Novel N/Carbon Quantum Dot Modified MIL-125(Ti) Composite for Enhanced Visible-Light Photocatalytic Removal of NO,Industrial & Engineering Chemistry Research

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Novel N/Carbon Quantum Dot Modified MIL-125(Ti) Composite for Enhanced Visible-Light Photocatalytic Removal of NO
Industrial & Engineering Chemistry Research ( IF 3.8 ) Pub Date : 2020-03-25 , DOI: 10.1021/acs.iecr.9b06816
Meijuan Chen _{1,

2,

3} , Xiaoyan Wei ₂ , Liaoliao Zhao _{2,

4} , Yu Huang ₂ , Shun-cheng Lee ₅ , Wingkei Ho ₆ , Kehao Chen ₃

Affiliation

Highly efficient and stable photocatalysts were synthesized at room temperature by modifying MIL-125(Ti) with N-doped carbon quantum dots (N/CM(Ti)). The N/CM(Ti) with 2.5 vol % N doped carbon quantum dots (N/CQDs) had the best light absorption and visible-light photocatalytic nitrogen oxide (NO) removal efficiency (approximately 49%). It was found through X-ray photoelectron spectroscopy analysis that a N–Ti–O bond was formed in the 2.5 vol % N/CM(Ti), which is more conducive to charge transfer. Photocurrent and electrochemical impedance data also showed that the carrier separation efficiency of 2.5 vol % N/CM(Ti) was significantly superior to that of MIL-125(Ti). In addition, the Ti^III–Ti^IV of MIL-125(Ti) acts as the active center for photocatalytic removal of NO. Two possible electron migration paths were proposed: electron transfer from N/CQDs to Ti^III–Ti^IV center of MIL-125(Ti) due to the photoinduced electron transfer property of N/CQDs, and absorption of UV light generated from the N/CQDs by the terephthalic acid ligand followed by electron transfer to metal active sites for photocatalytic removal of NO.

中文翻译：

新型N /碳量子点修饰的MIL-125（Ti）复合材料，用于增强可见光对NO的光催化去除

通过用N掺杂的碳量子点（N / CM（Ti））修饰MIL-125（Ti），在室温下合成了高效稳定的光催化剂。具有2.5％（体积）N掺杂碳量子点（N / CQDs）的N / CM（Ti）具有最佳的光吸收和可见光光催化氮氧化物（NO）去除效率（约49％）。通过X射线光电子能谱分析发现，在2.5％（体积）的N / CM（Ti）中形成了N-Ti-O键，这更有利于电荷转移。光电流和电化学阻抗数据还表明，2.5体积％N / CM（Ti）的载流子分离效率显着优于MIL-125（Ti）。此外，Ti ^III –Ti ^IVMIL-125（Ti）的活性中心充当光催化去除NO的活性中心。提出了两种可能的电子迁移路径：由于N / CQDs的光致电子转移特性，电子从N / CQDs转移到MIL-125（Ti）的Ti ^III -Ti ^IV中心，以及吸收N / CQDs产生的UV光。通过对苯二甲酸配体生成CQD，然后电子转移到金属活性位点以光催化去除NO。

更新日期：2020-03-26

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