水热合成Bi<sub>2</sub>WO<sub>6</sub>/SC光催化剂及其光催化脱硝性能研究

水热合成Bi₂WO₆/SC光催化剂及其光催化脱硝性能研究

摘要: 以活性半焦(SC)为载体,采用水热法合成新型可见光催化剂Bi₂WO₆ /SC, 利用SEM、BET、XRD、FT-IR和紫外可见漫反射(UV-vis)光谱等系列手段对所制备的样品进行了表征,并以可见光(λ＞ 400 nm)为光源,模拟烟气中的NO为氧化脱除对象,进行光催化活性测试。结果表明,通过水热法合成的Bi₂WO₆具有微米花形状,且光响应波长已扩展到400 nm以上的可见光区, Bi₂WO₆/SC光催化脱硝剂性能最好,反应4 h后脱硝率仍高于70%。

Abstract: A novel Bi₂WO₆/SC photo-catalyst was synthesized by hydrothermal method with semi-coke (SC) as the support. The as-prepared catalyst was characterized by SEM, BET, XRD, FT-IR and UV-vis diffuse reflectance spectra; its photo-catalytic activity in NO oxidation under visible light irradiation (λ> 400 nm) was evaluated. The results indicate that Bi₂WO₆ obtained by hydrothermal method displays micro-flower structure and absorption spectrum toward the visible light region above 400 nm. The Bi₂WO₆/SC catalyst exhibits excellent photo-catalytic activity in NO removal; NO conversion remains higher than 70% after reaction under irradiation for 4 h.