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0.005 mol Bi(NO3)3and 0.005 mol Fe(NO3)3were dissolved
in diluted HNO3 to form aqueous solutions. Then, the KOH
solution was slowly added to the above solution to coprecipitate
Fe3+ and Bi 3+ ions by constant stirring, and a brown precipitate
was formed. The precipitate was filtered and washed with distilled water to remove NO31
and K1 ions. Then, the precipitate was mixed with 40 mL KOH solution (12M) under constant
magnetic stirring for 5 min. The suspension solution was poured
into a stainless steel Teflon-lined autoclave for the hydrothermal
treatment. The autoclave was sealed, heated up to 200 C and
held for 9 h, and then cooled to room temperature naturally.
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