鐵摻雜類石墨相氮化碳類芬頓/光催化氧化作用機(jī)制
中國給水排水[ISSN:1000-4062/CN:12-1073/TU] 卷: 第36卷 期數(shù): 2020年第7期 頁碼: 84-88 欄目: 出版日期: 2020-04-01
- Title:
- Mechanism of Iron-doped Graphite-like Carbon Nitride Fenton-like/Photocatalytic Oxidation
- 關(guān)鍵詞:
- 鐵摻雜類石墨相氮化碳; 類芬頓; 光催化氧化; 羅丹明B
- Keywords:
- iron-doped graphite-like carbon nitride; Fenton-like; photocatalytic oxidation; rhodamine B
摘要:- 采用熱聚合法制備并優(yōu)化了不同鐵摻雜比的鐵摻雜類石墨相氮化碳（Fe-g-C3N4）類芬頓光催化劑，鐵元素可完全摻雜進(jìn)入類石墨相氮化碳（g-C3N4）結(jié)構(gòu)中并組成Fe—N配位鍵，最佳的Fe摻雜比為10%（質(zhì)量分?jǐn)?shù)）。Fe-g-C3N4類芬頓/光催化氧化對羅丹明B的降解速率和降解率均遠(yuǎn)高于g-C3N4的，反應(yīng)10 min時降解率已達(dá)到87.9%，反應(yīng)過程中起主要作用的活性基團(tuán)為羥基自由基，超氧自由基和空穴電子也有一定作用。在pH值為3~9范圍內(nèi)，F(xiàn)e-g-C3N4類芬頓/光催化氧化對羅丹明B的降解率均高于90%，大幅度拓寬了適用范圍；H2O2的投加量會顯著影響Fe-g-C3N4類芬頓/光催化氧化的降解效能，H2O2最佳投量范圍為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
-
12:04已群發(fā)
-
昨天 12:01已群發(fā)
-
星期六 00:00已群發(fā)
-
星期五 11:46已群發(fā)
-
星期四 11:04已群發(fā)
-
星期三 15:04已群發(fā)
-
08月03日已群發(fā)
-
