为解决室内环境中甲醛污染问题,采用温和条件下的氧化还原法制备二氧化锰催化剂,以实现室温条件下对甲醛的催化降解。结果表明,KMnO₄与MnSO₄·H₂O的摩尔比为4∶4时反应得到的二氧化锰(MnO₂-4)催化降解甲醛效果最好。通过对二氧化锰催化剂的降解能力和循环降解性能进行测试发现,其对甲醛的降解能力在300 min以内保持在80%以上,且经过 4次循环后对甲醛的降解能力仍达到67.27%。利用SEM、XRD、XPS、BET等对MnO₂-4表征分析发现,MnO₂-4较高的比表面积及丰富的表面羟基、活性氧等物质使其在催化氧化甲醛过程中,促进了其与甲酸盐等中间产物反应而降解为CO₂和H₂O,进而获得室温降解甲醛的能力。

In order to solve the problem of formaldehyde pollution in indoor environment,manganese dioxide catalysts are prepared through a redox method under mild conditions,and applied to achieve catalytic degradation of formaldehyde under room temperature conditions.It is shown that the best degradation effect of formaldehyde can be achieved over MnO₂-4 catalyst that is obtained when the molar ratio of KMnO₄ to MnSO₄·H₂O is 4∶4.It is found through tests that the MnO₂-4 catalyst has maintained a degradation ability of above 80% to formaldehyde within 300 min,and it can still deliver a 67.27% of degradation to formaldehyde after it has been used for four cycles.It is also found through SEM,XRD,XPS and BET that MnO₂-4 catalyst has a high specific surface area,abundant surface hydroxyl groups and reactive oxygen species and other surface active substances,which contributes its ability to promote formates and other intermediate products to degrade to CO₂ and H₂O,and then shows excellent ability to degrade formaldehyde under room temperature.

周辉(1995-),男,硕士生,研究方向为人造板甲醛释放控制技术,1902380305@qq.com。