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- W2498810132 abstract "The adsorption of thallium(I), lead(II), copper(II), bismuth(III) and chromium(III) by electrolytic manganese dioxide (EMD) has been followed between pH 2–5 [except for bismuth(III)), where a single pH of 1.5 was employed] at 20°C and an ionic strength of 0.5, employing a wide range of initial metal ion concentrations from 5 × 10 −5 mol/dm 3 to 5 × 10 −2 mol/dm 3 . The adsorption isotherms all fitted a simple Langmuir adsorption equation quite well. The amount of metal ion adsorbed increased with pH for lead and copper ion. However, for both thallium and chromium, a significant drop in adsorption between pH 3 and 4 was observed, associated with the dominant presence of lower-charged hydroxy species at higher pH values. At pH 4, adsorption was in the order Pb II > Cu II > TI I >> Cr III , whereas at pH ≤ 2 the order was Bi III ≤ Pb II > Tl I > Cr III > Cu II . In the low pH range, which is largely free of hydrolysis species, the adsorption of the isoelectronic bismuth, lead and thallium series appears to be dominated by charge, and charge appears a dominant factor with the transition metal pair also. The adsorption of lead (at pH 4 and 5) and bismuth (at pH 1.5) to samples of EMD subjected to prolonged heat treatment at 110, 400 and 650°C were also examined. Samples dried at 110°C mainly lost only surface water, and showed adsorption characteristics similar to untreated samples. Samples heated at 400°C lost all their combined water but still showed significant adsorption, whereas samples heated at 600°C were converted to Mn 2 O 3 , and showed very small though measurable metal ion adsorption." @default.
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- W2498810132 date "1996-08-01" @default.
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- W2498810132 title "Adsorption of Thallium(I), Lead(II), Copper(II), Bismuth(III) and Chromium(III) by Electrolytic Manganese Dioxide" @default.
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- W2498810132 doi "https://doi.org/10.1177/026361749601300402" @default.
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