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When the precipitation was completed, nitrogen was allowed to pass for another 3 min, and the system was undisturbed and heated to 90¡ãC for 24 h in a Teflon
autoclave. Aging time was fixed at 24 h in order to reach conditions near equilibrium. At this point, the solution was cooled at room temperature with an ice bath, and the solid was separated by magnetic decantation and washed several times with distilled water.ÎÒû˵Çå³þ£¬Ó¦¸ÃÊÇÔÚ±£Î½áÊøºóÓñùÔ¡ÀäÈ´°É£¬ÎÒÒ²ÈÏΪÊÇÀäÈ´ºóÔÙ±ùԡûÓô¦ÁË
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