论文部分内容阅读
以硝酸铬和硝酸铜为原料兼氧化剂,甘氨酸、乙二醇和尿素为还原剂,采用液相燃烧法合成CuCrO2,并将其与n型半导体物质WO3复合后得到的(CuCrO2-WO3)复合催化剂用于光催化产氢实验。通过X射线衍射(XRD)、扫描电子显微镜、紫外–可见漫反射光谱(UV-vis DR)及光催化活性测试,考察了燃烧剂类型和用量对合成CuCrO2的物相组成、微观形貌、吸光性能和光催化性能的影响。结果表明:采用甘氨酸为燃烧剂,且甘氨酸与金属离子的摩尔比为1.4:1的条件下制备的CuCrO2性能较优,其粒径较小,分散均匀;其复合后的催化剂(CuCrO2-WO3)光催化产氢活性较高。探讨了燃烧法合成CuCrO2时物质的转化过程。XRD分析表明,硝酸盐与燃料经剧烈燃烧反应主要得到小颗粒的Cu2O和Cr2O3,后经固相反应制得较为理想的CuCrO2晶体颗粒。
CuCrO2-WO3 composite catalyst obtained by liquid-phase combustion synthesis of CuCrO2 with n-type semiconductor material WO3 was prepared by using chromium nitrate and copper nitrate as raw materials and oxidant, glycine, ethylene glycol and urea as reducing agents Photocatalytic hydrogen production experiments. The phase composition, morphology and absorption of CuCrO2 were investigated by XRD, SEM, UV-vis DR and photocatalytic activity. Effect of performance and photocatalytic performance. The results show that CuCrO2 prepared by using glycine as combustion agent and with a molar ratio of glycine to metal ions of 1.4: 1 has better performance and smaller particle size and uniform dispersion. The CuCrO2- Photocatalytic hydrogen production activity higher. The conversion process of CuCrO2 by combustion method was discussed. XRD analysis showed that the small particles of Cu2O and Cr2O3 were mainly obtained after the intense combustion of nitrate and fuel, and then the ideal CuCrO2 crystal particles were obtained by solid-state reaction.