ZnO-TiO2光催化还原亚硝酸盐

利用水热法制备了ZnO-TiO2复合材料,采用XRD、SEM、EDS对催化剂进行了表征分析。实验考察了复合材料催化还原亚硝酸盐的效果,结果表明,pH=5,ZnO-TiO2浓度为1.00 g/L,亚硝酸盐初始浓度为50 mg/L(以氮元素计算),0.03 mol/L的甲酸作空穴捕获剂,反应150 min后,亚硝酸盐转化率为94.64%,氮气选择性为79.12%。对光催化亚硝酸盐反应动力学进行研究,拟和出了反应动力学方程,结果表明该催化反应为一级反应。

Photocatalytic reduction of nitrite by ZnO-TiO2 catalyst

ZnO-TiO2 composites photocatalyst was synthesized by hydrothermal method and characterized by X-ray diffraction(XRD), scanning electron microscopy(SEM) and energy dispersive spectrometer(EDS). The experiments investigated the photocatalytic reduction of nitrite. The results indicated that the nitrite conversion reached 94.64% and selectivity for N2 was 79.12% under the condition of pH of 5, catalyst amount of 1.00 g/L, initial nitrite concentration of 50 mg/L(calculated by nitrogen element), formate of 0.03 mol/L as a hole scavenger and reaction time of 150 min.The photocatalytic reaction kinetics were studied, reaction kinetics equation was fitted out, and the result followed first-order kinetics.