Development of Fe-Al mixed oxide for arsenic removal : comparative study with single metal oxides

Development of Fe-Al mixed oxide for arsenic removal : comparative study with single metal oxides
홍혜진Wasif Farooq양중석양지원
adsorption; arsenic,; iron-aluminum binary oxide; metal oxide; pH effect
Issue Date
Sixteenth symposium on separation science and technology for energy applications
Arsenic is a serious concern due to its toxicity even at low concentration. Iron oxide is widely used to arsenic adsorbent. To enhance the arsenic adsorption capacity, aluminum oxide is blended with iron oxide in this study(Fe-Al binary oxide). Aluminum oxide exhibits extremely large surface area that improves dispersion of iron oxide. Fe-Al binary oxide and single metal oxides are synthesized by sol-gel hydrothermal method. Characteristics of synthesized adsorbents are analyzed by SEM-EDAX, XRD and B.E.T analyzer. 71% of Fe- Al binary oxide surface consists of oxygen, Al and Fe take 18 and 10%, respectively. Fe-Al binary oxide exhibits large surface area(87.42 ㎡/g) as compared with iron oxide(34.3 ㎡/g). Fe-Al binary oxide shows 4 times higher arsenic adsorption capacity than the other single metal oxides. It seems that increase of surface area promotes the iron oxide contact with arsenic in the water. Adsorption of arsenic on all adsorbents are well fitted with Langmuir isotherm. Maximum adsorbed mass of As(V) on iron oxide, aluminum oxide and Fe-Al binary oxide are 12.4, 10.8 and 37.6 mg/g, respectively. Increase of pH lower the As(V) adsorption. Fe-Al binary oxide shows much higher As(V) adsorption capacity than single metal oxides over all pH except pH 2 and 13. Different from As(V), As(III) adsorption increased with pH. Fe-Al binary oxide efficiently adsorb the As(III) at high pH(>8).
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