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DOI : ,    Vol.11, No.4, 33 ~ 42, 2003
Title
Studies on Removal of As and Se by the Surface Modified Adsorbents
김정배 Kim Jeong Bae
Abstract
Batch adsorption experiments were performed to remove arsenate and selenite with adsorbents(anthracite and sea sand) modified by cetyltrimetylammonium bromide (CTABr). Removal process of arsenate seems to be dependant on the cation exchange capacity(CEC) and specific surface area of adsorbents, pH and concentration of CTABr. The surface impregnation rate of CTABr onto anthracite was 100% at the concentration of 2×10^(-5) M in pH 3-10 and that onto sea sand was only 72% at the concentration of 1×10^(-5) M on the neutural pH ranges. The coating rate increased for both anthracite and sea sand as the ionic strength decreased. The surface stability of the anthracite treated with CTABr indicated that the CTABr was essentially irreversibly bound to the anthracite. CTABr-impregnated anthracite at concentration of 2×10^(-5) M effectively removed arsenate and selenite over 95-98% from aqueous solution. In contrast, sea sand had little affinity to arsenate and selenite.
Key Words
adsorbent, surface impregnation rate, CTABr-impregnated anthracite
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