聚合络合法制备可见光响应光催化剂K_4Ce_2Nb_(10)O_(30)及其光解水活性

Preparation of Visible Light-driven Photocatalyst K_4Ce_2Nb_(10)O_(30) by Polymerizable Complex Process and Its Photocatalytical Activity for Water Decomposition

以可溶性的草酸铌为前体,通过聚合络合法合成了可见光响应光催化剂K4Ce2Nb10O30.XRD、SEM、BET以及UV-Vis等表征结果表明:通过该法制备的光催化剂相对于传统高温固相反应法制备的样品具有更小(20～50nm)且分布均匀的纳米颗粒和较高的比表面积.在可见光下(λ>400 nm)分解水的活性测试中,聚合络合法获得K4Ce2Nb10O30比高温固相样品具有更高的光催化分解水活性,并且在紫外光段下(λ>300 nm)具备了完全分解纯水的光催化活性.

Visible light-driven photocatalyst K4Ce2Nb10O30 was prepared by polymerizable complex （PC） process using dissolvable niobium oxalate as precursor. Characterizations of XRD, BET, SEM and UV-Vis showed that the sample prepared from PC process presented smaller particles （20-50 nm） and higher specific surface areas than the sample from conventional high temperature solid state reaction （SSR） method. As for their photocatalytical activi ties for water decomposition under visible light irradiation （λ〉 400 nm）, the sample prepared by PC method showed higher H2 evolution activities than that of sample prepared by SSR as a result of the higher surface areas and finer crystal particles of sample prepared by PC. Moreover, the sample prepared by PC methods realized the overall pure water splitting under λ 〉 300 nm irradiation condition.