铁掺杂类石墨相氮化碳类芬顿/光催化氧化作用机制
中国给水排水[ISSN:1000-4062/CN:12-1073/TU]
卷:
第36卷
期数:
2020年第7期
页码:
84-88
栏目:
出版日期:
2020-04-01
- Title:
- Mechanism of Iron-doped Graphite-like Carbon Nitride Fenton-like/Photocatalytic Oxidation
- 关键词:
- 铁掺杂类石墨相氮化碳; 类芬顿; 光催化氧化; 罗丹明B
- Keywords:
- iron-doped graphite-like carbon nitride; Fenton-like; photocatalytic oxidation; rhodamine B
- 摘要:
- 采用热聚合法制备并优化了不同铁掺杂比的铁掺杂类石墨相氮化碳（Fe-g-C3N4）类芬顿光催化剂，铁元素可完全掺杂进入类石墨相氮化碳（g-C3N4）结构中并组成Fe—N配位键，最佳的Fe掺杂比为10%（质量分数）。Fe-g-C3N4类芬顿/光催化氧化对罗丹明B的降解速率和降解率均远高于g-C3N4的，反应10 min时降解率已达到87.9%，反应过程中起主要作用的活性基团为羟基自由基，超氧自由基和空穴电子也有一定作用。在pH值为3~9范围内，Fe-g-C3N4类芬顿/光催化氧化对罗丹明B的降解率均高于90%，大幅度拓宽了适用范围；H2O2的投加量会显著影响Fe-g-C3N4类芬顿/光催化氧化的降解效能，H2O2最佳投量范围为1.0~1.5 mmol/L。
- Abstract:
- Iron-doped graphite-like carbon nitride (FegC3N4) Fenton-like photocatalyst was prepared by using thermal polymerization and optimized by adjusting the iron-doped ratios. The optimal iron-doped ratio was 10%, and iron element could be completely doped into the graphite-like carbon nitride (g-C3N4) structure and formed Fe-N coordination bond. The degradation velocity and degradation rate of rhodamine B by Fe-g-C3N4 Fenton-like/photocatalytic oxidation were much higher than those of g-C3N4. The degradation rate of rhodamine B reached up to 87.9% after 10 minutes of reaction. The main active oxygen species were hydroxyl radicals, followed by superoxide radicals and hole electrons. The degradation rate of rhodamine B by Fe-g-C3N4 Fenton-like/photocatalytic oxidation was always more than 90% when the pH was in the range of 3-9, which greatly broadened the scope of application. The dosage of H2O2 greatly influenced the degradation efficiency of Fe-g-C3N4 Fenton-like/photocatalytic oxidation, and its optimal dosage was between 1.0 mmol/L and 1.5 mmol/L.
更新日期/Last Update:
2020-04-01