Self-assembled monolayers on mesoporous support (SAMMS) technology for contaminant removal and stabilization | Zendy

J. Liu | Zendy; G.E. Fryxell | Zendy; Shas V. Mattigod | Zendy; M. Gong | Zendy; ZhenZhou Nie | Zendy; Xiaming Feng | Zendy; Kenneth N. Raymond | Zendy

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Self-assembled monolayers on mesoporous support (SAMMS) technology for contaminant removal and stabilization

Author(s) -

J. Liu,

G.E. Fryxell,

Shas V. Mattigod,

M. Gong,

ZhenZhou Nie,

Xiaming Feng,

Kenneth N. Raymond

Publication year - 1998

Publication title -

osti oai (u.s. department of energy office of scientific and technical information)

Language(s) - English

Resource type - Reports

DOI - 10.2172/663548

Subject(s) - mercury (programming language) , adsorption , thiol , chemistry , iodide , kinetics , monolayer , inorganic chemistry , nuclear chemistry , organic chemistry , biochemistry , physics , quantum mechanics , computer science , programming language

A study of mercury-adsorption kinetics showed that at all pH values (3, t, 7 and 9), the adsorption by thiol-SAMMS occurred very rapidly ({approximately}82 to 95% of total mercury adsorption occurred within the first 5 min). The adsorption equilibrium in all cases was attained with {approximately}4 h. At fixed solid:solution ratio, the mercury-loading density on thiol-SAMMS increased with decreasing iodide concentrations. The highest mercury loading of {approximately}270 mg/g of thiol-SAMMS was observed at an iodide concentration of {approximately}90 mmoL/L. Calculated free energy of adsorption value showed that Hg{sup 2+} ion has high affinity for thiol-groups. This strong adsorption affinity is typical of soft-cation/soft-base interaction. Very high distribution coefficient values indicated that thiol-SAMMS adsorbs mercury from KI-K{sub 2}SO{sub 4} solutions with very high specificity

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