second order kinetic models. In addition, the effects of interfering cations and anions on chromium adsorption were determined. The results showed that the contact time, amount of leonardite and pH significantly affect chromium sorption. Chromium kinetic data were well fitted (R²=0.995) to the pseudo second order equation. The capacity (qe) and adsorption coefficient (Kads) parameters for Cr³⁺ were higher than Cr⁶⁺. As a large amount of Cr³⁺ was adsorbed by leonardite in a short time. Fe³⁺ and SO₄^2- as interfering ions reduced the removal of Cr³⁺ and Cr⁶⁺ by leonardite respectively. It is concluded that Leonardite, as a biodegradable adsorbent, is suitable for remove of chromium from contaminated waters.

【 授权许可】

Unknown