含氧空位缺陷钨酸铋光催化产氢性能研究

新型半导体光催化剂钨酸铋是目前研究广泛的光催化剂，但因其电子空穴对易复合的问题，限制了光催化产氢性能。为解决这一问题，采用锂-乙二胺溶液在钨酸铋表面构筑可控氧空位缺陷和金属缺陷。通过材料表征对比了钨酸铋经锂-乙二胺处理前后的变化，并对两者进行了产氢速率测试。钨酸铋在经过锂-乙二胺处理过后产生了氧空位缺陷和降价的金属中心，材料颜色从原先的黄白色转变为黄棕色，增强了光吸收能力。颗粒的主体结构以及物质成分并未发生变化，仍保持花球状颗粒结构，但处理后钨酸铋颗粒表面原先的光滑的片状结构变得粗糙，且方形纳米薄片锋利边缘变光滑，提高了光催化反应面积。这些变化使锂-乙二胺处理后的钨酸铋光催化产氢性能相比未处理之前得到了一定的提升。

Photocatalytic Hydrogen Production Performance of Oxygen-containing Vacancy-deficient Bismuth Tungstate

The novel semiconductor photocatalyst bismuth tungstate is a widely researched photocatalyst, but its photocatalytic hydrogen-producing performance is limited by the problem that its electron-hole pairs are easy to be compounded. To solve this problem, lithium-ethylenediamine solution was used to construct controllable oxygen vacancy defects and metal defects on the surface of bismuth tungstate. The changes of bismuth tungstate before and after lithium-ethylenediamine treatment were compared by material characterization, and both were tested for hydrogen production rate. Bismuth tungstate produced oxygen vacancy defects and metal centers of reduced value after lithium-ethylenediamine treatment, and the color of the material changed from the original yellowish-white to yellowish-brown, which enhanced the light-absorbing ability. The main structure of the particles and the composition of the material did not change, and the spherical particle structure was still maintained, but the original smooth lamellar structure on the surface of the bismuth tungstate particles became rough after the treatment, and the sharp edges of the square nanosheets became smooth, which improved the photocatalytic reaction area. These changes improved the photocatalytic hydrogen production performance of lithium-ethylenediamine-treated bismuth tungstate compared with that of untreated bismuth tungstate.