Journal
MATERIALS TRANSACTIONS
Volume 58, Issue 1, Pages 71-75Publisher
JAPAN INST METALS
DOI: 10.2320/matertrans.M2016277
Keywords
iron oxide; aluminum; mixed oxide; arsenate; selenate; removal
Funding
- Korea Institute of Geoscience and Mineral Resources (KIGAM) [GP2015-019, 16-3220]
- Korea Institute of Science and Technology (KIST) [2Z04720]
- Nano-Material Technology Development Program through the National Research Foundation of Korea [2016M3A7B4905619]
- National Research Council of Science & Technology (NST), Republic of Korea [16-3220] Funding Source: Korea Institute of Science & Technology Information (KISTI), National Science & Technology Information Service (NTIS)
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Iron oxide (Fe-oxide) has been widely used in the adsorption of heavy metals from aqueous solution. In this study, we improve the heasy metal adsorption capacity of Fe-oxide by synthesizing its binary oxide with aluminum (Al). In addition, we discuss the effect of characteristic changes caused by Al incorporation on the removal of arsenate (As(V)) and selenate (se(vo). Binary oxides with six different Fe:Al ratios (10:0, 9:1. 7:3, 5:5, 3:7 and 1:9) are synthesized by the sol-gel method, followed by a sintering process. The S EM-EDS result reveals that Fe and Al are homogeneously distributed in the oxides. It is found that the incorporation of Al into Fe-oxide not only provides a high specific surface area (90 similar to 200 m(2)/g, 10 times larger than pure Fe-oxide) but also inhibits the phase transition from alpha-FeOOII to alpha-Fe2O3. The combination of the expanded surface area and the alpha-FeOOH phase, which has a plentiful supply of hydroxyl groups, plays a crucial role in improving As(V) and Se(VI) adsorption. Among various Fe:Al ratio binary oxides, the highest uptake is achieved with 5:5 Fe:Al oxide sintered at 100 degrees C.
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