光敏性H2[Ag2(W10O32)（BPY）4]复合材料的制备及其光催化氧化环己烷性能研究

Study on the preparation of photosensitive H2[Ag2(W10O32)（BPY）4]composite and its photocatalytic oxidation of cyclohexane

以[(n-C4H9)4N]4[W10O32],AgNO3和4,4’-联吡啶(BPY)为原料,通过水热法合成首例光敏性H2[Ag2(W10O32)(BPY)4]复合材料(命名为AgWBPY),并对其结构、光学性质及非均相光催化氧化环己烷的性能进行了研究.结果表明:光敏性[W10O32]4-多酸阴离子与MOF框架之间的共价键作用,使[W10O32]4-多酸阴离子不易从MOF框架中溶脱,实现了[W10O32]4-多酸阴离子的非均相固载;AgW-BPY的禁带宽度值为2. 30 eV,具有作为光催化剂的潜能;在室温可见光照射下,AgW-BPY对分子氧氧化环己烷生成环己酮和环己醇具有良好的光催化活性,转化效率为76. 1%,经3次循环实验后,转化率仍为74. 5%.

Using[(n-C 4H 9)4N]4[W 10 O 32],AgNO 3 and 4,4′-bipyridine(BPY)as raw materials,the first photosensitive H 2[Ag 2(W 10 O 32)(BPY)4]material was synthesized by hydrothermal method(named AgW-BPY),and its structure,optical properties and performance of heterogeneous photocatalytic oxidation of cyclohexane were studied.The results showed that the covalent bond between the photosensitivity[W 10 O 32]4-polyacid anion and the MOF framework made[W 10 O 32]4-polyacid anion difficult to dissolve from the MOF framework,and the heterogeneous immobilization of anions W 10 O 324-polyacid was successfully realized;AgW-BPY had a band gap value of 2.30 eV,which had the potential as a photocatalyst;under visible light irradiation at room temperature,AgW-BPY had good photocatalytic activity for molecular oxygen oxidize cyclohexane to cyclohexanone and cyclohexan,the conversion efficiency was 76.1%,and the conversion rate was still 74.5%after 3 cycles of experiments.