花状锌铬层状双金属氢氧化物的制备及其光催化性能的研究

The Construction of Flower-Shaped ZnCr Layered Double Metal Hydroxide and Photocatalytic Performance

摘要: 光催化技术作为一项绿色可持续的技术，利用光照可以实现水分解产生氢气，降解有机污染物等，对维护地球环境，实现可持续发展具有重大意义。层状双氢氧化物(LDHs)由于其独特的插层结构具有高度分散的金属阳离子，较大的比表面积和出色的吸附能力，而被研究用作光催化剂。本文中，我们通过水热法制备了锌铬比例分别为1:1和2:1的两种片花状LDHs，并测试了其在可见光下降解亚甲基蓝的性能。并尝试通过添加牺牲氧化剂H₂O₂溶液，提升ZnCr-LDHs的性能。单纯的Zn2Cr1-LDHs降解反应进行到390分钟时，亚甲基蓝降解超过95%，加入微量H₂O₂溶液作为牺牲氧化剂后，90分钟可以降解80%以上的亚甲基蓝，加入Zn1Cr1-LDHs和H2O2溶液的亚甲基蓝溶液在30分钟内，降解超过95%。在光催化还原CO2的实验中，Zn1Cr1-LDHs还原6小时，CO的最终产量为0.039 μmol，6小时平均析出速率为0.065 μmol∙g⁻¹∙h⁻¹。

Abstract: As a green and sustainable technology, photocatalytic technology can realize the decomposition of water to produce hydrogen and degrade organic pollutants by using light, which is of great signifi-cance for maintaining the global environment and achieving sustainable development. Layered double hydroxides (LDHs) have been studied as photocatalysts due to their unique intercalation structure with highly dispersed metal cations, large specific surface area, and excellent adsorption capacity. In this paper, we prepared two flower-shaped LDHs with zinc-chromium ratio of 1:1 and 2:1 by hydrothermal method, and tested their performance in degrading methylene blue under visible light. And try to improve the performance of ZnCr-LDHs by adding sacrificial oxidant H₂O₂ solution. When the degradation reaction of Zn2Cr1-LDHs is carried out to 390 minutes, the degra-dation of methylene blue exceeds 95%. After adding a small amount of H2O2 solution as a sacrificial oxidant, it can degrade more than 80% of methylene blue in 90 minutes, the methylene blue solu-tion added with Zn1Cr1-LDHs and H₂O₂ solution degrades by more than 95% within 30 minutes. In the experiment of photocatalytic reduction of CO2, the final output of CO in Zn1Cr1-LDHs within 6 hours was 0.039 μmol, and the average precipitation rate in 6 hours was 0.065 μmol∙g⁻¹∙h⁻¹.

文章引用：易礼彬. 花状锌铬层状双金属氢氧化物的制备及其光催化性能的研究[J]. 材料科学, 2020, 10(7): 540-547. https://doi.org/10.12677/MS.2020.107065

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