ZnO/g-C3N4微纳米材料的制备及其性能研究

Preparation and performance of ZnO/g-C3N4 micro-nano materials

用Zn(NO3)2、ZnCl2、C4H6O4Zn·2H2O及三聚氰胺为原料,采用热解法合成ZnO/g-C3N4复合光催化剂。为了对合成产物的组成、形貌及光吸收性能进行表征,我们利用了X射线衍射(XRD)、扫描电子显微镜(SEM)及UV-Vis等。研究了不同物质含量热解及ZnO的含量对合成产物的影响,并且以六价铬为污染模拟物,对合成的ZnO/g-C3N4进行光催化进行评价。结果表明ZnO/g-C3N4复合材料有更优秀的光催化性能,用氯化锌为2. 5 wt%、热解温度为510℃、保温时间120 min时,合成的ZnO/g-C3N4光催化性能最佳,用氙灯照射270 min后,对六价铬溶液的降解率达到了93. 19%,比用样条件下单一的g-C3N4光催化性能提高了44. 92%。

ZnO doped g-C3N4 composite photocatalyst was synthesized by pyrolysis using Zn( NO3)2,Zn Cl2,C4 H6 O4 Zn·2 H2 O and melamine as raw materials.In order to characterize the composition,morphology and light absorption properties of the synthesized products,we used X-ray diffraction( XRD),scanning electron microscope( SEM),UV-Vis,etc.The effects of doping pyrolysis of different substances and doping amount of ZnO on the synthesized products were studied,and the synthesized ZnO/g-C3N4 was evaluated by photocatalysis with hexavalent chromium as pollution simulant.The results show that the new composite material doped with ZnO has better photocatalytic performance.When zinc chloride is doped with 2. 5 wt%,pyrolysis temperature is 510 ℃,and holding time is 120 min,the synthesized ZnO/g-C3N4 has the best photocatalytic performance.After visible light(λ>420 nm) irradiation for270 min,the degradation rate of hexavalent chromium solution reaches 93. 19%,which is 44. 92% higher than the single g-C3N4 photocatalytic performance under the sample conditions.