Abstract: Polyoxomolybdate[Mo₃₆O₁₁₀(NO)₄(H₂O)₁₄]·52H₂O was synthesized by a simple one-pot procedure through reducing an acidified mixture of Na₂MoO₄·2H₂O and NH₂OH·HCl. In order to create a heterogeneous catalyst system, the polyoxomolybdate was pillared with MgAl-LDH-NO₃ by direct ion exchange. These novel materials were carefully analyzed by various chemico-physical methods. The catalytic degradation of methylene blue (MB) and rhodamine B (RB) as common dyes in the presence of MgAl-LDH-1 nanoparticles with aqueous hydrogen peroxide, H₂O₂, as an oxidizing agent was studied in aqueous solution at room temperature. More importantly, the catalyst can be recovered and reused efficiently up to five consecutive cycles with negligible loss of catalytic activity.

Key words: Nanocluster, Polyoxomolybdate, LDH, Methylene blue, Rhodamine B

摘要： Polyoxomolybdate[Mo₃₆O₁₁₀(NO)₄(H₂O)₁₄]·52H₂O was synthesized by a simple one-pot procedure through reducing an acidified mixture of Na₂MoO₄·2H₂O and NH₂OH·HCl. In order to create a heterogeneous catalyst system, the polyoxomolybdate was pillared with MgAl-LDH-NO₃ by direct ion exchange. These novel materials were carefully analyzed by various chemico-physical methods. The catalytic degradation of methylene blue (MB) and rhodamine B (RB) as common dyes in the presence of MgAl-LDH-1 nanoparticles with aqueous hydrogen peroxide, H₂O₂, as an oxidizing agent was studied in aqueous solution at room temperature. More importantly, the catalyst can be recovered and reused efficiently up to five consecutive cycles with negligible loss of catalytic activity.

关键词: Nanocluster, Polyoxomolybdate, LDH, Methylene blue, Rhodamine B