NDLI: Adsorption of Heavy Metals on Mixed Fe-Al Oxides in the Absence or Presence of Organic Ligands

Content Provider	Springer Nature Link
Author	Violante, Antonio Ricciardella, Mariarosaria Pigna, Massimo
Copyright Year	2003
Abstract	A study was carried out on the adsorption of Co$^{2+}$, Cu$^{2+}$, Pb$^{2+}$, and Zn$^{2+}$ ions on mixed Fe-Al oxides inthe absence or presence of increasing concentrations of oxalate or tartrate. Mixed Fe-Al oxides were prepared by precipitating at pH 5.5 mixtures of Fe and Al ions at initial Fe/Al molar ratios (R) of 0, 1, 2, 4, 10 and ∞ (R0, R1, R2, R4, R10 and R∞).The oxides aged 7 days at 20 °C or 30 days at 50 °C showed different chemical composition and physico-chemical and mineralogical properties. All the mixed Fe-Al oxides showed presence of poorly crystalline materials (ferrihydrite) even after prolonged aging. The heavy metals wereselectively adsorbed on the oxides. For all the precipitates aged7 days at 20 °C, the selectivity sequence wasPb$^{2+}$> Cu$^{2+}$ > Zn$^{2+}$ > Co$^{2+}$, but the pH at which 50% ofeach cation was adsorbed (pH$_{50}$) was different from sample tosample. It was found that usually the greater the amounts of Fe in Fe-Al gels the lower the pH$_{50}$ for each metal, but the adsorption of a heavy metal was not linearly related to Fe content. The pH$_{50}$ usually did not change significantly when the oxides were aged 30 days at 50 °C. Competitive adsorption of Cu and Zn on ferrihydrite (R∞) showed thatCu strongly prevented Zn adsorption even at an initial Zn/Cu molar ratio of 8, whereas Cu sorption was not inhibited. In thepresence of oxalate (OX) or tartrate (TR) (organic ligand/Pb molar ratio (r$_{L}$) from 0 to 7) the quantities of Pb adsorbedon the Fe-Al oxides usually increased with increasing r$_{L}$. The adsorption increase of Pb was particularly high on the oxidesricher in Fe (R4-R∞), but a significant increase was also observed on R0-R2 samples. The adsorption of Pb on the oxides hasbeen influenced not only by the presence and concentration of organic ligands but also by the sequence of addition of Pb and tartrate on the sorbents. It has been ascertained that on each oxide the greater amounts of Pb were adsorbed when tartrate wasadded before Pb and usually according to the following sequence: Tr before Pb > Pb before Tr > Pb + Tr > Pb.
Starting Page	289
Ending Page	306
Page Count	18
File Format	PDF
ISSN	00496979
Journal	Water, Air, and Soil Pollution
Volume Number	145
Issue Number	1-4
e-ISSN	15732932
Language	English
Publisher	Kluwer Academic Publishers
Publisher Date	2003-01-01
Publisher Place	Dordrecht
Access Restriction	One Nation One Subscription (ONOS)
Subject Keyword	Hydrogeology Atmospheric Protection/Air Quality Control/Air Pollution
Content Type	Text
Resource Type	Article
Subject	Ecological Modeling Environmental Chemistry Pollution Environmental Engineering Water Science and Technology

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