【摘要】 以Bi（NO₃）₃·5H₂O和ZnCl₂为原料,采用700℃高温固相煅烧的方法制备了能响应于太阳光的Bi₃₈ZnO₅₈光催化纳米材料。XRD物相分析表明,该样品为立方晶系结构。SEM和TEM形貌观察发现,该催化剂基本为粒径约100 nm的球形颗粒,且分散性较好。用紫外可见漫反射（UV-Vis）对该光催化剂的光吸收特性进行测定,禁带宽度约为2．13 eV,在紫外光区和可见光区均有较强的光吸收特性。粗略计算Bi₃₈ZnO₅₈光催化剂的价带顶的电势电位约为2．6 eV,表明了该光催化剂具有很强的氧化能力。以12 mg/L的亚甲基兰溶液作为被降解物质,以太阳光为光源研究了Bi₃₈ZnO₅₈光催化剂的光催化活性。测试结果表明．其对亚甲基兰溶液具有较强的光催化降解性能,4 h可将亚甲基兰近乎完全催化降解。此光催化剂可循环使用,循环使用5次后,Bi₃₈ZnO₅₈样品的晶体结构基本未变,光催化效率仍保持在98％以上。更多还原

【Abstract】 Bi₃₈ZnO₅₈,a photocatalyst responsive to the sunlight,was successfully synthesized by means of solid state reaction method at 700℃,and Bi（NO₃）₃·5H₂O and ZnCl₂ were used as the reactants.The cubic crystal structure of the photocatalyst was determined by means of XRD.SEM and TEM indicated that Bi₃₈ZnO₅₈ were spherical particles with good dispersity and the average diameter was ca.100 nm.The photo- absorption property and band gap of the photoeatalyst were determined by UV-Vis diffuse reflectance spectrum, from which it could be seen that the band energy of the photocatalyst was ca.2.13 eV,and that Bi₃₈ZnO₅₈ possessed much strong photo-absorption property both in the ultraviolet and visible light regions.The edge position of the VB of the photocatalyst was calculated roughly as ca.2.6 eV,which demonstrated that the photocatalyst had a much strong oxidative activity.The photocatalytie activity of Bi₃₈ZnO₅₈ was tested on 12 mg/L methylene blue solution under sunlight illumination.The test results showed that methylene blue was nearly completely degraded after 4 h,which confirmed the high photocatalytic activity of the photocatalyst. Moreover,the crystal structure of Bi₃₈ZnO₅₈ was still the same and its photocatalytic efficiency of Bi₃₈ZnO₅₈ was still above 98% even after being reused for five times.更多还原