氧化锌纳米线的制备及其光催化性能探究

Preparation of zinc oxide nanowires and their photocatalytic properties

利用Zn(NO3)2水解,六次甲基四胺为辅碱,通过一步水热法合成ZnO纳米线。自然光照射120 min,样品对难降解的甲基橙催化降解率为53.9%,在模拟太阳光(450 W汞灯)照射下,120 min后样品对亚甲基蓝和罗丹明的降解率分别可达76.7%和82.1%,且对较难降解的甲基橙的降解率为68.4%,可见该法合成的样品对有机物具有较好的光催化活性。样品经多次循环利用,其光催化活性变化不大,说明该法合成的样品有较稳定的光催化性能。而且,用一步水热法合成ZnO纳米线,具有设备简单、环境友好、高效等优点。

ZnO nanowires were synthesized by one-step hydrothermal method using Zn(NO3)2 hydrolysis and hexamethylenetetramine as auxiliary alkali.After 120 min of natural light irradiation,the catalytic degradation rate of methyl orange was 53.9%.Under the simulated sunlight(450 W mercury lamp),the degradation rate of methylene blue and rhodamine was up to 76.7% and 82.1% after 120 min.The degradation rate of methyl orange is up to 68.4%.Obviously the sample synthesized by the method has good photocatalytic activity for organic matter.The sample has been recycled for many times,and its photocatalytic activity does not change much,indicating that the sample synthesized by this method has relatively stable photocatalytic performance.Moreover,the synthesis of ZnO nanowires by one-step hydrothermal method has the advantages of simple equipment,environmental friendliness and high efficiency.