ZnO/BN复合光催化剂的制备与催化活性研究

Preparation of ZnO/BN Composite Photocatalyst and Its Photocatalytic Property under Visible Light

采用原位热解法制备了多孔氮化硼(BN),通过浸渍法将纳米级氧化锌(ZnO)颗粒负载到氮化硼载体表面,制备了可在可见光响应的ZnO/BN复合光催化剂。通过扫描电子显微镜,紫外-可见漫反射光谱和X射线衍射仪表征了其表面形貌、光学活性以及晶体结构。在模拟紫外光及可见光照射的条件下,通过光催化降解有机染料亚甲基蓝的方式,对复合催化剂的催化活性进行评价,结果显示ZnO/BN吸附性能和光催化活性均较高。当模拟紫外光照射60min后,亚甲基蓝的催化降解率达到了92.37%。同时,通过淬灭实验研究了提高光催化活性的机理。

In this paper, porous boron nitride was prepared by in situ pyrolysis, Nano-size ZnO/BN surface-modified ZnO/BN composite photocatalysts(hereafter designated as ZnO/BN) were synthesized by an impregnation method, and probed by XRD, SEM, and UV-Vis DRS. Photocatalytic activities were evaluated using methylene blue as a target pollutant. The results showed ZnO/BN photocatalyst exhibits excellent adsorption and photocatalytic activities under the Ultraviolet. After adsorption equilibrium, the degradation rate of methylene blue can reach 92.37% in 60 min, which attributes to adsorption-photocatalytic synergistic efficiency. At the same time, the mechanism of enhanced photocatalytic activity was discussed by quenching experiments.