Heavy metal ion-exchange kinetic studies over cellulose acetate Zr(IV) molybdophosphate composite cation-exchanger

Abstract The new clay modified with triazole and triazolium ligands was prepared in this research. These materials were applied as abundant and eco-friendly adsorbents for removal of heavy metal ions such as Pb(II), Co(II) and Zn(II) ions. The adsorption efficiency of these materials was calculated by relevant equations such as Langmuir and Freundlich as well as kinetic studies with pseudo-first-order and pseudo-second-order models. These adsorbents proved to be very active on heavy metal ion adsorption. The characterization of these new materials was carried out by various techniques such as X-ray diffraction, thermogravimetric analysis, scanning electron microscope (SEM), X-ray photoelectron spectroscopy and energy-dispersive X-ray spectroscopy as well as SEM-map analysis. Eventually, the catalytic activity of the adsorbents which treated with heavy metal ion solutions was studied in the reduction of nitroarenes to its corresponding amines. The prepared adsorbent–catalyst materials indicated efficient catalytic activity in the reduction of nitroarenes to amines in ambient conditions. Graphic abstract

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Modeling the Effect of Surface Heterogeneity in Equilibrium of Heavy Metal Ion Biosorption by Using the Ion Exchange Model

Environmental Science & Technology ◽

10.1021/es900949e ◽

2009 ◽

Vol 43 (19) ◽

pp. 7465-7471 ◽

Cited By ~ 34

Author(s):

Wojciech Plazinski ◽

Wladyslaw Rudzinski

Keyword(s):

Heavy Metal ◽

Ion Exchange ◽

Metal Ion ◽

Surface Heterogeneity ◽

Exchange Model ◽

Heavy Metal Ion ◽

Effect Of Surface

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Nanofibrous Membrane of Silk Fibroin/Cellulose Acetate Blend for Heavy Metal Ion Adsorption

Advanced Materials Research ◽

10.4028/www.scientific.net/amr.148-149.1431 ◽

2010 ◽

Vol 148-149 ◽

pp. 1431-1435 ◽

Cited By ~ 2

Author(s):

Wei Tao Zhou ◽

Jian Xin He ◽

Shi Zhong Cui ◽

Wei Dong Gao

Keyword(s):

Heavy Metal ◽

Metal Ions ◽

Cellulose Acetate ◽

Silk Fibroin ◽

Metal Ion ◽

Nanofibrous Membrane ◽

Heavy Metal Ion ◽

Ion Adsorption ◽

Metal Ion Adsorption ◽

Nanofibrous Membranes

Silk fibroin/cellulose acetate blend Nanofibrous membranes were prepared by electro- spinning and their performances were evaluated as a heavy metal ion adsorbent. The electrospun nanofibrous membranes were comprised of randomly oriented ultra-fine fibers of 100-600nm diameters. As a result of field emission electron microscope (FEEM), compared with pure nanofibrous membranes, the anti-felting shrinkage of SF/CA blend nanofibrous membranes with 20% CA content was markedly improved after treatment with 100% ethanol. Metal ion adsorption test was performed with Cu2+ as a model heavy metal ion in a stock solution. The pure SF nanofibrous membranes exhibited high metal ion capacities compared with that pure CA nanofibrous membrane. Especially, the SF/CA blend nanofibrous membranes had an exceptional performance for the adsorption of metal ions, and the maximum milligrams per gram of metal ions adsorbed reached 22.8mg/g for Cu2+. This indicated that SF and CA had synergetic effect.

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