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采用简单的类微乳化学沉淀法获得了有效复合的BiOBr-TiO2纳米材料.该合成方法的关键在于Br-的双重作用.Br-既作为“桥”将十六烷基三甲基溴化铵(CTAB)中CTA+与TiO2粒子相连,构筑了稳定的油包水的类微乳体系.同时,它又作为BiOBr的溴源有助于纳米复合材料异质结的形成.与纯TiO2和传统的水相化学沉淀法获得的BiOBr-TiO2复合样品相比,采用类微乳化学沉淀法获得的复合光催化剂表现出高的光生电荷分离效率,相应地显示出优异的光催化降解气相乙醛和液相苯酚的性能,这主要与BiOBr和TiO2粒子之间异质结的有效构筑有关.
A simple microemulsion chemical precipitation method was used to obtain an effective composite BiOBr-TiO2 nanomaterials. The key to this synthesis method is the dual role of Br- .Br- both as a “bridge” will cetyl trimethyl bromide In CTAB, CTA + is linked with TiO2 particles to form a stable water-in-oil microemulsion system, and at the same time, it acts as a bromine source of BiOBr to help the formation of heterojunction of nanocomposites. Compared with the BiOBr-TiO2 composite sample obtained by the conventional aqueous chemical precipitation method, the composite photocatalyst obtained by the microemulsion chemical precipitation method shows high photoionization charge separation efficiency and correspondingly shows excellent photocatalytic degradation of vapor phase acetaldehyde And the performance of liquid phenol, which is mainly related to the effective construction of heterojunctions between BiOBr and TiO2 particles.