کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
643671 | 884384 | 2008 | 7 صفحه PDF | دانلود رایگان |
![عکس صفحه اول مقاله: Adsorption of Cu(II), Pb(II) and humic acid on natural zeolite tuff in single and binary systems Adsorption of Cu(II), Pb(II) and humic acid on natural zeolite tuff in single and binary systems](/preview/png/643671.png)
A natural zeolite tuff was used for adsorption of heavy metals, Cu2+ and Pb2+, and humic acid (HA) in aqueous solution. Its adsorptive behaviour was investigated in both single component and binary component systems. For single component system, the adsorption capacities of Cu2+, Pb2+ and humic acid at 30 °C, pH 5 are 23, 68 and 78 mg/g, respectively. Solution pH was found to influence the adsorption. For heavy metals, adsorption is enhanced at higher pH while humic acid adsorption is reduced when solution pH is increased. In Pb2+/humic-acid system, Pb2+ exhibits competitive adsorption with humic acid on the natural zeolite, resulting in reduced adsorption of both Pb2+ and humic acid. However, in Cu2+/humic-acid system, competitive adsorption and complexation between Cu2+ and humic acid influence the adsorption, resulting in decreased adsorption of humic acid but increased adsorption of Cu2+. The complexation structure of Pb–HA/zeolite and Cu–HA/zeolite in three-component system was proposed as S-Pb–HA and S-HA-Cu, respectively.
Journal: Separation and Purification Technology - Volume 62, Issue 1, 1 August 2008, Pages 64–70