纳米MnOx负载纸的制备及其甲醛去除性能的研究

Preparation of Nano MnOx-loaded Paper via in Situ Synthesis and Its Performance for Formaldehyde Removal

关键词:  甲醛  纳米MnOx  原位合成  催化氧化  可见光催化氧化

Key Words:formaldehyde  nano MnOx  in situ synthesis  catalytic oxidation  visible light photocatalytic oxidation

摘要:采用原位合成法制备了纳米MnOx负载纸，并对其甲醛去除性能进行了研究。纳米MnOx负载纸的甲醛去除性能与纳米MnOx颗粒的沉积率之间有一定的相关性。当KMnO4浓度为0.1 mol/L、无水乙醇用量为60 mL、反应温度和反应时间为25 ℃和2 h时，可制备出甲醛去除性能最优的纳米MnOx负载纸。扫描电子显微镜观察表明，纸浆纤维的表面沉积了纳米MnOx颗粒。X射线光电子能谱仪（XPS）分析进一步揭示了锰氧化物的生成。纳米MnOx负载纸对甲醛的去除以催化氧化为主、可见光催化氧化为辅。纳米MnOx负载纸在无光条件下仍可对甲醛进行有效去除。

Abstract:Nano MnOx-loaded paper was prepared via in situ synthesis process，and its performance for formaldehyde removal was studied.The performance for formaldehyde removal of nano MnOx-loaded paper had some correlation with the deposition ratio of nano MnOx particles. When the concentration of potassium permanganate （KMnO4） was 0.1mol/L， the volume of absolute ethanol was 60 mL， reaction temperature was 25 ℃ and reaction time was 2 h， the nano MnOx-loaded paper with the optimal performance for formaldehyde removal could be prepared. SEM observation indicated that nano MnOx particles were deposited on the surface of pulp fibers. The FT-IR results showed that the in situ deposition of nano MnOx particles did not change the chemical structure of cellulose. The XPS analysis further revealed the generation of MnOx . Formaldehyde was removed by the nano MnOx-loaded paper mainly via catalytic oxidation and partly via visible light photocatalytic oxidation.Formaldehyde could be effectively removed by the nano MnOx-loaded paper in dark environment.