| 摘要: |
| 目的 甲醛是大气污染物之一,严重危害身体健康,不仅会刺激眼、鼻、皮肤、粘膜,还容易诱发白血病和癌
症。 催化氧化法具有能耗低、无二次污染、降解效率高等优点,具有极大的应用潜力。 δ-MnO2 催化剂具有优异的
催化降解甲醛性能,但其稳定性仍需进一步提高。 方法 本文以 KMnO4 为前驱体,采用简单的氧化还原法制备了
δ-MnO2 ,探究了在双还原剂条件下,不同还原剂对 δ -MnO2 催化氧化甲醛性能的影响。 利用 XRD、SEM、TEM、
XPS、EPR 等表征技术对不同双还原剂条件下的 δ-MnO2 晶体结构、形貌与物理化学性质进行分析。 结果 研究结
果表明:不同双还原剂条件可明显影响 δ -MnO2 催化氧化甲醛性能,其中,以异丙醇和甲醇为双还原剂制备的
MnO2
-MET 催化剂表现出最优异的催化性能,在室温条件下,甲醛降解率可达 95%,且反应 1 200 min 后甲醛降解
率仍达 80%。 结论 MnO2
-MET 表面高含量的氧空位促进了甲醛的降解。 |
| 关键词: 双还原剂 室温催化氧化 甲醛 氧空位 |
| DOI： |
| 分类号: |
| 基金项目: |
|
| Modulation of Oxygen Vacancies in δ-MnO2 by Double Reducing Agents and Its Catalytic Oxidation Performancefor Formaldehyde |
|
LUO Xiao ai FANG Ruimei
|
|
School of Environment and Resources Chongqing Technology and Business University Chongqing 400067 China
|
| Abstract: |
| Objective Formaldehyde is one of the atmospheric pollutants seriously endangering human health. It not only
irritates the eyes nose skin and mucous membranes but also easily induces leukemia and cancer. The catalytic oxidation
method has the advantages of low energy consumption no secondary pollution and high degradation efficiency presenting great
application potential. The δ-MnO2
catalyst has excellent catalytic performance for formaldehyde degradation yet its stability still
needs further improvement. Methods δ-MnO2 was prepared by a simple redox method with KMnO4
as the precursor. The effects
of different reducing agents under the condition of double reducing agents on the catalytic oxidation performance of δ-MnO2
for
formaldehyde were explored. Characterization techniques such as XRD SEM TEM XPS and EPR were used to analyze the
crystal structure morphology and physicochemical properties of δ-MnO2 under different double reducing agent conditions.
Results The research results indicated that different double reducing agent conditions could significantly affect the catalytic
oxidation performance of δ-MnO2
for formaldehyde. Among them the MnO2
-MET catalyst prepared with isopropanol and
methanol as double reducing agents showed the most outstanding catalytic performance. At room temperature the formaldehyde
degradation rate could reach 95% and it still remained at 80% after 1 200 minutes of reaction. Conclusion The high content
of oxygen vacancies on the surface of MnO2
-MET facilitates the degradation of formaldehyde. |
| Key words: δ-MnO2
double reducing agents room temperature catalytic oxidation formaldehyde oxygen vacancy |
