微波辅助纳米Cu（OH）2/ZnO复合材料的合成与光催化研究

摘要

ZnO and Cu(OH)2 /ZnO composite photocatalyst of different sizes were prepared by using microwave- assisted sol-gel method with Zn(CH3COO)2·2H2O, LiOH·H2O and CuCl2 as raw materials. The prepared samples were characterized by means of XRD, UV-Vis spectroscopy, HR-TEM, IR and SAED, and the photocatalytic performance of different ZnO sizes and dopped copper zinc oxide catalyst were studied by using ultraviolet lamp (15 W) and visible light as illumination device and reactive brilliant blue X-BR as stimulant pollutant. The results indicate that, the sizes of ZnO synthesized at 50℃ for 10 min is the smallest (2.59 nm), and the photocatalysis activity is the best. The photocatalystic degradation of X-bR solution with selected pollutant (Reactive brilliant blue 4) concentration of 40 mg×L-1 could reach 78%under UV for 100 min. The prepared Cu(OH)2/ZnO with the copper to zine mass ratio of 3:7 has the best dispersity and less agglomeration. Using it to photocatalystic degradation of X-BR solution with reactive brilliant blue 4 concentration of 40 mg×L-1, the photocatalystic degradation can reach 84%when the degradation temperature is 120℃.%以乙酸锌、氢氧化锂、氯化铜为原料，采用微波辅助加热溶胶-凝胶法制备了不同尺寸的ZnO和Cu(OH)2/ZnO复合型光催化剂，并用XRD、UV-Vis、HR-TEM、IR和SAED对其进行了表征。采用15 W的紫外灯和室外可见光作为光源，活性艳蓝X-BR为光催化反应模型污染物，研究了在各种不同制备条件下ZnO以及Cu(OH)2/ZnO的光催化性能。实验结果表明，在温度50℃下反应10 min，所合成的ZnO粒径最小，为2.59 nm，蓝移现象最明显，说明其光催化活性最佳。在紫外光下，对浓度为40 mg×L-1的活性艳蓝X-BR溶液进行光催化降解，当降解时间为100 min时，光降解率可达到78%。所制备的Cu(OH)2/ZnO (铜锌质量比3：7)复合材料其分散性最好，团聚现象最小。对浓度为40 mg×L-1的活性艳蓝X-BR溶液进行光化学降解，当降解温度为120℃时，光降解率可达到84%。