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The removal of mercury(II) from dilute aqueous solution by activated carbon☆ by C HUANG; D BLANKENSHIP is a Environmental Science article available to read on EtoBox.

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The results of preliminary screening tests comparing the total Hg[I1) removal capacity of I 1 different brands of commercial activated carbon indicated that a very high percent (99-100°,) total Hg removal was attained by all types of activated carbon especially at pH 4-5 ; the percent total Hg{ll) removal decreased with pH's ~4-5 except activated carbons Nuchar SA and SN which maintained a relatively high percent (> 90"o) total Hg(ll) removal capacity at all pH values. Experiments were then conducted to reveal the mechanisms of Hg(II) removal by Nuchar SA (a powdered carbonl. The results show that total HglIl) removal was brought by two mechanisms : the adsorption and reduction. In order to investigate the kinetics of these two reactions, volatilization by bubbling N z gas at high flow rate was used to remove the Hglgl product of the reduction reaction. It was noted that both the adsorptiota and the reduction; volatilization reactions were highly pH-dependent; at pH approx. approx. 9-10 the extent of reduction/volatilization reaction superceded the adsorption reaction: whereas in the mid-pH region adsorption reaction dominated the total Hg(ll) removal. The rate of adsorption reac

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Author

C HUANG; D BLANKENSHIP

Published

1984

Language

EN

Field

Environmental Science (Physical Sciences)